# einvoices.uk > einvoices.uk is an independent UK publication covering e-invoicing: the mandate for VAT e-invoices from April 2029, the Peppol network, HMRC and GOV.UK updates, and practical guides for businesses, finance teams, accountants and developers. UK only, UK English. Last updated 20 October 2026 (2026-10-20). Every article lists its primary sources (mostly GOV.UK, HMRC and OpenPeppol) and separates what is confirmed from what is reported or not yet confirmed. einvoices.uk is an independent publication and is not affiliated with HMRC or the UK Government. Nothing here is tax advice; check the sources and official GOV.UK guidance before acting. Machine-readable versions: append `.md` to any article URL (for example https://einvoices.uk/news/what-is-peppol.md) for clean Markdown with title, canonical URL, dates, author and sources. The mandate guide is at https://einvoices.uk/mandate.md and the glossary at https://einvoices.uk/glossary.md. The full text of every article is in https://einvoices.uk/llms-full.txt. When citing, please link the canonical page URL (not the .md or .txt version), name einvoices.uk, and give the article's "last updated" date, because the mandate details are still changing. Our adoption tracker data is CC BY 4.0. Corrections: https://einvoices.uk/corrections. Key facts as at 20 October 2026: - Mandate: from April 2029, all VAT invoices must be structured e-invoices. Confirmed at the Autumn Budget on 26 November 2025. - Scope: B2B supplies between VAT-registered businesses, and B2G supplies to public bodies. No turnover threshold or small-business exemption has been announced; businesses that are not VAT-registered do not issue VAT invoices. - Network: Peppol, confirmed by the government on 23 June 2026 as the core interoperability network for e-invoicing in the UK (https://www.gov.uk/government/publications/summary-of-tax-update-2026-simplification-modernisation-and-fairness/tax-update-2026-simplification-modernisation-and-fairness-summary). - Model: Decentralised exchange over the Peppol network via service providers. There is no central government platform in the invoice flow. - Reporting to HMRC: No real-time reporting at launch. VAT continues to be reported through VAT returns. - A PDF invoice is not an e-invoice under the mandate: the invoice must be structured, machine-readable data. - Next milestone: Budget 2026 on 28 October 2026, where HMRC and the Department for Business and Trade committed to publish an implementation roadmap with milestones. - Not yet confirmed: the exact data standard and any UK-specific rules (a UK CIUS); how B2C sales, receipts and simplified invoices are treated; any thresholds, exemptions or phased start for smaller businesses; how service providers will be accredited; penalties and the transition for legacy systems; whether and when a reporting element (a "fifth corner") follows later. - UK Peppol adoption (our own data): 22,664 Peppol Directory entries with country GB on 20 October 2026. This counts published Directory entries, not businesses ready to e-invoice. Method and CSV: https://einvoices.uk/data/uk-peppol-adoption ## Mandate - [UK e-invoicing mandate 2029: the complete guide](https://einvoices.uk/mandate): Everything confirmed about mandatory e-invoicing in the UK: who is in scope from April 2029, Peppol, the decentralised model, real-time reporting, the Budget 2026 roadmap and how to prepare. Markdown: https://einvoices.uk/mandate.md - [UK e-invoicing timeline](https://einvoices.uk/timeline): Every key date from the 2025 consultation to go-live in April 2029, with status and sources. - [Official GOV.UK feed](https://einvoices.uk/updates): Live list of GOV.UK publications that mention e-invoicing or Peppol. - [News](https://einvoices.uk/news): All news, analysis and guides, newest first. - [UK e-invoicing statistics: every figure, sourced](https://einvoices.uk/news/e-invoicing-statistics-uk): Every UK e-invoicing figure we could verify: HMRC's SME survey, Peppol Directory counts, consultation numbers and benefit estimates, with publisher, date, method and link. (published 2026-10-20) - [Budget 2026: five things the e-invoicing roadmap must answer](https://einvoices.uk/news/budget-2026-e-invoicing-roadmap-what-to-watch): HMRC and DBT promised a roadmap for the April 2029 e-invoicing mandate at Budget 2026 on 28 October. These are the questions it needs to settle. (published 2026-10-20) - [HMRC research: only 29% of SMEs say they use e-invoicing](https://einvoices.uk/news/hmrc-sme-e-invoicing-research-findings): HMRC's research into SME e-invoicing found low awareness, heavy reliance on PDFs and email, and a clear call for guidance before the 2029 mandate. (published 2026-10-20) - [Peppol confirmed as the network for UK e-invoicing](https://einvoices.uk/news/peppol-confirmed-uk-e-invoicing-network): The government has confirmed Peppol as the core interoperability network for the UK's 2029 e-invoicing mandate, using a decentralised, four-corner model. (published 2026-10-20) - [E-invoicing to be mandatory for UK VAT invoices from April 2029](https://einvoices.uk/news/uk-mandatory-e-invoicing-april-2029): The Autumn Budget 2025 confirmed that all VAT invoices between UK businesses, and to the public sector, must be e-invoices from April 2029. (published 2026-10-20) - [Do retail receipts need to be e-invoices from 2029?](https://einvoices.uk/news/b2c-receipts-simplified-invoices-e-invoicing): Consumer receipts are not VAT invoices, so they sit outside the mandate's core. Simplified and retailer invoices to business buyers are not yet settled. (published 2026-10-20) - [Clearance vs decentralised e-invoicing: which has the UK chosen?](https://einvoices.uk/news/decentralised-vs-clearance-model): The UK has chosen a decentralised model: invoices go business to business via providers, not through HMRC. Here's how that compares with clearance systems. (published 2026-10-20) - [Benefits of e-invoicing for UK businesses: what is real](https://einvoices.uk/news/e-invoicing-benefits-uk): The real benefits of e-invoicing for UK businesses, from faster payment to fewer errors, what the evidence says, and how to measure the gains yourself. (published 2026-10-20) - [Isle of Man e-invoicing: does the UK 2029 mandate apply?](https://einvoices.uk/news/e-invoicing-isle-of-man): The Isle of Man shares the UK VAT area but has its own VAT law. No Manx e-invoicing mandate has been announced. Here's what is confirmed and what isn't. (published 2026-10-20) - [Jersey, Guernsey and the UK e-invoicing mandate](https://einvoices.uk/news/e-invoicing-jersey-guernsey-channel-islands): The Channel Islands are outside UK VAT, so the UK mandate does not apply there. Here's how it affects UK firms trading with Jersey and Guernsey, and vice versa. (published 2026-10-20) - [12 UK e-invoicing myths, and what's actually true](https://einvoices.uk/news/e-invoicing-myths): No, a PDF won't count, HMRC won't see every invoice in 2029, and there's no government portal. We check common e-invoicing myths against official sources. (published 2026-10-20) - [Northern Ireland e-invoicing: XI VAT numbers and the 2029 mandate](https://einvoices.uk/news/e-invoicing-northern-ireland-xi-vat): Northern Ireland businesses are in scope of the UK's April 2029 mandate. An XI number is the same VAT number with an EU-facing prefix. Open points explained. (published 2026-10-20) - [E-invoicing penalties in the UK: what HMRC could charge](https://einvoices.uk/news/e-invoicing-penalties-uk): No e-invoicing penalties have been announced for the 2029 mandate. Existing VAT penalties for invoices and records still apply. Here's what's known. (published 2026-10-20) - [E-invoicing and the UK VAT gap: what the numbers say](https://einvoices.uk/news/e-invoicing-vat-gap): HMRC puts the 2024 to 2025 VAT gap at 6.6%, or £12.1 billion. Here is how e-invoicing could affect it, and why the UK's no-RTR model limits the effect at first. (published 2026-10-20) - [E-invoicing vs Making Tax Digital: what's the difference?](https://einvoices.uk/news/e-invoicing-vs-making-tax-digital): MTD is about keeping digital VAT records and filing returns through software. E-invoicing, from April 2029, is about how VAT invoices travel between businesses. (published 2026-10-20) - [The four-corner model of e-invoicing explained](https://einvoices.uk/news/four-corner-model-explained): In the four-corner model, supplier and buyer each use their own service provider, and the providers exchange invoices over Peppol. How it works in the UK. (published 2026-10-20) - [A short history of e-invoicing in the UK, from EDI to 2029](https://einvoices.uk/news/history-of-e-invoicing-uk): How UK e-invoicing got here: EDI, the NHS Peppol strategy, public procurement rules, Making Tax Digital, the 2025 consultation and the April 2029 mandate. (published 2026-10-20) - [Who is the UK Peppol Authority? Past, present and 2029](https://einvoices.uk/news/peppol-authority-uk): There is no UK-wide Peppol Authority today. OpenPeppol lists SCCL for England's NHS, and UK providers sign with OpenPeppol. The 2029 role is not yet decided. (published 2026-10-20) - [Will HMRC require real-time reporting of invoices?](https://einvoices.uk/news/real-time-reporting-uk): Not in 2029. The government says real-time reporting won't come with the e-invoicing mandate but may be considered once e-invoicing is well established. (published 2026-10-20) - [UK e-invoicing consultation response: summary of key points](https://einvoices.uk/news/uk-e-invoicing-consultation-2025-summary): What the 2025 HMRC and DBT e-invoicing consultation asked, who replied, and what the November 2025 response decided: 2029 mandate, decentralised, no RTR. (published 2026-10-20) - [What is Peppol? A plain-English guide for UK businesses](https://einvoices.uk/news/what-is-peppol): Peppol is an international network and set of standards for sending e-invoices between businesses. The UK has confirmed it as the core network for 2029. (published 2026-10-20) - [Who is in scope of the UK e-invoicing mandate in 2029?](https://einvoices.uk/news/who-is-in-scope-uk-e-invoicing-mandate): From April 2029 every VAT invoice must be an e-invoice. In practice that means VAT-registered businesses selling to other businesses or the public sector. (published 2026-10-20) ## Guides - [All guides](https://einvoices.uk/guides): Practical guides and explainers for UK businesses. - [E-invoicing client letter template for UK accountants](https://einvoices.uk/news/e-invoicing-client-letter-template-accountants): Free, editable letters to tell clients about the April 2029 e-invoicing mandate: small business, ERP and non-VAT-registered versions, plus a short email. (published 2026-10-20) - [Accounts payable e-invoicing in the UK: a guide for AP teams](https://einvoices.uk/news/accounts-payable-e-invoicing-uk): How UK accounts payable teams should prepare to receive Peppol e-invoices by April 2029: intake, validation, matching, approvals, responses and archiving. (published 2026-10-20) - [Invoicing a government department: e-invoicing rules](https://einvoices.uk/news/central-government-e-invoicing-suppliers): Central government has had to accept EN 16931 e-invoices since April 2019. The rules for suppliers, defence exceptions, devolved rules and what 2029 adds. (published 2026-10-20) - [Does my accounting software support Peppol? How to check](https://einvoices.uk/news/check-accounting-software-peppol-support): How to check whether your UK accounting software supports Peppol e-invoicing: where to look, the questions to ask, red flags and how to test it yourself. (published 2026-10-20) - [Farmers and e-invoicing: flat rate scheme, self-billing and 2029](https://einvoices.uk/news/e-invoicing-agriculture-farmers): How the 2029 e-invoicing mandate meets farming: flat rate scheme invoices, zero-rated produce, and self-billing by processors and auctioneers. (published 2026-10-20) - [Charity e-invoicing: does the 2029 mandate apply to you?](https://einvoices.uk/news/e-invoicing-charities): Whether a charity is caught by UK e-invoicing depends on its VAT position. How the 2029 mandate meets charity reliefs, grants and trading subsidiaries. (published 2026-10-20) - [Construction e-invoicing: CIS, reverse charge and 2029](https://einvoices.uk/news/e-invoicing-construction-cis): How the 2029 e-invoicing mandate meets construction: CIS deductions, the VAT domestic reverse charge, applications for payment and self-billing. (published 2026-10-20) - [How much does e-invoicing cost in the UK? What to budget for](https://einvoices.uk/news/e-invoicing-cost-uk): What UK e-invoicing will cost your business: the cost items to budget for, the factors that drive price, how to compare quotes and why to distrust averages. (published 2026-10-20) - [UK e-invoicing FAQ: 20 questions answered](https://einvoices.uk/news/e-invoicing-faq-uk): Short, sourced answers to the questions UK businesses ask most about e-invoicing: who's in scope, when it starts, Peppol, PDFs, costs, HMRC and what to do now. (published 2026-10-20) - [E-invoicing guide for UK accountants and bookkeepers](https://einvoices.uk/news/e-invoicing-guide-for-accountants): How UK accountants and bookkeepers can prepare clients for the April 2029 e-invoicing mandate: triage, software reviews, data clean-up and new services. (published 2026-10-20) - [Hospitality e-invoicing: hotels, events and the 2029 mandate](https://einvoices.uk/news/e-invoicing-hospitality): Most hospitality sales are B2C and stay outside the 2029 e-invoicing mandate. Corporate stays, events and trade accounts are the parts likely to be caught. (published 2026-10-20) - [Haulage e-invoicing: freight, self-billing and the 2029 mandate](https://einvoices.uk/news/e-invoicing-logistics-haulage): What the April 2029 e-invoicing mandate means for hauliers, couriers and forwarders: freight VAT, self-billed subcontractors and customs disbursements. (published 2026-10-20) - [E-invoicing if you're not VAT registered: what changes in 2029](https://einvoices.uk/news/e-invoicing-non-vat-registered-businesses): Businesses that are not VAT registered are not obliged to e-invoice under the 2029 mandate, but suppliers, customers and Peppol may still affect you. (published 2026-10-20) - [E-invoicing implementation plan for UK finance teams](https://einvoices.uk/news/e-invoicing-project-plan-finance-teams): A phased e-invoicing implementation plan for UK finance teams preparing for April 2029: governance, workstreams, milestones, risks and a go-live checklist. (published 2026-10-20) - [Landlords, option to tax and e-invoicing from 2029](https://einvoices.uk/news/e-invoicing-property-landlords): Commercial landlords who opt to tax issue VAT invoices for rent, so the 2029 mandate is likely to apply. Exempt and residential lettings differ. (published 2026-10-20) - [Wholesale and retail e-invoicing in the UK: what 2029 means](https://einvoices.uk/news/e-invoicing-retail-wholesale): Wholesalers' B2B invoices must be e-invoices from April 2029. Retail receipts to consumers are different. What is confirmed and what is still open. (published 2026-10-20) - [E-invoicing for small businesses in the UK: a plain guide](https://einvoices.uk/news/e-invoicing-small-business-guide): What the 2029 e-invoicing mandate means for UK small businesses: who is affected, what changes day to day, what it may cost and what to do first. (published 2026-10-20) - [Do sole traders need e-invoicing? The 2029 rules explained](https://einvoices.uk/news/e-invoicing-sole-traders-uk): Sole traders who are VAT-registered and invoice business customers will need e-invoicing from April 2029. Unregistered sole traders are not obliged. (published 2026-10-20) - [VAT groups and e-invoicing: how the 2029 mandate applies](https://einvoices.uk/news/e-invoicing-vat-groups): A UK VAT group's invoices to outside customers are VAT invoices and in scope from April 2029. Intra-group supplies are normally disregarded. Here's the detail. (published 2026-10-20) - [How to choose a Peppol Access Point in the UK](https://einvoices.uk/news/how-to-choose-a-peppol-access-point): Check the provider is Peppol-certified, can send and receive BIS Billing 3.0, supports MLS and lets you move your Peppol ID. A practical UK checklist. (published 2026-10-20) - [Invoicing a council electronically: a supplier's guide](https://einvoices.uk/news/local-council-e-invoicing-suppliers): Councils must accept compliant e-invoices on above-threshold contracts. Here is what that means today, how it differs across the UK, and what April 2029 adds. (published 2026-10-20) - [NHS Peppol invoicing: what suppliers need to know](https://einvoices.uk/news/nhs-peppol-e-invoicing-suppliers): Many NHS buyers in England already use Peppol. What applies to NHS suppliers today, and what changes when e-invoicing becomes mandatory in April 2029. (published 2026-10-20) - [How to onboard suppliers to e-invoicing in the UK](https://einvoices.uk/news/supplier-onboarding-e-invoicing): A step-by-step plan for onboarding UK suppliers to Peppol e-invoicing before April 2029: segmentation, communications, data collection, testing and follow-up. (published 2026-10-20) - [Selling to EU customers: do UK businesses need e-invoices?](https://einvoices.uk/news/uk-businesses-selling-to-eu-e-invoicing): Most EU e-invoicing mandates cover only locally established businesses, so UK suppliers are usually outside them. But EU customers may still ask for Peppol. (published 2026-10-20) - [UK e-invoicing readiness checklist for the 2029 mandate](https://einvoices.uk/news/uk-e-invoicing-readiness-checklist): A practical, step-by-step e-invoicing checklist for UK businesses preparing for the April 2029 mandate: scope, data, software, Peppol, suppliers and testing. (published 2026-10-20) ## Technical - [Accounts receivable e-invoicing in the UK: send and get paid](https://einvoices.uk/news/accounts-receivable-e-invoicing-uk): How UK accounts receivable teams should prepare to send Peppol e-invoices by April 2029: customer data, validation, rejections, credit notes and cash flow. (published 2026-10-20) - [Common Peppol validation errors explained (with fixes)](https://einvoices.uk/news/common-peppol-validation-errors): The Peppol BIS Billing 3.0 validation errors UK senders hit most, with the exact rule text, why each one fires and how to fix it in the UBL. (published 2026-10-20) - [E-invoice credit notes in the UK: how they work in Peppol](https://einvoices.uk/news/credit-notes-peppol-uk): How to issue a UK credit note as a Peppol e-invoice: credit note vs negative invoice, type code 381, the original invoice reference and a valid UBL example. (published 2026-10-20) - [Does a PDF invoice count as an e-invoice? Not from 2029](https://einvoices.uk/news/does-a-pdf-invoice-count-as-an-e-invoice): HMRC accepts emailed PDFs as electronic invoices today, but the 2029 mandate needs structured, machine-readable data. A PDF alone will not be enough. (published 2026-10-20) - [Reverse charge construction e-invoices in Peppol (AE code)](https://einvoices.uk/news/domestic-reverse-charge-construction-e-invoice): How to issue a UK construction domestic reverse charge invoice in Peppol: the AE code, HMRC's wording rules, a valid UBL example and the BR-AE errors to avoid. (published 2026-10-20) - [How long to keep e-invoices: HMRC retention and archiving rules](https://einvoices.uk/news/e-invoice-archiving-retention-uk): HMRC says keep VAT invoices, including e-invoices, for 6 years. Here's what to store, where you can store it, and how other tax rules can make it longer. (published 2026-10-20) - [UK Peppol invoice XML example (UBL, validated)](https://einvoices.uk/news/e-invoice-xml-example-uk): A complete UK Peppol BIS Billing 3.0 invoice in UBL XML, with GBP, 20% and zero-rated lines and a delivery charge, validated against EN 16931 and Peppol rules. (published 2026-10-20) - [ERP e-invoicing in the UK: SAP, Oracle, Dynamics, NetSuite](https://einvoices.uk/news/e-invoicing-erp-sap-oracle-dynamics-netsuite): How to plan UK Peppol e-invoicing on an ERP such as SAP, Oracle, Microsoft Dynamics or NetSuite: integration options, questions for vendors and project risks. (published 2026-10-20) - [Law firm disbursements on e-invoices: 2029 guide](https://einvoices.uk/news/e-invoicing-professional-services-law-firms): How law firms and other professional services firms should handle disbursements, recharges and confidential detail when invoices become e-invoices. (published 2026-10-20) - [E-invoicing vs EDI: what UK businesses need to know](https://einvoices.uk/news/e-invoicing-vs-edi): EDI is an older, bilateral way to swap structured documents. Peppol e-invoicing is an open network. Here's how they differ and what 2029 may mean for EDI users. (published 2026-10-20) - [EN 16931 explained: the e-invoice standard behind Peppol](https://einvoices.uk/news/en-16931-explained): EN 16931 is the European standard defining what an e-invoice contains. What it is, how BT codes and BR rules work, how Peppol builds on it, and the UK angle. (published 2026-10-20) - [The five-corner model explained: will the UK use it?](https://einvoices.uk/news/five-corner-model-uk): A five-corner model adds the tax authority as a fifth corner that receives invoice data. The UK starts in 2029 with four corners and no real-time reporting. (published 2026-10-20) - [How to attach a PDF to a Peppol invoice (BG-24)](https://einvoices.uk/news/invoice-attachments-peppol): How to attach a PDF, timesheet or spreadsheet to a Peppol e-invoice: allowed file types, the exact UBL, and the rules that reject attachments. (published 2026-10-20) - [Master data clean-up for e-invoicing: VAT numbers and more](https://einvoices.uk/news/master-data-cleanup-e-invoicing): How to clean customer and supplier master data for UK e-invoicing: VAT numbers, legal names, Peppol IDs, VAT codes and references, with a practical checklist. (published 2026-10-20) - [Foreign currency VAT invoices as e-invoices: showing VAT in GBP](https://einvoices.uk/news/multi-currency-e-invoices-gbp): You can invoice in euros or dollars, but HMRC wants total VAT in sterling. How to do that in a Peppol e-invoice with BT-6 and BT-111, and errors to avoid. (published 2026-10-20) - [Peppol BIS Billing 3.0: a guide for UK businesses](https://einvoices.uk/news/peppol-bis-billing-3-uk-guide): Peppol BIS Billing 3.0 is the invoice and credit note format used on Peppol. What it contains, the rules UK invoices trip on, current versions and UK unknowns. (published 2026-10-20) - [How to check if a UK company is on Peppol](https://einvoices.uk/news/peppol-directory-lookup-uk): Search the free Peppol Directory by company name or Peppol ID. A missing listing does not prove a business is not on Peppol; here is how to check properly. (published 2026-10-20) - [Peppol scheme 9932 and 0088: EAS codes for UK businesses](https://einvoices.uk/news/peppol-eas-codes-uk-9932-0088): 9932 is the Peppol scheme code for a UK VAT number and 0088 is a GS1 Global Location Number. How each is used, where it goes in the invoice and what to avoid. (published 2026-10-20) - [Peppol ID Isle of Man: which identifier to use](https://einvoices.uk/news/peppol-id-isle-of-man): There is no Isle of Man Peppol scheme. Manx VAT-registered businesses use 9932 (UK VAT number) with their 00-prefixed number, e.g. 9932:gb001234567. (published 2026-10-20) - [Peppol ID Northern Ireland: GB or XI VAT number?](https://einvoices.uk/news/peppol-id-northern-ireland-xi): There is no XI scheme in Peppol. Northern Ireland businesses normally register a 9932 ID using their GB VAT number; XI is for EU goods trade documentation. (published 2026-10-20) - [Peppol Invoice Response vs MLR and MLS explained](https://einvoices.uk/news/peppol-invoice-response-message-level-response): MLR and its successor MLS tell the sender's provider if an invoice was delivered or rejected; Invoice Response tells the supplier what the buyer did with it. (published 2026-10-20) - [Peppol ID UK: how participant identifiers work](https://einvoices.uk/news/peppol-participant-id-uk): A UK Peppol ID is a scheme code plus a value, such as 9932:gb123456789 for a VAT number. Here is the exact format, the case rules and which ID to use. (published 2026-10-20) - [Peppol SMP and SML explained: how invoices find the buyer](https://einvoices.uk/news/peppol-smp-sml-explained): The SML is Peppol's DNS-based locator and the SMP is the registry of what each participant can receive. How a lookup works, step by step, with a UK example. (published 2026-10-20) - [BR-CO-15 error: Invoice total amount with VAT explained and fixed](https://einvoices.uk/news/peppol-validation-error-br-co-15): BR-CO-15 fires when BT-112 does not equal BT-109 plus BT-110, or the UBL has more than one VAT total in the invoice currency. Causes, tests and fixes with UBL. (published 2026-10-20) - [Public Procurement (Electronic Invoices etc.) Regulations 2019](https://einvoices.uk/news/public-sector-e-invoicing-regulations-2019): The 2019 regulations made UK public bodies accept EN 16931 e-invoices. What they required, how Scotland differs, what replaced them, and what 2029 adds. (published 2026-10-20) - [Buyer reference (BT-10) and PO number in Peppol invoices](https://einvoices.uk/news/purchase-order-reference-buyer-reference-peppol): Peppol invoices need a buyer reference (BT-10) or a PO reference (BT-13) or rule PEPPOL-EN16931-R003 rejects them. What each is for and how to fill it. (published 2026-10-20) - [Self-billing and e-invoicing: what HMRC rules mean for 2029](https://einvoices.uk/news/self-billing-e-invoicing-uk): Self-billing will survive e-invoicing: Peppol has a self-billing standard and HMRC's Notice 700/62 still applies. Here's what is confirmed and what is open. (published 2026-10-20) - [UBL vs CII: which e-invoice format should UK businesses use?](https://einvoices.uk/news/ubl-vs-cii-uk): UBL and CII are the two XML syntaxes for EN 16931 e-invoices. How they differ, which one Peppol requires, and what it means for UK businesses before 2029. (published 2026-10-20) - [UK VAT category codes in Peppol: S, Z, E, AE and O explained](https://einvoices.uk/news/uk-vat-category-codes-peppol): Which Peppol VAT category code to use for UK standard, reduced, zero-rated, exempt, outside-scope and reverse charge supplies, and the rules each triggers. (published 2026-10-20) - [What must a VAT invoice include? HMRC rules mapped to e-invoices](https://einvoices.uk/news/uk-vat-invoice-requirements-e-invoicing): HMRC's list of what a full VAT invoice must show, and where each item goes in a Peppol BIS Billing 3.0 e-invoice, including the fields Peppol adds on top. (published 2026-10-20) ## Tools - [All tools](https://einvoices.uk/tools): Free tools for the UK e-invoicing mandate. - [Am I in scope?](https://einvoices.uk/tools/am-i-in-scope): Answer four questions to see whether and how the April 2029 mandate applies to you. - [Readiness score and plan](https://einvoices.uk/tools/readiness-score): Twelve questions, a score out of 100 and a printable plan for now, 2027 and 2028. - [UK Peppol directory lookup](https://einvoices.uk/tools/peppol-directory-lookup): Check whether a UK customer or supplier is on Peppol, by name, VAT number or GLN. - [E-invoice validator](https://einvoices.uk/tools/e-invoice-validator): Validate a UBL invoice against Peppol BIS Billing 3.0 and EN 16931, errors explained. - [E-invoice viewer](https://einvoices.uk/tools/e-invoice-viewer): Open a UBL or Peppol XML invoice as a readable, printable invoice. Runs in your browser. - [VAT invoice checker](https://einvoices.uk/tools/vat-invoice-checker): Check an invoice against HMRC's full VAT invoice requirements, including VAT number check digits. - [Cost and savings calculator](https://einvoices.uk/tools/cost-savings-calculator): Estimate what invoices cost you today and what e-invoicing could save, with your own figures. ## Data - [UK Peppol adoption tracker](https://einvoices.uk/data/uk-peppol-adoption): Daily count of Peppol Directory entries with country GB, by identifier scheme and document type, with method, caveats and a suggested citation. Data licence: CC BY 4.0, credit einvoices.uk. - [Daily snapshots (CSV)](https://einvoices.uk/data/uk-peppol-adoption.csv): Full history of the tracker figures, CC BY 4.0. - [Entries by listing date (CSV)](https://einvoices.uk/data/uk-peppol-listing-dates.csv): GB Directory entries by registration date, CC BY 4.0. ## Glossary - [E-invoicing glossary A to Z: UK terms explained](https://einvoices.uk/glossary): Plain-English definitions of the e-invoicing terms UK businesses will meet before April 2029, from Access Point and CIUS to UBL, ViDA and the VAT gap. Markdown: https://einvoices.uk/glossary.md - [Access Point (AP)](https://einvoices.uk/glossary#access-point): A certified provider that connects you to the Peppol network and sends and receives documents on your behalf. - [AS4](https://einvoices.uk/glossary#as4): The secure messaging protocol Peppol Access Points use to exchange documents with each other. - [B2B, B2G, B2C](https://einvoices.uk/glossary#b2b-b2g-b2c): Business-to-business, business-to-government and business-to-consumer. - [BIS (Business Interoperability Specification)](https://einvoices.uk/glossary#bis): Peppol's name for an implementation guide for a business process, such as billing. - [Bridging software](https://einvoices.uk/glossary#bridging-software): A tool that links spreadsheets or other non-compatible records to HMRC's systems so a business can meet Making Tax Digital requirements. - [BT- numbers](https://einvoices.uk/glossary#bt-numbers): Business Terms in EN 16931, each identifying a data field. - [BR- rules](https://einvoices.uk/glossary#br-rules): Business Rules in EN 16931 and Peppol that validation checks against. - [CII (Cross Industry Invoice)](https://einvoices.uk/glossary#cii): An XML syntax from UN/CEFACT. - [CIUS (Core Invoice Usage Specification)](https://einvoices.uk/glossary#cius): A set of extra rules layered on EN 16931 for a specific community. - [Clearance model](https://einvoices.uk/glossary#clearance-model): "A government authority or approved third party validates and clears e-invoices prior to being issued to the customer." The UK is not using one. - [Continuous transaction controls (CTC)](https://einvoices.uk/glossary#continuous-transaction-controls): "A collective term for various real time digital tax controls". - [Credit note](https://einvoices.uk/glossary#credit-note): A document reducing or cancelling an amount invoiced. - [Decentralised model](https://einvoices.uk/glossary#decentralised-model): "E-invoice data is submitted through authorised software providers", with no central government hub. - [Digital links](https://einvoices.uk/glossary#digital-links): Under MTD for VAT, the electronic transfer of data between software programs. - [EAS code (Electronic Address Scheme)](https://einvoices.uk/glossary#eas-code): A code that says what kind of identifier a Peppol address uses. - [EDI (electronic data interchange)](https://einvoices.uk/glossary#edi): Older, usually bilateral exchange of structured business documents. - [EDIFACT](https://einvoices.uk/glossary#edifact): A UN standard for EDI "approved and published by the United Nations Economic Commission for Europe (UNECE) in 1987." - [E-invoice](https://einvoices.uk/glossary#e-invoice): "An invoice document that is issued, transmitted, and received in a structured format which allows for automatic electronic processing." A PDF is not one. - [EN 16931](https://einvoices.uk/glossary#en-16931): The European standard setting out the core data of an electronic invoice. - [E-reporting](https://einvoices.uk/glossary#e-reporting): Sending transaction data, rather than full invoices, to a tax authority. - [Five-corner model](https://einvoices.uk/glossary#five-corner-model): Builds on the four-corner model by "introducing the ability for businesses to share information in real time, or close to real time, with the government authority (who act as the 5th corner)." See Five-corner model. - [Four-corner model](https://einvoices.uk/glossary#four-corner-model): "An e-invoicing model where businesses exchange e-invoices through their service providers". - [GLN (Global Location Number)](https://einvoices.uk/glossary#gln): A GS1 identifier for organisations and locations, common in the NHS and retail. - [Interoperability](https://einvoices.uk/glossary#interoperability): The ability to exchange invoices with anyone, whichever provider each side uses. - [Invoice Response](https://einvoices.uk/glossary#invoice-response): A Peppol message from buyer to supplier saying an invoice has been received, accepted, rejected or queried. - [Making Tax Digital (MTD)](https://einvoices.uk/glossary#making-tax-digital): HMRC's programme requiring digital records and software filing, for VAT since 2019 and for Income Tax since April 2026. - [Message Level Response (MLR)](https://einvoices.uk/glossary#message-level-response): A technical Peppol message reporting whether a received document passed validation. - [OpenPeppol](https://einvoices.uk/glossary#openpeppol): The non-profit association under Belgian law that governs Peppol. - [Participant ID / Peppol ID](https://einvoices.uk/glossary#participant-id-peppol-id): Your address on Peppol: an EAS code plus an identifier, such as a UK VAT number. - [PDF/A](https://einvoices.uk/glossary#pdf-a): An archival PDF format. - [Peppol](https://einvoices.uk/glossary#peppol): The international network and specifications the UK announced on 23 June 2026 as "the core interoperability network for e-invoicing in the UK". - [Peppol Authority](https://einvoices.uk/glossary#peppol-authority): The body that oversees Peppol in a jurisdiction. - [Peppol BIS Billing 3.0](https://einvoices.uk/glossary#peppol-bis-billing-3-0): Peppol's invoice and credit note specification, a CIUS of EN 16931. - [Peppol Directory](https://einvoices.uk/glossary#peppol-directory): A searchable list of registered Peppol participants. - [Real-time reporting (RTR)](https://einvoices.uk/glossary#real-time-reporting): "The process of reporting tax information to tax authorities as transactions are made." Not part of the UK mandate in 2029. - [Reverse charge](https://einvoices.uk/glossary#reverse-charge): Where the customer, not the supplier, accounts for VAT, as in the domestic reverse charge for construction. - [Self-billing](https://einvoices.uk/glossary#self-billing): The customer raises the invoice on the supplier's behalf, by agreement. - [Simplified invoice](https://einvoices.uk/glossary#simplified-invoice): A shorter VAT invoice allowed for smaller retail sales. - [SML and SMP](https://einvoices.uk/glossary#sml-and-smp): The Service Metadata Locator and Service Metadata Publisher, the "phone book" services that tell a sender's Access Point where and how to deliver. - [Structured data](https://einvoices.uk/glossary#structured-data): Data in fixed, labelled fields that software can read without human interpretation. - [UBL (Universal Business Language)](https://einvoices.uk/glossary#ubl): An "open standard for electronic business documents". - [Validation](https://einvoices.uk/glossary#validation): Automatic checks that an invoice meets the schema and business rules. - [VAT category code](https://einvoices.uk/glossary#vat-category-code): A code on each invoice line saying how VAT applies, such as S (standard), Z (zero), E (exempt) or AE (reverse charge). - [VAT gap](https://einvoices.uk/glossary#vat-gap): "The difference between the VAT theoretical liability, estimated using national accounts data, and actual cash receipts." HMRC put it at 6.6% (£12.1 billion) for 2024 to 2025. - [VAT invoice](https://einvoices.uk/glossary#vat-invoice): "An invoice which must contain information required by the VAT Act." See VAT invoice requirements. - [ViDA (VAT in the Digital Age)](https://einvoices.uk/glossary#vida): The EU package adopted in March 2025, including digital reporting for intra-EU trade from 1 July 2030. - [XML](https://einvoices.uk/glossary#xml): The text format in which UBL and CII invoices are written. ## Policies - [About](https://einvoices.uk/about): Who runs einvoices.uk, how we check sources, and how to cite us. - [Editorial policy](https://einvoices.uk/editorial-policy): How we research, write and correct our coverage. - [Corrections](https://einvoices.uk/corrections): Corrections policy and log of changes. - [Contact](https://einvoices.uk/contact): How to reach the editor. - [Privacy](https://einvoices.uk/privacy): Privacy notice. - [Authors](https://einvoices.uk/authors): Who writes for us. - [Floris Lindenaar](https://einvoices.uk/authors/floris-lindenaar): Editor, e-invoicing expert - [einvoices.uk editorial team](https://einvoices.uk/authors/editorial-team): Editorial team ## Optional - [Full text of every article](https://einvoices.uk/llms-full.txt): All articles as Markdown in one file, for ingestion. - [RSS feed](https://einvoices.uk/feed.xml): Every article, newest first. - [Sitemap](https://einvoices.uk/sitemap.xml) - [Google News sitemap](https://einvoices.uk/news-sitemap.xml)