Accounting Software with HMRC Integration: What to Look For

Introduction

"HMRC-compatible" and "MTD-ready" are phrases you will see on virtually every UK accounting platform. But what does HMRC integration actually mean? What should it cover? And what is the difference between basic compliance and genuinely useful integration?

This article explains what HMRC integration involves, what features to look for, and compares how the major platforms handle the connection to HMRC's systems.

What HMRC Integration Means

At its most basic, HMRC integration means the software can communicate with HMRC's APIs to submit information digitally. This covers MTD for VAT (submitting VAT returns), MTD for Income Tax (submitting quarterly updates and final declarations), Self Assessment (filing your annual tax return), and CIS (Construction Industry Scheme returns).

Not all platforms cover all of these. Some only handle VAT. Some cover VAT and Self Assessment. Few cover CIS. Understanding which HMRC services a platform integrates with is the first question to ask.

The Technical Reality

HMRC's APIs require specific technical implementations. The software must authenticate via OAuth 2.0 (HMRC's preferred authentication method), include fraud prevention headers with each API call (device information, connection details, etc.), handle HMRC's test and production environments correctly, manage rate limiting and error handling gracefully, and support the specific API versions HMRC requires.

This technical complexity means that smaller or newer platforms sometimes have less polished HMRC integrations. A platform that has been submitting to HMRC for years will have encountered and resolved more edge cases than one that launched recently.

What to Look For

MTD for VAT

This is the minimum. Any platform you consider should be HMRC-recognised for MTD for VAT. Check HMRC's official list of compatible software. The submission should be seamless: review your return, confirm, and submit. You should receive confirmation of acceptance from HMRC within the platform.

MTD for Income Tax

From April 2026, self-employed individuals and landlords above the income threshold must submit quarterly updates. Ensure your platform supports this or has a clear plan for when it will. Quarterly updates require your income and expenses to be submitted every three months, which means your records need to be current.

Self Assessment

The ability to file your complete Self Assessment through the platform saves you from using HMRC's own filing interface or a separate filing tool. Not all bookkeeping platforms offer this. Some prepare your data but require you to file through HMRC directly or through a specialist tool.

CIS Returns

If you work in construction, check whether the platform supports CIS. This includes contractor verification with HMRC, monthly CIS return filing, and CIS deduction recording. Very few platforms handle CIS natively.

Error Handling

What happens when an HMRC submission fails? Good platforms provide clear error messages, allow you to correct issues, and resubmit. Poor platforms leave you guessing about what went wrong.

Platform Comparison

Accounted

Accounted integrates with HMRC for VAT returns, Self Assessment, and CIS returns. The integration uses OAuth 2.0 authentication, and Penny handles the preparation of submissions from your automatically maintained records.

Key HMRC features: VAT return submission, Self Assessment filing, CIS monthly returns, fraud prevention headers handled automatically, proactive deadline reminders, and submission history with confirmation records.

Where Accounted's HMRC integration adds particular value is in the preparation phase. Because Penny maintains your records automatically through AI categorisation and WhatsApp receipt processing, your data is consistently ready for submission when deadlines approach. There is no last-minute scramble to catch up.

Pricing starts at £14 per month. See the pricing page.

Xero

Xero is HMRC-recognised for MTD for VAT and has a long track record of reliable submissions. Xero handles the technical requirements well and provides clear confirmation of submissions.

Xero's HMRC integration is mature and proven. Thousands of UK businesses file through Xero every quarter, and the process is well-tested.

QuickBooks

QuickBooks supports MTD for VAT filing and is HMRC-recognised. The submission process is straightforward, and the platform handles fraud prevention headers and authentication automatically.

FreeAgent

FreeAgent has strong HMRC integration covering VAT and Self Assessment. As a UK-focused platform, HMRC compliance has been a priority from the start. The integration is reliable and well-supported.

Sage

Sage has extensive HMRC integration across its product range. As one of the oldest UK accounting software providers, Sage has deep experience with HMRC's systems and requirements.

GoSimpleTax

GoSimpleTax focuses specifically on Self Assessment filing with strong HMRC integration. It handles complex tax situations well and provides clear guidance through the filing process.

TaxCalc

TaxCalc offers comprehensive HMRC filing for Self Assessment, with detailed tax calculations. It is particularly popular with accountants and those with complex tax affairs.

Beyond Basic Compliance

The difference between basic HMRC compliance and genuinely useful integration comes down to several factors.

Submission history: can you see a record of all your past HMRC submissions? This is valuable for reference and for resolving any disputes.

Deadline management: does the platform remind you of upcoming filing deadlines? Better yet, does it assess whether your records are ready for submission and alert you if they are not?

Error prevention: does the platform validate your return before submission? Catching errors before they reach HMRC is far better than receiving a rejection.

Post-submission confirmation: do you get clear confirmation that HMRC has accepted your submission, including the receipt ID?

Amendment handling: if you need to amend a submitted return, does the platform support this process?

The Authentication Experience

HMRC integration requires you to authenticate with your HMRC Government Gateway account. This typically involves being redirected to HMRC's login page, signing in, granting permission, and being redirected back to your accounting software.

Some platforms handle this smoothly. Others require re-authentication frequently, which becomes annoying. The best platforms maintain your HMRC connection for as long as HMRC's tokens allow and re-authenticate seamlessly when needed.

Important note: your accounting software should only use OAuth 2.0 for HMRC authentication. This means you log in to HMRC directly and grant permission. Your Government Gateway username and password should never be stored by the accounting software itself.

Future HMRC Requirements

HMRC's digital strategy continues to evolve. MTD for Income Tax is the next major milestone, with quarterly reporting requirements for self-employed individuals and landlords. Platforms that are already preparing for this have an advantage.

Beyond MTD, HMRC is gradually expanding its digital services. Choosing a platform that actively maintains its HMRC integration and adapts to new requirements is more future-proof than one that treats HMRC compliance as a checkbox.

Our Recommendation

For comprehensive HMRC integration including VAT, Self Assessment, and CIS, with AI-powered record preparation, Accounted provides the most complete sole trader experience.

For proven, reliable VAT filing backed by years of track record, Xero is the established choice.

For focused Self Assessment filing with expert guidance, GoSimpleTax offers excellent value.

For free comprehensive HMRC integration, FreeAgent through NatWest covers VAT and Self Assessment at no cost.

Whatever you choose, verify that the platform is on HMRC's official list of recognised software for the specific obligations you need to meet.

Sign up for Accounted and let Penny handle your HMRC obligations while you focus on your business.