Is AccountsOS HMRC-Recognised? MTD-Compatible Software Explained (2026)

HMRC-recognised software is software that has been built to HMRC's Making Tax Digital technical specification and can connect to HMRC's official MTD application programming interface (API) to send and receive data. In practice it means three things: the software keeps records in the digital format HMRC requires, it connects securely to HMRC, and it can file the return straight into HMRC's systems.

HMRC does not write the software itself. Instead it publishes the technical standard, and software providers build to it and connect through HMRC's developer platform. A recognised provider is registered on that platform and uses HMRC's production API to file real returns.

The phrase MTD-compatible is used to mean the same thing. What matters for you is simple: can the software file your return directly to HMRC under MTD, and does it meet HMRC's standards for record keeping and security.

AccountsOS is MTD-compatible software built to HMRC's Making Tax Digital VAT specification. It connects to HMRC through HMRC's official MTD VAT API, submits your VAT return directly, and stores HMRC's confirmation receipt and form bundle reference against the period.

The connection meets HMRC's technical requirements, including the fraud prevention header information HMRC mandates for every submission. Those headers are validated by HMRC, and AccountsOS sends a complete and valid set on every VAT call.

In short, when you file your VAT return through AccountsOS, it goes directly into HMRC's systems through the recognised MTD channel, not through a workaround.

Connecting is a one-time authorisation. You click connect, you are taken to HMRC's own sign-in page, and you authorise AccountsOS to file on your behalf. This uses OAuth, the same secure standard banks use for open banking, which means AccountsOS never sees or stores your HMRC username or password.

Once connected, AccountsOS can read your VAT obligations from HMRC (so it knows which periods are open and when they are due), pull your filing history, and submit returns. The authorisation can be revoked at any time, either in AccountsOS or in your HMRC account.

Every submission carries the fraud prevention data HMRC requires, which describes the device and connection making the request. This is a mandatory part of the MTD standard and is one of the checks HMRC runs before accepting a return.

HMRC publishes a software finder on GOV.UK where you can search for tools that work with Making Tax Digital for VAT. It is a good starting point, but it is not the only test, and the list updates periodically rather than instantly, so a newly recognised provider may take time to appear.

The more direct test is the one that matters in practice: can the software take you to HMRC's own sign-in page to authorise it, and does it file your return and return a confirmation receipt from HMRC. If it does both, it is connecting through the recognised MTD channel.

If you are ever unsure about a specific provider, you can ask them directly which HMRC MTD APIs they are registered for and whether they file through HMRC's production environment.

These phrases get mixed up in marketing. Here is what each one should mean so you can read software claims accurately.

Today, AccountsOS files VAT returns directly to HMRC under Making Tax Digital. It calculates the 9-box return from your transactions, you review it, and it submits to HMRC and stores the receipt.

Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) begins on 6 April 2026 for self-employed people and landlords with qualifying income over £50,000, with the threshold dropping to £30,000 from April 2027 and £20,000 from April 2028. AccountsOS keeps your records in the digital format that regime requires and is built to support ITSA quarterly updates as it rolls out.

Making Tax Digital for Corporation Tax has no confirmed start date, so limited companies are currently only affected by MTD through VAT if they are VAT-registered.

Filing tax is not somewhere to cut corners. Using software that connects through the recognised MTD channel means your return is accepted by HMRC the first time, you get a genuine receipt as proof, and your sign-in stays protected because you authorise through HMRC rather than handing over a password.

It also means your records meet HMRC's digital requirements, which matters if HMRC ever queries a return. With AccountsOS, every figure on the return traces back through digital links to the underlying transaction and its original document, which is exactly the chain HMRC expects to see.

You can start free for 14 days with no card. Import or connect your transactions, let the AI categorise them, and watch your VAT position update live. When a period is due, connect to HMRC once and file directly under MTD.

From £20 a month after the trial, you get the AI bookkeeping, receipt capture, the live VAT calculation, and direct submission to HMRC, all in one place, with Finn able to answer questions about your numbers in plain English.