MTD for IT compliant tax software

Making Tax Digital for Income Tax Self Assessment (MTD IT) is the most consequential change to UK personal tax filing in decades. If your practice has clients with income above £50,000, those clients are now in scope. Getting your software right is not optional, it is the difference between filing correctly and exposing your clients to HMRC penalties.

This blog is part of our series, Making Tax Digital for Income Tax: Your Complete Practice Guide to Multiple Cohorts, Workflows, and Compliance.

What MTD IT Actually Requires From Your Software

Quarterly submissions are one part of the picture, but they are not the whole story. Full MTD IT compliance requires your software to support:

Digital record keeping — client income and expense data maintained digitally throughout the year
Quarterly update submissions — four submissions per year to HMRC via API (not through the Government Gateway portal)
Final Declarations — the year-end submission that finalises a client’s tax position, replacing the traditional SA100 return

If your current software handles only quarterly updates but not Final Declarations, you do not have a fully MTD-compliant workflow. This is a gap that matters: the Final Declaration is where the tax liability is confirmed and filed.

The Rollout Timeline You Need to Know

HMRC’s MTD IT rollout is phased by income level:

April 2026 — Mandatory for self-employed individuals and landlords with income over £50,000
April 2027 — Mandatory for income over £30,000
April 2028 — Mandatory for income over £20,000

This means that if you have any clients with income above £50,000, they are in scope now. If you have not already confirmed your software’s MTD ITSA capability, that is the first action to take.

What to Check in Your Current Software

Run through this checklist for any software you are currently using or evaluating:

Does it have HMRC recognition for MTD ITSA?
Does it support Final Declarations, not just quarterly updates?
Does it submit via HMRC’s API?
Does it handle multiple income sources?
Is it updated automatically when HMRC changes the rules?

Bright’s MTD IT solution meets all of these requirements, no matter what MTD IT mixed client workflows accountants are working with.

The Risk of Using Software That Is Not Fully MTD-Ready

The consequences of non-compliance are not abstract. HMRC has a penalty regime for MTD ITSA that applies to:

Failure to keep digital records
Failure to submit quarterly updates on time
Errors in the Final Declaration

Penalties are points-based, accruing over time. Clients who are late with multiple quarterly submissions face cumulative financial penalties. If your software is not capable of making the correct submissions in the correct format, your practice may face scrutiny.

Using HMRC-recognised software is the clearest risk mitigation available. It ensures submissions are made in the correct format, via the correct channel, and with the correct data structure. check here for further information on five key actions that accountants should take for MTD IT.

How BrightTax Supports MTD IT Compliance

BrightTax is a single integrated platform covering individual tax (SA100/MTD ITSA), corporation tax (CT600), partnership returns (SA800), accounts production, and VAT. For MTD ITSA specifically:

Full HMRC recognition for Final Declarations
Direct API submission to HMRC — no manual portal entry required
Integrated individual and partnership tax — so partnership income flowing through to personal returns is handled within the same system
VAT MTD compliance already live — for practices managing client VAT alongside income tax
Automatic updates via cloud deployment — when HMRC updates its MTD API, BrightTax is updated without requiring manual software installation

Preparing Your Practice for the April 2026 Deadline

If you have not already taken these steps, prioritise them now:

Identify all clients with income over £50,000 — these are mandated for MTD ITSA from April 2026
Confirm your software’s MTD IT status — ask your vendor specifically about Income Tax Final Declaration capability
Communicate with in-scope clients — they need to understand the obligation to keep digital records, which is an HMRC requirement on the client, not just the practice
Review your engagement letters — MTD IT changes the nature of the service you provide (four quarterly touchpoints per year rather than one annual return)

Bright’s integrated MTD IT solution facilitates quarterly updates, final declarations, and managing your workflow throughout the year.

Frequently Asked Questions

What is the difference between MTD VAT and MTD ITSA?

MTD VAT requires VAT-registered businesses to keep digital records and submit VAT returns via compatible software. MTD ITSA applies to self-employed individuals and landlords and requires quarterly income and expense updates plus an annual Income Tax Final Declaration. They are separate HMRC programmes and require separate software recognition. BrightTax supports both.

Is MTD ITSA mandatory for all self-employed clients from April 2026?

No — the April 2026 mandate applies only to clients with qualifying income above £50,000. Clients earning between £30,000 and £50,000 become mandated from April 2027. Below £30,000, clients may volunteer for MTD ITSA or wait until HMRC mandates it (currently expected from April 2028 for income above £20,000).

Does MTD ITSA replace the self-assessment tax return?

Yes, for in-scope clients. The SA100 return is replaced by the combination of quarterly updates and an Income Tax Final Declaration.

This content may have been developed with the assistance of AI tools. Content is reviewed by a member of the Bright team before publication. Guidance on legislation can be obtained from your industry body.