MTD ITSA Explained: A Plain English Guide

If you have been hearing the term "MTD ITSA" and wondering what it actually means, you are not alone. HMRC is not known for making things easy to understand, and this particular abbreviation is a prime example.

This guide cuts through the jargon and explains MTD ITSA in plain English — what it stands for, who it affects, what you have to do, and when you have to do it.

What Does MTD ITSA Stand For?

MTD ITSA stands for Making Tax Digital for Income Tax Self Assessment.

Let's break that down:

  • Making Tax Digital (MTD) — HMRC's programme to move the UK tax system from paper and annual returns to digital records and regular online submissions
  • Income Tax — the tax you pay on your earnings (as opposed to VAT or Corporation Tax, which have their own MTD rules)
  • Self Assessment (SA or ITSA) — the system used by self-employed people and landlords to report their income and pay tax

So MTD ITSA is simply the part of Making Tax Digital that applies to people who currently file Self Assessment tax returns — mainly sole traders and landlords.

You might also see it written as "MTD for ITSA" or "MTD for Income Tax." They all mean the same thing.

What Is Actually Changing?

Under the old Self Assessment system, you filed one tax return per year. You gathered up your income and expenses, filled in the return (online or on paper), and submitted it by 31 January.

Under MTD ITSA, the process changes in three important ways:

1. Digital Record Keeping

You must keep your business records — income received, expenses paid — in digital format using compatible software. A shoebox of receipts and a spreadsheet at year end no longer meets the requirements.

This does not mean you need to scan every receipt into an app (though you can). It means your records of income and expenses must be entered into HMRC-recognised software as they happen, not compiled from memory months later.

2. Quarterly Updates

Instead of reporting once a year, you submit a summary of your income and expenses to HMRC every three months. There are four quarterly updates per tax year, each due about a month after the quarter ends.

These updates are not full tax returns. They are progress reports — a snapshot of how your business is doing financially. For a detailed walkthrough of the quarterly process, see our guide on HMRC quarterly reporting.

3. Final Declaration

At the end of the tax year, you submit a Final Declaration. This replaces your Self Assessment tax return. It brings together all your income (not just self-employment — employment income, savings, etc.) and confirms your total tax liability for the year.

Who Does MTD ITSA Affect?

MTD ITSA applies to individuals who:

  • Are self-employed (sole traders), AND/OR
  • Receive property income (landlords)

AND whose gross qualifying income exceeds the threshold:

  • From April 2026: Over £50,000 per year
  • From April 2027: Over £30,000 per year

Important: The threshold is based on your gross income (turnover), not your profit. If you invoice £55,000 in a year but your expenses bring your profit down to £25,000, you are still above the £50,000 threshold.

Who Is NOT Affected (Yet)?

  • Employees who only have PAYE income — MTD ITSA does not apply to you
  • Limited company directors — you are covered by separate MTD for Corporation Tax plans
  • People earning under £30,000 from self-employment/property — no confirmed date for inclusion yet
  • Partnerships — expected to be included later, but not in the initial rollout

The Full MTD ITSA Timeline

Here is the timeline of what has happened and what is coming:

Date What Happens
April 2019 MTD for VAT launched (VAT-registered businesses)
April 2026 MTD for Income Tax launches for £50,000+ earners
April 2027 MTD for Income Tax extends to £30,000+ earners
TBC Partnerships brought into MTD for Income Tax

The Income Tax part of Making Tax Digital was originally planned for 2024 but was delayed twice. It is now live for the first group as of April 2026.

What Software Do You Need?

You need software that is recognised by HMRC and can:

  • Store digital records of your income and expenses
  • Connect to HMRC's MTD API to submit quarterly updates
  • Generate your End of Period Statement and Final Declaration

There is a wide range of options, from full accounting suites to simpler tools designed purely for MTD compliance. If you are a sole trader with relatively straightforward finances, a dedicated MTD tool will likely be quicker and easier than learning a full accounting package.

Our comparison of the best MTD software for sole traders covers the main choices, including pricing and features.

ClearMTD is built from the ground up for MTD ITSA. It does one thing well: keeps you compliant with minimal effort. Sign up for free and see for yourself.

Common Misconceptions About MTD ITSA

"I already file online, so I am already compliant"

Filing your Self Assessment return online through HMRC's website is not the same as MTD. MTD requires compatible software that connects via HMRC's API and supports quarterly submissions. The existing HMRC Self Assessment portal does not meet this requirement.

"Quarterly updates mean I pay tax four times a year"

No. Quarterly updates are reporting summaries, not tax payments. Your tax is still calculated annually and paid according to the usual payment schedule (31 January and 31 July for payments on account). The quarterly updates just keep HMRC informed of your income throughout the year.

"MTD means more tax"

MTD does not change how much tax you owe. It changes how and when you report your income. You claim the same expenses, the same allowances, and pay the same rates. The difference is in the reporting process, not the tax calculation.

"I can just ignore it until HMRC contacts me"

If your income is above the threshold, you are legally required to comply. HMRC may not chase you immediately, but failure to register and submit quarterly updates will result in penalty points and eventual fines. It is far better to set up voluntarily than to wait for enforcement.

How to Get Started

Getting started with MTD ITSA involves three steps:

  1. Check if you are affected — is your gross self-employment and/or property income above £50,000? If yes, you are in the scheme from April 2026. If it is between £30,000 and £50,000, you start from April 2027.

  2. Register with HMRC — sign up for MTD for Income Tax through your Government Gateway account. This is separate from your Self Assessment registration.

  3. Choose and set up software — pick an HMRC-recognised tool, enter your details, and start recording your income and expenses digitally.

If you are looking for more detail on the process for sole traders specifically, see our complete guide to Making Tax Digital for sole traders.

Frequently Asked Questions

Is MTD ITSA the same as Making Tax Digital?

Making Tax Digital is the overall programme. MTD ITSA is the specific part that applies to Income Tax Self Assessment — i.e., sole traders and landlords. There are separate MTD programmes for VAT (already live) and Corporation Tax (planned).

Will MTD ITSA replace Self Assessment?

For those within the scheme, yes — the Final Declaration replaces the Self Assessment return. However, the concept is the same: you are confirming your total income and tax position for the year. The difference is that quarterly updates provide running data throughout the year, and the Final Declaration brings it all together.

Can I opt out of MTD ITSA?

If your income is above the threshold, MTD ITSA is mandatory. You cannot opt out. However, if your income drops below the threshold for a sustained period, you may be able to leave the scheme. Voluntary registration is also possible if you are below the threshold but want to use the system.

How much does MTD ITSA compliance cost?

Software costs vary widely. Some providers charge £10-15 per month, others charge £20-40+ per month. HMRC offers a basic free tool for very simple cases. ClearMTD offers a free tier to get started, with affordable plans for ongoing compliance. Check our pricing.

What if I have both self-employment and property income?

Your qualifying income is the total of both. If your self-employment income is £35,000 and your property income is £20,000, your combined qualifying income is £55,000 — which puts you above the £50,000 threshold. You would need to submit quarterly updates covering both income sources.