Making Tax Digital for Landlords — The Complete 2026 Guide

1. What is Making Tax Digital?

For years, landlords had a simple routine: gather your receipts sometime around Christmas, hand everything to your accountant (or log into HMRC yourself), and file one Self Assessment return by 31 January. Done for another year.

That system is gone. Making Tax Digital for Income Tax Self Assessment — MTD ITSA, as HMRC like to call it — replaces the annual return with something quite different. Under the new rules, you'll need to:

1. Keep digital records of every bit of rental income and every expense, as they happen
2. Send HMRC a quarterly summary through compatible software (not their website — more on that later)
3. Wrap it all up with a Final Declaration after the tax year ends

So instead of one filing per year, you're looking at five. Why five? Four quarterly updates plus the Final Declaration at the end. It's a big shift, and it started on 6 April 2026.

2. Who must comply — and when

Here's where a lot of landlords get caught out: the threshold is based on gross income, not profit. That means your total rent before you deduct a single expense. If you collect £52,000 in rent across your properties but spend £20,000 on maintenance, agents, and insurance, HMRC doesn't care about the £32,000 profit — they look at the £52,000. You're in.

One thing that surprises people: once you're in, you can't just opt out next year if your income dips slightly. You'd need your gross income to fall below the threshold for three consecutive tax years before HMRC lets you leave MTD. So for most landlords with multiple properties, this is essentially permanent.

3. The quarterly deadlines

Don't make the mistake of thinking in calendar quarters here. The UK tax year runs from 6 April to 5 April — not January to December — so the quarters are slightly offset from what you might expect. Each one gives you roughly a month and two days after the quarter closes to submit.

Your very first deadline? 7 August 2026. That gives you about four months from now to get your software connected, categorise your transactions, and file Q1. Not a huge amount of time if you're starting from scratch.

4. What you submit each quarter

Each quarterly update is a cumulative year-to-date summary. This trips people up initially, so let's be clear: you're not reporting just that quarter's figures. You're reporting everything from 6 April up to the end of the current quarter, mapped to the SA105 property tax boxes.

In practice, that means:

• Q1 covers your first three months of the tax year
• Q2 rolls in everything from Q1 plus the next three months — six months total
• By Q3 you're reporting nine months, and Q4 covers the full year

So what numbers does HMRC actually want to see? It comes down to the SA105 boxes. Here are the ones that matter for most landlords:

Income

• Box 20: Your total rents and other property income — this is where all your rental payments go
• Box 22: Premiums for the grant of a lease, if you've charged any (most landlords haven't)
• Box 23: Reverse premiums — again, unusual, but HMRC has a box for it

Expenses

• Box 24: Running costs like buildings insurance, ground rent, and utilities you're covering during void periods
• Box 25: Repairs and maintenance — fixing a boiler counts, but adding an extension doesn't (that's capital improvement, not a repair)
• Box 26: Finance costs, though only for non-residential property
• Box 27: Accountant fees, solicitor bills, and what you pay your letting agent
• Box 28: Costs of services like gardening or cleaning communal areas
• Box 29: The catch-all — advertising costs, mileage to viewings, phone calls to tenants

5. The Final Declaration

Think of the Final Declaration as the replacement for your old annual Self Assessment return. After you've submitted all four quarterly updates, you do one final sign-off that pulls everything together.

This is where you:

• Confirm that your quarterly figures are accurate (or make corrections — HMRC expects some adjustments)
• Report Box 44, your residential mortgage interest, for the Section 24 credit calculation
• Claim Box 36 — replacement of domestic items relief, like swapping out a washing machine for a tenant
• Pull in income from other sources if you have them: employment, dividends, pensions
• Apply your personal allowance and any other reliefs you're entitled to

For the 2026-27 tax year, the Final Declaration is due by 31 January 2028 — same deadline as the old Self Assessment. At least that part hasn't changed.

6. What software you need

Here's something that catches a lot of landlords off guard: you can't just log into HMRC's website and type your numbers in. That option is gone for MTD. You must use third-party software that's been recognised by HMRC and connects to their systems directly.

A spreadsheet on its own won't cut it either. Whatever software you choose needs to be able to:

• Hold your digital records — not just export them, but store them properly
• Talk to HMRC's servers through their official connection (the software handles this behind the scenes)
• Submit your quarterly updates and Final Declaration electronically
• Pull down your obligations — basically, which quarters HMRC is expecting you to file
• Show you the tax calculation HMRC sends back after each submission

If you want to see what's available, HMRC maintains a list of compatible software on GOV.UK.

Fineproof was built specifically for this. It connects to your bank through Open Banking, automatically sorts your transactions into the right SA105 boxes, and lets you submit your quarterly return to HMRC with a single click. No spreadsheets, no manual data entry, no chasing your accountant for a deadline that's three days away.

7. Penalties for late filing

HMRC scrapped the old flat-rate penalty system when MTD came in. What replaced it is a points-based system — think of it like penalty points on your driving licence, except these ones come with fines attached.

How the points stack up

1. Every quarterly update you file late earns you one penalty point
2. Hit 4 points and you get a £200 fine — that's the threshold for quarterly obligations, so it takes a full year of missed deadlines to trigger it
3. After that, every additional late return costs another £200 straight away
4. The good news? Points do expire — but only after 24 months of clean behaviour, meaning you haven't missed a single deadline in that period

Late payment penalties

On top of all that, HMRC charges interest on late payments at the Bank of England base rate plus 2.5%. At current rates, that's not trivial.

8. MTD for limited companies

If you own your rental properties through a limited company, you can stop worrying — for now, at least. MTD for Income Tax doesn't apply to Ltd companies. Your company pays Corporation Tax, which is a completely separate regime. HMRC has plans for MTD for Corporation Tax eventually, but that's a different programme with its own timeline.

MTD ITSA only affects you if you own property personally (or through a partnership) and file a Self Assessment return. If you've got a mix — say, some properties in your own name and others in a company — then only the personal ones fall under MTD.

9. How to file your first quarterly return

Enough theory. Here's what the actual process looks like if you're using Fineproof:

1. Sign up and connect your bank. Fineproof uses Open Banking — it's FCA-regulated and read-only, so it can see your transactions but can't move any money. Your rental income and expenses pull through automatically.
2. Check how we've categorised everything. Each transaction gets mapped to an SA105 box: rent to Box 20, buildings insurance to Box 24, letting agent invoices to Box 27, and so on. Most landlords find they only need to tweak a handful of items. You're always in control of the final categorisation.
3. Connect to HMRC. You'll link your Government Gateway account through a secure connection. This authorises Fineproof to file on your behalf — you can revoke it any time.
4. Review your Q1 summary. You'll see your income and expense totals for the quarter, and the Section 24 tax credit is calculated automatically so you know the full picture before you hit submit.
5. Hit submit. That's it. Fineproof sends the quarterly update to HMRC and you get a timestamped confirmation back within seconds.

Made a mistake? Don't panic. You can resubmit the same quarter with corrected figures at any point before the Final Declaration. HMRC always uses the most recent submission, so there's no harm in updating.

10. Frequently asked questions

When does Making Tax Digital start for landlords?

It went live on 6 April 2026. If you're a landlord or self-employed individual with gross income over £50,000, you're in the first wave. No opt-out.

What is the first MTD quarterly deadline?

7 August 2026 — that covers Q1, running from 6 April to 5 July 2026. Roughly four months from when MTD launched.

Do I need MTD if my rental income is below £50,000?

Not yet. But the threshold drops to £30,000 from April 2027, and there's a further reduction to £20,000 pencilled in for April 2028 (though that one still needs to pass through Parliament). If you're anywhere near these numbers, it's worth getting set up early.

Do limited companies need to use MTD for Income Tax?

No — Ltd companies pay Corporation Tax, not Income Tax, so they're outside MTD ITSA entirely. Only individuals and partnerships who file Self Assessment are affected.

What happens if I miss an MTD deadline?

You'll pick up a penalty point. Miss four deadlines in a year and that turns into a £200 fine, with another £200 for each subsequent late return. The points take 24 months of perfect filing to clear — think of it like points on your driving licence.

Can I use a spreadsheet for MTD?

Only if it's connected to HMRC through bridging software that handles the submission for you. A standalone Excel file sitting on your desktop doesn't count — the data has to reach HMRC digitally through recognised software.

What's the difference between a quarterly update and the Final Declaration?

Quarterly updates are your running year-to-date income and expense totals. The Final Declaration is where everything else gets added: mortgage interest for Section 24, replacement of domestic items, income from other sources, and your personal allowance. It's basically the replacement for your old annual Self Assessment return, due 31 January.

Can I correct a mistake after submitting?

Yes. You can resubmit any quarter with updated figures right up until the Final Declaration. HMRC only looks at the latest submission for each period, so there's no permanent record of the mistake.

This article is for informational purposes only and doesn't constitute tax or legal advice. Always check the latest requirements on GOV.UK and speak to a qualified tax adviser about your specific situation.