You let out a property and run a small business on the side. Maybe you're a landlord who also does consultancy, or a tradesperson with a buy-to-let. The question that keeps coming up is simple: do those two income streams get added together for Making Tax Digital, or are they judged separately?
The short answer is both, and that catches people out. Your rent and your self-employment income are added together to test whether you're in scope for Making Tax Digital for Income Tax. But once you're in, you report each one separately. One test, two sets of records.
This guide is for landlords with a sole-trade side business (and sole traders who've picked up a rental). We'll show you exactly how the threshold is worked out, what you actually have to file and when, and a worked example so you can see whether you're caught. Every rule here is checked against the current HMRC guidance, and we've linked the gov.uk pages at the end.
How is MTD qualifying income worked out for a landlord with a side business?
Your qualifying income is the total gross income you receive in a tax year from self-employment and property combined, before you deduct any expenses. If that combined figure is over the threshold for the relevant phase, you're in scope for Making Tax Digital for Income Tax.
The key word is gross. HMRC assesses your turnover, not your profit. So a landlord whose rent barely breaks even after the mortgage and a sole trader running on thin margins can both still be caught, because it's the income coming in that counts, not what's left after costs.
And it's aggregated. HMRC's own example puts it plainly: £25,000 of rental income plus £27,000 of self-employment income gives total qualifying income of £52,000 (gov.uk). Neither stream is over £50,000 on its own, but together they clear it, so that person is in scope. This is the single most common misunderstanding we see among landlords with a side business: they look at each source in isolation and assume they're under the line.
What counts towards the threshold, and what doesn't?
Only income from self-employment and property feeds the qualifying income test. Other income you report through Self Assessment does not.
| Counts towards qualifying income | Does not count towards qualifying income |
|---|---|
| Gross self-employment turnover | Employment income (PAYE / salary) |
| Gross UK property (rental) income | Your share of partnership profit as an individual partner |
| Gross foreign property income | Dividends (including from your own company) |
| State Pension and private pensions |
Source: gov.uk - work out your qualifying income.
So if you also have a day job, that salary does not push you towards the threshold. The same goes for dividends from your own limited company and your pension. They sit outside the test.
There's an important catch, though. Income that doesn't count towards the threshold can still need reporting. Once you're inside MTD because your self-employment and property income tip you over, your employment and pension income is still picked up at the final declaration stage, the same way it would have appeared on your Self Assessment return. The threshold test and the reporting requirement are two different things.
When does MTD for Income Tax start for me?
Making Tax Digital for Income Tax is being phased in by income level. The date you join depends on which threshold your combined qualifying income crosses, and HMRC checks it against a specific past tax year.
| Combined qualifying income over | You must use MTD from | Based on your income in |
|---|---|---|
| £50,000 | 6 April 2026 | 2024/25 |
| £30,000 | 6 April 2027 | 2025/26 |
| £20,000 | 6 April 2028 | 2026/27 |
Source: gov.uk - check if you're eligible for MTD for Income Tax.
HMRC reviews the qualifying income on your Self Assessment return each year. If, say, your combined self-employment and property income for 2024/25 was over £50,000, HMRC writes to you and you must use the service from 6 April 2026. The first phase, for income over £50,000, is live now.
Because the test looks back at a completed tax year, you can work out today whether you'll be mandated. Add up your gross self-employment turnover and your gross rental income for the relevant year, and compare it to the threshold.
Illustrative example: a landlord with a consultancy side business
Illustrative example. Priya is a landlord who also does freelance marketing consultancy. In the 2024/25 tax year her gross income was:
| Income source | Gross income (2024/25) |
|---|---|
| Rental income from one UK flat | £22,000 |
| Freelance consultancy turnover | £31,000 |
| Combined qualifying income | £53,000 |
Priya also earns £18,000 from a part-time employed role. That salary is taxed under PAYE and does not count towards her qualifying income.
Her property income alone (£22,000) and her consultancy alone (£31,000) are each under £50,000. Looked at separately, she might assume she's outside MTD. But the test aggregates the two: £22,000 plus £31,000 is £53,000, which is over the £50,000 threshold for the first phase.
So Priya is mandated into Making Tax Digital for Income Tax from 6 April 2026. From the 2026/27 tax year onward she keeps digital records and sends quarterly updates. Her £18,000 salary still doesn't move the threshold, but it's reported at her final declaration alongside everything else.
The arithmetic check: £22,000 + £31,000 = £53,000 (qualifying income, over £50,000, so in scope). The £18,000 PAYE salary is excluded from that test but included at final declaration. Figures are illustrative.
If both incomes combine, do I file one return or two?
Here's where the "one test, two sets of records" point really matters. Although your income is combined to decide whether you're in MTD, you report each business separately once you're in.
You send a separate set of quarterly updates for each self-employment and for your property business (gov.uk). So Priya, from our example, would keep digital records and send quarterly updates for two things:
- Her consultancy (one self-employment business).
- Her property letting (one property business).
A few rules on what counts as one business:
- All your UK property is a single property business. If Priya buys a second UK flat, both flats are still just one UK property business, reported together.
- UK property and foreign property are separate businesses. If she let a holiday home in Spain as well, that would be a second, separate property business with its own quarterly updates.
- Each separate trade is its own self-employment. If she ran a second, genuinely distinct trade, that would be reported separately too.
If you're a landlord who's never had to think about your lettings as a formal "business" before, our guide for landlords walks through how Zmartly handles property bookkeeping and reporting.
What are the quarterly update deadlines?
A quarterly update is a cumulative summary of your income and expenses for that business, sent through compatible software. It is not a mini tax return, and it isn't four separate three-month snapshots.
Each update covers from the start of the tax year up to the end of that quarter, not just the previous three months (gov.uk). So the second update restates the year to date including the first quarter, the third update includes the first two, and so on. If you got a figure wrong in an earlier quarter, the next cumulative update simply corrects it.
The standard quarterly periods and deadlines are:
| Quarter | Period covered | Deadline |
|---|---|---|
| Q1 | 6 April to 5 July | 7 August |
| Q2 | 6 April to 5 October | 7 November |
| Q3 | 6 April to 5 January | 7 February |
| Q4 | 6 April to 5 April | 7 May |
Source: gov.uk - using MTD for Income Tax.
Remember each business has its own updates. With a sole trade and a property business, Priya sends two updates by each deadline, both cumulative year-to-date.
What about the final declaration?
After the tax year ends, you make a final declaration. This replaces the Self Assessment return you're used to and is due by 31 January after the end of the tax year (gov.uk).
The final declaration is where the whole picture comes together. You confirm your business income, add any other income that doesn't go through quarterly updates (employment, pensions, dividends, savings interest), and claim your reliefs and allowances. It's the point at which your final tax position for the year is settled.
So for a landlord with a side business, the rhythm is: quarterly updates through the year for the trade and the property, then one final declaration that pulls everything in, including the PAYE salary that never counted towards the threshold. If you'd like a hand getting that final declaration right, our Self Assessment service covers exactly this transition.
What records and software do I need?
MTD requires you to keep digital records of your business income and expenses and to file through compatible software. You can no longer keep a shoebox of receipts and a manual ledger as your primary record.
There must also be digital links between the parts of your record-keeping. In plain terms, data has to flow from one piece of software to the next without manual copy-paste or retyping. If you keep your figures in a spreadsheet, that's allowed, but you'll need bridging software to connect the spreadsheet to HMRC so the link stays digital.
We'd avoid naming specific products here. HMRC maintains a live list of software that works with Making Tax Digital for Income Tax, and the right choice depends on whether you want spreadsheet-plus-bridging or an all-in-one package. The important compliance point is the digital link: no manual transfer between programs.
What happens if I miss a deadline?
HMRC is using a points-based system for late submissions under MTD. You get a penalty point each time you miss a quarterly update or final declaration deadline. For quarterly filers, once you reach 4 points you get a £200 penalty, and a further £200 each time you miss another deadline after that (gov.uk).
Worth knowing: there are no penalties for missing a quarterly update deadline in the 2026/27 tax year. Quarterly-update penalties start from 2027/28 onward (gov.uk).
Late payment of tax is penalised separately. For 2026/27, HMRC's stated structure is: no penalty if you pay within 15 days; from day 16 to 30 a penalty of 3% of the tax owed at day 15 (waived if it's your first year); and from day 31, 3% of the tax owed at day 15 plus 3% of the tax owed at day 30, plus an annualised rate of 10% charged daily on the outstanding amount until you pay, for up to 2 years (gov.uk). A Time to Pay arrangement with HMRC can stop further late-payment penalties building up.
Frequently asked questions
Does my rental income get added to my self-employment income for MTD?
Yes. Your qualifying income for Making Tax Digital is the total gross income from self-employment and property combined, before expenses. If the combined figure is over the threshold for the relevant phase, you're in scope, even if neither source is over the threshold on its own.
My salary is over £50,000. Does that put me into MTD?
No. Employment income taxed under PAYE does not count towards your qualifying income for the MTD threshold. Only self-employment and property income are tested. Your salary is still reported, but at the final declaration stage, not as part of the threshold test.
If I'm caught, do I file one combined return or separate reports?
You file separately. Combined income decides whether you're in MTD, but once in, you send a separate set of cumulative quarterly updates for each self-employment and for your property business. They're brought together only at the final declaration.
Are my two rental properties two businesses for MTD?
No. All your UK property is treated as a single property business and reported together, however many UK properties you own. UK property and foreign property are separate businesses, so an overseas let would be reported on its own.
When do quarterly updates have to be sent?
The standard deadlines are 7 August, 7 November, 7 February and 7 May. Each update is cumulative, covering from the start of the tax year to the end of that quarter, not just the previous three months.
Does the final declaration replace my Self Assessment tax return?
Yes. Under MTD for Income Tax, a final declaration replaces the Self Assessment return. It's due by 31 January after the end of the tax year and is where you confirm all your income, claim reliefs and allowances, and settle your final tax position.
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Talk to Zmartly about getting MTD-ready
If you're a landlord with a side business, the combined-income rule means you may be in scope sooner than you'd expect. We can check your qualifying income, set up compliant digital records for both your trade and your property, and handle your quarterly updates and final declaration so nothing slips. Book a free call with a Zmartly accountant and we'll map out exactly what MTD means for you.
