Plenty of landlords don't only let property. You might fix boilers during the week and rent out a flat on the side, run a hairdressing chair, do freelance design or sell on a market stall, and also collect rent from a buy-to-let.
If that describes you, Making Tax Digital can look doubly confusing. Two income streams, two sets of rules? Not quite. MTD has a logical way of handling this, and once you see how the numbers fit together it becomes manageable.
The threshold looks at everything together
Start with how you get pulled into MTD at all.
MTD for Income Tax is being phased in by what HMRC calls your qualifying income. That is your gross income, turnover before you take off any expenses, across both self-employment and property combined.
The dates are:
- over £50,000: from 6 April 2026
- over £30,000: from 6 April 2027
- over £20,000: from 6 April 2028
Below £20,000, you are not required to join yet.
The word that matters is combined. People often assume each income source is measured on its own, so they relax because neither their business nor their rent tops the threshold by itself. That is a costly misunderstanding.
A worked example: James the plumber
Say James runs a plumbing business and also lets out a one-bedroom flat.
- Her plumbing turnover is £38,000 a year, before van costs, materials, anything.
- Her flat brings in £14,400 a year in rent, before letting fees, repairs or insurance.
Looked at separately, neither figure crosses £50,000. But MTD does not look at them separately. It adds them:
£38,000 + £14,400 = £52,400 of qualifying income.
That is over £50,000, so James is in the first wave and needs to follow MTD from 6 April 2026. If she had only glanced at each stream on its own, she would have been caught out.
Note we used the gross figures. James's taxable profit might be far lower after expenses, but the threshold does not care about profit. It is turnover that counts. You can read more in our guide to MTD income thresholds.
Two streams, two sets of records, one rhythm
Once you are in MTD, you keep digital records of income and expenses, send HMRC four quarterly updates a year, and finish with one tax return after the tax year ends. Together these replace the old Self Assessment return for that income.
The part that trips people up: self-employment and property are treated as separate sources within MTD. So James keeps her plumbing income and expenses in one place, and her rental income and expenses in another. They do not get mixed into a single pot.
The timing, though, is shared. Both sources follow the same quarterly periods, ending 5 July, 5 October, 5 January and 5 April, with updates due by 7 August, 7 November, 7 February and 7 May. You are not juggling two calendars, just submitting figures for each source on the same dates.
From 2025-26 onwards those quarterly updates are cumulative, meaning each one is a running year-to-date total rather than a standalone three months. If you made a mistake earlier in the year, the next update corrects it. Our guide to MTD deadlines lays the dates out in full.
How a quarter actually looks for James
By the second quarter, the period ending 5 October, James's cumulative position might be:
Plumbing
- Income to date: £19,000
- Expenses to date: £6,200
Property
- Income to date: £7,200
- Expenses to date: £1,400
She submits both sets of year-to-date totals by 7 November. Two sources, one deadline, no separate Self Assessment form for either. When the tax year closes, she ties everything together with a tax return, due by 31 January following the end of the tax year, the same date Self Assessment always used.
That tax return is where you confirm the full picture, add anything outside MTD such as savings interest or dividends, claim reliefs, and tell HMRC the figures are correct. If you have income beyond business and property, our guide on MTD when you have other income is worth a look.
What about a jointly owned flat?
A quick note if your property is shared. Jointly owned rental income is split by ownership share, and the threshold is measured per person. So if James owned that flat 50/50 with her partner, only her half of the £14,400, which is £7,200, would count towards her qualifying income.
That changes her sum: £38,000 + £7,200 = £45,200, which is under £50,000. She would then fall into a later wave depending on where she lands against the £30,000 and £20,000 thresholds in following years.
Do you need an accountant for this?
Mixed income makes people reach for the phone to an accountant, which is a reasonable choice. It is not compulsory. The mechanics are repetitive once set up: record as you go, check the quarterly totals, submit.
Software like Quarterwise keeps your property records tidy and files your quarterly updates and tax return to HMRC, built for landlords rather than accountants. If you prefer professional help, you can still work alongside an accountant using the same digital records.
The point to hold onto is not to measure your streams in isolation. Add them up, check the date, and keep records little and often.
This is general information, not tax advice. Always check your own position with HMRC or a qualified accountant.
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