For most landlords, tax used to be one event a year: a Self Assessment return in January, cobbled together from a shoebox of receipts. That era is ending. Making Tax Digital (MTD) for Income Tax replaces the single annual return with four quarterly updates plus a final declaration, all filed from software — and for many landlords it’s already live.
The first wave is in it now: MTD became mandatory from April 2026 for anyone whose qualifying income tops £50,000, the first quarterly deadline (7 August) has already passed, and the next falls on 7 November. The second wave is watching nervously, because from April 2027 the threshold drops to £30,000 — and to £20,000 in April 2028.
General information, not tax advice. Thresholds and dates are set by HMRC and the figures below are illustrative examples. Your own obligation depends on your total qualifying income and how you hold your properties. Check the official guidance: GOV.UK — Find out if and when you need to use Making Tax Digital for Income Tax.
If you’re still working out whether a property even clears the bar, our rental yield calculator gives you the pre-tax picture in a minute. This article is about what happens after: keeping the records HMRC now demands, quarter after quarter, without it eating a weekend each time.
First, are you actually in it?
The trap is thinking the threshold is per property. It isn’t. MTD looks at your total qualifying income — gross rental income across all your properties plus any sole-trader self-employment income — before expenses.
- Four flats at £1,200/month = £57,600 gross → over £50,000 → in from April 2026.
- One flat at £14,400 a year plus £20,000 of freelance income = £34,400 → under £50k today, but over £30,000 → in from April 2027.
It’s gross, and it’s combined. A modest portfolio that never felt like “a business” can be squarely inside the regime.
The five mistakes landlords made in quarter one
1. Reconstructing the quarter at the deadline
The whole point of MTD is contemporaneous digital records. The landlords who struggled were the ones who treated the 7 August deadline like the old January scramble — three months of bank statements to sort in one sitting. The fix is boring and total: record each income and expense when it happens, not when the deadline looms.
2. Not separating income and expenses by property
A quarterly update is a summary of totals, but you can only trust the total if the underlying entries are clean. Mixing the boiler repair on Flat A with the service charge on Flat B turns reconciliation into detective work. Keep every transaction tagged to the property it belongs to from the start.
3. Miscategorising expenses
MTD doesn’t change what’s deductible — it just makes you report more often, so a wrong category now shows up four times a year instead of once. The repairs-vs-improvements line and the Section 24 mortgage-interest rule still decide your bill; MTD just gives you four chances to get the category wrong. Get the categories right once, at entry.
4. Assuming the spreadsheet is enough
A spreadsheet can be MTD-compatible only through bridging software that files it digitally — a manual copy-paste into HMRC’s site is not compliant. Many landlords discovered in July that “I’ve got a spreadsheet” and “I can file an MTD update” are not the same sentence.
5. Reading the 12-month penalty grace as “I can ignore this”
HMRC is running a soft landing: for the first 12 months it won’t issue late-submission penalty points for the quarterly updates. That is not a holiday. It doesn’t cover your end-of-year obligations, and it ends — building the quarterly habit now, while the penalties are paused, is exactly the point of the grace period.
The calendar to lock in
The quarterly deadlines are fixed dates, the same every year regardless of when your accounting period starts:
| Quarter | Period covered | Filing deadline |
|---|---|---|
| Q1 | 6 Apr – 5 Jul | 7 August |
| Q2 | 6 Jul – 5 Oct | 7 November |
| Q3 | 6 Oct – 5 Jan | 7 February |
| Q4 | 6 Jan – 5 Apr | 7 May |
| Final Declaration | Full tax year | 31 January (following year) |
Five filings where there used to be one. The Final Declaration on 31 January is where you confirm the year, claim reliefs and settle up — it replaces the old Self Assessment return, but it now sits on top of four updates you’ve already sent.
What your system actually has to do
Strip away the jargon and MTD requires three things of your records:
- Digital from the point of entry — each transaction captured in software, not on paper first.
- Categorised and per-property — so a quarterly summary is a button, not a project.
- Filed digitally — through MTD-compatible software, direct to HMRC.
That’s precisely the record you should be keeping anyway to know whether a property is actually making money — which is why the gap between projected and real yield closes the moment you track income and expenses as they happen.
What matters
MTD doesn’t raise your tax — but it turns record-keeping from a once-a-year sprint into a standing discipline, and it penalises the landlords who leave it to the deadline. The threshold is on your combined gross income, the deadlines are fixed (7 Aug, 7 Nov, 7 Feb, 7 May), and the grace period ends. Every one of the quarter-one mistakes has the same root and the same fix: capture each transaction, tagged to its property, the day it happens.
Do that and the quarterly update stops being an event. If you’d rather have every income and expense already recorded per property and per category, ready to summarise on the 7th instead of reconstructed from memory, take a look at Livra.