If you’re a sole trader or landlord with gross income over £50,000, 5 July 2026 was a date you needed to know about. It marked the end of the very first reporting quarter under Making Tax Digital for Income Tax Self Assessment (MTD ITSA) — the scheme that replaces the old once-a-year tax return with quarterly digital updates sent straight to HMRC. For everyone in scope, the clock started ticking back on 6 April, and the first update covering that period is now due.

This isn’t a future reform to keep half an eye on. For an estimated hundreds of thousands of UK sole traders and landlords, it’s now simply how tax works, and missing a beat means missing a legal obligation, not just a best practice.

Who this actually catches

The £50,000 threshold is based on gross income — your total turnover or rental income before any expenses come off — not your profit. That catches a lot of businesses that don’t think of themselves as big enough to worry about, particularly landlords with a couple of higher-value properties, or freelancers and consultants billing well but with high costs. HMRC does not automatically move you into MTD; you have to register and set yourself up before your first deadline arrives, so it’s entirely possible to be legally required to comply and not yet be doing it.

What you need in place now

Under MTD ITSA you keep digital records of income and expenses throughout the year using MTD-compatible software, and you submit a quarterly update at least every three months — this isn’t a rough estimate, it’s built from real transaction data. A final digital return is still due by the following 31 January, so quarterly updates don’t replace the annual process, they sit on top of it.

The practical challenge for most small business owners isn’t the accounting itself — it’s the plumbing. Spreadsheets and shoebox receipts no longer satisfy the requirement; you need software that talks to HMRC directly, or a bridging tool that connects your existing records to a compliant format. This is exactly the kind of unglamorous but essential integration work firms like BuildApps and CoolCoding handle for small businesses that would rather not become part-time systems administrators on top of running their actual business.

The mistake to avoid

The most common error so far isn’t getting the numbers wrong — it’s assuming the deadline is further away than it is, or that a good accountant will simply “sort it” without any change to how records are kept day to day. Quarterly updates depend on transactions being logged consistently through the quarter, not reconstructed from memory the week before submission. If your bookkeeping habits haven’t changed to match the new cadence, the next deadline will arrive exactly as suddenly as this one may have.

It’s also worth checking your software actually does what HMRC requires. Not every accounting tool marketed as “MTD-ready” handles the full quarterly submission process — some only manage VAT, which has been mandatory for longer and is a separate regime from Income Tax. If you’re unsure, check your software provider’s own MTD ITSA compatibility statement rather than assuming a VAT-ready badge covers you.

What happens if you miss it

HMRC’s stated approach during this first year is to focus on support and light-touch guidance rather than immediate penalties, but that leniency is not indefinite and shouldn’t be relied on as a plan. Persistent late or missing quarterly updates will eventually trigger the same points-based penalty system already used for VAT, where repeated misses accumulate toward a fine rather than triggering one immediately. The safer approach is to treat the quarterly cycle as a genuine deadline from the start, not a formality to catch up on once the penalties start biting.

The takeaway

If you’re a sole trader or landlord anywhere near the £50,000 threshold, don’t wait for a letter from HMRC to confirm you’re affected — check now, register if you haven’t, and get compatible software properly connected before the next quarter closes. The businesses who treat this as routine admin from day one will barely notice it. The ones who treat it as someone else’s problem are the ones who’ll be scrambling every three months from here on.