As of 6 April 2026, Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) is no longer a future concern. It is live. If you are a sole trader or landlord with gross annual income exceeding £50,000, you are now required to keep digital records and file quarterly updates with HMRC using compatible software. No more waiting. No more deferrals.
After years of delays — the original mandate was supposed to begin in April 2024 — HMRC has finally drawn the line. And while the concept has been discussed to death in accounting circles, the reality on the ground is that a significant number of affected taxpayers are still not ready. If that includes you, or your clients, the time to act is now — not in August when the first quarterly filing is due.
Who Is Affected Right Now?
Phase 1, which commenced on 6 April 2026, captures self-employed individuals and landlords whose gross income from self-employment or property exceeded £50,000 on their 2024/25 Self Assessment return. HMRC estimates this affects roughly 780,000 taxpayers in the first wave alone.
If you filed a 2024/25 return showing combined gross self-employment or property income above that threshold, you should already have received a letter from HMRC confirming you are in scope. If you have not received one, do not assume you are exempt — check your position carefully and sign up through HMRC’s MTD sign-up service without delay.
Phase 2 follows in April 2027, pulling in those with income above £30,000. Phase 3 in April 2028 lowers the bar to £20,000. The direction of travel is clear: this will eventually apply to nearly all unincorporated businesses and property landlords.
What Has Actually Changed?
Under the old Self Assessment regime, you filed one tax return per year, typically months after the tax year ended. MTD for ITSA replaces that model with something closer to real-time reporting. The key obligations are threefold.
First, you must maintain digital records of all business income and expenses using HMRC-recognised software. Spreadsheets alone no longer suffice unless they are linked to compatible bridging software. Second, you must submit quarterly updates to HMRC summarising your income and expenditure for each period. Third, at the end of the tax year, you must file a Final Declaration — effectively replacing the traditional Self Assessment return — confirming your total income and claiming any reliefs or allowances.
The quarterly update deadlines for 2026/27 are fixed. The first covers the period from 6 April to 5 July 2026 (or 30 June if you have elected for calendar quarters), and must be filed by 7 August 2026. Subsequent deadlines fall on 7 November 2026, 7 February 2027, and 7 May 2027. These are not negotiable.
The Penalty Regime: A Temporary Reprieve, Not an Amnesty
HMRC has acknowledged the transition will be difficult and has introduced a grace period — but it is narrower than many assume. For the first year of MTD for ITSA (the 2026/27 tax year), HMRC will not apply penalty points for late quarterly updates. That means missing a quarterly deadline will not immediately result in a financial penalty.
However, this grace period does not extend to the Final Declaration or to late payment of tax. If you miss your end-of-year filing or fail to pay on time, penalties will apply from day one. The new penalty regime is points-based: each missed quarterly submission earns a penalty point, and once you reach the threshold of four points, a £200 penalty is triggered for each subsequent late filing. Late payment penalties are calculated proportionally based on how long the tax remains unpaid — the longer you delay, the higher the charge.
In short, the first year offers breathing room on quarterly filings, but it is emphatically not an invitation to ignore the system. Building good habits now will prevent a painful reckoning when the full penalty regime kicks in from April 2027.
Software: What You Need and What It Costs
You cannot comply with MTD for ITSA without using HMRC-compatible software. HMRC maintains a list of recognised software providers, and the range of options has expanded considerably since the pilot phase. Established platforms such as Xero, QuickBooks, FreeAgent, and Sage all offer MTD-compatible products. For sole traders with relatively simple affairs, free or low-cost options exist. Landlords with multiple properties or those with more complex income streams will likely need a more robust solution.
The critical point is that your software must be able to categorise transactions in line with HMRC’s requirements and submit quarterly updates directly through HMRC’s Application Programming Interface. If you are currently using a basic spreadsheet or paper records, you will need to transition — and the learning curve, while manageable, is not trivial. Start now, not in July.
What CFOs and Business Owners Should Do This Week
If you run an unincorporated business or hold property that generates rental income, here is what should be on your immediate agenda.
Confirm whether you are in scope for the 2026/27 tax year. Check your 2024/25 Self Assessment return. If your gross self-employment or property income exceeded £50,000, you are caught by Phase 1. If you have not already done so, sign up for MTD for ITSA through HMRC’s portal. Do not wait for a letter.
Choose and set up your software. If you already use a cloud accounting package, check whether it supports MTD for ITSA submissions — many require an upgrade or an additional module. If you do not currently use digital accounting software, select a provider from HMRC’s approved list and begin entering your records from 6 April 2026 onwards.
Speak to your accountant. If you use an agent, confirm that they are registered to act on your behalf under MTD and that their software is compatible. Your agent can submit quarterly updates for you, but you remain responsible for maintaining accurate digital records.
Do not forget the wider tax changes that also took effect on 6 April. Dividend tax rates have risen by two percentage points across the board — the basic rate is now 10.75%, the higher rate 35.75%. The capital gains tax rate for Business Asset Disposal Relief (BADR) qualifying disposals has increased to 18%. And the previously unlimited 100% inheritance tax reliefs for agricultural and business property are now capped at a combined £2.5 million per individual, with relief dropping to 50% above that threshold. These changes deserve their own detailed consideration, but together they represent a significant shift in the tax landscape for owner-managed businesses.
The Bigger Picture
MTD for ITSA is not simply a compliance exercise. It represents a fundamental change in the relationship between taxpayers and HMRC. Real-time digital reporting gives HMRC far greater visibility into business income as it is earned, not twelve months after the fact. For taxpayers, it means fewer surprises at year-end — if your quarterly updates are accurate, your final tax bill should hold no shocks.
For advisers, the shift creates both challenges and opportunities. Clients who previously handed over a carrier bag of receipts in January will need ongoing support throughout the year. The advisory relationship becomes more continuous, more proactive, and — done well — more valuable.
The businesses that will navigate this transition smoothly are those that act now, choose the right tools, and treat quarterly reporting not as a burden but as a discipline that improves financial visibility and decision-making.
Talk to Tanous about MTD for Income Tax and the 2026/27 tax changes — contact us at tanous.co.uk.