What MTD ITSA Actually Requires — Not Just the Headline
Most people have heard that MTD ITSA is coming. Fewer understand what it actually demands in practice. Here is the full picture.
Under MTD ITSA, from 6 April 2026, sole traders and landlords with qualifying income above £50,000 must:
- Keep digital records of every income and expense transaction in HMRC-compatible software
- Submit quarterly updates to HMRC within one month of each quarter end (31 July, 31 October, 31 January, 30 April)
- Submit a final declaration by 31 January following the tax year, replacing the current self-assessment return
- Maintain an unbroken digital link between source records and each submission — no manual re-keying of totals
The quarterly submissions are cumulative summaries of income and expenses — not full accounts. HMRC uses them to estimate your tax liability and send you an in-year calculation. The final declaration reconciles the full year, allows you to include other income sources, and triggers the actual tax bill.
The Mandate Timeline
| Date | Who must comply | |---|---| | 6 April 2026 | Sole traders and landlords with qualifying income > £50,000 | | 6 April 2027 | Income > £30,000 | | TBC | Income > £20,000 (announced but date not confirmed) | | TBC | Partnerships (not yet announced) |
Qualifying income means self-employment turnover plus UK property income. Employment income (PAYE), pensions, and savings interest do not count towards the threshold. If your income fluctuates around the threshold, HMRC assesses you based on the previous tax year.
What Counts as a Digital Link?
HMRC's digital link rule is one of the most misunderstood parts of MTD. A digital link is an automatic electronic transfer of data — not a manual copy-paste or re-keying. If you use a spreadsheet to track income and a different system to submit, you must have a formula, API, or import connection between them. Typing numbers from one system into another breaks the digital link and is non-compliant.
Compatible MTD ITSA software maintains the digital link automatically — you record transactions and the software submits them directly to HMRC via the MTD API. This is what HMRC means by "digital records maintained in software that is capable of submitting directly to HMRC."
Your 5-Step Action Plan
Step 1: Confirm your income level. Add up your self-employment turnover and UK property income for 2024/25. If the total exceeds £50,000, you are mandated from April 2026. If it is between £30,000 and £50,000, you have until April 2027 but should start now.
Step 2: Register for Self Assessment (if not already). MTD ITSA is built on the Self Assessment infrastructure. If you have not yet registered, do so immediately via HMRC's online service. Processing takes up to 6 weeks.
Step 3: Choose HMRC-compatible software. Not all accounting tools support MTD ITSA — many are still in testing or have only sandbox approval. AccLedger has full production MTD ITSA credentials from HMRC and can handle quarterly submissions and final declarations for sole traders and landlords. Confirm your chosen software has live (not just test environment) MTD ITSA approval before the April deadline.
Step 4: Migrate your records to digital. If you currently keep records on paper or spreadsheets, start transferring them to your chosen software now. You need a complete digital record from 6 April 2026 — ideally earlier so you are comfortable with the process before the first quarterly deadline.
Step 5: Understand the quarterly calendar. Your first quarterly submission under MTD ITSA (for the quarter to 5 July 2026) is due by 5 August 2026. Set calendar reminders for all four quarterly deadlines plus the final declaration by 31 January 2027.
What Happens if You Miss the Deadline?
HMRC has introduced a points-based penalty system for late MTD ITSA submissions, similar to the VAT penalty regime introduced in 2023. Each missed quarterly submission earns a penalty point; at four points you receive a £200 financial penalty. The points reset once you have filed four consecutive on-time returns. HMRC has indicated a soft-landing period for 2026, but depending on this is risky — the regime is in place and will be enforced.
Check Your Readiness Now
The MTD ITSA readiness checker on AccLedger takes five minutes and gives you a personalised compliance score with a specific action plan based on your current situation.
AccLedger is one of the few platforms with full production MTD ITSA credentials from HMRC, covering quarterly submissions, final declarations, and all required digital links between your records and HMRC's systems.