MTD ITSA Quarterly Reporting: Avoid Errors and Late Penalties

What MTD ITSA Means for Sole Traders and Freelancers

From April 2026, sole traders and freelancers with qualifying income above £50,000 are required to use Making Tax Digital for Income Tax Self Assessment (MTD ITSA). If your combined income from self-employment and property is above this threshold, you must keep digital records and submit quarterly updates to HMRC using compatible software. Those with income above £30,000 will follow from April 2027.

This replaces the single annual Self Assessment tax return for reporting trading income. Understanding the new rhythm of deadlines is the first step to avoiding penalties.

Key Quarterly Deadlines You Must Not Miss

Each tax year is divided into four quarterly reporting periods. The submission deadlines for each period are as follows:

• Quarter 1 (6 April to 5 July): deadline 7 August
• Quarter 2 (6 July to 5 October): deadline 7 November
• Quarter 3 (6 October to 5 January): deadline 7 February
• Quarter 4 (6 January to 5 April): deadline 7 May

After the four quarterly updates, you must also submit an End of Period Statement (EOPS) and a Final Declaration by 31 January following the end of the tax year. Think of the Final Declaration as the replacement for your old Self Assessment return, where you confirm all income and claim any reliefs.

Common Filing Errors to Avoid

Many early filers are making avoidable mistakes. Here are the most common errors and how to prevent them:

• Submitting figures that do not reconcile with your bookkeeping software: Always reconcile your bank transactions against your software totals before submitting. A mismatch can trigger HMRC queries.
• Categorising expenses incorrectly: Putting personal costs through as business expenses, or miscoding allowable expenses, can distort your profits. Use HMRC's expense categories consistently every quarter.
• Missing the cumulative nature of quarterly updates: Your quarterly submissions report cumulative income and expenses for the year to date, not just that quarter in isolation. Check your software is set up to report correctly.
• Forgetting to include all income sources: If you have both self-employment income and rental income, both must be reported through MTD ITSA. Missing a source is a common oversight.
• Using non-compatible software: Only HMRC-recognised MTD ITSA software can be used to submit. Spreadsheets alone are not sufficient unless linked to a bridging tool that is also HMRC-approved.

Understanding the New Penalty Regime

HMRC has introduced a points-based late submission penalty system for MTD ITSA. Each missed quarterly deadline earns you one penalty point. Once you reach a threshold of four points, you receive a £200 financial penalty. Further missed submissions after that threshold each attract an additional £200 penalty.

Points expire after 24 months, provided you have been fully compliant during that period. This means consistent late filing does not reset easily. Separate late payment penalties also apply to any tax paid after the 31 January deadline, starting at 2% of the outstanding amount after 15 days and rising further after 30 days.

Practical Steps to Stay Compliant

• Set calendar reminders for each of the four quarterly deadlines and the Final Declaration at least two weeks in advance.
• Reconcile your accounts monthly so that quarterly submissions are straightforward rather than a last-minute scramble.
• Choose the right software early and ensure it is on HMRC's list of compatible MTD ITSA products.
• Review each submission before sending to check totals look reasonable compared to the previous quarter.
• Speak to your accountant or tax adviser before your first submission if you are unsure about expense categories or income classification.

MTD ITSA requires a more disciplined approach to record-keeping than many freelancers are used to, but building good habits now will protect you from penalties and make the Final Declaration straightforward at year end.