MTD for Income Tax Self Assessment Explained

MTD ITSA shifts reporting from a single annual return to a continuous digital cycle: digital records throughout the year, four quarterly updates and a year-end final declaration.

Quarterly updates summarise income and expenses to date, but they are not tax calculations. The final tax liability is calculated only at the final declaration stage.

The final declaration finalises figures for each business or property source, including accounting and tax adjustments such as capital allowances or private use proportions.

The final declaration brings together all your income sources, allowances and reliefs, and confirms your final tax position for the year. It replaces the Self Assessment return for affected taxpayers.

Records of income and expenses must be kept digitally in compatible software from the point of transaction, with a digital audit trail through to the figures reported to HMRC.

Only HMRC-recognised software can be used to submit quarterly updates and your final declaration. The HMRC software list is updated regularly.

A points-based penalty system applies to late submissions, with financial penalties once the points threshold is reached.