Quick answer
The final declaration confirms your figures for the whole tax year, adds any other income and reliefs, and replaces the Self Assessment tax return. It’s due by 31 January after the tax year ends.
What it is
The final declaration is the last step of each MTD year. It confirms your figures for the whole tax year and replaces the Self Assessment tax return for anyone in MTD for Income Tax.
When it’s due
By 31 January after the tax year ends. For 2026/27, that’s 31 January 2028. That’s also when any remaining tax for the year is due.
What goes into it
confirmation that your business figures for the year are complete and correct
year-end adjustments, such as capital allowances and private use
other income, such as employment, pensions, dividends and savings interest
reliefs and allowances, such as pension contributions and Gift Aid
Your software combines this with your quarterly updates, calculates your tax, and you submit it.
No end of period statement
An earlier version of MTD planned a separate ‘end of period statement’ for each business. HMRC dropped it, so the final declaration is the only year-end submission.
Can my accountant do it?
Yes. Many people keep their own records during the year and have an accountant review everything and submit the final declaration.