After the fourth quarterly update has been submitted, the year-end finalisation process can be completed.

  1. Complete the tax and accounting adjustments on each MTD business and submit these to HMRC
  2. Bring together all sources of income (MTD and non-MTD income) that will be submitted to HMRC in place of the current Self-Assessment tax return. The deadline for this submission will be 31 January following the tax year.

Submitting a final declaration will be part of the new MTD for IT rules, which come into effect for self-employed people and landlords earning above £50,000 in April 2026 and those earning more than £30,000 in 2027.

There is no specific information you need to include in the final declaration itself, as it is simply a declaration statement to ‘accept’ your final tax position for the year, which is calculated by HMRC.

If we currently complete your self-assessment tax return, the final declaration will be completed by us, ensuring that you both comply with HMRC’s rules and continue to be as tax efficient as possible.