The main dates
For the tax year ending 5 April 2026, a new taxpayer normally needs to tell HMRC by 5 October 2026. Paper returns are generally due by 31 October 2026, while online returns and the balancing payment are generally due by 31 January 2027.
Payments on account can also create a second payment date on 31 July, so the January bill is not always the only amount to budget for.
Do not wait for January
Completing the return earlier gives more time to find missing records, correct tax codes, review pension information and plan for the payment. It also reduces the risk that a late bank statement or property schedule becomes a deadline emergency.
Directors, landlords and sole traders should gather records throughout the year rather than relying on email searches at the end.
What to collect
Typical records include employment documents, dividend vouchers, interest statements, pension contributions, property income and costs, self-employment records, capital transactions and details of tax already paid.
Where more than one business or property is involved, label the records clearly so figures are not mixed together.
A practical next step
Create one folder for each tax year and add documents as they arrive. Review the position during the summer or autumn so there is time to resolve missing information.
Accountants4All can provide a focused document checklist and help prepare and submit the return once the information is complete.
Official guidance
Rules and deadlines can change. Check the current official guidance and obtain advice for your circumstances.
GOV.UK: Self Assessment deadlinesNeed a clear next step?
Talk through the records, deadline or setup involved.
This article provides general information and is not personal tax, legal or financial advice.