Self-assessment checklist
The tax return filing deadline is 31 January following the end of each tax year. Use our checklist to reduce the chances of making any errors.
Tax returns
Self-assessment is the current method of reporting your income and capital gains to HMRC each year. It is easy to make mistakes, especially if you are unable to file the return until near the deadline of 31 January. Common mistakes include:
- missing income sources
- missing capital gains
- underclaiming tax reliefs
- not reporting pension contributions or liability to the annual pension charge
- believing the return to be filed when it isn’t successfully lodged with HMRC.
Making any of these errors can lead to penalties and/or interest. Use our Self-assessment Checklist to help ensure you’ve done everything to minimise errors.
Related Topics
-
September deadline to opt out of winter fuel payment
Pensioners whose income is over £35,000 have only days left to opt out of the 2026/27 Winter Fuel Payment and avoid having it recovered through the tax system. What do you need to know?
-
Electronic VAT return and payment due
-
Alternative education providers can protect VAT refund claims
HMRC has confirmed that some alternative providers of higher and further education can submit VAT refund claims following a Court of Appeal ruling, despite HMRC appealing the decision to the Supreme Court. What do you need to know?



This website uses both its own and third-party cookies to analyze our services and navigation on our website in order to improve its contents (analytical purposes: measure visits and sources of web traffic). The legal basis is the consent of the user, except in the case of basic cookies, which are essential to navigate this website.