What to know before you decide
Know the deadline and the year being reported
The UK tax year runs from 6 April to 5 April. The standard online Self Assessment deadline is 31 January following the end of that tax year; registration is generally required by 5 October where you need to tell HMRC about a new filing obligation. For 2026/27, the standard online filing date is 31 January 2028. Check any different HMRC notice or special circumstances rather than relying solely on the general date.
A tax return is not a list of bank deposits
PAYE income, self-employed fees, partnership profit and company dividends have different reporting rules. P60s, tax deducted, benefits and pension charges can affect the calculation. Reconcile fees and expenses, then compare the result with prior payments on account. A clear explanation of the tax due is as important as submitting the return itself.
Self Assessment Tax Returns for Doctors & Healthcare Professionals