Notes for this questionfrom What records you have to keep
Records are kept for years after the tax return is sent, because HMRC can ask to see them.
The rule used in this room: keep the records for a tax year for at least 5 years after the 31 January deadline for that year. Check GOV.UK for the current rule.
The tax year runs from 6 April to 5 April. The online return for it is due by the next 31 January.