Taxpayers who are due additional tax relief on their pension contributions, i.e. higher or additional rate taxpayers who are not within self-assessment, can ask HMRC to amend their PAYE code to include the tax relief. Prior to 1 September 2025, only some of these taxpayers were required to provide evidence of the contributions made. Since 1 September, HMRC will only accept claims made using its online service or by letter and evidence must be provided to support the claim. A statement from the pension provider or payslips showing the contributions made will suffice.