Self assessment tax deposit in wrong assessment year

This discussion addresses an individual who mistakenly paid their Self Assessment income tax for the 2020-21 tax year instead of the intended 2023-24 year. While the HMRC portal offers a 'challan correction' option, it's noted that direct changes to the assessment year are not possible. Partial rectification may be an option if there's a change in income, but a full correction of the assessment year appears unlikely through this method.