Marriage Allowance - forgot to fill in details in SA for 20/21

Hi there, my other half is self-employed and on some occasions dependent on income (most recently for the tax year 21/22) has passed on personal tax allowance to me via the marriage allowance. We have realised that they didn't complete the relevant part of the self-assessment form for 20/21 for marriage allowance. As a result, I didn't get the marriage allowance and a subsequent rebate. Is there a way for us to rectify this retrospectively either online via the Self Assessment platform or over the telephone?

Hi Anna Brooks,

If your partner contacts our Income Tax department to apply for the transfer, we can also refer this on for 20/21 SA to be reviewed.

Income Tax: general enquiries

Thank you.