Carry forward of loss from 2020-21 Sole Trader

I have a loss of £1651 from 2020-21 to use against a net profit of £370 in the 2021-22 tax year. When using the online self assessment form I enter £370 in the appropriate box, however, the form does not accept this amount. How do I do this so that I can submit my form? Thank you

Hi,

It may just be an advisory message that you are getting, so just save and continue.

Thank you.