Hollymollymille

Can’t anyone help please.

I’m looking for some advice on the subject about. An investment property was sold last yr with about a 20k loss, may 23. This has not been reported in the tax return as tax return hasn’t yet been done. Sold another property this tax yr which has made profit. Would like to offset last years loss on this years profit, but the capital gain it has to be paid within 60 days and previous year year to be reported, so how is this done without having to submit last tax years full accounts early. Thank you.