The short version: SA108 is the capital gains supplementary form. You use it to report profits (or losses) from selling property, shares, crypto, or other assets.
When do you need it?
If your total gains are above the annual CGT allowance, you sold residential property (which has separate reporting requirements), or you want to report losses to carry forward.
What goes on it?
Details of each disposal: what you sold, when, what you paid, what you received, and any reliefs you’re claiming. The form calculates your total gain and tax due.
Filing online?
Capital gains sections are built into the online return. For property sales, remember you also need to report through the Real Time CGT Service within 60 days.
Sold assets and need to report the gains? We can calculate what you owe.
