I sold a lot but only made a small gain
The situation
Casey had £55,000 of disposal proceeds but net gains of £800 after losses and pooling.
Quick answer
You may still need to report on SA108 if total proceeds exceed £50,000 even when gains are below the £3,000 allowance.
What to do
- Complete SA108 crypto boxes with proceeds and gains
- Keep full working papers
- File Self Assessment if proceeds threshold met
Not financial or tax advice. Updated June 2026.