Gemini crypto tax: how to calculate your UK CGT

Three steps

1. 1

   Export from Gemini

   Gemini’s transaction history CSV, brought in through the custom column mapper (auto-detects the columns from your headers).

2. 2

   Import into Pooled

   Drop the file into Pooled and pick the custom importer. It reads your file’s own headers and pre-fills the column mapping, so it is usually a review-and-confirm.

3. 3

   Review and read off your figures

   Any row with no GBP value (a swap, a reward) is flagged for you to fill, never guessed. Foreign-currency rows are valued from HMRC monthly rates. Then read off SA108-shaped figures with the annual exempt amount applied.

How HMRC taxes your Gemini activity

Selling for pounds, swapping one token for another, or spending crypto are all disposals. Each is matched under HMRC’s rules in order: same-day, then the 30-day bed and breakfast rule, then the per-token Section 104 pool. Staking and reward income is taxed at its GBP value on receipt. The full detail, with HMRC sources, is in the UK crypto tax guide.