Built in London

CGT Calculator helps UK investors and traders calculate their Capital Gains Tax. Upload your broker statements and we apply HMRC rules — Section 104 pooling, the 30-day matching rule, same-day matching — to produce a complete tax report for your Self Assessment.

We support Trading 212, Freetrade, Charles Schwab, Morgan Stanley, Interactive Brokers, Binance, Coinbase, and more. Stocks, ETFs, options, and crypto — all in one place.

Your data stays private. We process everything in your browser. Your transaction files are never uploaded to our servers, never stored, never shared.

HMRC compliance. We follow current HMRC guidance for share matching rules, foreign exchange conversion, and capital gains reporting. When the rules change, the calculator updates.

For questions, support, or feedback — email us directly.