UKCGT – UK Capital Gains Tax calculator

Version 3.6 · 15 May 2026 (SteveSi)
UKCGT is a UK share capital gain calculator which includes the HMRC same-day, 30-day bed-and-breakfast and Section 104 share matching rules (but not ERI). It accepts and combines multiple downloaded broker files – for instance, you can select three T212 csv fles + two ii csv files + a Barclays csv file. CSVs should cover all years from all brokers.
Supports .csv files for: Trading 212, Barclays (.xls must be converted to .csv first), Interactive Investor, LightYear/Sharesight, AJ Bell and cgtcalculator.com text files.
If your broker is not supported (UK only), please send me a sample of your csv and I will add in support within a few days.

These results should be similar to those from cgtcalculator.com with ‘Apply rounding’ unchecked.

Notes: no ERI, tax rate, annual exemption, loss carry-forward, spouse transfer, option, reorganisation, or pre-6-Apr-2008 special handling is included.

This page does not submit data anywhere. It has no external scripts, analytics, storage, or network calls.

Tax year summary

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Disposals

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Final Section 104 pools

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