Short answer: CGTCalculator.com is a strong free choice for manually prepared transactions, cryptoassets and older years. FiscalFox is the stronger workflow for supported broker exports, multi-broker share matching, combining shares with crypto gains from Awaken or Koinly, review warnings and report evidence. The right choice depends on the data and the audit trail you need.
Feature comparison
| Area | FiscalFox | CGTCalculator.com |
|---|---|---|
| Input | Native CSV or Excel imports for 21 named brokers; a background check for an unrecognised layout, checked against every row. | Copy-and-paste transaction text and example formats; useful when the investor prepares the input. |
| Multiple brokers | Combines supported imports before matching the same security. | Possible through a combined manually prepared input. |
| Share matching | Same-day, following 30 days and Section 104 pooling, with disposal-level evidence and review warnings. | Calculates UK identification rules and provides a calculation result. |
| Asset focus | Shares, funds, ETFs and supported option rows, plus crypto gains imported from an Awaken or Koinly report. | Shares and cryptocurrency are advertised. |
| Brought-forward losses | Enter losses from earlier years for the selected tax year; they are applied after current-year losses, only down to the annual exempt amount. | Provides a carried-forward loss input. |
| Corporate actions | Detects or flags potential stock splits and other complex rows for review; it does not promise automatic treatment of every reorganisation. | Users can prepare adjusted transaction input; check the site guidance for the relevant event. |
| Outputs | Calculation preview plus paid PDF/CSV report packs and SA108 support fields for published filing years. | Free on-page calculation output. |
| Price | Free calculation; £39.99 for a report pack covering one tax year. | Free to use. |
When FiscalFox is the better fit
FiscalFox is built for the messy step before the tax calculation: interpreting broker exports, preserving source references, combining accounts, surfacing incomplete history and producing a reviewable disposal schedule. That is most valuable when there are many transactions or several brokers.
Try the UK capital gains tax calculator, read the calculation methodology, or inspect the synthetic report example before deciding.
When CGTCalculator.com is the better fit
If you want a free calculation, already have clean transaction text, need crypto worked out from raw exchange trades without a separate crypto-tax report, or need a historical year outside FiscalFox’s range, CGTCalculator.com may be the more suitable tool.
A precise note on data handling
FiscalFox parses supported broker files in the browser. Signed-in users can choose to save calculation data, and a file our usual import cannot read goes to a background check that uses AI on its column headings and a few sample rows, without a separate permission step. Read the FiscalFox privacy policy for the complete terms. CGTCalculator.com states that uploaded data is not saved; read its privacy statement directly. Neither summary should replace the policy that applies when you use the service.
How this comparison was prepared
This page was checked against the public product interfaces and policies on 12 October 2026. It avoids ratings, invented customer counts and claims that cannot be reproduced. Product capabilities change, so verify a critical feature on the linked service before relying on it.
Frequently asked questions
Which calculator is better for multiple broker accounts?
FiscalFox is designed to import supported files from multiple brokers into one calculation. CGTCalculator.com can accept manually prepared transaction text, which may suit investors willing to normalise their own data.
Which tool supports cryptoassets?
CGTCalculator.com advertises cryptocurrency calculations. FiscalFox calculates shares, funds, ETFs and supported option transactions. It does not calculate crypto from exchange trades itself, but it imports an Awaken UK capital gains CSV or a Koinly Capital Gains Report and adds those crypto gains to your share gains in one report.
Is either result a substitute for tax advice?
No. Both are calculation tools. Investors remain responsible for checking source data, unusual transactions and the figures submitted to HMRC.
Official UK tax references
This guide is checked against published GOV.UK and HMRC material. FiscalFox is a calculation tool, not personal tax advice; review unusual transactions with a qualified adviser.