Know your capital gains tax in seconds
Gainsy helps UK investors calculate CGT on stocks, shares, and options. No spreadsheets, no guesswork
- Built for UK tax rules
- Supports stocks, shares & options
- Supports option selling, assignment & exercise
Capital gains tax shouldn't be this confusing
- Figuring out CGT across multiple trades is a nightmare
- Spreadsheets break the moment things get complex
- Options and tax rules make it worse
- You don’t know what you owe until it’s too late
Gainsy fixes this.
From trades to tax in 3 steps
1
Import or add your trades
Manual entry or broker import
2
We apply UK CGT rules automatically
Bed & breakfasting, stock splits and more
3
See exactly what you owe
Clear breakdown, no jargon
Everything you need to stay on top of CGT
Accurate calculations
Always up to date with UK tax rules
Built for investors
Stocks, shares, and options handled properly
No spreadsheets
Clean, simple interface anyone can use
Tax confidence
Know your position before filing your return
Your capital gains, at a glance
Why investors choose Gainsy
Designed with input from active traders
Based on HMRC rules
| Gainsy | Spreadsheets |
|---|---|
| Automatic CGT rules | Manual formulas |
| Handles complex trades | Breaks easily |
| Clear outputs | Confusing |
| Built for UK tax | Generic |
| Automatic USD to GBP conversion | |
| Stock splits | |
| Handles option assignment |
Frequently Asked Questions
Yes, Gainsy is designed for UK tax rules and produces HMRC-compliant calculations.
Yes, Gainsy supports stocks, shares, and options (including assignment and exercise) for CGT calculations.
No, you can add trades manually or import them Via a CSV file.
Yes, Gainsy provides the breakdowns and reports you need for your self-assessment tax return.