Support Us
This calculator is completely free, and its calculation engine is open source. It is built and maintained by an individual developer who believes tax tools should be accessible to everyone.
Sponsor on GitHub
Your donations help me keep the calculation engine open source, pay for hosting the website, and keep it free for everyone — without ads.
Sponsor on GitHubShare with Friends
Know someone who trades UK shares? Share this calculator with them. Word of mouth is the best marketing.
Open Source
The calculation engine is fully open source. You can inspect exactly how your gains are calculated, verify the matching rules, and audit the code yourself.
Thank you for using the calculator and for any support you can offer. Every star, share, and contribution makes a difference.