Built to save you money
IR35 calculator for contractors
If you contract through an agency or your own company, IR35 decides how your money is taxed. Put your real day rate in and see all three routes side by side, using published UK 2025/26 rates.
Status is not a choice. It depends on how you actually work, and for medium and large clients the client decides and must give you a written determination. This tool shows what each honest outcome costs, so you can plan and negotiate. It never suggests calling a contract outside IR35 when it is not.
Your figures
Everything starts at nothing. Each number below is one you type, and the example is clearly your choice.
Nothing entered yet, so nothing is owed
Add your day rate and the days you expect to bill, and the three routes will appear here. We will never fill in an income for you.