Free Tools for UK Tradespeople
Instant calculators for UK sole traders and CIS contractors. No signup, no data stored — results appear as you type.
CIS Tax Calculator
Calculate your CIS deduction instantly — enter gross amount, select 0%, 20% or 30% rate, and see the net payable in seconds.
Late PaymentLate Payment Interest Calculator
Calculate statutory interest on overdue invoices under the Late Payment Act 1998. Current rate: Bank of England base rate + 8%.
Why Use These Tools?
UK sole traders and CIS subcontractors deal with complex deduction calculations on every invoice. These free tools give you instant, accurate figures so you always know exactly what you're owed — and what you can claim when clients pay late.
All calculations happen directly in your browser. No data is sent to any server, no account required.
More Than Just Calculators
FlashBill does these calculations automatically on every invoice you send. Try it free →