UK Contractor Day Rate Calculator
Contractor Calculator's Day Rate Calculator works backwards from your target annual take-home pay to find the daily rate you need to charge. It uses HMRC 2025/26 tax rates and compares results across PAYE, Limited Company (inside and outside IR35), and Sole Trader structures.
252 working days minus holidays and sick days
Compare with a previous year
Select a change to see how it affected your results
Older changes are shown for reference but don't have historical rate data available for comparison.
How is this calculated?
The day rate calculator works backwards: given your target take-home pay, it finds the gross annual income that produces that net amount after all taxes. It then divides by your working days to give you the daily rate.
The calculation uses a binary search algorithm, testing different gross amounts through the full tax calculation until it finds the one that results in your target take-home pay. Tax calculations use the same HMRC 2025/26 rates as the Compare Structures calculator.
How have these tax rates changed?
Not sure about your IR35 status? Use our IR35 Status Estimator. Already know your day rate? Use our Compare Structures calculator to see what you'll actually take home.
Frequently Asked Questions
What daily rate should I charge as a UK contractor?
Your daily rate depends on your target take-home pay, employment structure, IR35 status, and working days per year. For example, to take home £40,000 per year working 220 days as a limited company contractor outside IR35, you would need to charge approximately £250-£280 per day. Inside IR35, you would need approximately £310-£340 per day for the same take-home.
How does IR35 affect my day rate?
Inside IR35, you need a significantly higher day rate to achieve the same take-home pay. This is because your income is taxed as deemed employment with employer NI deducted from your fees. Typically, you need 20-25% more gross income inside IR35 compared to outside IR35 for the same net pay.
How many working days are there in a year for contractors?
The UK has 252 working days per year (365 minus weekends). After subtracting 25 days holiday and 5-7 sick/admin days, most contractors use 220 days as a realistic working year.
Does my employment structure affect my day rate?
Yes, significantly. A limited company director outside IR35 typically needs the lowest day rate. Inside IR35 or via PAYE/umbrella requires a higher rate. The difference can be £50-£100+ per day depending on income levels.
Do Scottish contractors need a higher day rate?
Scottish residents pay higher Income Tax rates on earned income above approximately £28,850, which means Scottish contractors may need a slightly higher day rate to achieve the same take-home pay. Use the "Living in Scotland?" toggle above to see the difference.
These calculations are estimates based on current published tax rates. They do not constitute financial, tax, or legal advice. Always consult a qualified accountant for your specific situation.
Tax rates sourced from HMRC published rates for the 2025/26 tax year. Last verified: March 2026.