UK IR35 take-home calculator 2026/27
Compare an illustrative inside-IR35 payroll outcome with outside-IR35 company extraction.
How the IR35 comparison estimate works
The IR35 page compares two simplified cash outcomes from the same assignment value: an employment-style budget and an outside-IR35 company illustration. It is not a status assessment and cannot turn working practices into a legal conclusion.
Rules checked
Read the checking method
What the result includes
- Employer and employee NI in the inside illustration
- Corporation Tax and dividend tax in the outside illustration
- A stated annual cash difference between the two models
What to have ready
- Rate basis—assignment budget or taxable pay
- Realistic billable days and company costs
- The written contract and actual working practices for a separate status review
Questions about IR35 comparison
Does a larger outside-IR35 figure prove the role is outside?
No. Status depends on the contract and reality, including control, substitution and mutual obligations. The calculation only compares tax treatments.
Why does the inside result remove employer NI from the rate?
That route treats the entered amount as the assignment budget available to fund employment costs. Do not enter an advertised taxable salary on that basis.
About this estimate
This calculator cannot determine IR35 status. It is a simplified financial comparison, not an employment-status assessment.