Salary To Contract Rate Calculator UK
This calculator works backwards from a permanent salary and asks the practical contractor question: what day rate would I need for the contract role to be genuinely equivalent once paid holiday, pension, employer costs and non-billable time disappear?
That makes it useful for people moving from permanent to contract work, agencies shaping rate cards and candidates trying to avoid underpricing themselves when the recruiter only quotes a day rate.
Convert salary to a contract day rate
Enter the permanent package assumptions and the contractor work pattern you expect. The result appears only after you click calculate.
Equivalent contractor rate
How this calculator works
The tool starts with the real employer-side cost of a permanent role rather than the base salary alone. That means salary, bonus, employer pension and employer National Insurance are all pulled into the package before a contractor buffer is applied.
It then spreads that target revenue across the billable weeks and days you expect to sell. This is the step many quick online calculators skip.
Worked example
Suppose your permanent package is £55,000 salary, £3,000 bonus, £2,500 benefits and a 5% employer pension. Once employer NI and the apprenticeship levy are considered, the real package cost is materially higher than £55,000.
If you only expect 46 billable weeks, the contract day rate must be high enough to cover holiday gaps, bench time and business risk.
2025/26 rates, thresholds, and inputs
A modest 5% to 15% margin is common for cautious rate setting, but the correct buffer depends on market stability and overhead.
| Input | Why it matters |
|---|---|
| Base salary | Your guaranteed permanent pay |
| Bonus and benefits | Part of the total package you are replacing |
| Employer pension | Permanent roles often include this cost |
| Billable weeks | Allows for holiday, gaps and non-billable time |
| Target buffer | Builds in contractor risk and admin overhead |
Edge cases and assumptions
- This tool is aimed at first-pass rate planning, not a full IR35 decision.
- It assumes the role is full-time-equivalent work.
- Contractor expenses, VAT treatment and insurance costs are not separately modelled.
- If the role is inside IR35, your target day rate often needs to be higher again to protect take-home pay.
FAQs
Why is the contract rate much higher than my annual salary divided by 260?
Because a contractor has unpaid holiday, non-billable days, admin time and commercial risk. A straight salary-to-day-rate division usually underprices the role.
Should I include bonus and benefits when converting salary to contract rate?
Yes. If you are comparing a permanent package against a contract role, using only base salary creates a weak comparison.
Does this calculator decide IR35 status?
No. It helps you estimate a realistic rate; IR35 status is a separate legal and tax question.
Sources and methodology
This methodology uses standard UK employer-cost assumptions for 2025/26 and focuses on package replacement rather than headline salary only.
The day-rate output is a planning number. Real contractor pricing should also consider market demand, payment terms and IR35 treatment.