Contractor Day Rate Calculator UK — From Salary or Target Income (2026/27)
Work backwards from a target net salary to your required day rate, or enter a day rate to see your net income across all three IR35 scenarios. Adjust holidays, bank holidays, and sick days to match your real schedule.
| Item | Amount |
|---|---|
| Working days per year | — |
| Gross annual contract value | £0 |
| Total deductions | £0 |
| Net take-home | £0 |
How It Works
Two calculation modes for every contractor situation.
Enter your day rate (£500 default), choose your IR35 status, and adjust your working calendar — holidays, bank holidays, sick/bench days — to see your net take-home across all three IR35 scenarios. The comparison cards show outside IR35 (limited company), inside IR35 (deemed employee), and umbrella company side by side so you can compare take-home at a glance.
Work backwards from a target annual net income — for example £80,000 — to find the exact day rate you need to quote. The calculator runs a binary-search algorithm across outside IR35, inside IR35, and umbrella scenarios, then shows each rate and what the resulting gross contract value looks like. Adjust pension and student loan to refine the result.
Worked Example
A developer earning £80,000 in a permanent role wants to know what day rate to quote for an outside IR35 contract.
| Metric | Value |
|---|---|
| Target net income (perm salary) | £80,000 |
| Working days per year | 222 (260 − 25 − 8 − 5) |
| Required day rate (outside IR35) | £590 |
| Gross annual contract value | £130,980 |
| Inside IR35 equivalent rate | £770/day (+31%) |
| Umbrella equivalent rate | £710/day (+20%) |
| Net take-home | £80,000 |
At a £590/day outside IR35 rate, this contractor achieves their full £80,000 target. The same contract inside IR35 would require approximately £770/day to match that net — a £180/day gap that highlights the tax advantage of outside IR35 status. Adding 10% pension (£13,098) would reduce corporation and dividend tax further, increasing net take-home or allowing a lower rate.
Assumptions and Limitations
This calculator provides illustrative estimates based on published HMRC rates. Every contracting situation is unique — adjust the inputs to match your circumstances.
Tax rates applied
- Personal allowance: £12,570 (2026/27) — Basic 20%: £12,571–£50,270
- Higher 40%: £50,271–£125,140 | Additional 45%: over £125,140
- Scottish bands: Starter 19%, Basic 20%, Intermediate 21%, Higher 42%, Top 48%
- Employer NI 15% above £5,000/yr | Employee NI 8%/2%
- Corporation tax 19% (profits under £50k) → 25% marginal
- Dividend tax 8.75%/33.75%/39.35% above £500 allowance
Key limitations
- No other employment income or benefits in kind
- Standard personal allowance (no high-income taper)
- Outside IR35: all post-tax profit drawn as dividends
- Inside IR35: PAYE on full contract value after pension sacrifice
- No VAT, R&D credits, capital allowances, or CIS scheme
- No marriage allowance or spouse salary splitting
Working days & student loan
- Default 222 working days (260 − 25 − 8 − 5), fully configurable
- Consistent day rate assumed across all working days
- Bench time between contracts not included
- Plan 1: 9% above £24,375/yr | Plan 2: 9% above £27,295/yr
- Plan 4: 9% above £31,395/yr | Plan 5: 9% above £25,000/yr
- Outside IR35: student loan may not apply (dividends ≠ employment income)
Contractor Day Rate Calculator FAQ
Switch the calculator to "Income → Rate" mode, enter your target net income, select your IR35 status (outside IR35 is most common for contractors), and adjust the working days to match your expected schedule. The calculator will show the exact day rate you need to quote. A rough perm-to-contract rule: divide your permanent salary by 220 working days, then multiply by 1.3–1.5 for benefits and risk.
A full-time UK contractor typically works 220–230 days per year. This is 260 weekdays (52 × 5) minus 25 holiday days, 8 UK bank holidays, and 5–10 sick/bench days. The calculator uses 222 working days as the default (260 − 25 − 8 − 5). Adjust these numbers in the input panel to reflect your personal schedule. Some contractors work fewer days (200–210) to account for extended bench time between contracts.
UK day rates vary significantly by sector and seniority. As of 2026: Junior/Junior-Mid developers £300–£450, Senior developers £500–£700, Lead/Architect £650–£950, DevOps engineers £500–£850, Project/Delivery Managers £400–£700, Business Analysts £350–£600, Data Engineers/Scientists £500–£850. Outside IR35 rates are typically 10–15% higher than inside IR35 rates for the same role due to the tax efficiency difference.
If your contract is inside IR35, you should negotiate a higher day rate to compensate for the additional tax burden. Use the IR35 rate uplift calculator to find the exact uplift needed. As a rough guide, inside IR35 rates should be 20–35% higher than outside IR35 rates for the same net take-home. For example, if an outside IR35 role pays £550/day, you'd need approximately £680–£740/day inside IR35 to match your take-home.
Yes. Pension contributions are one of the most powerful levers for reducing your tax bill as a contractor. At a £700/day outside IR35 rate, contributing 10% to your pension saves approximately £3,300 in corporation tax and £4,100 in dividend tax compared to no pension. This makes pension-funded day rate reductions a viable negotiation strategy — you can accept a slightly lower rate if the client offers a pension contribution instead.
Student loan repayments are calculated at 9% of income above your plan's threshold. For inside IR35 and umbrella scenarios, repayments are deducted from your employment income via PAYE, which reduces your net take-home. Outside IR35, student loans don't apply because dividends are not classed as employment income. This can be a significant advantage — a Plan 2 contractor earning £150,000 gross inside IR35 pays approximately £11,000/year in student loan repayments, while the same contractor outside IR35 pays zero.