Calculator Methodology
Complete transparency: every formula, every rate, every source — so you can verify our calculations yourself.
Current Tax Year: 2026/27
All rates on this page are for the 2026/27 UK tax year. Last reviewed: April 2026. Rate changes are published by HMRC at gov.uk .
Overview: The Umbrella Pay Flow
Working through an umbrella company introduces a unique pay structure. Unlike a direct PAYE job where deductions are straightforward, umbrella pay involves deductions before your gross salary is calculated — specifically employer's National Insurance and the apprenticeship levy.
This means the money you negotiate with a client or agency (your "day rate" or "assignment rate") is not the same as your gross salary. Our calculator models this entire chain, from assignment rate to net take-home.
Step-by-Step Calculation
Assignment Rate (Annual)
Formula
Day Rate × Days Per Week × Weeks Per YearExample (£500/day)
£500 × 5 × 48 = £120,000The assignment rate is the total amount the recruitment agency pays the umbrella company. It is the starting point for all deductions.
Employer's National Insurance
Formula
(Assignment Rate − £5,000) × 15%Example (£500/day)
(£120,000 − £5,000) × 15% = £17,250Employer NI is deducted from the assignment rate before the worker sees any money. The umbrella company is legally required to pay this as the employer.
Apprenticeship Levy
Formula
Assignment Rate × 0.5%Example (£500/day)
£120,000 × 0.5% = £600Also deducted from the assignment rate. The levy applies because umbrella companies typically have pay bills well above the £3m exemption threshold.
Umbrella Company Margin
Formula
Margin (Weekly) × Weeks Per YearExample (£500/day)
£25 × 48 = £1,200The umbrella company's fee for their payroll and compliance services. Deducted from the assignment rate to arrive at gross pay.
Gross Salary
Formula
Assignment Rate − Employer NI − Apprenticeship Levy − Umbrella MarginExample (£500/day)
£120,000 − £17,250 − £600 − £1,200 = £100,950This is the gross salary from which PAYE income tax and employee NI are calculated.
Employee Pension Contribution
Formula
Gross Salary × Pension % (if applicable)Example (£500/day)
£100,950 × 3% = £3,029 (reduces taxable income)Employee pension contributions into a relief-at-source pension reduce taxable income.
Income Tax (PAYE)
Formula
20% on (Gross − Personal Allowance) up to £50,270, then 40%Example (£500/day)
20% × (£50,270 − £12,570) + 40% × (£97,921 − £50,270) = £26,432Calculated on gross salary minus pension contributions and personal allowance. Scottish taxpayers pay different rates.
Employee National Insurance
Formula
8% between £12,570–£50,270, then 2%Example (£500/day)
8% × (£50,270 − £12,570) + 2% × (£97,921 − £50,270) = £3,969Class 1 employee NI calculated on gross salary minus pension contributions.
Net Take-Home Pay
Formula
Gross Salary − Pension − Income Tax − Employee NI − Student Loan (if any)Example (£500/day)
£100,950 − £3,029 − £26,432 − £3,969 = £67,520Your actual annual take-home pay after all deductions.
2026/27 Tax Rates & Thresholds Used
| Rate / Threshold | Value | Source |
|---|---|---|
| Income Tax – Personal Allowance | £12,570 | HMRC |
| Income Tax – Basic Rate | 20% (up to £50,270) | HMRC |
| Income Tax – Higher Rate | 40% (£50,270–£125,140) | HMRC |
| Income Tax – Additional Rate | 45% (above £125,140) | HMRC |
| Employee NI – Primary Threshold | £12,570/year | HMRC |
| Employee NI – Main Rate | 8% (to £50,270) | HMRC |
| Employee NI – Upper Rate | 2% (above £50,270) | HMRC |
| Employer NI – Secondary Threshold | £5,000/year | HMRC |
| Employer NI Rate | 15% | HMRC (from Apr 2025) |
| Apprenticeship Levy | 0.5% | HMRC |
* Scottish taxpayers pay different income tax rates. This calculator uses England, Wales & Northern Ireland rates.
Limitations & Assumptions
Our calculator makes the following assumptions which may not apply to all situations:
- England, Wales & Northern Ireland rates only — Scottish taxpayers pay different income tax rates
- No benefits in kind — additional taxable benefits are not modelled
- Single income source — assumes umbrella income is the only employment income
- Standard personal allowance — the allowance is reduced for income above £100,000 (tapered removal)
- Auto-enrolment minimum employer pension — not included in the umbrella margin; ask your umbrella company
- Holiday pay — not included; umbrella companies handle holiday pay differently (rolled-up or separate)
- Assignment rate = Day rate × Days — we assume the day rate entered is the assignment rate (what the agency pays the umbrella). Some agencies quote rates differently.
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