Umbrella Company Calculator

Our umbrella company calculator works out your take-home pay from any assignment rate using 2026/27 UK rates. Enter your rate, hours and the umbrella’s weekly margin — it deducts employer National Insurance, the margin, income tax and employee NI, showing every step.

An umbrella assignment rate always looks generous. £500 a day sounds a lot better than it is — because that rate has to carry costs a normal employer would never show you: employer’s National Insurance, the umbrella’s own margin, and then your tax and NI on top of what’s left. This calculator strips all of that back, step by step, so you can see exactly what lands in your bank account.

It’s independent. We’re not an umbrella company, so there’s nothing to sign and no sales call afterwards. Enter your assignment rate, your hours and the umbrella’s weekly margin, and you’ll get the maths using 2026/27 rates — with every deduction shown.

How the umbrella company calculator works

Almost all the confusion about umbrella pay comes from one fact: your assignment rate is not your salary. The agency pays the umbrella company your assignment rate. Out of that pot, the umbrella has to cover three things before you see a penny:

1. Its own margin — the fee for running your payroll, invoicing the agency and handling your tax.
2. Employer’s National Insurance — 15% on your gross pay above £5,000 a year. This is the big one, and the reason the assignment rate looks so much higher than the pay.
3. Your gross pay — whatever is left. Income tax and employee National Insurance are then calculated on this figure through PAYE, exactly as for any other employee.

The formula this calculator follows:

• Employer’s NI = 15% × (gross pay − £5,000)
• Gross pay = (assignment rate − umbrella margin + £750) ÷ 1.15
• Take-home = gross pay − income tax − employee NI

The £750 in the middle line is just 15% of the £5,000 employer NI threshold, moved to the other side of the equation — you don’t need to memorise it, the calculator does the work. But it’s worth seeing once, because it shows the uncomfortable truth plainly: the assignment rate has to cover employer NI, so it comes off before your gross pay is even calculated.

You can also see the National Insurance half of your payslip, worked out on its own.

Why the assignment rate looks higher than a PAYE salary

It isn’t really higher — it’s just more honest about where the money goes. If you were paid through an agency’s own PAYE payroll, the agency would quietly absorb the employer costs and quote you a lower headline rate. An umbrella company can’t absorb those costs; it has to pass them through visibly inside your assignment rate.

So a £48,750 umbrella assignment rate and a £42,000 PAYE salary can put very similar money in your pocket — the worked example below lands at £41,913 of gross pay from that £48,750 rate. Comparing the two headline numbers directly, without adjusting for employer costs, is the single most common mistake contractors make when weighing up an umbrella offer against a permanent or PAYE role.

What the umbrella margin actually buys you

Twenty-five pounds a week for running payroll sounds steep until you list what it covers: invoicing the agency, running PAYE, handling your tax code with HMRC, employer’s liability insurance, and giving you continuous employment — which matters for mortgage applications and for statutory employment rights that build up with service. Whether that’s worth it depends on the alternative. If the agency offers its own PAYE payroll, the margin buys you nothing extra and agency PAYE is usually the better deal. If the choice is umbrella versus your own limited company for an inside-IR35 contract, the umbrella wins on admin alone: no accounts, no company tax returns, no deemed payment calculations at year end.

What the margin doesn’t buy you is tax advice, financial advice, or anyone acting in your interests when something goes wrong. The umbrella is a payroll provider, not your accountant. Read the contract before signing — particularly the clauses on holiday pay, notice periods, and what happens to your pay if the agency pays the umbrella late.

If you’re unsure about the contract itself, start by working out whether the contract should be inside IR35 at all.

2026/27 rates used by this calculator

Band	Taxable income	Income tax	Employee NI
Personal allowance	Up to £12,570	0%	0%
Basic rate	£12,571 – £50,270	20%	8%
Higher rate	£50,271 – £125,140	40%	2%
Additional rate	Over £125,140	45%	2%

Employer’s National Insurance is charged at 15% on gross pay above £5,000 a year. Scottish taxpayers pay Scottish income tax rates instead of the ones above — the examples below use England, Wales and Northern Ireland rates.

Worked example 1: £25 an hour

Take an assignment rate of £25 an hour, working 37.5 hours a week for 52 weeks. That’s £48,750 a year (25 × 37.5 × 52). The umbrella charges a £25 weekly margin — £1,300 a year. Here’s the full chain:

1. Assignment rate after margin: £48,750 − £1,300 = £47,450
2. Gross pay: (£47,450 + £750) ÷ 1.15 = £48,200 ÷ 1.15 = £41,913.04
3. Reconciliation check — employer’s NI: 15% × (£41,913.04 − £5,000) = 0.15 × £36,913.04 = £5,536.96. And £41,913.04 + £5,536.96 + £1,300 = £48,750. It all reconciles.
4. Income tax: 20% × (£41,913.04 − £12,570) = 20% × £29,343.04 = £5,868.61
5. Employee NI: 8% × £29,343.04 = £2,347.44
6. Take-home: £41,913.04 − £5,868.61 − £2,347.44 = £33,696.99

So a £48,750 assignment rate becomes £33,697 in your pocket. That gap surprises people every time — but now you can point to exactly where each pound went: £1,300 to the umbrella, £5,537 to employer NI, £5,869 to income tax and £2,347 to employee NI.

Worked example 2: £400 a day

A £400 day rate, 5 days a week, 46 weeks a year gives an assignment rate of £92,000 (400 × 5 × 46). Same £25 weekly margin (£1,300 a year):

1. Assignment rate after margin: £92,000 − £1,300 = £90,700
2. Gross pay: (£90,700 + £750) ÷ 1.15 = £91,450 ÷ 1.15 = £79,521.74
3. Employer’s NI check: 0.15 × (£79,521.74 − £5,000) = 0.15 × £74,521.74 = £11,178.26
4. Income tax: basic rate 20% × £37,700 = £7,540; higher rate 40% × (£79,521.74 − £50,270 = £29,251.74) = £11,700.70; total £19,240.70
5. Employee NI: 8% × £37,700 = £3,016; 2% × £29,251.74 = £585.03; total £3,601.03
6. Take-home: £79,521.74 − £19,240.70 − £3,601.03 = £56,680.01

At this level the higher rate band does most of the damage — nearly £11,700 of the £19,241 income tax bill is 40% tax. The employer NI step alone takes £11,178 off the assignment rate before your own tax starts.

What your umbrella company calculator result means — what to check before you sign

The calculator gives you the number. These are the things that decide whether that number is the one you’ll actually see:

• Get the margin in writing. “Between £20 and £30 a week” isn’t a quote. Ask for the exact weekly figure, and run it through the calculator above — a £5 difference is £260 a year.
• Check your tax code on the first payslip. Umbrellas sometimes put new starters on emergency tax if your P45 hasn’t arrived. It usually corrects itself once HMRC issues the right code, and overpaid tax comes back through payroll — but check.
• Ask how holiday pay works. You’re legally an employee of the umbrella, so you accrue statutory holiday. Some umbrellas roll holiday pay into your rate; others hold it back and pay it when you take leave. Both are legal, but they make your payslips look very different.
• Compare illustrations sceptically. An umbrella’s own take-home illustration is a sales document. Run the same assignment rate and the same margin through this umbrella company calculator — if the numbers don’t match within a few pounds, ask why.
• Plan for gaps. No work means no pay. Between assignments there’s no salary continuing in the background, so the annual figure only holds if you actually work the weeks you entered.
• If illness stops you working, see what you’d get if you’re off sick as an umbrella employee.

Common mistakes

• Comparing the assignment rate to a permanent salary. The £48,750 rate in the first example becomes £41,913 of gross pay — compare that figure to the salary, never the headline rate.
• Forgetting the margin is weekly. £25 a week sounds trivial; £1,300 a year is not.
• Trusting the umbrella’s illustration without checking. Same rate, same margin, independent calculator — that’s the only like-for-like comparison.
• Ignoring your tax code. A wrong code moves your take-home far more than a slightly cheaper margin ever will.
• Assuming expenses will fix it. Most umbrella workers can’t claim travel and subsistence the way limited company contractors once could, so don’t let anyone sell you the role on promised expense savings.

What this umbrella company calculator doesn’t cover

• Pension contributions and salary sacrifice arrangements, which some umbrellas offer.
• Student loan repayments, deducted after tax.
• The Apprenticeship Levy, where an umbrella passes it through — this is provider-dependent.
• Holiday pay treatment — rolled-up versus accrued changes the look of your payslips.
• Expenses. Travel and subsistence claims are heavily restricted for umbrella workers.
• Scottish income tax rates. The examples use England, Wales and Northern Ireland rates.