Day Rate Calculator 2026/27

The rate tables behind step 1 come from two published sources: IT Jobs Watch, which tracks day rates from advertised UK contract vacancies, and the Langley James UK IT Salary Guide (January 2026 edition). Contractor community feedback sits behind the shape of the adjustments rather than the rates themselves. The set was gathered in March 2026 and is reproduced here unchanged.

A benchmark is then four multiplications on a published median, and nothing more:

1. The role median for your sector and specialism — 68 roles across 12 sectors.
2. × a location factor, relative to the UK national average: City of London and Canary Wharf 1.18, London (wider) 1.10, South East 1.02, remote or hybrid 1.03, down to Northern Ireland 0.82.
3. × an experience factor: junior (0–2 years) 0.65, mid-level (3–5 years) 0.85, senior (6–10 years) 1.00 — the level the published rates are quoted at — lead or principal 1.15, expert or specialist 1.28.
4. × an IR35 factor, which is 1.00 in every case: the tables show no gross-rate uplift for an inside-IR35 engagement. The difference between inside and outside shows up in take-home, not in the headline rate, which is what step 2 is for.

The lower and upper figures are the published spread for that role applied to the adjusted median — between ±9% and ±25% depending on how tightly the market prices the role. They are a range, not a promise: a benchmark tells you what the market has been paying, not what one client will pay you.

A day rate is a gross number a long way from your bank account. Two entirely different ladders sit between them, and which one you are on matters more than a few pounds on the rate.

Outside IR35, through your own company

1. Invoiced income = day rate × days billed, excluding VAT.
2. Less allowable company costs.
3. Less your salary, and less employer's NIC at 15% on the part of that salary above the £5,000 secondary threshold.
4. What is left is taxable profit. Corporation tax is 19% up to £50,000, 25% above £250,000, and marginal relief bridges the gap at an effective 26.5%.
5. Post-tax profit is paid out as dividends. Your personal tax is income tax on the salary, employee's NIC on the salary, and dividend tax at 10.75%, 35.75% and 39.35% on the dividends above a £500 nil-rate band.

Inside IR35, or through an umbrella

1. Assignment income = day rate × days billed. This is what the agency pays the umbrella, not what you get.
2. Less the umbrella margin, and less employer's NIC at 15% above £5,000 — both of which come out of the assignment rate before your gross pay exists. Because the NIC is charged on gross pay, gross pay has to be solved for, not subtracted to.
3. What remains is gross pay, which is taxed as employment income: income tax at 20/40/45% after your personal allowance, and employee's NIC at 8% between £12,570 and £50,270 and 2% above.
4. Holiday pay is carved out of gross pay, either rolled up at 12.07% or accrued and paid when you take leave. It is never an extra cost on top.

From 6 April 2026 an umbrella supply chain carries joint and several liability for PAYE that goes unpaid, but the umbrella still operates PAYE and the reform does not change any worker's take-home. The dividend rise, on the other hand, does: the ordinary and upper rates each went up two percentage points in April 2026, which closes part of the gap between the two ladders above.

Use the two halves of the tool against each other. Step 1 gives you the market's answer for your profile — a median with a quartile either side of it. Step 2 gives you your own floor: switch it to Target take-home → rate, enter the net income you need for the year and the days you can realistically bill, and it returns the lowest whole-pound day rate that clears it. If your floor lands above the upper quartile, the problem is the days, the costs or the target, not your negotiating.

Three things people leave out of that floor:

• Unbilled time. 220 days is a working year with eight weeks out. If you have a month between contracts, it is 200 days, and the rate has to carry it.
• Costs an employee never sees. Accountancy, insurance, equipment, training, travel and your own pension all come out of the same invoice.
• The tax wedge. Every pound of rate is not a pound of income: at most contractor profit levels the marginal pound is being cut by corporation tax and then dividend tax on the way out.

Then test the benchmark against evidence of your own: rates in current adverts for the same role and location, what agencies are actually quoting you this month, and what your last contract paid. A published median is a strong opening position precisely because you can say where it came from — but a client can produce a different survey, so know your own floor as well. Our contractor rates guide covers the negotiation itself, and there are twenty more calculators for the rest of the arithmetic.