How Your Contractor Take-Home Pay Is Calculated (2025/26)

Last updated June 2026

When you see a take-home figure on a calculator, it helps to understand what’s behind it. This guide walks through exactly how your contractor take-home pay is calculated for the 2025/26 tax year, for both the umbrella (inside IR35) and limited company (outside IR35) routes. Our calculator does all of this instantly, but understanding the mechanics helps you make better decisions.

The 2025/26 numbers you need

Personal allowance: £12,570 (reduced by £1 for every £2 of income over £100,000, gone at £125,140).
Income tax (rest of UK): 20% basic up to £37,700 above the allowance, 40% higher to £125,140, 45% additional above.
Employee National Insurance: 8% between £12,570 and £50,270, then 2% above.
Employer National Insurance: 15% above the £5,000 secondary threshold.
Dividend tax: £500 allowance, then 8.75% / 33.75% / 39.35% by band.
Corporation tax: 19% on profits up to £50,000, 25% above £250,000, with marginal relief between.

Scotland has different income tax bands; the figures above are for the rest of the UK.

Umbrella (inside IR35), step by step

Start with the assignment rate — your day rate multiplied by days worked. Say £500 × 220 = £110,000.
Deduct the umbrella margin — its weekly fee, e.g. £25 × 46 weeks = £1,150.
Deduct employer’s costs — employer’s National Insurance and the 0.5% apprenticeship levy come out of the assignment rate, because legally the umbrella is your employer and these are employer taxes. This is the part that surprises new contractors: the “employer” costs are effectively funded from your rate.
You now have a gross salary. Run PAYE on it: income tax plus employee’s National Insurance.
What’s left is your take-home.

This is why an umbrella take-home on a high day rate can feel low — three separate deductions (margin, employer NI + levy, then your own tax and NI) all come out before you see the money.

Limited company (outside IR35), step by step

Company revenue — day rate times days, e.g. £110,000.
Pay a director’s salary — commonly £12,570, which uses your personal allowance and is a company expense. (There’s a small amount of employer’s NI on it above the £5,000 threshold.)
Deduct allowable expenses — accountancy, equipment, pension contributions and so on.
Calculate corporation tax on the remaining profit.
Distribute the post-tax profit as dividends.
Apply personal tax: the £12,570 salary is within the personal allowance so attracts no income tax, and the dividends are taxed at 8.75% / 33.75% / 39.35% after the £500 allowance.
Add it up: salary (after any tax/NI) plus dividends minus dividend tax equals take-home.

Why outside IR35 usually wins

The advantage comes from two things. First, dividends carry no National Insurance — neither employee’s nor employer’s — whereas every pound of umbrella salary does. Second, dividend tax rates are lower than income tax rates at each band. Even after the company pays corporation tax, the combined effect typically beats the employee-style taxation of an umbrella.

The size of the gap depends on your rate. At lower day rates the difference is modest; at higher rates, where more income would fall into higher tax bands as salary, the dividend advantage grows.

What these calculations leave out

A clean comparison deliberately ignores some real-world details that affect individuals differently:

Student loan repayments, which apply to employment income and dividends differently.
Pension contributions, which can dramatically change the most efficient strategy.
Benefits in kind, such as a company car.
Scottish income tax bands.
VAT and the flat rate scheme, which affect cash flow but not usually your personal take-home.

That’s why every good calculator, including ours, describes its output as an estimate for comparison. Use it to understand the shape of the decision, then confirm the precise numbers with an accountant who knows your full situation.

Information for the 2025/26 tax year (rest of UK). This is an explanation, not tax advice.