IT contractor on £88,000

Inside-IR35 Umbrella. Inside IR35. Age 32. Pension preference: modest.

Every figure on this page is computed at build time by the same engines that power the live salary–dividend split, take-home and SIPP optimiser calculators. Inputs come from a single CSV row; outputs come from the engines. No static lookup tables, no hand-coded numbers.

Net cash

£51,468

Pension

£4,400

Effective rate

36.5%

Marginal rate

42%

How much tax does a it contractor on £88,000 actually pay in 2026/27?

Short answer: £32,132 per year — an effective rate of 36.5% on gross contract value.

What's in that number? For an inside-IR35 contractor the figure is the sum of the umbrella fee (£1,500), employer NI (£11,565), employee NI (£3,421) and PAYE income tax (£15,646). The Apprenticeship Levy is not modelled (defaults off — see the methodology note on the take-home calculator).

What's the marginal rate on the next £1? 42%. This is the number that matters for "is one more invoice worth the cost in lost benefits / extra effort?" decisions — it is always higher than the average effective rate.

How does this compare to PAYE employment at the same gross? The PAYE figure for a £88,000 salaried employee in 2026/27 is roughly £29,040 of combined income tax + employee NI. The structure-specific savings come from where the deductions sit, not whether they sit anywhere — see the contractor tax guide for the side-by-side maths.

The numbers, line by line

Day rate	£400
Contract value (220 days)	£88,000
Inside-IR35 net cash	£51,468
Inside-IR35 pension	£4,400
Outside-IR35 net cash	£57,048
Outside-IR35 pension	£4,000
Cost of being inside IR35 (net wealth)	£5,180
Break-even outside-IR35 day rate	£454

Why this scenario is different

Compared to the closest peer profile — Software contractor at £88,000 — this scenario sits £0 higher on gross income. That moves net cash by +£0, the pension contribution by +£0, and the effective rate by +0%. The effective rate moves only modestly — both scenarios sit inside the same binding tax band. The break-even outside-IR35 day rate moves from £454 to £454 per day.

Questions this scenario raises

Is the Apprenticeship Levy actually due on my umbrella rate?

Legally, only if the umbrella's total annual paybill exceeds £3 million — and even then it falls on the umbrella, not the contractor. In practice many umbrellas pass it through as a 0.5% deduction. This page models the levy as off by default; toggle it on in the take-home calculator to see the effect.

Why is the effective rate lower than the headline tax brackets?

Because the headline 20% / 40% / 45% rates apply only to the income slice in each band — not the whole income. The Personal Allowance shelters the first £12,570 at 0%; the basic-rate band only charges 20% on the next £37,700; and so on. The effective rate on the entire income is the weighted average of every slice — typically much lower than the headline number people quote.

Are the engine assumptions documented anywhere?

Yes — every constant lives in src/lib/tax/constants.ts with a source-URL comment. Every engine function is unit-tested against HMRC examples (180+ test cases). The full methodology is at /about and the per-engine assumptions are spelled out at the foot of each calculator.

Is this calculation valid for the 2027/28 tax year?

Only partially. Thresholds (PA, basic-rate, higher-rate, NI thresholds) are frozen through April 2028 per the Autumn Budget 2024. Some rates may change at the Spring 2027 Budget. The figures here are accurate for 2026/27 and will be re-run after any future Finance Act changes — check the published-date footer of this page.

Does it include Scottish income tax?

No. Scotland has its own income-tax band schedule (Starter 19% / Basic 20% / Intermediate 21% / Higher 42% / Advanced 45% / Top 48% for 2026/27). National Insurance and corporation tax are still set at UK-wide rates. A Scotland-specific batch of programmatic pages is planned but is not in this batch.

Methodology

Income tax, National Insurance and Corporation Tax bands taken from HMRC's 2026/27 rates and allowances tables (gov.uk/.../income-tax; corporation-tax). Pension Annual Allowance and taper rules from Finance Act 2004 / 2023. Trading allowance per ITTOIA 2005 s.783A. Voluntary Class 2 figure (£179.40/yr = £3.45/wk × 52) from HMRC voluntary NI guidance.

Style: 2026/27 tax year throughout; figures rounded to whole pounds in the user-facing prose; effective rates computed as (deductions / gross). The voice is methodological — no first person, no claimed credentials, no marketing fluff.

This page is not personalised advice; for advice regulated by the FCA, consult an adviser registered with the Financial Conduct Authority. See the full disclaimer.