Software 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 HMRC defines the band this income falls into

A software contractor at £88,000 of gross for 2026/27 — plus any other personal income that stacks below — falls into the higher-rate band. HMRC's published rules for this band are unchanged from the figures announced in the Autumn Budget 2024 (which froze all the major thresholds at their April 2021 levels until at least April 2028).

For reference, the 2026/27 boundary numbers as published by HMRC:

Personal Allowance: £12,570 (full PA — tapered above £100,000 adjusted net income).
Basic-rate band: £12,570 to £50,270 (20% income tax, 8.75% dividend tax).
Higher-rate band: £50,270 to £125,140 (40% / 33.75%).
Additional-rate band: above £125,140 (45% / 39.35%).
PA taper: £1 of PA lost per £2 over £100,000 adjusted net income, fully eroded at £125,140.
Employer NI: 15% above the £5,000 Secondary Threshold (Finance Act 2024).
Employee NI: 8% main band (£12,570–£50,270), 2% above.
Class 4 NI (sole traders): 6% main band, 2% above. Class 2 voluntary: £3.45/week (£179.40/yr).
Corporation Tax: 19% small profits rate (≤ £50,000), 25% main rate (≥ £250,000), 26.5% effective marginal in between.
Dividend Allowance: £500 at 0%.
Pension Annual Allowance: £60,000 (tapered to £10,000 above £260,000 adjusted income).

For this specific row, the binding constraints are: the umbrella's employer-NI deduction (15% above £5,000) and the 40% higher-rate income-tax band on the PAYE side.

The engine's computed bottom line for this row, given those binding constraints: net cash £51,468, pension £4,400, effective rate 36.5%, marginal rate 42%.

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 — IT 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

Why does the umbrella deduct employer NI before paying me?

Because the umbrella is your legal employer for tax purposes inside IR35. The contract rate paid to the umbrella covers the umbrella's employer-side costs first (employer NI at 15% above £5,000, plus its own margin / fee), then the residual is paid to you as a "deemed salary" through PAYE. The contractor is the economic incidence of the employer NI — it always was, but inside IR35 it is explicit on the payslip.

What tax year do these figures use?

2026/27 UK tax year (6 April 2026 – 5 April 2027), England, Wales and Northern Ireland rates. Scottish tax bands are not modelled in this calculation — Scotland has a separate Starter / Basic / Intermediate / Higher / Advanced / Top band schedule that will be added in a future batch.

What is the "deemed salary" inside IR35?

It is the figure the umbrella treats as your gross salary after deducting its own fee and employer NI from the contract value. Inside IR35, the contractor does not legally have a separate Ltd Co — the relationship is, for tax purposes, "deemed employment." The deemed salary is what PAYE income tax and employee NI are calculated on.

What if I have rental income alongside this self-employment?

Add it to the `otherIncome` field of the calculator. Property income is taxed at non-savings, non-dividend rates (so stacks alongside salary in the band schedule). The first £1,000 of rental income can also be sheltered by the separate Property Allowance under FA 2017 s.16.

Can I take more than the optimum out of the company?

Of course — every £1 above the optimum simply costs more in tax than it gains in cash. The optimiser tells you the maximum-net-wealth point, not a legal limit. Past the optimum the marginal cost of extraction climbs steeply (60% effective in the PA-taper band, 39.35% additional-rate dividend above £125,140).

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.