Engineering contractor on £150,000

Personal Ltd Co. Outside IR35. Age 42. Pension preference: aggressive.

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

£61,674

Pension

£60,000

Effective rate

18.9%

Marginal rate

33.8%

How HMRC defines the band this income falls into

A engineering contractor at £150,000 of gross for 2026/27 — plus any other personal income that stacks below — falls into the additional-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 corporation-tax marginal-relief band (26.5% effective marginal CT) on the company side, and the £100k Personal Allowance taper on the personal side.

The engine's computed bottom line for this row, given those binding constraints: net cash £61,674, pension £60,000, effective rate 18.9%, marginal rate 33.8%.

The numbers, line by line

Optimum salary	£12,570
Optimum dividend	£59,826
Optimum pension	£60,000
Net cash (optimum)	£61,674
Net wealth (cash + pension)	£121,674
Rule-of-thumb net cash	£89,240
Rule-of-thumb net wealth	£89,240
Saving vs rule of thumb	£32,433
Effective rate on profit	18.9%
Marginal rate (next £1 dividend)	33.8%

Why this scenario is different

Compared to the closest peer profile — IT contractor at £150,000 — 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 optimiser shifts £0 of the extraction out of the dividend slice, and £0 out of pension contributions.

Questions this scenario raises

Where does the BracketMath engine source its rates?

Income tax / NI / CT / dividend rates come from HMRC's published 2026/27 rate tables (gov.uk/government/publications/rates-and-allowances-income-tax). Pension rules come from FA 2004 and the FCA's consumer guidance. Historical investment returns used in the Monte Carlo engine come from a 125-year UK gilt + UK equity series stored in src/data/historical-returns.json. Every constant carries a source URL in the source code.

Are the numbers on this page computed live or pre-rendered?

They are pre-rendered at build time by running the BracketMath engine code against the inputs for this specific row. That means: zero JavaScript on the page for the calculation itself, the figures cannot drift if the engine is changed, and you can verify them by running the corresponding calculator with the same inputs.

Is the Employment Allowance available for a single-director company?

No. A company with only one director who is also the sole paid employee cannot claim the £10,500 Employment Allowance (HMRC manual ESM4017). For genuine multi-employee setups it is claimable and the optimiser can model it via the `claimEmploymentAllowance` flag.

Does this calculation include student loan repayments?

No. Student Loan repayments (Plan 1 / 2 / 4 / 5 / Postgraduate) are not modelled in the BracketMath engines. Plan 2 repayments at 9% above £27,295 add roughly 9p of marginal cost to each £1 of taxable income above the threshold. Add this to the marginal rate quoted on this page if you have an outstanding student loan.

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.

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.