Cybersecurity contractor on £140,000

Personal Ltd Co. Outside IR35. Age 38. 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

£56,804

Pension

£60,000

Effective rate

16.6%

Marginal rate

33.8%

What a cybersecurity contractor on £140,000 of company profit actually takes home

A cybersecurity contractor running a personal Ltd Co with £140,000 of profit before director pay (2026/27 rUK rates) can extract that profit as some mix of salary, dividend and employer pension. The joint optimum — the combination that produces the highest net wealth — pays £12,570 as salary, £52,476 as dividend and £60,000 as an employer pension contribution. Total tax + NI through the chain comes to £23,196 — an effective rate of 16.6% on company profit.

The "rule of thumb" baseline — £12,570 salary, no pension, max dividend — leaves £31,698 on the table at this profit level. That gap is the value of solving the four-band salary problem (LEL / PT / ST / £12,570) jointly with the pension decision rather than picking each one independently.

The five tax lines that produce the optimum

Corporation tax: £13,818 on £66,295 of post-pay profit.
Employer NI: £1,136 on the £12,570 salary (15% above the £5,000 Secondary Threshold).
Employee NI: £0 on the same salary (8% main band, 2% above £50,270).
Income tax: £0 on the salary (rUK bands, after personal allowance).
Dividend tax: £8,242 on the £52,476 dividend (8.75% / 33.75% / 39.35% bands, stacked above salary).

Net cash to the director: £56,804. Pension contribution (locked until age 55, rising to 57 from 6 April 2028 per the Finance Act 2021): £60,000. Net wealth on the all-£1-is-equal view: £116,804.

The numbers, line by line

Optimum salary	£12,570
Optimum dividend	£52,476
Optimum pension	£60,000
Net cash (optimum)	£56,804
Net wealth (cash + pension)	£116,804
Rule-of-thumb net cash	£85,106
Rule-of-thumb net wealth	£85,106
Saving vs rule of thumb	£31,698
Effective rate on profit	16.6%
Marginal rate (next £1 dividend)	33.8%

Why this scenario is different

Compared to the closest peer profile — Software contractor at £140,000 — 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

Is the figure on this page net of accountancy fees?

Yes when relevant — the take-home calculator deducts an umbrella fee for inside-IR35 rows (£1,500/yr assumed) and the optimiser allows for an arbitrary annual business expense pot (£3,500/yr default for Ltd Co rows). Sole-trader rows assume the higher of £800/yr or 5% of turnover as actual business expenses, which approximates a low-overhead service business.

Are dividends "double taxed" because corporation tax was already paid?

Yes — but the dividend tax rates (8.75% / 33.75% / 39.35%) are set lower than the equivalent income-tax rates (20% / 40% / 45%) precisely to account for the corporation tax already paid at company level. The combined CT + dividend tax stack is usually still cheaper than the salary stack of income tax + employer NI + employee NI for any single £1, which is why the optimiser puts most extraction through dividends.

How do I avoid the 60% taper?

For a salaried employee: salary sacrifice into pension. For a Ltd Co director: employer pension contribution. For a sole trader: personal pension contributions (which reduce adjusted net income). The taper-zone marginal of 60% means each £1 of pension contribution effectively costs the saver 40p of foregone cash — the strongest tax shelter the UK code currently offers.

Should I take dividends now or wait until next tax year?

Tax-year-end timing matters: a dividend declared in March 2027 is taxed at 2026/27 rates; one declared in April 2027 falls into 2027/28 (potentially still in the same calendar year). If your 2026/27 personal income is bunched in basic-rate territory and 2027/28 will be in higher-rate, accelerate. If the reverse, defer. The mathematical structure is "level the tax-band utilisation across years if income is volatile."

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.

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.