Data scientist contractor on £170,000

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

£71,413

Pension

£60,000

Effective rate

22.7%

Marginal rate

33.8%

How much tax does a data scientist contractor on £170,000 actually pay in 2026/27?

Short answer: £38,587 per year — an effective rate of 22.7% on gross company profit.

What's in that number? For a Ltd Co director the figure is the sum of five lines: corporation tax (£21,768), employer NI (£1,136), employee NI (£0), personal income tax (£0) and dividend tax (£15,684). The optimiser placed £12,570 of salary, £74,526 of dividend and £60,000 of employer pension contribution to produce that figure — the lowest total in the searched grid.

What's the marginal rate on the next £1? 33.8%. 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 £170,000 salaried employee in 2026/27 is roughly £73,100 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

Optimum salary	£12,570
Optimum dividend	£74,526
Optimum pension	£60,000
Net cash (optimum)	£71,413
Net wealth (cash + pension)	£131,413
Rule-of-thumb net cash	£97,776
Rule-of-thumb net wealth	£97,776
Saving vs rule of thumb	£33,637
Effective rate on profit	22.7%
Marginal rate (next £1 dividend)	33.8%

Why this scenario is different

Compared to the closest peer profile — Salesforce consultant at £170,000 — 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

Why does the page link to specific other professions?

The five linked pages at the bottom are computed by a similarity metric over (profession, income, structure, age band) — the closest five neighbours in that space, not the same five pages every row links to. The aim is a genuine cross-link graph rather than a star pattern that search engines correctly read as a pSEO signal.

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.

Why does the optimiser want such a large pension contribution?

Because employer pension contributions dodge three taxes simultaneously: corporation tax (deductible), employer NI (none), and personal income tax / NI / dividend tax (none until drawdown). For this row the optimiser allocates £60,000 to pension — the largest tax shelter available to a director.

Does taking a £nil salary cost me a State Pension year?

Yes, if you take £0 salary and pay no Class 2 (sole traders) or Class 3 (Ltd Co directors) you will not earn a qualifying year for that tax year. Take at least the Lower Earnings Limit (£6,500 in 2026/27) as salary to earn a qualifying year automatically. Most directors take £12,570 (full PA) anyway, well above the LEL.

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.

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.