Personal trainer on £40,000

Sole Trader. 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

£31,209

Pension

£0

Effective rate

17%

Marginal rate

26%

Step by step: how the engine arrived at the bottom line

For a sole-trader personal trainer with £40,000 of turnover, the engine evaluated each stage of the Self Assessment chain in HMRC's order:

Turnover: £40,000.
Expense vs trading-allowance decision: the £1,000 trading allowance (ITTOIA 2005 s.783A) lost to actual expenses and was discarded.
Taxable profits: £38,000.
Income tax: £5,086 (rUK bands, after Personal Allowance).
Class 4 NI: £1,526 (6% £12,570–£50,270, 2% above).
Class 2 (voluntary): £179 — £179.40/yr, paid to maintain a State Pension qualifying year per HMRC's voluntary NI guidance.
Net cash: £31,209. Effective rate on turnover: 17%.

The numbers, line by line

Turnover	£40,000
Taxable profits	£38,000
Trading allowance vs actual expenses	Actual expenses
Income tax	£5,086
Class 4 NI	£1,526
Class 2 NI (voluntary)	£179
Net cash (year)	£31,209
Net cash (monthly)	£2,601
Hours-equivalent at NLW (£12.21/hr)	2,556 hrs
Effective rate	17%
Same turnover as Ltd Co (no pension)	£30,570
Incorporate vs stay sole trader	£638 for staying sole trader

Why this scenario is different

Compared to the closest peer profile — Freelance designer at £40,000 — 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. Taxable profits change from £38,000 to £38,000 (after the trading-allowance / actual-expenses choice).

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.

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 Personal Allowance and how is it used in this calculation?

The Personal Allowance is the first £12,570 of non-savings, non-dividend income on which no income tax is charged. It is consumed from the bottom up: salary first, then dividends. Above £100,000 of adjusted net income the allowance tapers at £1 lost for every £2 of income, fully eroded at £125,140 — producing the well-known 60% effective marginal rate inside that £25,140-wide band.

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.

Should I pay voluntary Class 2 NI even if my profits are below the threshold?

Usually yes. Class 2 voluntary contributions cost £179.40/yr (£3.45/week × 52) and buy a State Pension qualifying year. The Full New State Pension as of 2026 is £230.25/wk (£11,973/yr) and you need 35 qualifying years to get the full amount. One year of voluntary Class 2 buys roughly £342 of annual State Pension at retirement — a payback period of about 6 months on first claim.

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.