Electrician on £50,000

Sole Trader. Age 38. 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

£38,239

Pension

£0

Effective rate

18.5%

Marginal rate

26%

Worked example: Electrician, 38, £50,000 of turnover

Picture a electrician aged 38 for the 2026/27 tax year, trading as a sole trader with £50,000 of turnover. The optimisation goal for this profile is a balance of cash and pension contribution (modest pension preference, treating £1 of pension as £0.50 of cash for the search).

Running the engine for this exact profile:

Taxable profits after the trading-allowance choice: £47,500
Income tax: £6,986
Class 4 NI: £2,096
Class 2 (voluntary): £179
Net cash: £38,239 (18.5% effective on turnover)
Same turnover as a Ltd Co (no pension): £37,592 — a gap of £647 in favour of staying a sole trader

The vignette is hypothetical but the numbers are not — every figure above was produced by the same engine code that powers the live BracketMath calculators, run at build time on inputs drawn from a single CSV row.

The numbers, line by line

Turnover	£50,000
Taxable profits	£47,500
Trading allowance vs actual expenses	Actual expenses
Income tax	£6,986
Class 4 NI	£2,096
Class 2 NI (voluntary)	£179
Net cash (year)	£38,239
Net cash (monthly)	£3,187
Hours-equivalent at NLW (£12.21/hr)	3,132 hrs
Effective rate	18.5%
Same turnover as Ltd Co (no pension)	£37,592
Incorporate vs stay sole trader	£647 for staying sole trader

Why this scenario is different

Compared to the closest peer profile — Freelance developer at £50,000 — 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 £47,500 to £47,500 (after the trading-allowance / actual-expenses choice).

Questions this scenario raises

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.

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.

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.

How do I model my partner's income alongside mine?

BracketMath models a single tax entity — there is no joint-couple calculation. For couples, the practical approach is to run each partner separately and consider income-splitting strategies (employing the lower-earning spouse for genuine work performed, sharing dividends if both are shareholders, etc). The Ltd Co spousal share pattern is sketched in /guides/ltd-company-director-tax.

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.