Designer on £45,000

Sole Trader. Age 32. Plus £12,000 of other personal income stacking below. 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

£33,473

Pension

£0

Effective rate

20.6%

Marginal rate

46%

Designer vs Ltd Co director at £45,000 — what changes

The decision a designer faces at £45,000 of income for 2026/27 is rarely "which calculator do I use" — it is "which legal structure leaves the most money in my pocket after tax." This page resolves the question for one specific scenario by running the relevant engines side-by-side at build time, so every number that follows is reproducible from a single CSV row and the BracketMath source code.

On the sole-trader route, taxable profits are £42,750 after the trading allowance / actual expenses decision, producing £33,473 of net cash after income tax + Class 4 + voluntary Class 2.

Incorporating instead — Ltd Co at the same turnover and expense pot — would produce £32,060 of net cash. The gap of £1,413 is in favour of the sole-trader route — at this turnover level the corporation-tax + dividend stack offers no edge over self-assessment. Against that gap, weigh the ~£800–£1,500/yr accountancy overhead, the public Companies House filing burden, and the loss of the trading allowance.

For a complete walk-through of the optimisation for this specific scenario, see the comparison table further down this page.

The numbers, line by line

Turnover	£45,000
Taxable profits	£42,750
Trading allowance vs actual expenses	Actual expenses
Income tax	£7,287
Class 4 NI	£1,811
Class 2 NI (voluntary)	£179
Net cash (year)	£33,473
Net cash (monthly)	£2,789
Hours-equivalent at NLW (£12.21/hr)	2,741 hrs
Effective rate	20.6%
Same turnover as Ltd Co (no pension)	£32,060
Incorporate vs stay sole trader	£1,413 for staying sole trader

Why this scenario is different

Compared to the closest peer profile — Freelance writer at £45,000 — this scenario sits £0 higher on gross income. That moves net cash by −£1,251, the pension contribution by +£0, and the effective rate by +2.8%. The shift in effective rate is large enough that the binding tax constraint has changed — probably crossing a band boundary. Taxable profits change from £42,750 to £42,750 (after the trading-allowance / actual-expenses choice).

Questions this scenario raises

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.

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.

What does the "marginal rate" mean on this page?

It is the rate paid on the next £1 of gross income added to this scenario. For this row that figure is 46.0%. The marginal rate is always higher than the average effective rate — it is the right number for "is one more invoice worth it" decisions.

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.