Why reverse-calculate from take-home?
Most people think in terms of net income — what actually lands in their bank account each month. But billing clients, setting day rates and accepting contracts all happen in gross terms. Working backwards from a net target to a gross turnover lets you make rate decisions and revenue plans that actually match your lifestyle goal — especially when UK marginal tax rates stack to 62% in the personal allowance taper band.
How the solver works
The calculator runs a binary search over possible gross turnover values, using the same tax engine as our Take Home Pay Calculator. For each trial value it computes the full tax stack — corporation tax, dividend tax, income tax, NI — and checks whether the resulting net matches your target. It converges on the right answer in under 20 iterations.
The solver is precise to within £50 of your target net. For the limited company path it uses the optimal 2025/26 strategy: £12,570 director salary plus dividends drawing the rest of post-corporation-tax profit. For sole trader it applies income tax and Class 4 NI directly to profit.
A contractor wanting £60,000 net per year (£5,000/month) as a limited company director needs roughly £96,000 of gross turnover. At 220 billable days, that’s a day rate of £436. Note the personal allowance starts to taper above £100,000 gross — push the net target to £6,500/month and required gross jumps to £130,000, or £590/day. The taper band is where rate negotiation gets really important.— GoForma technical team, 2025/26 tax year modelling
What the model leaves out
- Allowable expenses — business travel, software, training, professional fees. These reduce taxable profit, so your required gross is lower than the calculator shows by roughly the expense amount.
- Pension contributions — company-paid employer pension contributions reduce corporation tax. Model these separately if you’re aggressive on retirement saving.
- Student loans — sole traders have student loan deducted via Self Assessment at 6% or 9% above the relevant threshold; add this to your effective tax rate.
- Scottish residency — Scottish taxpayers have different income tax bands (currently six rates, up to 48%). Our calculator uses England, Wales and NI rates only.
- IR35 — the Ltd scenario assumes outside IR35. If your work would be inside IR35, use our Contractor Outside IR35 Calculator instead — the inside-IR35 tax rate is materially higher.
Using this for day-rate setting
The day-rate number the calculator gives you is the minimum viable rate to hit your target take-home — it doesn’t include any cushion for bench time, holidays (beyond the 220-day assumption), illness, new-business downtime or accountancy fees. Most experienced contractors add a 10–15% buffer to the calculated rate when setting their minimum acceptable price.
If you bill by hour, the daily rate ÷ 8 gives a floor hourly rate for a standard working day. Add the buffer before sending it to a client.