Freelancer Day Rate Calculator
The formula behind this calculator is: (Desired take-home income + tax & NI on that income + annual business expenses) ÷ billable days per year = minimum day rate. The tricky part isn't the arithmetic — it's that tax and National Insurance depend on your total taxable profit, which itself depends on how much you charge, so the calculator works it out by testing profit levels until the take-home after tax matches what you asked for.
The other number that catches people out is billable days. A freelancer working five days a week, 52 weeks a year, doesn't have 260 billable days — holiday, sick days, gaps between contracts, and non-billable admin time all eat into that. Most freelancers can realistically bill somewhere between 60% and 75% of their total working days once all of this is accounted for.
A common shortcut is to take a previous employee salary, divide by roughly 220-260 working days, and call that the day rate. This under-prices almost every freelancer, for three reasons: an employer also pays Employer's National Insurance and pension contributions on top of your salary, which disappear the moment you go freelance and need to be replaced by your rate; you won't bill every working day, so the same annual income needs to come from fewer billable days; and you now have to cover your own business costs — software, insurance, equipment, accountancy — that an employer previously absorbed.
Working from take-home income backwards, as this calculator does, avoids all three traps at once by building tax, non-billable time and expenses into the figure from the start rather than bolting them on afterwards.
This calculator uses sole trader Income Tax and Class 2/4 National Insurance rules, since that's how most new freelancers start out. If you trade through a limited company instead, the tax treatment is different — Corporation Tax on profit, then a mix of salary and dividends to extract income personally — so the exact day rate needed to hit the same take-home will differ. The gap is usually modest for lower income levels and widens at higher income levels, where limited company structures tend to become more tax-efficient.
If you're working through an agency or on a contract that might fall inside IR35, use the IR35 Calculator alongside this one, since an inside-IR35 contract is taxed much closer to employment and will need a meaningfully higher day rate to hit the same take-home.
Priya wants £42,000 a year take-home as a freelance copywriter. She plans to work five days a week for 46 weeks a year (230 working days), but reckons on 25% of that time going to admin, pitching and invoicing rather than billable client work — leaving 172.5 billable days. Her annual business costs (laptop, software subscriptions, professional indemnity insurance, an accountant) come to around £2,400.
Working backwards: to have £42,000 left after Income Tax and Class 2/4 National Insurance, she needs a taxable profit of roughly £53,221. Adding back her £2,400 of expenses means she needs to bill £55,621 in revenue over the year. Dividing that by her 172.5 billable days (230 working days × 75% billable) gives a minimum day rate of around £322 — and at 7.5 hours a day, an equivalent hourly rate of roughly £43.
That's the minimum figure to hit her target — it doesn't build in a buffer for slow months, rate negotiation room, or saving for a pension, all of which most freelancers add on top once they know their true floor.
This gives you the minimum day rate needed to hit a take-home target — not necessarily what the market will actually pay, and not a recommendation to charge exactly this amount. Always check what comparable freelancers in your field and experience level are charging, and build in some margin above the minimum for slow periods, annual leave you can't bill, and pension contributions, none of which are automatically included here.
It also assumes sole trader tax treatment and a single, simple income stream — if you have other income, significant pension contributions, or trade through a limited company, your actual figures will differ. Use it as a sanity-check floor, not a final pricing decision.