The most common mistake new freelancers and consultants make is taking their old salary, dividing by 260 working days, and charging that as a day rate. It leaves them earning far less than employed — because a day rate has to cover a lot that a salary hid.
Why your day rate isn't your salary ÷ working days
As an employee, someone else paid for your holidays, your sick days, your pension, your equipment, your training and the time you spent not directly earning. As a freelancer, your day rate has to cover all of it — and you can only charge for the days you actually bill, which is far fewer than the days you work.
This calculator works the honest way round: start with the income you want, add your annual business costs, and divide by the number of days you'll realistically bill. That gives the rate you need to invoice to hit your target.
Nobody bills 260 days a year. Holiday, admin, chasing work, quiet spells and the odd duvet day mean a busy full-time freelancer often bills 200 days or fewer. Price for the real number, not the fantasy one.
Don't forget the taxman
One crucial thing this rate is not: your take-home. It's what you need to invoice before income tax and National Insurance. As a sole trader you'll pay those on your profits through Self Assessment, so a chunk of every invoice needs setting aside from day one — a separate tax pot is the habit that saves freelancers every January. If you're weighing up a limited company, the maths changes again, and it's worth an hour with an accountant.
Common questions
How many days a year can a freelancer realistically bill?
Fewer than most expect. After holiday, bank holidays, admin, marketing, invoicing and quiet periods, a full-time freelancer often bills around 200 days a year or fewer. Charging as if you'll bill 250+ is how people end up under-earning.
Is my day rate my take-home pay?
No. Your day rate is what you invoice before tax. You still pay income tax and National Insurance (and, if registered, account for VAT) on top, so set money aside from every invoice. Treat the rate as revenue, not salary.
Should I charge more than the calculator says?
Often, yes. This gives the minimum rate to hit your target at your assumed billable days. If demand is strong, your skills are specialist, or you want a buffer for lean months, price above it — it's much easier to start higher and discount than to raise a rate later.