Run the numbers before you make the move.
Free calculators for the questions people ask most when they start a business in the UK. They use this year's tax rates, there's nothing to sign up for, and nothing you type leaves your browser.
- How much do I need saved before I hand in my notice?
Quit your job calculator
Your monthly number, savings target and the profit your business needs before you leave.
Open the calculator - How much of my side income goes to HMRC?
Side hustle tax calculator
The tax and National Insurance your side income adds on top of your job, for 2026/27.
Open the calculator - What should I charge for a day's work?
Day rate calculator
The day and hourly rate you need to take home what you want, after tax and time off.
Open the calculator - Where am I actually up to?
Business readiness quiz
Eight quick questions about where you are now. You get one thing to do today and a free plan for your next seven days.
Take the quiz
The figures in the little previews are examples. Yours will depend on what you put in.
Prefer to read first?
Our free guides cover leaving your job, tax, pricing and finding your first customers, in plain English.
Browse the guides