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Free tools
Quick calculators and checkers for the rules that catch small businesses out. They’re free, there’s no sign-up, and everything is worked out on your own device, so nothing you type is sent anywhere.
Sole traders and the self-employed
Self-employed tax calculator
Income tax and Class 4 National Insurance on your profit for 2026/27, and how much to put aside each month.
TAXPayments on account calculator
What you pay on 31 January and 31 July, and whether you can reduce it.
MTDMaking Tax Digital checker
When you have to start keeping digital records and sending quarterly updates.
MILEAGEMileage allowance calculator
What you can claim for business miles at HMRC’s approved rates.
CISCIS calculator
The 20% or 30% deduction on labour, and your likely refund at the end of the year.
Running a business
VAT calculator
Add or remove VAT, and check the £90,000 registration threshold with the date to register by.
INVOICEInvoice generator
Make a proper invoice and print it or save it as a PDF. Nothing is stored.
GETTING PAIDLate payment interest calculator
The interest and fixed compensation you can charge a business that pays late.
Limited company directors
Salary vs dividends calculator
Compare director’s salaries with dividends for 2026/27 and see which leaves you most.
DIRECTORSs455 calculator
Tax on an overdrawn director’s loan account at 33.75% or 35.75%, and the date to repay by.
Holiday lets, venues and transport
Visitor levy calculator
The levy on a booking in Edinburgh, Glasgow, Aberdeen, Stirling, West Dunbartonshire or Cardiff.
VENUESMartyn’s Law checker
Is your venue in scope, and is it the standard or enhanced tier?
TRANSPORTTachograph download checker
When the next driver card and vehicle unit downloads are due under the 28 and 90 day rules.
Want it all in one place?
The calculators give you a quick answer. Our spreadsheets keep your records for the whole year and do the sums as you go, in Excel or Google Sheets. See them all on Etsy.