Calculators
26 free tools for UK business tax. Every one runs on the server, so they work without JavaScript, and every one shows its working rather than just a number. Each states the tax year it uses and the date its rates were last checked against HMRC.
Company and Corporation Tax #
4 toolsWhat the company itself owes, and what it costs to take money out of it.
Company profit in, Corporation Tax out, with marginal relief shown.
Limited company tax calculator
Turnover in. Corporation Tax, National Insurance and take-home out.
What an overdrawn loan account costs in s455 and benefit in kind.
Limited company stamp duty calculator
Stamp duty on property bought through a company, and the relief that avoids 17%.
Paying yourself #
3 toolsSalary, dividends, or neither. The dividend rise in April 2026 changed most of these answers.
Sole trader vs limited company
The same profit run both ways, at the rates that changed in April 2026.
Enter your company profit and find the split that leaves you the most.
Contracting and IR35 #
2 toolsWhat an IR35 determination is actually worth, before you argue about it.
Inside vs outside IR35 calculator
Take home from a day rate three ways: outside IR35, inside it, or through an umbrella.
What an umbrella really keeps, separated from the employer costs that are not fees.
Employees, cars and benefits #
6 toolsThe employer side. Every one of these carries a cost the employer pays as well as the employee.
Benefit in kind on a company car, and the Class 1A your employer pays.
The flat van benefit charge, and what a double cab pickup costs as a car.
What sacrificing pay saves you, and what an electric car costs after the benefit in kind.
Every reportable benefit together, with the employee tax and the employer Class 1A.
Approved mileage at the new 55p rate, and the relief if you are paid less.
Workplace pension contributions on qualifying earnings, not on the whole salary.
Employment entitlements #
4 toolsWhat the law says a worker is owed, whether they are taking leave or losing the job.
SSP under the rules rewritten on 6 April 2026: day one, no earnings limit.
Statutory maternity pay calculator
All 39 weeks, plus what the employer reclaims at 92% or 109%.
Statutory entitlement and what it pays, for fixed days or irregular hours.
Statutory redundancy pay by age band, at the £751 weekly cap.
VAT #
1 toolThe threshold runs on a rolling twelve months, not your accounting year. That is what catches people.
Find out whether you have crossed £90,000 and when your deadline falls.
Construction Industry Scheme #
3 toolsCIS comes off labour only, and the card is what gets you through the gate.
Work out the deduction on a construction payment at 0%, 20% or 30%.
Estimate the tax refund you are owed after a year of CIS deductions.
Twenty health and safety questions, marked at the real 90% pass mark.
Invoicing and getting paid #
2 toolsRaising a compliant invoice, and what you can charge when it is not paid on time.
A compliant UK invoice or proforma, with the fields HMRC requires.
Late payment interest calculator
Statutory interest and compensation on an invoice a customer has not paid.
Running the business #
1 toolRateable value in, annual bill out, with small business rate relief applied.
Looking for an explanation instead? #
If you have a question rather than a figure, the guides cover the same ground in plain English, and the software comparisons deal with what the accounting packages charge.