Business Calculators
Free tools to help you make smarter financial decisions. Calculate your tax, claim late payment interest, and compare business structures — all based on current 2025/26 UK rates.
Tax Set-Aside Calculator
Find out how much to save from each invoice for Income Tax and National Insurance (2025/26 rates).
Based on 2025/26 tax year rates. Class 2 NI has been abolished. This is a simplified estimate — consult an accountant for your full tax position. Read our full guide →
Late Payment Interest Calculator
Calculate the statutory interest and compensation you can legally claim on overdue invoices under UK law.
How this is calculated:
- Statutory interest rate: 11.75% per annum (8% + Bank of England base rate of 3.75%)
- Fixed compensation: £70 (for debts £1,000–£9,999.99)
- Under the Late Payment of Commercial Debts (Interest) Act 1998
Based on the current Bank of England base rate of 3.75%. Applies to B2B transactions only. Read our guide to getting paid on time →
Sole Trader vs Limited Company
Compare your tax bill as a sole trader versus running a limited company. See which structure saves you more (2025/26 rates).
Sole Trader
Limited Company
Ltd Company assumptions: Optimal salary of £12,570, remaining profit taken as dividends. Corporation Tax at applicable rate. Does not include accountancy fees (typically £1,000–£2,000/year) or Companies House filing fee (£13/year).
This is a simplified comparison. Read our full guide →
Want more practical guides?
We write jargon-free guides for UK sole traders — tax, banking, invoicing, and more.
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