Business Owner Calculators
Manage business finances with profit margin, break-even, VAT, and business tax calculators.
Essential Financial Calculators for UK Small Business Owners
Running a small business in the UK means juggling VAT returns, corporation tax, payroll costs, and profitability analysis — all while trying to actually run the business. Understanding the key rates and how to calculate your liabilities can prevent nasty surprises and help you price correctly from day one.
Corporation Tax Rates 2025/26
Corporation tax in the UK has a two-rate structure. Companies with profits under £50,000 pay the small profits rate of 19%. Companies with profits over £250,000 pay the main rate of 25%. Profits between £50,000 and £250,000 benefit from marginal relief, which tapers the effective rate between 19% and 25%.
VAT Rates and Schemes
| VAT Rate | Rate | Applies To |
|---|---|---|
| Standard | 20% | Most goods and services |
| Reduced | 5% | Energy, children's car seats, some home improvements |
| Zero | 0% | Food, books, children's clothes, new homes |
| Exempt | N/A | Insurance, finance, education, health |
Employer Payroll Costs (True Cost of Hiring)
When hiring, the true cost of an employee exceeds their gross salary. Employers pay National Insurance at 15% on earnings above £5,000 per year (from April 2025 — the threshold was reduced from £9,100 under the October 2024 Budget). On a £30,000 salary this means approximately £3,750 in employer NI. Add pension contributions (minimum 3% auto-enrolment = £722) and the true cost is around £34,472 for a £30,000 salary.
Break-Even Analysis
Break-even = Fixed Costs ÷ Contribution Margin per Unit. Contribution margin = selling price minus variable costs per unit. Knowing your break-even point tells you the minimum sales volume needed to cover all costs — essential when pricing new products or evaluating new hires. Use it alongside your gross profit margin to understand profitability at different revenue levels.