Business & Self-Employed Calculators

Calculate income tax, Class 2 and Class 4 NI for sole traders and self-employed individuals.

Calculate the minimum day rate needed to achieve your target take-home pay. Inside and outside IR35.

Run a monthly payroll calculation showing payslip breakdown, tax, NI, pension and employer costs.

Compare take-home pay as a sole trader vs limited company director. See full tax breakdown for both.

Side-by-side take-home pay comparison at 7 different profit levels (£20K-£100K).

Build a simple P&L statement. Enter revenue, COGS and overheads to see gross and net profit margins.

Compare your take-home pay inside and outside IR35 as a contractor working through a limited company.

Find the most tax-efficient mix of salary and dividends for limited company directors.

Calculate the break-even point in units and revenue. Find your contribution margin.

Calculate profit margin, markup percentage and selling price from cost and revenue.

Calculate asset depreciation using straight-line or reducing balance methods with a year-by-year schedule.

Calculate your VAT return — output VAT on sales vs input VAT on purchases. See amount due or refund.

Calculate statutory interest and compensation on overdue commercial invoices under UK law.

Calculate business rates from rateable value. Includes Small Business Rate Relief.

Estimate R&D tax credits for profitable and loss-making companies under the merged RDEC scheme.

Calculate CIS deductions on subcontractor invoices at 20%, 30% or gross payment status.

Track your rolling 12-month turnover against the £90,000 VAT registration threshold. See headroom remaining.

Calculate AIA, Full Expensing or Writing Down Allowance on business assets. See year-by-year tax relief.

Project monthly cash flow with income and expenses. See closing balance and lowest point.

Calculate AIA tax relief on plant & machinery spending. 100% deduction on first £1M.

Log business trips with dates and mileage. Calculate HMRC mileage allowance claim automatically.

Score your Making Tax Digital readiness across 10 key criteria. See what you still need to do.

Calculate apprenticeship levy at 0.5% of pay bill over £3M. See government top-up and total training fund.

Calculate profit margin and markup on jobs. Add VAT and generate invoice total.

Compare take-home pay as an employee vs contractor for the same total cost to the hiring company.

Calculate true cost of employment including NI, pension, training, equipment and recruitment.

Compare contractor day rate vs permanent salary. See the premium needed to match perm benefits.

Build a quote from hourly rate, hours and materials. Add profit margin and VAT.