UK business finance calculators
Calculate margins, cash runway, working capital, VAT balances, company tax and employer allowances.
Choose a business finance calculator
Net profit margin calculator UK
Measure profit as a share of revenue after all entered costs.
Business financeMarkup on cost calculator UK
Find the selling price needed for a chosen markup on cost.
Business financeBusiness break-even sales calculator UK
Find the unit sales needed to cover fixed costs at a chosen unit contribution.
Business financeVAT output minus input calculator UK
Calculate a simple VAT balance from output VAT and eligible recoverable input VAT.
Business financeVAT invoice total calculator UK
Build a simple invoice subtotal, discount, VAT amount and gross total.
Business financeFreelance day rate target calculator UK
Turn an annual pre-tax income target and business costs into a billable day-rate target.
Business financeSole trader monthly tax reserve calculator UK
Turn a simple sole trader tax estimate into a monthly amount to put aside.
Business financeBusiness cash runway calculator UK
Estimate how long cash covers a business’s monthly net cash burn.
Business financeWorking capital calculator UK
Measure the difference between current assets and current liabilities.
Business financeCurrent ratio calculator UK
Compare short-term assets with short-term liabilities.
Business financeCash conversion cycle calculator UK
Combine inventory, customer payment and supplier payment days.
Business financeInventory turnover calculator UK
Estimate annual inventory turns and average holding days.
Business financeEarly invoice payment discount calculator UK
Compare cash saved by an early payment discount with its simple annualised funding value.
Business financeDebt service coverage ratio calculator UK
Compare operating cash available with principal and interest payments due.
Business financeOperating profit margin calculator UK
Calculate operating margin before finance and tax from revenue and operating costs.
Business financeVAT registration turnover check calculator UK
Compare taxable rolling 12-month turnover with the UK registration threshold.
Business financeCorporation Tax with marginal relief calculator UK
Estimate 2026 Corporation Tax for a qualifying company over a full 12-month accounting period.
Business financeEmployment Allowance remaining NI calculator UK
Apply the annual allowance to eligible employer Class 1 NI liability.
Business financeApprenticeship Levy calculator UK
Estimate annual levy from the pay bill and allowance allocated to this employer.
Business financeTotal employer cost of an employee calculator UK
Add salary, standard adult employer NI and actual employer-funded costs.
Business financeWhere to start
Use the cash-flow tools for payments and receipts, and profit tools for revenue and expense measures. A positive accounting profit does not guarantee that cash is available when a bill falls due.
UK data and coverage
HMRC rules are cited for statutory thresholds and tax models. Eligibility, accounting definitions, special schemes and filing obligations must be checked separately; the models are not complete accounts or returns.
Each calculator explains the formula, includes a worked example and identifies the assumptions that can affect your result. Official rule tables and dated price references are linked on the relevant pages.
Read the data sources and calculation methodology or browse all UK calculators.