BizCalc UK

Premium Business Tools for UK Founders

A suite of premium calculators and tools — VAT, PAYE, invoicing, cashflow, margins and more. HMRC-aware. Designed for clarity.

Invoice Generator

Create HMRC-compliant UK invoices with automatic VAT.

Measure return on investment for projects and campaigns.

Project monthly inflows, outflows, and runway.

Find the volume where revenue covers costs.

UK income tax and NI for any pay period.

Gross-to-net take-home pay with tax bands.

Set selling price from cost and target markup.

True cost of an employee including NI and pension.

Gross and net margin from revenue and cost.

Extract net and VAT from a gross figure.

Add or remove UK VAT at standard or reduced rates.