The whole number, before you sign the offer letter

Kinetic Ledger is an independent instrument for UK employers who would rather see the full cost of a hire before the offer letter goes out. The salary on the contract is almost never the figure the business actually pays, so every tool here is built to surface the number that does — employer National Insurance, workplace pension, statutory pay, benefits in kind and the quiet on-costs that land in the bank account long before they appear on a payslip.

The platform brings together 22 free calculators and a growing set of plain-English field notes, all tuned to the official 2026/27 tax year rates. It is built for founders, finance leads, HR managers and operations teams at small and growing UK businesses — anyone who has to quote a budget, model a pay rise, or work out what a contractor, a part-time hire or a company car really costs. It is deliberately not built for accountants: it is a planning instrument, not a filing tool, and every figure is guidance rather than formal tax advice.

Kinetic Ledger is built and maintained by a small, independent team. Rates are checked against HMRC, The Pensions Regulator and the Department for Work and Pensions, and every calculator links to its official source so you can verify any number it returns. If a figure ever looks wrong, that link is the quickest way to confirm it — and the contact page is the quickest way to tell us.