For developers and AI assistants

Use the same calculator engine as the site

These free, read-only JSON endpoints run the public site's deterministic tax and mortgage formulas. They do not expose adviser cases or call an AI model.

UK take-home pay

Calculate £50,000 gross pay. Required: salary. Optional: region=uk|scotland, pensionPct, pensionType=net-pay|salary-sacrifice and comma-separated studentPlans. Results include tax, National Insurance, pension and loan breakdowns.

Cross-border salary comparison

Compare £75,000 in the UK with the UAE. Required: gross. Optional: from and to, using UK, AE, AU, USNY, USCA or USTX. The result includes source and destination deductions, the equivalent gross salary, like-for-like difference and the dated exchange rate.

UK mortgage illustration

Illustrate affordability for £50,000 income and £40,000 deposit. Required: income1. Optional: income2, deposit, monthlyDebts, multiple, rate, termYears and region.

OpenAPI description · Methodology and primary tax sources

Use responsibly

Responses include source links, assumptions and limitations. Show those with the figure. These are estimates, not individual tax or lending advice. The website calculators stay in the visitor's browser; calls to this API send the values in the request URL, which may appear in server and CDN logs. Do not send names, case details or other personal information. The API is rate limited; contact us before bulk or commercial integration.