# Calculators we actually use in the product.

> Canonical page: https://briefcase.so/tools
> Briefcase content index: https://briefcase.so/llms.txt

Free HMRC calculators used in Briefcase. Mileage claims and CIS deductions, no signup.

Free tools

HMRC rates, no signup. Built for UK practices and the people they file for.

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Live2026/27 rates

## HMRC mileage claim calculator

Approved mileage, the 10,000-mile split, and VAT on the fuel element. Add journeys and download a receipt.

Open the calculator

](https://briefcase.so/tools/hmrc-mileage-claim-calculator)[

Live

## CIS deduction calculator

Labour after materials, plant hire and VAT. Download a payment and deduction statement.

Open the calculator

](https://briefcase.so/tools/cis-deduction-calculator)