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Como o cálculo funciona
These are general-information defaults, not tax advice. The US standard mileage rates and the UK HMRC Approved Mileage Allowance Payment rates are reviewed periodically — the IRS announces new business/medical/charitable rates each December for the following year, and HMRC AMAP rates, while historically stable for long stretches, can also change.
Always verify the exact current-year rate at irs.gov (US) or gov.uk (UK) before filing a return or submitting an expense claim — the values here are editable so you can drop in the confirmed figure.