Our free NZ mileage calculator helps you estimate the IRD deduction reimbursement for business vehicle travel using the kilometre rate method. Simply enter your total kilometres, business kilometres, vehicle type and income year, and the calculator applies the correct IRD rates, including the two-tier system based on the 14,000 km threshold. It’s designed for tax and reimbursement calculations rather than fuel economy, and while the calculator provides an estimate, you’ll still need to keep a vehicle logbook to support your claim.