5-Year Servicing Cost Projection

How 5-Year Servicing Cost Projection works

Routine servicing and statutory inspections recur every year, and their prices typically rise with inflation. This calculator multiplies each year's combined servicing and inspection cost by a compound inflation factor, then sums across the chosen period to produce a total projected expenditure. Secondary outputs include the inflated cost in the final year and the arithmetic mean cost per year.

The formula

For each year y from 0 to n – 1, the cost is (Service + Inspection) × (1 + g)^y, where g is the decimal inflation rate. The tool sums these values:
Total = Σ [(Service + Inspection) × (1 + g)^y] for y = 0 to n – 1.
Average per year is Total ÷ n. Final-year cost is (Service + Inspection) × (1 + g)^{n – 1}.

Where this method is most accurate

The calculation assumes a fixed annual service schedule and a constant nominal inflation rate applied each year. It is most reliable when inflation expectations are stable and the vehicle requires no major unscheduled repairs. For older cars or those under warranty with differing service intervals (e.g. every two years), adjust the annual service input accordingly or model multiple scenarios.

What this tool does not do

It does not forecast actual repair costs, component failures, or unscheduled maintenance. The tool applies the same inflation rate to both service and inspection costs; in practice, labour and parts may inflate at different rates. It does not account for service-plan discounts, warranty coverage, or jurisdiction-specific inspection frequencies beyond what the user models in the inputs.

Disclaimer

This calculator is an educational projection tool. It does not constitute financial or vehicle-maintenance advice. Actual servicing costs depend on the specific vehicle, mileage, service history, parts pricing, and market conditions. Users remain responsible for verifying service intervals and costs with their garage or manufacturer.