Short answer
Add every certain contract payment and plausible return cost. Do not merely divide by months: compare the same use period and mileage with the net depreciation of buying.
Important variables
- Equal holding period and mileage
- Net sale proceeds and contract cost
- Energy, maintenance and insurance
- Liquidity and finance rate
Worked example
€399 × 36 months plus €3,500 upfront and €1,190 delivery equals €19,054 before excess mileage and return cost.
Break-even: What changes the result?
Test the main driver as a cautious, central and optimistic range. Also check whether the ranking reverses at a crossover or remains robust across the range.
Common mistakes
- Comparing monthly payments only
- Treating resale as certain
- Omitting one-offs or mileage
Sources & assumptions
- Bundesministerium der Finanzen — Steuerbefreiung für Elektroautos (2026-08-17)
- RATIOXA — Methodology and formulas (2026-08-17)
Continue learning
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