The break-even calculation is the cleanest answer to the messiest question in EV ownership: does the math actually work for me? Not for the average buyer, not for the most-favorable case study in a manufacturer's press release, not for the worst-case outlier. For you, with your zip code, your state's incentives, your annual mileage, and your home electricity rate.

This page exposes every step of that math. If you find an error, tell us; we publish a changelog and verify before propagating fixes.

The formula

Break-even period (in years) is the year-1 net price delta divided by the annual operating-cost savings. Two inputs, one quotient.

## Formula **Year-1 net price delta** = (EV price − federal credit − state incentive) − gas price **Annual operating (EV)** = (annual_miles ÷ 100) × kWh_per_100mi × elec_rate **Annual operating (gas)** = (annual_miles ÷ mpg) × gas_price **Break-even (years)** = year_1_delta ÷ annual_op_savings (capped at horizon) **Net savings (horizon)** = total_gas − total_ev

If the year-1 delta is already negative — your EV after incentives costs less than the gas car — break-even is in year zero. If annual savings are negative (rare but possible for very high-tariff regions with very low gas prices), break-even is technically infinite, and we display that case explicitly.

The math doesn't lie, but the inputs can. Garbage in, garbage out — which is why every input has a verifiable default and every default is dated.

What's excluded, and why

Three large cost components are deliberately out of scope: financing, maintenance, and insurance. Each is excluded for a specific reason — not because it doesn't matter, but because including it would dwarf or distort the EV-vs-gas signal.

Financing

Auto-loan APR ranges from 3% (manufacturer-subvented promotional) to 14%+ (subprime). A $13,000 price gap financed at 6% over 60 months adds about $250 in interest annually — but at 12% it's nearly $900. Rather than ask for an APR input that most buyers don't know precisely, we surface the pre-financing comparison and let buyers layer financing on with any auto-loan calculator.

Maintenance differential

EVs avoid oil changes, spark plugs, fuel filters, exhaust-system service, and most brake wear (regenerative braking offloads the friction brakes for most stopping). They still need cabin filters, tire rotations (more often, because EVs are heavier), brake fluid flushes, 12V battery replacements, and increasingly battery liquid-coolant service. The net is roughly $400–$800/year in EV's favor, but the variance is high enough that we exclude the line rather than fake precision.

Insurance

EV insurance premiums in most US markets run 10–20% higher than equivalent ICE due to higher repair and parts costs. A dedicated insurance calculator is on the Phase 2 roadmap.

A worked example

Take a 2026 Tesla Model Y at $48,000 versus a 2026 Toyota RAV4 at $33,000, in California. Federal credit eligible at $7,500. CVRP rebate $7,500. 12,000 mi/year. EV at 28 kWh/100mi, RAV4 at 30 mpg. CA electricity at $0.326/kWh, gas at $4.68/gal. 7-year horizon.

year_1_delta = ($48,000 − $7,500 − $7,500) − $33,000 = $0 annual_ev_op = (12,000 ÷ 100) × 28 × $0.326 = $1,096 annual_gas_op = (12,000 ÷ 30) × $4.68 = $1,872 annual_savings = $1,872 − $1,096 = $776 break_even_years = $0 ÷ $776 = 0 years

In this case, after stacking incentives, the EV is already cheaper at purchase — so break-even is immediate. Net 7-year savings: $5,432 in operating cost alone, before any maintenance or insurance differential.

Sources

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