Methodology & Sources

How we calculate running costs

• Energy / Fuel: EV charging blends home rate (with solar offset) and public DC rate by your input percentages. ICE fuel cost = L/100km × annual km × petrol price.
• Servicing: Annual estimate from manufacturer service schedules, sourced from Green Vehicle Guide.
• Insurance: Estimated by vehicle category (1–5): $1,200–$2,800/yr.
• Registration: State baseline rego, minus any EV concession, plus road user charge for EVs where applicable.
• Depreciation: Linear residual value model. EV: 48% residual after 5yr. ICE: 55% residual after 5yr.

Novated lease calculation

For novated leases, we estimate the annual pre-tax lease payment and apply your marginal tax rate (including Medicare levy) to compute tax saved per year and net weekly take-home impact. EVs under the LCT threshold are FBT exempt under the 2022 Treasury Laws Amendment.

Data sources

Assumptions

• EV residual value: 48% after 5 years
• Petrol car residual value: 55% after 5 years
• Petrol CO₂ emissions factor: 2.31 kg/L
• Grid CO₂ intensity: NSW 790 g/kWh, VIC 970, QLD 800, WA 700, SA 380, TAS 50, ACT 0, NT 650
• Solar charging assumed zero marginal cost
• Public charging rate is per kWh, inclusive of session fees

Change log