Electric fleet total cost of ownership: the real 2026 breakdown

The total cost of ownership of an electric fleet is decided by five lines: depreciation and financing, energy, maintenance, tax and insurance, and charging infrastructure. Depreciation is the biggest, but energy is the one most fleets get wrong because they pay public roaming prices when home charging is up to 5x cheaper.

Over a typical 5 to 7 year life, a well-run electric fleet lands roughly 20 to 40% below an equivalent diesel fleet on operating cost. This guide is for CFOs and fleet managers who want the number that actually holds up in a budget review, not a sales figure.

What total cost of ownership really means for an electric fleet

Total cost of ownership is the full cost of running a vehicle over its life, not its sticker price. For an electric fleet it splits into five lines, and treating any of them in isolation is how budgets slip.

Depreciation and financing is almost always the largest share, so the acquisition decision sets the ceiling on everything else. Energy is the line with the widest spread between a good outcome and a bad one, because the same kilometre can cost three to five times more depending on where the car is plugged in.

Maintenance is structurally lower than on combustion vehicles and rarely surprises anyone. Tax and insurance depend heavily on your country and your benefit-in-kind rules.

Charging infrastructure is the line CFOs overestimate, because a software-based approach to home charging removes the need to buy hardware per vehicle. The table below shows indicative shares and, more usefully, who inside your organisation actually controls each line.

Shares are indicative and vary by country, mileage and vehicle mix [TO CONFIRM against your own fleet data]. The point is not the exact percentage, it is that the two lines you can move the most, energy and infrastructure, are the two most fleets manage the least.

Depreciation and financing: the line you lock in on day one

Depreciation is the largest single cost of an electric fleet, and it is decided the moment you choose a vehicle and a financing structure. The value here is that this line is fixed early and hard to change later, so it deserves the most scrutiny before signature.

Residual values for electric company cars have stabilised in Europe as the used market matures, but they still vary sharply by model, so a residual assumption that is 5 points optimistic can quietly erase your energy savings. The buy versus lease question is the other half of this line: leasing converts an unknown residual into a fixed monthly cost and moves depreciation risk off your balance sheet, while buying keeps the upside if residuals hold.

We break the trade-off down in detail in leasing vs buying electric company cars. For a CFO, the takeaway is simple: model this line with conservative residuals and a real financing rate before you touch any other assumption.

Energy: the line most fleets get wrong

Energy is where electric fleets either win or leak money, and most leak it. The reason is that the cost of a kilowatt-hour is not a fixed number, it depends entirely on where the car charges.

Home charging on a domestic tariff runs around 0.15 to 0.25 euro per kWh, while public DC fast charging can sit at 0.45 to 0.70 euro per kWh or more [TO CONFIRM for your market]. That is a gap of up to five times for the exact same energy.

Studies consistently show 80 to 90% of charging naturally happens at home or at the depot when vehicles return there overnight, which is exactly where the cheap kilowatt-hours are. So the mistake is rarely that the fleet chose the wrong car.

The mistake is that it lets drivers default to public roaming charging because home charging feels too complicated to reimburse, and in doing so it pays the most expensive rate for the majority of its energy. Get this line right and per-kilometre energy cost lands 60 to 80% below diesel.

Get it wrong and much of that advantage disappears.

Getting the energy line right: home charging reimbursed at actual cost

The way to fix the energy line is to make home charging the default and reimburse it accurately, at the real cost of the kilowatt-hours consumed. The value for a CFO is direct: you move the bulk of your energy spend from public prices to home prices, and you do it without buying a single piece of hardware.

The blocker has always been the paperwork. Reimbursing a driver for electricity drawn from their own home meter sounds like a compliance headache, which is why many fleets avoid it and overpay on public networks instead.

This is the specific problem Voltaback solves. It tracks each home charging session by vehicle, in software, on any installation, whether the driver has a wallbox, a standard socket, a flat with shared parking or solar panels, and it generates a compliant monthly justification so the driver is reimbursed at actual cost, to the cent.

Reimbursement is backed by a URSSAF ruling and the metering accuracy is verified by Bureau Veritas with a 1.22% average relative error, which is what makes the figure defensible in an audit. There is no charger to install and no box to fit per car.

We cover the mechanics in home charging reimbursement for EV fleets.

The hidden cost: untracked home charging

The most dangerous line in an electric fleet TCO is the one that never appears in the model: home charging that nobody measures. When a fleet has no clean way to track and reimburse home charging, one of two things happens, and both cost money.

Either drivers are pushed onto public charging because it is the only spend the company can see and expense, which quietly triples the cost of most of the fleet's energy, or drivers are reimbursed on a flat monthly allowance that is either too generous, so the company overpays, or too stingy, so drivers charge in public anyway. There is also a compliance exposure: a flat allowance that does not match real consumption can be treated as taxable income rather than a genuine expense reimbursement.

Making this line visible and precise is often worth more than the vehicle choice itself, because it turns an uncontrolled cost into a measured one you can actually manage.

• Public charging default: up to 5x the home rate on the majority of your energy, the single most common leak.
• Flat allowance too high: you overpay every driver, every month, with no link to real use.
• Flat allowance too low: drivers charge in public anyway, so you pay twice.
• No audit trail: a lump-sum allowance can be reclassified as taxable income rather than a reimbursed expense.

Electric vs ICE: how the numbers actually compare

Compared like for like over a full life, a well-run electric fleet beats a diesel one on total cost, but the margin is earned on the running lines, not the purchase price. Acquisition and financing usually start higher for electric, and the gap is closed by energy and maintenance.

Energy per kilometre runs 60 to 80% below diesel when charging is done right, and maintenance sits 30 to 50% lower because there is no engine oil, no exhaust system and far less brake wear thanks to regeneration. Add favourable benefit-in-kind and tax treatment for electric company cars across most of Europe, and the payback against diesel typically lands in the 3 to 6 year range for fleets with normal to high mileage.

The tax side varies a lot by country and is a real part of the number, so it is worth reading alongside tax advantages for electric company cars across Europe. The table below shows where the electric fleet gives ground and where it makes it back.

Written by Aubin Aycaguer, Chief of Staff at Voltaback. Voltaback helps more than 180 companies, including over 15% of the CAC 40 such as Equans, BNP Paribas, Lyreco and Sodexo, track and reimburse home charging at actual cost, in software, with no hardware.

If you want to see what tightening the energy line does to your own fleet TCO, book a demo.