Does electrifying the fleet pay back?

Businesses converting fleets to electric vehicles face a substantial upfront premium (5,000-15,000 per vehicle vs petrol equivalent) offset by lower fuel, maintenance, and tax costs. This calculator shows fleet-level ROI over any time horizon.

A 10-vehicle fleet with 8,000 EV premium per vehicle (total 80,000 upfront) saving 1,500 fuel + 800 maintenance + 1,200 tax benefits annually per vehicle (35,000 total fleet) over 5 years: total benefit 175,000, net fleet ROI 95,000, payback 2.3 years.

Fleet economics work better than individual EV ownership because: higher annual mileage amplifies fuel savings, commercial charging infrastructure reduces per-vehicle cost, and tax benefits (Benefit in Kind at 2% on EVs vs 30%+ on petrol equivalents) are substantial for company cars. Payback is often under 3 years for high-mileage fleets.

A worked example

Try the defaults: fleet size of 10, ev premium per vehicle of 8,000, annual fuel savings per vehicle of 1,500, annual maintenance savings per vehicle of 800. The tool returns 95,000.00. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.

What moves the number most

The result responds to Fleet Size, EV Premium per Vehicle, Annual Fuel Savings per Vehicle, Annual Maintenance Savings per Vehicle, and Annual Tax Benefits per Vehicle. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.

The formula behind this

Total premium = fleet size × premium. Annual benefit per vehicle = fuel + maintenance + tax savings. Annual fleet benefit = per-vehicle × fleet size. Net ROI = total benefit - total premium. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.

Running the sensitivity

Energy prices, usage patterns, and grant availability all move the payback figure. Test at least two scenarios — current rates and a rate 20% higher — to see whether the decision holds up across plausible futures.

What this doesn't capture

Carbon reduction, health benefits, and local air quality have real value the financial figure doesn't price. The calculation gives the money side honestly; for the full picture, note the non-financial benefits alongside.