Reforms to make electric vehicle users pay their fair share of road maintenance costs should not discourage drivers transitioning away from petrol cars, the treasurer says.

Jim Chalmers held talks with his state and territory counterparts at a meeting of treasurers on Friday, where a proposal to implement a road user charge for EV drivers was on the agenda.

In a joint statement, Dr Chalmers said all governments needed to work together to introduce changes as the number of EVs on the road rose.

"Reforms should be designed to not deter the continued take-up of electric vehicles," he said.

"The reforms to the treatment of electric vehicles will ensure more equitable treatment across vehicle types and provide certainty to support investment.

"The design of reforms should be as simple as p

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