SEATTLE (AP) — A class-action lawsuit has been filed against the Seattle-area public transit agency, claiming its collection of car-tab taxes is not allowed because the 2015 law that put a public transit expansion on the ballot is unconstitutional.

The Seattle Times reports the lawsuit filed Tuesday by seven Seattle-area residents is seeking for Sound Transit to pay back $240 million in car-tab revenue.

The lawsuit centers on how car-tab taxes are collected by the agency, which uses a system that estimates a car's value by inflating the value of newer cars, resulting in higher taxes.

The lawsuit claims that the 2015 law references an outdated formula for calculating car-tab fees.

Sound Transit spokesman Geoff Patrick says the agency is reviewing the suit and it's confident in the validity of the law.

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Information from: The Seattle Times, http://www.seattletimes.com