Advance Colorado has filed a lawsuit in Denver District Court, challenging the constitutionality of legislation passed in this year's the group claims violates the Taxpayer's Bill of Rights.

The lawsuit challenges two provisions contained in House Bill 25-1296 , which made several adjustments to tax expenditures.

The plaintiffs included state Sen. Barbara Kirkmeyer, R-Brighton, Fremont County Commissioner Kevin Grantham, a former Senate president, and two employees of El Paso County who are entitled to overtime pay.

It's the overtime pay provision of HB 1296 that is an issue in the lawsuit.

According to the court filing, the law contains a new tax related to overtime.

Under the law, any amount of overtime excluded or deducted from federal gross income must be added to the taxpayer'

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