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A state Assembly Republican plan to implement a flat income tax in Wisconsin by 2029 would give most filers tax cuts but raise them on some others, while giving a big break to high earners in the long term, a new analysis shows.

The tax plan was introduced last week by Rep. Dale Kooyenga and 40-plus Assembly GOP colleagues as part of a broader measure that also would boost funding for roads.

The analysis released Tuesday by the nonpartisan Legislative Fiscal Bureau shows how the plan would affect Wisconsinites based on their incomes. While the proposal stretches over 12 years, its implications for the next two years are most critical because that’s the period for which the current Legislature and governor are able to shape the state tax code.

Democrats quickly pounced on the analysis, saying it shows Assembly Republicans want to help the wealthiest taxpayers — even while sticking some middle-class Wisconsinites with higher tax bills.

“If you were trying to design a plan to take money from those in the middle of the economic ladder to give to those at the top of the economic ladder, this accomplishes the trick,” said Assembly Minority Leader Peter Barca, D-Kenosha.