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California’s top-end taxpayers — already steamed over a recent hike in the nation’s highest state income tax — are now fuming over a new $120 million retroactive tax grab on small business owners.

In December, the state’s tax authority determined that a tax break claimed over the past few years by 2,500 entrepreneurs and stockholders of California-based small businesses is no longer valid and sent out notices of payment.

“How would you feel if you made a decision, which was made four years ago, (and) you absolutely knew was legally correct and four years later a governing body came in and said, ‘no, it’s not correct, now you owe us a bunch more money. And we’re going to charge you interest on money you didn’t even know you owed’,” Brian Overstreet told Fox News from his office north of San Francisco.