Massachusetts could lose out on $650 million in state revenue because of the tax breaks and spending cuts bill President Donald Trump signed over the summer, a massive budget shocker that could leave Beacon Hill Democrats scrambling to plug holes.

The revelation that Bay State budget writers could have more than half a billion less than originally projected to work with this fiscal year comes weeks before they must confirm or revise revenue expectations, and as the federal government sits on the precipice of a shutdown.

Department of Revenue Commissioner Geoffrey Snyder said the “One Big Beautiful Bill” changes over 100 provisions in the federal tax code and about 30 will trigger an impact on collections in Massachusetts.

“Overall, we project that the (One Big Beautiful Bill) will reduc

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