The American Legislative Exchange Council wants Congress to make the 2017 Tax Cut and Jobs Act permanent.
The group sent a letter to lawmakers urging them to keep former President Donald Trump's tax policies in place for good. They are set to sunset at the end of 2025.
ALEC said that if Trump's tax cuts ended, it could encourage some states to increase taxes.
"If the provisions of the Tax Cuts and Jobs Act are allowed to expire, the federal tax base will once again be narrowed because the cap on the state and local tax deduction would be eliminated," according to the group's letter. "The return to an unlimited SALT deduction would be an incentive for many states to implement higher taxes and spend at higher levels under the guise of lowering the federal tax burden – a responsibility that ultimately lies with Congress."