Reducing taxes increases demand and works against the Federal Reserve here.
The US needs a credible tax policy otherwise no one will buy Federal Government Debt. How does the government source money? Via taxes or new debt issuances.
Without sufficient taxes you cannot issue more government debt. UK just had this issue, EU looks like it’s next. Maybe even the USD after that.
But if you were an economic planner the equations involved here are really simple. The more cash you push out to consumers, the harder it is to fight inflation. You could make an argument that it is neutral to inflation if you believe this would mean a cut in government spending that was proportional to the increase in consumer spending, but back here in reality, the government just spends what ever it's going to spend on deficit and prints debt so the meaningful metric is private sector liquidity.