Senate Republicans appear to have made a $289 billion mistake in last minute additions to the tax bill they passed in the early morning hours of Saturday morning. Which, according to some experts, could result in a massive tax rise for corporations as opposed to the cuts that President Donald Trump and the Republicans were aiming for.
The issue is around the the corporate alternative minimum tax (AMT), which is meant to stop companies from zeroing their tax bills every year. The alternative rate is lower, at 20%, but doesn't allow companies to take out as many tax breaks as the regular rate, which was 35%. Every tax year, corporations must calculate both the AMT and regular rate and pay the higher of the two.
Initially, the GOP were going to scrap the AMT all together, but decided to throw it back in at the last minute to raise additional revenue for Republicans who were afraid that the tax bill would increase the deficit.