From the article that was posted:
Personal Taxes
Income Tax Rates
The law retained the old structure of seven individual income
tax brackets, but in most cases, it lowered the rates. The top rate fell from 39.6% to 37%, while the 33% bracket dropped to 32%, the 28% bracket to 24%, the 25% bracket to 22%, and the 15% bracket to 12%. The lowest bracket remained at 10%, and the 35% bracket was also unchanged.3 The income bands that the new rates applied to are lower, compared to 2018 brackets under current law, for the five highest brackets.
The changes are temporary, expiring after 2025, as is the case with most personal tax breaks included in the law. The expiration date allowed the Senate to comply with reconciliation rules that block a Democratic filibuster—which Republicans did not have the votes to defeat—only if the law does not raise the deficit in any year outside of a 10-year window and if it stays within its $1.5 trillion budget constraint during the 10-year window.
The tax cuts for individuals weren't permanent because 60 votes in the Senate were needed but the democrats wouldn't support it.