The 2018 tax brackets
In President Trump's campaign tax plan, he proposed reducing the number of tax brackets
from seven to three, and the House of Representatives' original tax reform bill contained
four brackets. However, the final bill kept the seven-bracket structure but with mostly lower
Standard deduction and personal exemption
While it's being sold as a tax cut, the higher standard deduction really falls more under the category of a simplification. Yes, the standard deduction has roughly doubled for all filers, but the valuable personal exemption has been eliminated. For example, a single filer would have been entitled to a $6,500 standard deduction and a $4,150 personal exemption in 2018, for a total of $10,650 in income exclusions. Under the new tax plan, they would just get a $12,000 standard deduction. Is it better? Yes. But it's not really "doubled."
Having said that, here's a comparison between the standard deductions of the new and old tax laws.
Tax Filing Status Previous Standard Deduction (Set to take effect in 2018) Single $6,500 Married Filing Jointly $13,000 Married Filing Separately $6,500 Head of Household $9,350