Under pre-Act law, corporations are subject to graduated tax rates of 15% (for taxable income of $0-$50,000), 25% (for taxable income of $50,001-$75,000), 34% (for taxable income of $75,001-$10,000,000), and 35% (for taxable income over $10,000,000). Personal service corporations pay tax on their entire taxable income at the rate of 35%.

New law. For tax years beginning after Dec. 31, 2017, the corporate tax rate is a flat 21% rate.