A domestic C corporation is calculating its federal income tax liability for its 2025 tax year. Under IRC Section 11 as amended by the Tax Cuts and Jobs Act, what rate applies to its taxable income?
- A graduated rate structure with brackets ranging from 15% to 39% depending on the corporation's income level
- A flat 21% rate applied to all of the corporation's taxable income, regardless of how much or how little it earns
- A flat 15% rate applied only to the corporation's first $50,000 of taxable income, with higher marginal rates above that threshold
- A flat 35% rate applied to all taxable income, matching the top corporate rate that applied before 2018
Why B? And why not the others?
Correct answer: B. A flat 21% rate applied to all of the corporation's taxable income, regardless of how much or how little it earns
The Tax Cuts and Jobs Act repealed the old graduated corporate rate schedule for tax years beginning after December 31, 2017, replacing it with a single flat 21% rate under IRC Section 11(b) that applies to all of a C corporation's taxable income from the first dollar, with no brackets and no distinction based on income level; this remains the applicable rate for the 2025 tax year. The option describing a graduated structure from 15% to 39% accurately reflects the pre-2018 law, including its old bubble-rate mechanism, but that structure no longer exists. The option describing a flat 15% rate on only the first $50,000 wrongly imports the bottom bracket of the old graduated system into a single-bracket framing, when the current law has no brackets at all. The option describing a flat 35% rate matches the top rate under the old law before the Tax Cuts and Jobs Act took effect, not the rate in force for 2025.
Source: IRC Section 11(b), as amended by the Tax Cuts and Jobs Act of 2017 (Pub. L. 115-97)