His businesses benefited from more generous write-offs for the interest on loans, as well as large deductions for equipment. Trump personally benefited from lower rates and a near elimination of the alternative minimum tax, a feature that prohibited many wealthy taxpayers from taking too many credits and deductions. With the change, Trump could claim more write-offs.
Yet some features of Trump’s signature law also hurt him. For example, in 2019, his return says, he paid $8.4 million in state and local taxes, but could only claim $10,000 under his tax law. The following year was similar: $8.5 million paid but subject to the $10,000 cap.