Cash contributions made to charity in 2018 and beyond are deductible up to 60% of adjusted gross income. If you have a carryover of a cash contribution because of the application of the 50% limit that applied prior to 2018, you can use the carryover in 2018 through 2025 up to the 60% limit.
Items, such as interest, state and local income and sales taxes, charitable contributions, and medical deductions, claimed on Schedule A of Form 1040. Itemized deductions are subtracted from adjusted gross income to arrive at taxable income. The amount of itemized deductions is also subject to a reduction when adjusted gross income exceeds certain limits.