Final answer:
The deduction limit for charitable contributions made in cash by an individual taxpayer to public charities is 10% of their AGI.
Step-by-step explanation:
The limit for deducting charitable contributions made in cash to public charities is 10% of the taxpayer's Adjusted Gross Income (AGI). This means that an individual taxpayer can claim a deduction on their federal income tax return for the amount of cash donations made to qualifying public charities, but the total deduction amount cannot exceed 10% of their AGI.
This limit serves as a cap, ensuring that benefits from charitable contributions do not disproportionately offset the taxpayer's income.