Unlike deductions for charitable contributions to IRS-recognized organizations, there is no income tax deduction for gifts you make to individuals. What’s more, if gifts of cash exceed the annual gift tax exclusion—$15,000 in 2021; $16,000 in 2022—you must file Form 709, but in most cases no gift tax will be owed because of the lifetime exclusion.
On Form 1040X, you may file an amended return within a three-year period to claim a refund or correct a mistake made on an original or previously amended return.