Legacy IRA Act This bill amends the Internal Revenue Code to expand the tax exclusion for distributions from individual retirement accounts (IRAs) for charitable purposes. The bill increases from $100,000 to $400,000 the annual limit on the aggregate amount of distributions for charitable purposes that may be excluded from the gross income of a taxpayer. The bill permits tax-free distributions from IRAs to a split-interest entity for four years after the enactment of this bill. A split-interest entity is exclusively funded by charitable distributions and includes: a charitable remainder annuity trust, a charitable remainder unitrust, or a charitable gift annuity. A charitable gift annuity must commence fixed payments of at least 5% no later than one year from the date of funding. A distribution to a split-interest entity may only be treated as a qualified charitable distribution if: (1) no person holds an income interest in the entity other than the individual for whose benefit the account is maintained, the spouse of such individual, or both; and (2) the income interest in the entity is nonassignable.