Autofill Act of 2024 This bill requires the Internal Revenue Service (IRS) to establish a program to allow taxpayers to download forms relating to individual income tax returns that are populated with return information reported to the IRS. The IRS must make such return information available not later than 15 days after it receives the information and must make such information available in both a printable document file and in a computer-readable form suitable for use by automated tax preparation software.