Form 599 form 2026

1. Click ‘Get Form’ to open it in the editor.
2. Begin by filling in your name as shown on the tax return in section 1a. If it's a joint return, enter the first name listed.
3. In section 1b, provide your Social Security Number or Employer Identification Number.
4. If applicable, complete section 2a with your spouse’s name and section 2b with their Social Security Number.
5. Fill out your current address in section 3, ensuring all fields are completed accurately.
6. If you have a previous address different from your current one, enter it in section 4.
7. For third-party requests, complete section 5 with the necessary details of the third party.
8. Specify the tax return requested in section 6 and indicate if you need certified copies.
9. In sections 7 and 8, enter the year or period requested and check the corresponding fee box.
10. Finally, sign and date the form in section 10 before submitting it to ensure processing.

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