If your parent(s) are not planning to file a 2021 federal income tax return, they will need to complete the 2023-24 Parent Non-Tax Filer's Statement. They will also need to provide a Verification of Non-Filing Letter from the IRS for the 2021 tax year.
To obtain a 2020 Verification of Non-Filing letter, use either the IRS's Get Transcript Tool or submit a copy of Form 4506-T to the IRS with Box 7 checked. You will generally receive a copy of your letter by mail in 5-10 business days.