Furthermore, many grant programs require you to complete the Free Application for Federal Student Aid (FAFSA). The FAFSA asks about your tax information, and if you have unpaid taxes, it will be flagged. This might not automatically disqualify you, but it could significantly affect your eligibility for certain grants.
In short, while there isn't a blanket rule, owing back taxes dramatically reduces your chances of receiving a federal grant. It's crucial to address your tax debt before applying for financial aid. Contacting the IRS to create a payment plan is highly recommended.