NEVER pay to complete the FAFSA; the FAFSA is always free. As a matter of fact, that’s what the first F stands for:
Free Application for Federal Student Aid.
If you plan to submit the form online, be sure to file at FAFSA.gov, and avoid sites that offer to file your FAFSA for a hefty fee. Always check for the “.gov” to make sure you’re in the right place!