You may be eligible for a zero dollar payment on your federal student loan(s) under an Income-Driven Repayment plan if you meet certain criteria. Typically you would meet a zero dollar payment if your income is below the poverty level. It's best to see if you meet the criteria by going through the Savi tool to see what your repayment plan estimates may be.
It's important to note, if you're working towards Public Service Loan Forgiveness (PSLF), zero dollar payments do count towards PSLF credits, as long as it's while you're on an Income-Driven Repayment plan, you’re continuing to work for a qualified employer (non-profit or government), and that is your scheduled payment during that time. If you make any payments above zero while you are eligible for zero dollar payments while pursuing PSLF, those extra payments may not benefit you. This is because you will be seen as paid ahead and your monthly count towards PSLF will not be correct. Any amount paid ahead while pursuing PSLF equates to smaller forgiveness once you’ve fulfilled the eligibility criteria for the program.