The initial court filing fee of $335 is not the only fee the bankruptcy court charges. If you have to update your list of creditors or file an amendment to your Schedule D or Schedule E/F after filing your case, the court will charge you a filing fee of $31. Just because you had your filing fee for the case waived by the court doesn’t automatically mean that you won’t have to pay the amendment fee.
The first place to check whether you’ll have to pay the fee even though you had the initial filing fee waived is the court’s order about the fee waiver. If it explicitly states that all fees are waived for you, you may not have to pay the fee for the amendment. Only very few districts include the fee for filing an amendment in the fee waiver. Most don’t.
So, it’s best to call the clerk’s office for the court where you filed your case and ask them what their policy or process is. If you think the court order regarding your filing fee waiver includes this new fee, ask them to take a look and verify that that’s indeed what it says.
Some districts provide a separate application for a fee waiver related to fees that arise after the case is filed. Ask about this when you speak to the clerk’s office. They would know whether their district does.
Finally, note that the fee for filing a motion to reopen your case cannot be waived. If your case is dismissed, you will have to pay the court filing fee to reopen it and get things back on track.