Wiktionary
filing fee
n. (context legal English): A fee assessed against a party initiating a lawsuit, or other legal process, e.g. filing a patent.
Usage examples of "filing fee".
Nothing in the laws said I couldn't, if I had the cash for the filing fee, which being the richest woman on Mars now I had of course,”.
Although the homesteader had only to pay a modest filing fee, he did have to live on the land for five years and make certain improvements-the most important of which was the construction of a dwelling.