Royalty/Payment on a free game?

My friend is looking to switch to ue4 from java and is wondering if there is a initial charge or royalty on a game that is planed to be release as free to play. Any information on the subject or links to were we could read more is appreciated. Thank you.

If it’s free then no, there’s no fee/royalty, all of the info is on the main website

Obviously, if there are later payments for DLC, or other monetisation methods, then the 5% licencing fee will be incurred by any payments above $3,000 per quarter (per game).