Unreal 4 its free?

Unreal engine 4 its free for indie developers and non comercial use?

"How much do I have to pay for Unreal Engine 4?

UE4 is free to use, with a 5% royalty on gross product revenue after the first $3,000 per game per calendar quarter from commercial products. Read the EULA FAQ for more details."

"Are any revenue sources royalty-free?

Yes! The following revenue sources are royalty-free:

Ancillary products, including t-shirts, CDs, plushies, action figures and books. The exception is items with embedded data or information, such as QR codes, that affect the operation of the product.
Consulting and work-for-hire services using the engine. This applies to architects using the engine to create visualizations as well as consultants receiving a development fee.
Non-interactive linear media, including movies, animated films and cartoons distributed as video.
Cabinet-based arcade games and amusement park rides.
Truly free games and apps (with no associated revenue)."

so if I do not have a profit I do not pay?

so if I do not have a profit I do not pay?