Generally? It doesn't.

See making the call to tip off the cops makes you eligible for the reward. If you called the correct tip/reward phone number. So that's the first road block.

Even then, you aren't automatically getting the reward. No. There are still hoops to jump through.

As a note these additional hoops also apply when there isn't a specific phone number.

According to the FBI's website, I'd link but I'm on my phone, someone (an agent, a prosecutor, etc) has to put your name forward in a nomination package.

This is then reviewed by the FBI and other agencies, it's kind of vague.

Anyway these agencies decide if you get a reward and what percentage.

And none of this can start until after a conviction is secured.