Apple is proposing to charge U.S. developers up to 15% when users leave an app through an external purchase link, with lower rates of 10% or 5% for certain programs and smaller developers. The proposal follows years of litigation with Epic Games and a contempt ruling that temporarily barred Apple from collecting any link-out fees. A federal judge will now decide what commission, if any, is reasonable. MacRumors reports: These proposed fees are what developers would pay when someone uses their app, taps a link in the app, and then makes a purchase on the website in the link. So if someone using the Spotify app clicked a link in the app to go to the Spotify website and then purchased a subscription, Spotify would owe Apple a 15 percent fee. Apple says the fees were calculated based on expert analysis, and they are lower than the link-out rates Google is charging in the Epic v. Google case. Apple submitted the proposal to the U.S. District Court for the Northern District of California, where Judge Yvonne Gonzalez Rogers has been tasked with determining a reasonable fee for Apple to charge for its intellectual property. The appeals court suggested the commission could be limited to the direct costs of facilitating link-outs, and under that approach, the fee would be zero. Apple says a zero commission would not reflect the value that it provides developers, and its suggested commission gives it fair compensation for the App Store platform.Read more of this story at Slashdot.