Last May at its Build 2018 developer conference, Microsoft promised that it would be offering up to 95% revenue share for sales in its Windows 10 Store. While the change was promised to come by the end of the year, a number of people noticed that it did not. Fortunately, Microsoft has updated its developer agreement today to reflect the change.
Basically, developers gets 95% of revenue generated as long as the purchase wasn't the result of Microsoft's own systems. For example, if your app is purchased from a search in the Microsoft Store, you'll only get 85%.
Microsoft recommends making sure your URL traffic uses referrals, called CIDs. However, if there's no CID or OCID, you'll still get 95%. This could happen if your app is discovered through a web search.
This applies to purchases made on Windows 10 PCs, Windows Mixed Reality, Windows 10 Mobile, and Surface Hub. It does not include Xbox consoles. If you're a developer, there should be an updated agreement waiting for you.