There hasn't been an ETA provided on this. It is being worked on, however very rarely do the developers release a time table for features in production. The "Important" section in this article is as much information as there is out there: https://www.quicken.com/support/how-do-i-edit-my-budget-quicken-mobile-app.
Any update, Quicken?
This reply was created from a merged topic originally titled Budget feature iOS 2018 - Is it available?.Considering switching Mac 2017 (desktop and mobile app) to Quicken 2018. The budget feature was dropped from the 2017 mobile devices. Just wondering if this feature is available for 2018 version?