From the Summary: "Every year the President submits a series of volumes to Congress containing the President's proposed budget for the coming fiscal year. The President's submission is required on or after the first Monday in January, but no later than the first Monday in February (31 U.S.C. §1105(a)). At times, the President's submission has been delayed beyond the statutory deadline. This year the President released the budget submission on May 28, 2021. This report provides brief descriptions of the FY2022 budget volumes and related documents, together with internet addresses, Government Publishing Office (GPO) stock numbers, and prices for obtaining print copies of these publications. It also explains how to find the locations of government depository libraries, which can provide both printed copies for reference use and internet access to the online versions. This report will be updated as events warrant."
CRS Report for Congress, R43475
Congressional Research Service: https://crsreports.congress.gov/