From the Document: "By law, the President is to send the federal budget request to Congress by the first Monday in February. In practice, the President sometimes sends it later, particularly during presidential transition years. On May 28, 2021, President Joseph R. Biden submitted [hyperlink] the FY2022 budget request. Representative Adam Smith, Chair of the House Committee on Armed Services (also known as the House Armed Services Committee, or HASC) had said [hyperlink] that a budget submitted on May 10 or later could affect the timing for completion of an annual National Defense Authorization Act (NDAA) by the October 1 start of the government's fiscal year (FY)."
CRS Insight, IN11833
Congressional Research Service: https://crsreports.congress.gov/