This document provides guidance for government departments on preparing their FY 2021 budgets. It announces the budget preparation forms to be used, including a new form (BP 201-G) for carry-over projects from FY 2020. Guidelines cover topics like legal bases, expenditure objects, personnel requests, and infrastructure projects. Revisions are provided for certain forms and annexes. Departments are reminded to follow submission formatting requirements and ensure hard copy and online submissions through the OSBPS match. The document aims to help departments effectively develop their FY 2021 budget proposals.