Revenue estimates detailed in the budget are raised through the Malaysian taxation system, with government spending representing a sizeable proportion of the overall economy.
Each year, the various departments and agencies that make up the Government submit what are called 'The Main Estimates' to The Treasury Board Secretariat.
These documents identify the planned expenditure of each department and agency, linking these proposed expenses to programs, to objectives and ultimately to the priorities of the current ruling Government.
From there, the Cabinet and Prime Minister's Department adjust the budget based on a series of economic, social and political factors.
The government reserves the right to submit "supplementary supply bills", which add additional funding above and beyond what was originally appropriated at the beginning of the fiscal year.
Supplementary supply bills can be used for things like disaster relief and to update its agencies' spending totals for the current financial year and report any governmental re-organisations.