An instrument which allows public officers to increase expenditure within a year is

An instrument which allows public officers to increase expenditure within a year is called a supplementary budget. A supplementary budget is a budget that is added to the original budget for a fiscal year. It is used to accommodate unforeseen expenses or to allocate additional funds for priority projects. The supplementary budget process allows public officers to increase the amount of money available for spending during the current fiscal year. This helps ensure that public funds are used effectively and efficiently to meet the changing needs of the government and its citizens.