Typically prepared on an annual basis, the budget is the expected expenditure in the building over the forthcoming financial year.  The budget is then portioned among leaseholders under the appropriate apportionment details in their Leases.  Actual spend during the year at a property is closely monitored compared to budget.  At the end of the year there is likely to be either a Surplus compared to budget (less money was spent than anticipated) or a Deficit compared to the budget (more money was spent than anticipated).