The ability to exceed a budget is controlled by the "Cap the spending" setting. This option can be turned on or off when you create or edit a budget.
To find and manage this setting, follow these steps:
When this setting is enabled, a budget cannot be exceeded. If a user attempts to create a transaction that would cause the budget to go over its limit, the transaction will not be processed. Instead, the user will receive an error message notifying them that the budget has been exceeded.
This is the default setting. When the cap is off, a budget can be exceeded. The transaction will be processed, and the budget's analytics will show how much it has been overspent. Additionally, an admin or approver will be able to see exactly how much the budget will be exceeded when they review the transaction.