Budget values can be set for income and expense accounts. This is an optional feature, but one that may be of use if you want to monitor and stick to a budget.
Budgets are set up using the Account Details screen.
To set a new budget for an account, choose one of the following budgeting methods from the Budgeting menu:
Set the amount per month or for each month displayed.
To monitor how close to the budget you are keeping, use the Monthly Breakdown report.