unbudgeted
/ˈʌnbʌɡdɪtɪd/Definitions
1. adjective
not included in or provided for in a budget; unplanned or unforeseen expenses.
“The company faced financial difficulties due to unbudgeted costs during the project.”
2. noun
an unplanned or unforeseen expense.
“The unbudgeted expense was a surprise to the management team.”