contingency fund
noun[C]
ukus(alsocontingency account);(alsocontingency reserve)ACCOUNTING
anamountofmoneythat iskepttopayfor something that mightpossiblyhappenorcauseproblemsin thefuture:
Theprojectedcostincreasewill come out of a $900 millioncontingencyfundincludedin the bridge's $6.3billionconstructionbudget.