Iowa Code § 29A.61: Fines.

1. Fines may be paid to a court or to an officer executing its process. The amount of any fine imposed may be noted upon any state roll or account for pay of the delinquent and deducted from any pay or allowance due or thereafter to become due to the delinquent, until said fine is liquidated. Any sum so deducted from any state pay or allowance shall be turned in to the court which imposed the fine and shall be paid over by the officer receiving the same in like manner as provided for other fines and moneys collected.

2. The proceeds of all fines imposed by a military court or a commander administering nonjudicial punishment shall be transmitted to the adjutant general. The adjutant general shall deposit all fines and penalties received with the state treasurer for credit to the general fund of the state.