Iowa Code § 8A.508: Compelling payment.

If an officer fails to pay into the state treasury the amount received by the officer within the time prescribed by law, or having settled with the director, fails to pay the amount found due, the director shall charge the officer with twenty percent damages on the amount due, with interest on the aggregate from the time the amount became due at the rate of six percent per annum, and the whole may be recovered by an action brought on the account, or on the official bond of the officer, and the officer shall forfeit the officer’s commission.