If you are unable to pay your tax liability in full, file the return and pay what you can by the due date. Filing on time will reduce the penalty on the unpaid balance from 10% to 5%.
You may pay online through GovConnectIowa.
If paying by check or money order, use the IA 1040V payment voucher, which is available in the Tax Forms Index by choosing the Individual Income tax type.
You will be billed for the balance after your return is processed, including any penalty and interest that may be due. We encourage you to make payment prior to receiving a bill in order to reduce the interest amount due. Interest will accrue on the first of each month until the balance is paid.
The interest rate may change yearly. Interest must be added to delinquent tax at a per month rate, beginning on the due date of the return and accruing each month until you make full payment of all tax, penalty, and interest due.