Iowa Code Title VIII. Transportation [Chs. 306-330B] § 321.26. Multiple registration periods and adjustments

1. There are established twelve registration periods for the registration of vehicles by the county treasurer. Each registration period shall commence on the first day of each calendar month following the month of the birth of the owner of the vehicle and end on the last day of the twelfth month.

2. The county treasurer may adjust the renewal or expiration date of vehicles registered in the county when deemed necessary to equalize the number of vehicles registered in each twelve-month period or for the administrative efficiency of the county treasurer's office. The adjustment shall be accomplished by delivery of a written notice to the vehicle owner of the adjustment and allowance of a credit for the remaining months of the unused portion of the annual registration fee, rounded to the nearest whole dollar, which amount shall be deducted from the annual registration fee due at the time of registration. Upon receipt of the notification the owner shall, within thirty days, surrender the registration card and registration plates to a county treasurer, except that the registration plates shall not be surrendered if validation stickers or other emblems are used to designate the month and year of expiration of registration. Upon payment of the annual registration fee, less the credit allowed for the remaining months of the unused portion of the annual registration fee, the county treasurer of the county where the vehicle is registered shall issue a new registration card and registration plates, validation stickers, or emblems which indicate the month and year of expiration of registration.

3. Except for motor trucks or truck tractors registered by the county treasurer pursuant to sections 321.120, 321.121, and 321.122, vehicles subject to registration which are owned by a person other than a natural person shall be registered for a registration year as determined by the county treasurer.