To ensure that International Registration Plan (IRP) registrations are evenly staggered throughout the registration year, all NEW IRP accounts will be assigned the renewal month of March, and ad valorem taxes for these accounts should be collected through March 31 of each year.
Ad valorem tax must be collected for each IRP registered vehicle through the end of the renewal month assigned to the IRP account (refer to memo 2014-19).
The month of March will be the default assigned renewal month for new IRP accounts during the period November 1, 2022, thru October 31, 2023.
If you have any questions concerning IRP, call 334-242-9000, option 3.
Original source can be found here.