The motor insurance tax shall be paid at the same time as the insurance on the vehicle, and is thus distributed on as many terms as the liability insurance (traffic insurance) is paid: monthly, quarterly, half year or full year.
Your insurance will normally be renewed each year, but will not follow the calendar year. When you renew an insurance with effect from 1st of March, the motor insurance tax that you pay from this date will be the new rate for this year.