High Quality Content by WIKIPEDIA articles! Vehicle Registration Tax or VRT is a tax that must be paid in Ireland when registering a motor vehicle.VRT is calculated as a percentage of the Open Market Selling Price (OMSP) of the vehicle. The OMSP is the "expected retail price" and includes all taxes (Including VAT) previously paid in the state.A new system was introduced with effect from the 1st July 2008. This system moved the VRT calculation for passenger vehicles from being calculated on engine capacity to a system calculated on CO2 Emissions. This system applies to new vehicles registered from this date as well as second hand vehicles imported after this date. Commercial Vehicles remain unaffected.