Currently in Ireland there are 2 systems under which road tax is calculated for passenger cars and this is always a source of confusion, hopefully the following with explain the system to you.
All cars older than 2008 have their road tax calculated based on the cars engine cc's. All cars that are 2008 or newer have their road tax calculated based on the cars CO2 emissions. The above is true in 99% of cases.
The CO2 based system came into force in July 2008 meaning new cars registered between 1 January 2008 and 30 June 2008 initially had their motor tax charged on the basis of the existing engine size (c.c.) system. However, a low CO2 emitting new car registered between 1 January 2008 and 30 June 2008 had its motor tax switched to the lower CO2 based motor tax rate on first renewal of motor tax post 1 July 2008, when the new CO2 based system commenced. New cars which were registered in the first 6 months of 2008 whose tax would be more under the new CO2 based system continue to pay motortax on the basis of engine size. "
2008 or newer
Older than 2008