Background Notes

Source

The vehicle licensing figures are compiled from data supplied by the Driver and Vehicle Computer Services Division of the Department of Transport. The data provide details on the number of private cars, goods vehicles, motor cycles and other vehicles licensed for the first time in each city and county council, classified by make and size, during a given month.

History

The release titled 'Vehicles Licensed for the First Time' commenced in January 1993. It replaced the series previously published as 'Particulars of Vehicles Registered and Licensed for the First Time'.

In January 1993, separate systems for vehicle registration and licensing were introduced. The Office of the Revenue Commissioners became responsible for the compilation of vehicle registrations while the Department of the Environment, Heritage and Local Government retained responsibility for vehicle licensing. In January 2008, responsibility for vehicle licensing was transferred to the Department of Transport.

Motor tax charges are determined on the basis of CO₂ emission level (using seven CO₂ bands) for all new cars registered from 1 July 2008.

The licensing process where applicable follows the registration process.

Vehicle Licensing versus Vehicle Registration

The CSO produces vehicle licensing statistics on a monthly basis. Vehicle registration data has not been published on the CSO PxStat since June 2010.

Registration and licensing figures may differ in a given month for a number of reasons, some of which are outlined below:

• Vehicles which under the previous system would have been licensed in the latter part of a particular month may not now be licensed until a later month because of the time lapse between registration and first licensing.
• Registered vehicles which are not used in a public place (e.g. tractors for use exclusively on the land) may not need to be licensed.

The question is often asked, which reflects better vehicle sales, licensing figures or registration figures?

In practice, on a monthly basis, the licensing data is probably a better reflection of sales. In some cases, a vehicle may be registered by a dealership in advance of a sale. Whereas, typically, vehicles are only licensed at the point of sale. However, if a vehicle is purchased towards the end of a month, the buyer may wish to defer collecting and licensing it until the start of the following month. So the issue is not clear-cut.

Seasonal adjustment

Seasonal adjustment for each taxation class is conducted using a direct seasonal adjustment approach. However, the overall vehicle totals are estimated using the indirect approach, i.e. the ‘Total new vehicles’ is derived by adding all the seasonally adjusted new vehicles taxation classes. The main reason for adopting the indirect approach is to attribute the monthly and annual changes in vehicle licensing to each of its taxation classes. Seasonal adjustment models are developed for each series based on unadjusted data spanning from July 1996 to the current period. These models are reviewed on an annual basis; however seasonal factors are updated each month.

The adjustments are completed by applying the X-13-ARIMA model, developed by the U.S. Census Bureau to the unadjusted data.  This methodology estimates seasonal factors while also taking into consideration factors that impact on the quality of the seasonal adjustment such as:

• Calendar effects, e.g. the timing of Easter,

• Outliers, temporary changes and level shifts in the series. 

For additional information on the use of X-13-ARIMA see https://www.census.gov/data/software/x13as.X-13ARIMA-SEATS.html

Definitions

Private cars:  The term 'private cars' in this release, refers to privately licensed vehicles which include hire, fleet and certain commercial vehicles.

New and used vehicles:  The term 'new vehicles' refers to new vehicles which are licensed for use in a public place, in this country, for the first time. 'Used vehicles' refers to used vehicles which are licensed for use in a public place, in this country, for the first time. In the main used vehicles are imported.

Exempt:  The term 'exempt vehicles' in this release, refers to vehicles which are licensed for the first time but are exempt from liability to pay road tax.

Exempt vehicles can be divided into four main categories:

• State-owned
• Diplomatic
• Fire services
• Disabled Drivers

Electric hybrid:  means a vehicle that derives its motive power from a combination of an electric motor and an internal combustion engine and is capable of being driven on electric propulsion alone for a material part of its normal driving cycle.

Plug-in electric hybrid:  means a vehicle that derives its motive power from a combination of an electric motor and an internal combustion engine, where the electric motor derives its power from a battery that may be charged from the internal combustion engine and an alternating current (AC) electric mains supply and is capable of being driven on electric propulsion alone for a material part of its normal driving cycle.

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