VRT Glossary: Understanding Vehicle Registration Tax Terms

What Is Vehicle Registration Tax in Ireland?

Vehicle Registration Tax (VRT) is a mandatory charge levied by the Irish Revenue Commissioners when you register a vehicle in Ireland for the first time. Whether you are importing a car from the UK, buying a new vehicle from a dealer, or bringing a vehicle into the State permanently, VRT applies and must be paid before the vehicle can be legally driven on Irish roads. The amount you owe depends on several factors, including the vehicle's Open Market Selling Price (OMSP), its CO₂ emissions band, and any applicable surcharges such as the NOx levy for diesel and older petrol engines. These variables interact in ways that can make a real difference to your final bill, so understanding how each one works is essential before you commit to importing a vehicle.

Getting to grips with VRT terminology can save you real money. Knowing the distinction between OMSP and the price you actually paid, understanding how CO₂ emissions push your car into higher-rated VRT bands, or recognising when the NOx levy applies can help you choose a vehicle with a lower tax liability. Even a small shift in emissions category or a different fuel type can change your VRT by thousands of euros. For a full breakdown of how each element is calculated, see our complete VRT guide, which walks through every step of the process with worked examples.

This glossary covers every key term you will encounter when dealing with VRT in Ireland, from OMSP and CO₂ bands to reliefs, exemptions, and the NOx levy. Use the search box below to look up any term quickly, or browse the full alphabetical list to build a solid understanding of how Irish vehicle registration tax works.

How VRT Terms Fit Together

The first thing to understand about VRT is that it is not a single flat charge. The final bill is the result of several calculations that layer on top of each other. Revenue starts by assessing the Open Market Selling Price of your vehicle, which is their estimate of what the car would sell for in the Irish market rather than what you actually paid. They then apply a VRT rate based on the vehicle's CO₂ emissions band, which ranges from 7% for the cleanest cars up to 41% for the highest emitters. On top of that, the NOx levy adds a separate charge for diesel and higher-emitting petrol vehicles, calculated from nitrogen oxide emissions in milligrammes per kilometre. Various reliefs can reduce the final amount, but each relief has its own eligibility criteria and value cap.

The glossary terms below are organised into categories that reflect the main stages of the VRT calculation. The Emissions category covers CO₂ and NOx terms, the Valuation category covers OMSP and depreciation, the Rates category covers the VRT bands and percentages, and the Reliefs category covers every available discount from hybrid relief to electric vehicle exemptions. If you are new to VRT, start with the Valuation and Emissions categories because those two factors determine the bulk of your tax bill. Once you understand how the OMSP and CO₂ rate work, everything else becomes a matter of applying the right reliefs and surcharges on top.

Key VRT Concepts for Importers

If you are importing a vehicle to Ireland, there are a handful of VRT terms that matter more than any others. The OMSP determines the base value that Revenue taxes, and it can differ notably from your purchase price, especially for cars bought in markets with different pricing structures. The CO₂ emissions value is critical because one gram per kilometre can shift your car into a higher VRT band and cost you hundreds of euros. The WLTP and NEDC standards for measuring CO₂ are important because older cars may be rated under the older NEDC system, which typically produces lower figures than the current WLTP standard. Understanding which standard applies to your vehicle ensures you are using the correct rate for your VRT calculation.

The NOx levy is another term every importer should understand. Introduced in 2020, this surcharge targets diesel vehicles and older petrol cars based on their nitrogen oxide emissions. The levy starts at €5 per mg/km for the first 60 mg/km of NOx emissions and rises to €25 per mg/km for emissions above 80 mg/km. This means a diesel SUV with 120 mg/km of NOx can attract a levy of over €1,500 on top of the standard VRT. The NOx levy is one of the main reasons diesel imports have become less attractive in recent years, and it is worth checking a vehicle's NOx figure before you commit to a purchase.

VRT reliefs are the flip side of the coin and can notably reduce your bill. The electric vehicle relief provides up to €5,000 off the VRT for battery electric cars with an OMSP under €50,000. The hybrid relief reduces the VRT rate by 4% for qualifying self-charging hybrids. Plug-in hybrid vehicles get a 25% reduction in the VRT rate. There are also reliefs for disabled drivers, transfer of residence, and classic cars. Each relief has specific eligibility conditions, so checking whether your vehicle qualifies before you import can save you thousands. Use the glossary below to look up any term you encounter during the import process, and cross-reference with our detailed guide for worked examples of how each factor affects the final VRT calculation.