NOx Calculator Ireland

Enter NOx Emissions (mg/km): Rate per mg/km (€):

✅ NOx Calculator Ireland – Calculate Your Vehicle’s NOx Charge Instantly

The NOx Calculator Ireland helps you quickly estimate the Nitrogen Oxide (NOx) charge payable when importing a car into Ireland or calculating the NOx component of Irish VRT (Vehicle Registration Tax). This easy-to-use tool gives you an accurate NOx fee based on your vehicle’s NOx emissions in mg/km, making it essential for anyone buying, importing or registering a car in Ireland.

Whether you’re bringing a vehicle from the UK, EU or Japan, understanding the NOx levy is crucial because this charge can significantly increase the total cost of registering a car with Revenue Ireland.

For more tools related to vehicle cost estimation and Irish motoring taxes, visit our Transport & Finance Calculators section.

⭐ What Is the NOx Charge in Ireland?

The NOx Charge is a tax applied by Revenue Commissioners Ireland as part of the VRT system to reduce air pollution from harmful Nitrogen Oxide emissions.
Every vehicle has a specific NOx emission value (mg/km) listed on the CoC (Certificate of Conformity), UK V5C, or from an emissions test.

Higher NOx = Higher tax.

Ireland introduced the NOx levy to encourage the use of cleaner, low-emission vehicles and discourage older diesel imports.

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⭐ How to Use the NOx Calculator Ireland

Using the calculator is simple and takes less than 10 seconds:

Enter your vehicle’s NOx emissions (mg/km)
– Found on your V5C logbook, CoC document, or emissions certificate.
Enter the NOx rate (€/mg)
– Default value is provided, but you can edit it anytime.
Click “Calculate NOx Charge”
– The calculator instantly displays your estimated NOx charge in euros (€).
Use this estimate to plan your full VRT cost
– Combine with your CO₂ VRT and OMSP value for a complete cost breakdown.

This calculator works on all devices—phone, tablet and desktop—making it ideal for car buyers, garages and importers.

⭐ How the NOx Charge Works in Ireland

The NOx tax is calculated based on your vehicle’s NOx emissions (mg/km) multiplied by a fee rate per mg.

Formula:
NOx Charge = NOx Emission Value × Rate per mg/km

Depending on the specific NOx value, Revenue applies different taxation bands.
However, this calculator supports both simple custom rate calculation and can be upgraded to the official tiered Irish NOx structure if needed.

The NOx levy applies to:

Imported cars
Vehicles with high NOx emissions
Older diesel vehicles
Pre-NCT tested vehicles without NOx values

The final NOx fee is added to your overall VRT obligation.

⭐ Why Use This NOx Calculator for Ireland?

Here’s why this is the best NOx calculator for Ireland:

✔ 100% Ireland-Specific

Designed exclusively around Irish VRT rules and Revenue requirements.

✔ Instant NOx Charge Estimates

Get your NOx fee in seconds without doing manual calculations.

✔ Helps You Calculate Total VRT Cost

Use the NOx charge estimate to understand your total import expense.

✔ Saves Time & Prevents Mistakes

NOx calculations can be confusing—this tool eliminates errors.

✔ Perfect for Importers, Car Traders & Private Buyers

Especially helpful for vehicles imported from:

United Kingdom
Northern Ireland
Europe
Japan

✔ Mobile-Friendly & Easy to Use

Works seamlessly across all devices.

✔ Based on the Latest Irish VRT Guidelines

Helps you stay compliant with Revenue’s environmental taxation system.