Driving & travel · Calculator companion · By K Imports
VRT & NOx import estimate: practical guide
This guide explains how to use the Count.ie vrt & nox import estimate. Calculate Category A VRT bands, minimum levies and NOx. Follow the inputs, method and worked example below, then compare your own scenario.
Guide written .
Open the VRT & NOx import estimate calculatorWhat to prepare
- Record the distance, vehicle specification and the relevant fuel or electricity price.
- Separate one-off purchase or import costs from recurring running costs.
- Use observed consumption where available and label any manufacturer's figure as an assumption.
Understand the inputs
- Propulsion
Options: Petrol / other combustion; Diesel; Pure battery electric.
- CO₂ test basis
Options: WLTP; NEDC — convert using Revenue formula.
The calculation method
CO₂ determines a percentage of OMSP with a minimum levy. The separate stepped NOx charge is then added after any applicable EV relief.
Worked example
Illustrative inputs and their result.
Example inputs
- Revenue OMSP estimate (€)
- 20000
- CO₂ emissions (g/km)
- 120
- NOx emissions (mg/km)
- 40
- Propulsion
- Petrol / other combustion
- CO₂ test basis
- WLTP
- Registration date
- 2026-10-05
- Acceptable CO₂ evidence supplied
- Yes
- Acceptable NOx evidence supplied
- Yes
- Series-production vehicle
- Yes
Calculated example result
- Total
- €3,400.00
- Co2 Charge
- €3,200.00
How to interpret the result
A running-cost or range estimate is not a guarantee of real-world performance. Weather, loading, driving conditions, charging losses and changing prices can alter the result.
Compare vehicles over the same distance and ownership period. Test a higher energy price or worse consumption before deciding that the apparent saving is dependable.
Common mistakes to avoid
- Do not mix litres per 100 km with miles per gallon, or battery capacity with energy purchased.
- Distinguish an advertised charging power from power sustained during a full session.
- Check taxes, vehicle classification and exclusions against the stated date and sources.
Assumptions and sources
OMSP is determined by Revenue, not the foreign purchase price. This excludes import VAT, customs duty, registration costs and other vehicle categories. It is an estimate, not a binding VRT assessment.
Sources and further information
If your case falls outside this scope, use a more suitable calculator or contact us about an unclear method.