Road Tax Calculator by Reg: Irish Motor Tax Checker

The table below summarises the key official resources for checking Irish motor tax by registration.

How to check motor tax price?

Checking your motor tax price takes less than two minutes if you have your registration number. The Motor Tax Office (run by local authorities under the Revenue Commissioners) maintains the official online calculator at motortax.ie. You can also check by vehicle type on motortaxinfotype.do if you don’t have your reg to hand.

Using official motortax.ie lookup

The registration-based lookup pulls your exact vehicle specifications from the Motor Tax database, which means the rate it shows is definitive — not an estimate. According to MotorTax.ie, the tool works by matching your Vehicle Registration Number against the registered details, so any errors in the lookup usually trace back to a data entry issue at registration time rather than a calculator problem.

If your reg lookup fails, you can fall back to the last six digits of your Vehicle Registration Certificate (VRC) or chassis number. Some local authority websites like Kildare County Council motor tax calculator also host the same lookup form.

Steps for registration number entry

1. Go to motortax.ie/OMT/motortaxinforeg.do
2. Enter your full vehicle registration number (including county prefix)
3. Click submit to retrieve your current motor tax rate
4. If the system doesn’t match, try the last six characters of your VRC or chassis number

For most drivers, the reg lookup is all you need — but having your VRC digits as a backup prevents frustration if there’s a data mismatch.

How is Irish road tax calculated?

Irish motor tax uses different calculation bases depending on when your vehicle was first registered. Carzone’s guide (updated 1 January 2025) breaks down the three applicable systems.

Factors like CO2 emissions

For vehicles registered from 1 July 2008 onwards, motor tax is calculated using CO2 emissions — but the measurement standard depends on your registration date. Vehicles registered between 1 July 2008 and 31 December 2020 use the NEDC (New European Driving Cycle) standard, while vehicles registered from 1 January 2021 onwards use the WLTP (Worldwide Harmonised Light Vehicle Test Procedure), which generally produces higher recorded emissions figures for the same vehicle.

The shift to WLTP matters practically: a car that registered under NEDC in 2020 may show a different emissions reading than the same model registered fresh in 2021 under WLTP, even if nothing physical changed about the engine.

Engine size for older vehicles

For vehicles manufactured before 1 July 2008, motor tax is based on engine capacity in cubic centimetres (cc). Rates range from €199 annually for engines up to 1,000cc, climbing to €1,809 for engines over 3,001cc. These engine-based rates have remained stable for many categories since 1 January 2013, according to MyWheels.ie detailed band tables.

Commercial vs private rates

Private vans and commercial vehicles follow different rate structures. Commercial vehicles are typically taxed based on engine size rather than CO2, and the annual rates for heavier commercial vehicles run higher than equivalent private cars. Carzone motor tax guide 2025 notes that private vans may use either CO2 or engine cc depending on their registration category and weight.

What is the motor tax rate in Ireland 2026?

Motor tax rates in Ireland are updated annually, and the Carzone guide updated 1 January 2025 provides the most current confirmed figures. For 2026, any changes would typically be announced in the October budget before the affected year.

Projected changes from 2025

The last major rate changes occurred on 1 January 2021, when vehicles in CO2 bands C through G faced increases. MotorTax.ie official lookup warned renewal notice holders to check their updated band. Whether Budget 2025 introduced further motor tax adjustments for 2026 has not been formally confirmed on Revenue.ie.

CO2 banded rates

Based on current confirmed rates (2025 figures), the NEDC-based annual motor tax structure runs from €120 for Band A0 (0 g/km CO2) up to €2,350 for Band G (225+ g/km). The WLTP equivalents tend to map to similar cost bands, with WLTP 201-225 g/km at €1,250 annually.

Use calculator for estimates

Rather than manually cross-referencing band tables, most drivers find it faster to run their reg through MotorTax.ie official reg lookup or check the rates by vehicle type on Carzone’s tax tables. The official calculator always reflects the most current rates.

Until Revenue formally announces 2026 changes, the 2025 rates are your safest reference point — and the online calculator will update automatically once new rates take effect.

How can I calculate my tax?

Calculating your motor tax depends on which calculation method applies to your vehicle. Three routes are available: the official online calculator, the text service, and manual rate tables.

Online via motortax.ie

The official registration lookup is the fastest route. It accepts your vehicle registration number and returns your current rate and available tax periods (3 months, 6 months, or 12 months) within seconds. The Motor Tax Office states that this method pulls directly from your registered vehicle data.

By reg or chassis number

You can enter either your full vehicle registration number or, if that fails to match, the last six characters of your Vehicle Registration Certificate or chassis number. This fallback option is especially useful if you’re calculating tax for a newly imported vehicle or one with a data discrepancy.

For new vs second-hand vehicles

For brand-new vehicles, motor tax is paid at first registration and then renewed annually. For second-hand vehicles purchased in Ireland, motor tax transfers with the vehicle — but ownership changes can alter the tax class and rate, particularly if the vehicle is re-registered in a different category. MotorTax.ie official lookup advises checking your current rate after any ownership transfer.

The pattern: Ownership changes are the most common reason drivers discover they’ve been on the wrong tax band — not because the vehicle changed, but because the database record wasn’t updated.

How do I find my tax calculation?

If you need more detail than the reg lookup provides — such as the specific CO2 band your vehicle falls into or how it compares to other vehicles of the same type — the type-based lookup and published rate tables offer more transparency.

Vehicle type lookup

MotorTax.ie hosts a separate vehicle type lookup tool that shows rates by vehicle category rather than by individual registration. This is useful for comparing what a vehicle would cost before purchasing, or for checking whether your current vehicle is correctly classified.

Rates by engine or CO2

Carzone’s comprehensive rate tables and MyWheels.ie detailed band tables publish the full band structures for both NEDC and WLTP vehicles, plus engine-cc rates for older vehicles. These tables are the clearest reference for understanding which band your vehicle sits in and what the annual charge is.

Commercial vehicle specifics

Commercial vehicles follow a distinct rate schedule. Engine size remains the primary basis for many commercial vehicle categories, and the rates are generally higher than equivalent private car CO2 bands. Carzone motor tax guide 2025 details that private vans taxed on engine cc can range from €199 to €1,809 depending on capacity, while commercial goods vehicles follow their own rate tables.

Vehicle type lookup and published tables give drivers the full picture when they need to evaluate a purchase or verify their current classification.

Motor Tax Renewal Steps

Renewing your motor tax online is straightforward once you know the steps. Here is the practical walkthrough based on the official MotorTax.ie process.

Step-by-step renewal process

1. Locate your current motor tax disc or registration number — you will need your vehicle registration number
2. Visit motortax.ie/OMT/motortaxinforeg.do and enter your reg number
3. Confirm the vehicle details and current rate displayed match your expectations
4. Choose your preferred tax period: 3 months, 6 months, or 12 months
5. Complete payment via the online portal (debit/credit card accepted)
6. Print or save your tax disc confirmation for your records

The renewal process takes minutes online, and choosing annual rather than quarterly payment saves money over the course of a year.

What Drivers Are Saying

In Ireland, Motor and Road Tax prices are based on three different assessments; engine size if your car was manufactured before July 2008, CO2 emissions output (NEDC) if your car was registered between 1st July 2008 and 31st December 2020, or CO2 emissions output (WLTP) if your car was registered after January 1st 2021.

— Carzone Advice (Auto News Publisher)

Please note that vehicles who are taxed on CO2 Emissions (Bands C to G inclusive), and whose tax disc commences from 1 January 2021 are subject to a motor tax rate increase.

— MotorTax.ie (Official Government Service)

Drivers benefit most by running their reg through motortax.ie — the official tool pulls directly from registered vehicle data, so the result reflects what the Motor Tax Office actually has on file for that vehicle.

The table below shows confirmed 2025 motor tax rate bands across all vehicle categories.

Related reading: Compare Gas and Electric – Costs Performance and Savings Guide · HM Revenue & Customs – Guide to Services, Contacts and Login

While motortax.ie offers quick checks by reg number, this Irish road tax calculator guide breaks down CO2 emissions bands and engine size rates for 2025-2026.

Frequently asked questions

Drivers who take a few minutes to run their reg through motortax.ie before renewal avoid surprise charges and stay compliant — the tool shows exactly what the Motor Tax Office has on record for their vehicle.