Ireland motor tax calculator
Ireland's annual motor tax for post-2008 cars is set entirely by the car's CO2 emission band.
Worked example: with CO₂ emissions of 100, this model computes Annual motor tax of 170 EUR. See the full breakdown.
✓ Verified against 2 self-test cases Updated for 2025 · sources checked 2026-08-02
How motor tax in Ireland is calculated
Motor tax in Ireland for cars registered from 2008 is based on CO2 emissions, in bands. A zero-emission car pays 120 EUR a year, rising through the bands to 2,400 EUR for the highest emitters.
Cars registered before 2008 pay by engine size instead. The calculator uses the CO2 table. Estimate, not tax advice.
Worked example
| CO₂ emissions (g/km) | 100 |
|---|---|
| Annual motor tax ✓ | 170 |
Every row is computed by the engine from the inputs above. Rows marked ✓ are additionally pinned by a published self-test vector.
Frequently asked questions
How much motor tax for a 100 g/km car?
A car emitting up to 100 g/km pays 170 EUR a year in the CO2 band table.
Is motor tax based on CO2 or engine size?
For post-2008 cars it is CO2; older cars use an engine-cc table.
Where do I pay it?
Online at motortax.ie or at a motor tax office.
Sources
- Motor tax rates (motortax.ie) · checked 2026-08-02
Estimate. Not tax advice. The verification badge means the model reproduces the stated formula through 2 self-test cases; the sources support that the formula matches the rules.
Check the arithmetic yourself: how this calculator is verified — the formula behind every derived value, the 2 test cases the engine reproduces, and what the badge does and does not claim. Also available as machine-readable JSON.
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