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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 · Annual motor tax

With CO₂ emissions of 100, this model computes Annual motor tax of 170 EUR. See the full working.

✓ 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

ShowHide the full working: 1 input, 1 computed step
100 g/km
Inputs
CO₂ emissions (g/km)100
Computed by the engine
Annual motor tax ✓ pinned170 EUR

Every computed row comes from the engine, run on the inputs above. Rows marked ✓ pinned are also fixed by a published self-test, so a change to the model that moved them would fail its own tests.

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

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.

Related calculators

United Kingdom vehicle tax · France Carte grise (registration certificate) · Germany Kfz-Steuer (car tax) · Croatia Godišnja naknada (annual road fee) · Portugal IUC (single circulation tax)

Also for Ireland: Ireland take-home pay · Ireland sole trader · Ireland VAT · Ireland annual leave

All Ireland calculators · All calculators

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