Pay
Marginal and effective tax rates: what each one tells you
Last updated 16 October 2026
Your effective rate is all your tax as a share of pay; your marginal rate is the tax on your next euro. On €50,000 in 2026 they are very different.
Two rates describe how much tax you pay, and they answer different questions. Mixing them up is the most common reason people misjudge a pay rise or a pension contribution.
Effective rate: how much of your pay goes in tax
Your effective rate is your total income tax, USC and PRSI for the year divided by your gross pay (pay before tax). Because the first slice of income is covered by credits and the low USC bands, it is always well below the headline rates.
Marginal rate: what your next euro costs
Your marginal rate is the tax on an extra euro of pay. Once your income is over the 20% band (€44,000 for a single person in 2026), each extra euro is taxed more. It pays 40% income tax, 3% or 8% USC and 4.2% PRSI.
| Salary, single, 2026 | Effective rate | Rate on the next €100 |
|---|---|---|
| €20,000 | 3.6% | 42.8% |
| €35,000 | 14.5% | 27.2% |
| €50,000 | 20.7% | 47.6% |
| €75,000 | 29.9% | 52.2% |
| €100,000 | 35.5% | 52.3% |
| €150,000 | 41.1% | 52.2% |
The marginal rates here are averages over the next €100 of yearly pay, with PRSI blended across the October rate change. So they can differ slightly from the headline rates.
Which one to use
- A pay rise, bonus or overtime: use the marginal rate. On €50,000, a €1,000 rise leaves you a little over half of it.
- A pension contribution: it saves income tax at your marginal income tax rate (20% or 40%), but not USC or PRSI.
- A deduction such as flat rate expenses or remote working relief: worth your marginal income tax rate.
- A credit such as health expenses or rent: worth 20% whatever your marginal rate, because it is a credit rather than a deduction.
- Comparing countries or budgets: the effective rate shows the overall burden.
Where the marginal rate jumps
- at €13,000, where USC starts to apply to all income, not only the excess
- at €352 a week, where PRSI starts on all pay, softened by the PRSI credit up to €424
- at the 20% band, where income tax goes from 20% to 40%
- at €70,044, where USC goes from 3% to 8%
Moving into the 40% band never means all your income is taxed at 40%: only the part above the band is. A rise always leaves you better off than before.
Work it out
Sources
- Revenue: Tax rates, bands and reliefs (checked 25/10/2026)
- Revenue: Standard rates and thresholds of USC (checked 25/10/2026)
- Department of Social Protection: PRSI 2026 Contribution Rates and User Guide (SW 14) (checked 25/10/2026)
General information, not tax advice. HeyPenny is not a tax agent.