Most of the gap is opened by Ireland's Irish Non-Dom Remittance regime, which displaces the standard schedule. Both countries are indicated in USD at the displayed FX.
Costa Rica uses a territorial system — only locally-sourced income enters the tax base, while Ireland taxes residents on worldwide income — a structural difference that shapes how each country treats foreign-source income. Ireland's top marginal rate of 40% is 15 percentage points above Costa Rica's 25%, making the statutory gap one of the largest variables in this comparison.
| Personal income tax dn_visa · 0% flat | — |
| Social security 10.7% employee · uncapped | $10,670 |
| Total deductions | $10,670 |
| Gross income | $100,000 |
| Net take-home | $89,330 |
| Personal income tax progressive · top 40% | — |
| Social security 4.3% employee · uncapped | $4,275 |
| Total deductions | $4,275 |
| Gross income | $100,000 |
| Net take-home | $95,725 |
On a $100k single-resident employment profile under each country's default schedule, Costa Rica produces the lower effective burden at 28.3% versus 30.4% in Ireland — a 2 percentage-point gap that compounds to roughly $2,025 of additional take-home annually. The 15-point spread in top statutory rates is the primary driver; above their respective thresholds, each additional dollar is taxed at 40% in Ireland but only 25% in Costa Rica. Social-security contributions also differ: Costa Rica charges 10.7% versus 4.3% in Ireland, adding a second layer to the effective-rate spread that doesn't show in the income-tax brackets alone.
| Instrument | Costa Rica · USD | Ireland · USD | Δ (IE − CR) |
|---|---|---|---|
I. Personal income tax | |||
Personal income tax CRdn_visa · 0% flatIEprogressive · top 40% | — | — | — |
| subtotal · personal income tax | $0 | $0 | +$0 |
II. Mandatory social security & health | |||
CCSS ~10.67%. CR10.7% · uncappedIE— | $10,670 | — | −$10,670 |
PRSI 4.2% Jan-Sep, 4.35% Oct → midpoint. USC is a separate income-tax-adjacent surcharge, not included here. CR—IE4.3% · uncapped | — | $4,275 | +$4,275 |
| subtotal · mandatory social security & health | $10,670 | $4,275 | −$6,395 |
| Total deductions | $10,670 | $4,275 | −$6,395 |
| Effective rate | 10.7% | 4.3% | -6.4 pp |
| Gross income | $100,000 | $100,000 | — |
| Net take-home | $89,330 | $95,725 | +$6,395 |
Table 1 · Statutory deductions, single-filer remote worker, FY2026 indicative. All amounts in USD. n/a where instrument does not apply. | |||
Both countries offer dedicated regimes for incoming professionals: Costa Rica's Costa Rica Digital Nomad Visa (0% flat) and Ireland's Irish Non-Dom Remittance (30% flat). On headline rate alone, Costa Rica's Costa Rica Digital Nomad Visa at 0% beats the alternative at 30% — a 30-point advantage before eligibility is considered.
For a digital nomad or remote worker on a $100k income, Costa Rica edges Ireland by 2 percentage points on the default schedule — a real but not overwhelming difference that other variables may offset. Costa Rica's territorial system means foreign-source income stays off the resident tax base entirely — a structural advantage for nomads paid by overseas clients that no rate comparison fully captures.
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