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.
Both United Kingdom and Ireland operate on a worldwide-income basis, though each country's bracket structure and available regimes produce materially different outcomes. United Kingdom's top marginal rate of 45% is 5 percentage points above Ireland's 40%, making the statutory gap one of the largest variables in this comparison. Ireland uses a fixed 183-day threshold for residency; United Kingdom relies on a multi-factor test with no single day-count trigger.
| Personal income tax progressive · top 45% | $24,091 |
| Social security 8.0% employee · capped | $5,094 |
| Total deductions | $29,185 |
| Gross income | $100,000 |
| Net take-home | $70,815 |
| 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, United Kingdom produces the lower effective burden at 29.2% versus 30.4% in Ireland — a 1.2 percentage-point gap that compounds to roughly $1,177 of additional take-home annually. Ireland's uncapped social-security charge lifts its effective burden above what the bracket schedule alone would imply; United Kingdom's contributions are capped, so high earners there pay a lower marginal social rate on income above the cap. Social-security contributions also differ: United Kingdom charges 8.0% versus 4.3% in Ireland, adding a second layer to the effective-rate spread that doesn't show in the income-tax brackets alone. The narrow effective-rate gap means the decision between the two countries is unlikely to rest on the default schedule alone — regime availability, cost of living, and social-security treatment will be the tiebreakers.
| Instrument | United Kingdom · USD | Ireland · USD | Δ (IE − GB) |
|---|---|---|---|
I. Personal income tax | |||
Personal income tax GBprogressive · top 45%IEprogressive · top 40% | $24,091 | — | −$24,091 |
| subtotal · personal income tax | $24,091 | $0 | −$24,091 |
II. Mandatory social security & health | |||
NI Class 1: 8% on £242-£967/wk; 2% above (cap modeled at primary upper earnings limit). GB8.0% · capped £50,300IE— | $5,094 | — | −$5,094 |
PRSI 4.2% Jan-Sep, 4.35% Oct → midpoint. USC is a separate income-tax-adjacent surcharge, not included here. GB—IE4.3% · uncapped | — | $4,275 | +$4,275 |
| subtotal · mandatory social security & health | $5,094 | $4,275 | −$819 |
| Total deductions | $29,185 | $4,275 | −$24,910 |
| Effective rate | 29.2% | 4.3% | -24.9 pp |
| Gross income | $100,000 | $100,000 | — |
| Net take-home | $70,815 | $95,725 | +$24,910 |
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: United Kingdom's FIG (Foreign Income and Gains) and Ireland's Irish Non-Dom Remittance (30% flat).
For a digital nomad or remote worker on a $100k income, United Kingdom edges Ireland by 1.2 percentage points on the default schedule — a real but not overwhelming difference that other variables may offset.
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