Most of the gap is opened by United States's Foreign Earned Income Exclusion regime, which displaces the standard schedule. Both countries are indicated in USD at the displayed FX.
United Kingdom taxes residents on worldwide income, while United States taxes its citizens on worldwide income regardless of residence — a structural difference that shapes how each country treats foreign-source income. United Kingdom's top marginal rate of 45% is 8 percentage points above United States's 37%, making the statutory gap one of the largest variables in this comparison. United States 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 feie · 0% flat | — |
| Social security 22.9% employee · capped | $7,650 |
| Total deductions | $7,650 |
| Gross income | $100,000 |
| Net take-home | $92,350 |
On a $100k single-resident employment profile under each country's default schedule, United States produces the lower effective burden at 24.4% versus 29.2% in United Kingdom — a 4.8 percentage-point gap that compounds to roughly $4,823 of additional take-home annually. The 8-point spread in top statutory rates is the primary driver; above their respective thresholds, each additional dollar is taxed at 45% in United Kingdom but only 37% in United States.
| Instrument | United Kingdom · USD | United States · USD | Δ (US − GB) |
|---|---|---|---|
I. Personal income tax | |||
Personal income tax GBprogressive · top 45%USfeie · 0% flat | $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 £50,300US7.6% · capped $184,500 | $5,094 | $7,650 | +$2,556 |
SECA: both employer + employee portions paid by SE. GB—US15.3% · capped $184,500 | — | — | — |
| subtotal · mandatory social security & health | $5,094 | $7,650 | +$2,556 |
| Total deductions | $29,185 | $7,650 | −$21,535 |
| Effective rate | 29.2% | 7.6% | -21.5 pp |
| Gross income | $100,000 | $100,000 | — |
| Net take-home | $70,815 | $92,350 | +$21,535 |
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 United States's Foreign Earned Income Exclusion (0% flat).
For a digital nomad or remote worker on a $100k income, United States edges United Kingdom by 4.8 percentage points on the default schedule — a real but not overwhelming difference that other variables may offset. United Kingdom taxes residents on worldwide income, so the headline effective rate applies to total global earnings — not just locally-sourced pay.
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