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.
Australia 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. Australia'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.
| Personal income tax progressive · top 45% | $24,722 |
| Social security 2.0% employee · uncapped | $2,000 |
| Total deductions | $26,722 |
| Gross income | $100,000 |
| Net take-home | $73,278 |
| 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 26.7% in Australia — a 2.4 percentage-point gap that compounds to roughly $2,360 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 Australia but only 37% in United States. Social-security contributions also differ: United States charges 7.6% versus 2.0% in Australia, adding a second layer to the effective-rate spread that doesn't show in the income-tax brackets alone.
| Instrument | Australia · USD | United States · USD | Δ (US − AU) |
|---|---|---|---|
I. Personal income tax | |||
Personal income tax AUprogressive · top 45%USfeie · 0% flat | $24,722 | — | −$24,722 |
| subtotal · personal income tax | $24,722 | $0 | −$24,722 |
II. Mandatory social security & health | |||
Medicare Levy +2% of taxable income. Superannuation is employer-paid. AU2.0% · uncappedUS— | $2,000 | — | −$2,000 |
FICA 6.2% SS (cap $184,500) + 1.45% Medicare (uncapped). Additional 0.9% Medicare above $200k not modeled. AU—US7.6% · capped $184,500 | — | $7,650 | +$7,650 |
SECA: both employer + employee portions paid by SE. AU—US15.3% · capped $184,500 | — | — | — |
| subtotal · mandatory social security & health | $2,000 | $7,650 | +$5,650 |
| Total deductions | $26,722 | $7,650 | −$19,072 |
| Effective rate | 26.7% | 7.6% | -19.1 pp |
| Gross income | $100,000 | $100,000 | — |
| Net take-home | $73,278 | $92,350 | +$19,072 |
Table 1 · Statutory deductions, single-filer remote worker, FY2026 indicative. All amounts in USD. n/a where instrument does not apply. | |||
United States offers the Foreign Earned Income Exclusion (flat 0% on qualifying income) for qualifying incoming residents; Australia has no equivalent ICP-targeted regime currently modelled — new residents there enter the standard Australia schedule immediately. For movers who don't qualify for United States's Foreign Earned Income Exclusion, both countries revert to their default progressive schedules, where Australia's lower top rate still gives it a structural edge.
For a digital nomad or remote worker on a $100k income, United States edges Australia by 2.4 percentage points on the default schedule — a real but not overwhelming difference that other variables may offset. Australia taxes residents on worldwide income, so the headline effective rate applies to total global earnings — not just locally-sourced pay.
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