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    Australia vs USA Tax Comparison for the Self-Employed

    Side-by-side comparison of federal income tax, self-employment tax vs Medicare levy, state income tax, capital gains regimes, company tax and dividends, sales tax vs GST, retirement savings, and business structures for self-employed operators in both countries.

    Australia is generally lighter and simpler than the USA at self-employed income levels of USD $100,000 to $400,000 equivalent, primarily because there is no US-style 15.3% self-employment tax and no state income tax. The US loads approximately 15.3% payroll-type tax on net self-employment earnings (12.4% Social Security up to USD $176,100 plus 2.9% Medicare, uncapped), while Australia adds only a 2% Medicare levy. At higher incomes, Australia's steep 37%/45% marginal rates can push effective rates above the US, but CGT concessions, franking credits, and super contributions often restore the Australian advantage for business owners who plan their exits and distributions.

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    Federal income tax brackets

    The US uses a seven-bracket structure for 2025 (single filer), ranging from 10% on the first USD $11,925 to 37% above USD $533,400. Australia uses a four-bracket structure for 2025-26, ranging from 16% on income above $18,200 to 45% above $190,000, plus a flat 2% Medicare levy. Australia provides a tax-free threshold of $18,200. The US provides a standard deduction of USD $15,000 (2025, single) that functions similarly but is not a zero-rate bracket. At equivalent income levels, Australia's brackets are wider and steeper in the mid-range, but the top rate differential (45% vs 37%) is partially offset by the absence of state income tax.

    Self-employment tax vs Medicare levy

    This is the largest structural difference between the two systems. The US imposes a 15.3% self-employment tax on net earnings: 12.4% for Social Security (capped at USD $176,100 for 2025) plus 2.9% for Medicare (uncapped), plus an additional 0.9% Medicare surtax on earned income above USD $200,000. Australia imposes only a 2% Medicare levy on taxable income (with a low-income threshold of approximately $27,000 to $28,000) and a Medicare Levy Surcharge of 1% to 1.5% for higher-income individuals without appropriate private hospital cover. There is no Australian equivalent of the Social Security component. This 13-percentage-point gap in payroll-type charges is the primary reason Australia is lighter for self-employed operators at most income levels.

    State income tax: US vs Australia

    Most US states impose income tax at rates ranging from approximately 1% to 13.3% on top of federal tax, with separate state filing requirements. A handful of states (Texas, Florida, Washington, Nevada, and others) levy no state income tax. Australia does not levy any state or territory income tax. This structural difference means an Australian sole trader files one return to one revenue authority. A US self-employed person in a high-tax state like California files federal and state returns and faces a combined top marginal rate exceeding 50% (37% federal + 13.3% state), before accounting for SE tax.

    Capital gains tax comparison

    The US taxes long-term capital gains (assets held over one year) at preferential rates: 0%, 15%, or 20% depending on income, plus a possible 3.8% Net Investment Income Tax (NIIT) for high earners. Short-term gains are taxed at ordinary income rates. QSBS under IRC section 1202 can exclude up to 100% of gain on qualifying C-corporation stock held for five or more years, subject to caps. Australia provides a 50% CGT discount for assets held longer than 12 months, with the remaining 50% taxed at marginal rates. Small business CGT concessions under Division 152 of the ITAA 1997 are broader than QSBS and can combine with the general discount to drive effective rates to zero.

    Company tax and dividends

    The US levies a flat 21% federal corporate tax rate on C-corporations, with additional state corporate taxes in most states. Dividends face double taxation: corporation tax at the company level, then qualified dividend rates (0%, 15%, or 20% plus possible 3.8% NIIT) at the shareholder level. Australia levies 25% on base rate entities or 30% on other companies, with the franking credit system crediting shareholders for company tax already paid. Grossed-up dividends are included in personal income and the franking credit offsets personal tax. If the shareholder's marginal rate is below the company rate, excess franking credits can be refunded. This integration is structurally more favourable for small company owners distributing profits than the US double-taxation model.

    Sales tax vs GST

    The US uses a fragmented state and local retail sales tax system with rates ranging from 0% to over 10% combined, no federal sales tax, and generally no input tax credits for businesses. Australia charges a federal 10% GST with full input tax credits for GST on business purchases. The Australian system is significantly simpler: one rate, one jurisdiction, credits for business inputs. The US system requires tracking nexus obligations across multiple states and cities, with varying rates, exemptions, and filing frequencies.

    Retirement savings: 401(k)/IRA vs superannuation

    US self-employed can access Solo 401(k), SEP-IRA, SIMPLE IRA, and traditional or Roth IRA accounts. Contributions to traditional accounts reduce taxable income at marginal rates; Roth contributions are post-tax with tax-free withdrawals. Australia taxes concessional super contributions at 15% flat inside the fund, with a concessional cap of $30,000 for 2025-26. Self-employed Australians have no SG obligation to themselves but can claim a tax deduction for eligible personal concessional contributions. Division 293 imposes an additional 15% where income plus contributions exceed $250,000. For self-employed operators on marginal rates of 30% or above, Australian super provides strong rate arbitrage (15% vs 30%+). US traditional IRA/401(k) provides relief at marginal rate, which is more valuable at the top bands, but contribution limits and income phase-outs constrain the benefit.

    Approximate effective tax burden at key income levels

    The following illustrative comparison assumes a single self-employed individual with no special deductions. US figures include 5% representative state income tax. Exchange rate assumes AUD/USD 1.5:1. At USD $100,000, both systems produce effective rates around 31% to 34%, but the composition differs: the US layers high SE tax with modest income tax, while Australia charges no SE tax but higher marginal income tax. At USD $200,000, Australia moves into 37%/45% bands and the effective rate rises to 34% to 37%, while the US sits at 31% to 35%. At USD $400,000, Australia's 45% top rate drives the effective rate to 40% to 43%, while the US caps Social Security and slows marginal growth to 33% to 37%. With planning (companies, trusts, super in Australia; S-corps and retirement accounts in the US), effective rates in both countries can be reduced significantly.

    Statute references

    • Income Tax Assessment Act 1997 (Australian income tax rates, Division 152 CGT concessions)
    • A New Tax System (Goods and Services Tax) Act 1999
    • Superannuation Guarantee (Administration) Act 1992
    • Internal Revenue Code, sections 1-7 (US federal income tax)
    • Internal Revenue Code, section 1401-1403 (self-employment tax)
    • Internal Revenue Code, section 1202 (QSBS exclusion)
    • Internal Revenue Code, sections 401(k), 408 (retirement accounts)
    • Australia-United States Double Taxation Convention

    Frequently asked questions

    Why is Australia generally cheaper for the self-employed despite higher income tax rates?+
    The single biggest driver is the absence of self-employment tax. The US imposes 15.3% on net self-employment earnings on top of federal and state income tax. Australia imposes only a 2% Medicare levy on top of income tax, and there is no state income tax. At USD $100,000 equivalent, the total effective rates are comparable because Australia's higher marginal rates offset the US SE tax. Above that level, the composition shifts but the totals remain competitive. With company, trust, and super planning, Australia often comes out ahead for owner-operators.
    How does the US S-corp strategy compare to Australian company and trust planning?+
    US self-employed operators often form S-corporations to split income between salary (subject to payroll tax) and distributions (not subject to SE tax), creating a meaningful tax arbitrage. In Australia, the equivalent strategies involve operating through Pty Ltd companies with franked dividend distributions, discretionary trusts for income streaming to family members, and maximising concessional super contributions at 15% inside the fund. Australia's franking system is more integrated than US dividend taxation, and trust-based income splitting is more commonly available.
    Is QSBS better than Australian small business CGT concessions for a business exit?+
    QSBS (Qualified Small Business Stock under IRC section 1202) can exclude up to 100% of gain on qualifying C-corporation stock held for five or more years, subject to a cap of the greater of USD $10 million or ten times basis per issuer. It is extremely powerful but narrow: it applies only to C-corporations meeting strict active business and gross asset tests. Australian small business CGT concessions under Division 152 are broader in scope, apply across qualifying structures (not just companies), and can stack: the 50% general CGT discount plus the 50% active asset reduction plus the $500,000 retirement exemption can combine to drive the effective rate to zero on qualifying disposals.
    Does Australia have state income tax?+
    No. Australia does not levy state or territory income tax. Individuals and businesses pay only federal income tax plus the federal-level 2% Medicare levy. This is a major structural simplification compared to the US, where most states impose income tax at rates ranging from approximately 1% to 13.3%, with separate filing requirements, deductions, and credits. A handful of US states (Texas, Florida, Washington among others) have no state income tax.

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