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Australian GST Calculator

Add or remove Australia's 10% Goods & Services Tax.

Inputs

Net amount

Mode

GST

$10.00

Total A$110.00

Rate

10%

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Forward: GST = net × 10%. Reverse: net = gross ÷ 1.10; GST = gross − net.

Are these amounts an exact tax bill?

No. They use verified 2026 IRS/SSA figures but ignore credits, phase-outs and AMT. Use tax software or a CPA to file.

Marginal vs effective rate?

Marginal is the rate on your next dollar. Effective is total tax ÷ taxable income — always lower because earlier brackets fill first.

Standard or itemized?

Take whichever is larger. 2026 standard deduction: Single $16,100 · MFJ $32,200 · HoH $24,150 · MFS $16,100.

How is state tax handled?

Eight states impose no income tax. The rest are approximated at their top rate — see your state's brackets for a precise figure.