Australian GST is 10%. Add GST to an exclusive price or extract 1/11 from an inclusive price. Mixed invoices separate taxable, GST-free and input-taxed amounts. Taxable imports use customs value, duty, international transport and insurance, and WET where applicable. The real-property margin scheme uses the eligible margin for tax and the full sale price for the total.

Formula

Standard GST = exclusive value × 10% = inclusive value ÷ 11. Eligible margin scheme GST = margin ÷ 11; net sale proceeds before other costs = full sale price − GST.

Examples

Standard sale

AUD 100 before GST gives GST 10 and total 110.

Eligible margin scheme

Sale price AUD 500,000 and eligible margin 100,000 give GST 9,090.91. The total transaction is 500,000, not 100,000.

A PRACTICAL GUIDE

When to use this calculator

The Australian GST calculator can add tax to a net amount or extract it from a final price. Its supported margin-scheme mode answers a different question from an ordinary sale, so eligibility and the meaning of the entered margin are essential before comparing the results.

Information to prepare

Confirm the price mode and whether an ordinary or eligible margin-scheme calculation applies. Prepare the relevant sale and acquisition information for the selected method. The GST component of a margin is not calculated by applying the standard percentage to the entire sale price.

How to interpret the result

The tax base is the value to which the selected transaction treatment applies. An inclusive total already contains tax and requires a reverse calculation to recover its net value. These amounts are not interchangeable. Tax charged on an invoice, tax withheld by a customer and eligible input-tax credit describe different obligations. Subtracting two amounts in a cash breakdown does not establish that they have the same legal treatment. Check what each output represents before using it in an invoice or budget.

A practical comparison

When reviewing proceeds, distinguish GST from other selling costs and annual income tax. A net amount after GST is not automatically profit or money available after every expense. Use the income-tax calculator for annual earnings and keep its deductions separate from the invoice calculation.

Check your calculation step by step

  1. Match the figures to the selected period and use AUD for monetary inputs. If you start with a document in another currency or covering several periods, resolve that difference before entering a combined amount.
  2. Calculate the documented case first. Then change one input at a time to compare scenarios. Keep the original values available so a change in the result can be traced to a particular assumption rather than several simultaneous edits.
  3. Read the component breakdown alongside the formula and examples below. If an official document differs, check the date, base, rounding and omitted concepts before changing a rate or treating the difference as an error.

Continue with a related calculation

These tools cover other questions in Australia. Choose the one that matches the amount you want to check:

If you are comparing countries

Open the relevant jurisdiction when comparing a move, an offer or a transaction abroad. Each tool uses its own currency, period and scope; its result should not be substituted into the current calculation.

Explore all calculators for Australia

Frequently asked questions

Is the margin the full selling price?

No. Enter the full GST-inclusive selling price in Amount and the eligible margin in Margin. The tax is 1/11 of that margin; the gross transaction remains the full selling price.

Does selecting the margin scheme establish eligibility?

No. Eligibility, the required agreement and the applicable margin method must be established. This calculation estimates the GST liability and does not calculate settlement withholding.

Are all imports taxable?

The import option is for a taxable importation. Determine customs relief, low-value import rules and exclusions separately before using that option.

CHECK THE REFERENCES

Official sources