GST Calculator
Add or remove GST and separate the tax from Australian or New Zealand amounts.
Calculate the GST component
Add GST to an Amount
Up to 500 lines replace the amount. Digits and cents only, no currency signs or separators.
To add Australian GST to an exclusive amount, multiply that amount by 10%. Add the resulting GST component to the exclusive amount.
For a hypothetical taxable professional fee of AUD $1,000.00 excluding GST, the component is AUD $100.00 and the inclusive total is AUD $1,100.00. These are the default results above.
Consider a separate AUD $80.00 expense. If it is taxable and quoted excluding GST, the component is AUD $8.00 and the inclusive total is AUD $88.00. Its tax treatment needs its own assessment. A fee’s treatment does not establish an expense’s treatment.
Enter only amounts to which the selected standard rate applies. Keep GST-free, input-taxed or otherwise exempt items separate from a taxable batch.
Amounts stay in this tab and clear on reload.
Remove GST From a Total
To reverse Australian GST, divide the inclusive total by 11 to find the GST component. Subtract that component from the total to find the exclusive amount.
An inclusive AUD $110.00 contains AUD $10.00 GST and AUD $100.00 before GST. Subtracting 10% of AUD $110.00 would remove AUD $11.00, leaving an incorrect exclusive amount of AUD $99.00.
For an inclusive AUD $100.00, GST rounds from 9.090909 dollars to AUD $9.09. The exclusive amount is AUD $90.91, so the displayed components add to AUD $100.00.
The calculator rounds GST to cents, with half a cent rounded away from zero, then derives the other component. The final total therefore equals the displayed exclusive amount plus the displayed GST. For three exclusive AUD $0.05 rows, row rounding produces AUD $0.03 GST and AUD $0.18 inclusive. Rounding the combined AUD $0.15 produces AUD $0.02 GST and AUD $0.17 inclusive. Choose the method that matches the records you are comparing.
| Row | Entered amount | GST-exclusive | GST component | GST-inclusive |
|---|---|---|---|---|
| 1 | AUD 1,000.00 | AUD 1,000.00 | AUD 100.00 | AUD 1,100.00 |
The table rounds each row. With combined rounding selected, headline figures use the combined entered amount.
Check the Australian Calculation
Australian GST uses the same national standard rate in NSW, WA, Victoria, Queensland and the other states and territories. Selecting a state does not change this arithmetic.
The Australian Taxation Office’s GST guidance explains the 10% standard rate and inclusive-price calculation. Calculating a component does not establish registration, tax liability or eligibility for a GST credit.
The Australian standard rate is 10% for the supported schedule beginning 1 July 2000. A taxable supply, a GST-free supply and an input-taxed supply have different tax consequences. Establish the transaction’s classification from its circumstances and supporting records before applying the calculator.
For GST-free and input-taxed sales, the sales price contains no GST component. Their credit rules differ. Entering 0% for arithmetic does not classify a supply or establish a credit entitlement.
For a sole trader, gross receipts and expenses need separate records. Suppose AUD $1,100.00 is taxable sales including 10% GST: AUD $100.00 is GST and AUD $1,000.00 is exclusive revenue.
The same split applies to hypothetical taxable ride-share receipts of AUD $1,100.00 before platform fees. Record a separate AUD $110.00 vehicle expense as its own transaction. If that expense includes 10% GST, its component is AUD $10.00. Eligibility for that credit depends on the actual purchase and its business use.
A vehicle sale receipt also needs its own tax treatment. Property sales under the margin scheme use a separate margin base. The GST margin scheme calculator keeps that calculation separate from ordinary full-price GST.
Carry the amounts into the legal expense tracking tool when preparing a matter schedule. Keep the fee and each expense on its own line with a consistent GST basis.
Standard-rate arithmetic only. The selected date does not determine taxability or registration.
Choose the GST Jurisdiction
Choose Australia for AUD amounts, New Zealand for NZD amounts or India for INR amounts. Australia and New Zealand select a standard-rate schedule. India requires your entered total GST rate for the selected effective date. Each mode labels the original currency. It does not convert currencies.
The Australian schedule begins at 10% on 1 July 2000. New Zealand’s historical standard rates are 10% from 1 October 1986, 12.5% from 1 July 1989 and 15% from 1 October 2010. Earlier dates are outside the supported schedules.
At 15%, an exclusive NZD $100.00 becomes NZD $115.00. For an inclusive amount, GST equals the total multiplied by 3/23. An inclusive NZD $2,000.00 contains NZD $260.87 GST and NZD $1,739.13 before GST.
Inland Revenue’s charging-GST guidance explains the 15% arithmetic. Its GST rate-change guidance covers the historical transition. The date selector applies the standard schedule only. Time-of-supply and transitional rules can affect which rate belongs on a particular transaction.
India mode supports entered rates from 0% to 100%, with up to two decimal places, for dates from 1 July 2017. This input range is an arithmetic limit, not a list of legally applicable rates. Obtain the transaction’s rate from the applicable Central Board of Indirect Taxes and Customs rate material and effective notification.
Use the total GST percentage: the combined central and state or territory components, or the integrated GST rate that applies. Cess stays separate. The date records your selected basis and does not look up an India rate or classify goods.
For a hypothetical entered rate of 18%, an exclusive INR 1,000.00 produces INR 180.00 GST and INR 1,180.00 inclusive. Reversing INR 1,180.00 uses 18/118 and returns the same components. In every mode, the entered basis means the price includes GST or excludes it, not the cash or accrual basis of a return.
Check a GST Worksheet Against the Result
In Excel, place the amount in A2 and the GST percentage as a percentage value in B2. For an exclusive input, GST is =ROUND(A2*B2,2) and the inclusive total is =A2+ROUND(A2*B2,2).
For an inclusive input, GST is =ROUND(A2*B2/(1+B2),2). The exclusive amount is =A2-ROUND(A2*B2/(1+B2),2). Enter 10% in B2 for standard Australian arithmetic. The round function rounds the component before the final addition or subtraction.
A hypothetical Australian worksheet has AUD $1,100.00 in taxable sales including GST and AUD $220.00 in eligible purchases including GST. Sales GST is AUD $100.00. Purchase credits are AUD $20.00. The arithmetic difference is AUD $80.00 payable, before other adjustments.
| Worksheet row | Inclusive amount | GST component |
|---|---|---|
| Taxable sales | AUD $1,100.00 | AUD $100.00 |
| Eligible purchases | AUD $220.00 | AUD $20.00 |
| GST less credits | AUD $80.00 |
This is a numeric business activity statement (BAS) or GST-return estimate. Reporting periods, eligibility and adjustments determine the lodged figures. Keep sales and credit rows separate, and reconcile their original records before lodging.
Use these public GST formulas when checking a figure recorded in Xero. This page calculates from the amount and basis you enter. Account-specific Xero reports and posted transactions remain in your accounting records. Moneysmart’s GST calculator also distinguishes taxable sales from purchases with claimable credits.