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Start by confirming what has actually changed. The Australian Taxation Office (ATO) said in its overview published 31 October 2024 that GST is 10% on most goods and services and that the headline rate had not changed since GST began in July 2000, although the goods and services covered by GST have changed. The material available here does not establish a later enacted rate change or transition rules for a future one. A change to GST coverage, a supplier’s price rise and a statutory rate change are different events, and each can affect your forecast differently.
For a GST-registered Australian business, the practical response is to update assumptions for taxable sales, customer prices, supplier costs, eligible input tax credits and payment timing; check whether your accounting basis could make GST payable before cash arrives; and reconcile your forecast against each actual business activity statement (BAS). Do not change invoices or prices based on a hypothetical rate change: confirm the law, effective date and rules for transactions that cross the change first.
First identify what has changed
Before editing a price list or accounting-system tax code, identify the event and the transactions it affects. The ATO’s overview, published 31 October 2024, says the GST rate is 10% and had not changed since the tax began in July 2000, while noting that the range of goods and services subject to GST has changed. That is a dated official statement, not a transition rule for a later change. Confirm any newer announcement and the applicable legislation before treating a change as enacted.
- Rate change: a law changes the GST rate. You need the amending law’s effective date and rules for supplies, payments, invoices, deposits, credit adjustments and contracts that span that date.
- Coverage or classification change: a supply or acquisition may move between taxable, GST-free or input-taxed treatment, or another classification may apply. The headline rate need not change for the amount of GST charged or creditable to change.
- Price change only: a customer or supplier changes a commercial price without a change in GST law. Recheck whether the quoted price is GST-inclusive or exclusive and update the cash forecast, but do not treat a price rise as a rate change.
Record the official source, effective date, affected transaction types and any transition treatment. If those details are not established, keep the proposed change as a clearly labelled planning scenario rather than changing live tax settings.
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Map the change to sales, costs and cash dates
A GST change can affect three different parts of cash flow: what customers pay, how much of sales is GST payable, and what GST on purchases may be creditable. The date a tax amount is attributed for reporting may also differ from the date money enters or leaves your bank account.
Build a transaction map
For each material sales and purchasing category, record the current treatment and the assumption that would apply if the confirmed change takes effect. Use your actual invoices, contracts and accounting records rather than treating every sale or expense as taxable.
| Record for each category | Why it matters |
|---|---|
| Supply or purchase type and current GST treatment | Not every sale is taxable, and not every GST-inclusive business expense gives rise to an input tax credit. |
| Current quoted or contracted amount, and whether it is GST-inclusive or GST-exclusive | The price term affects whether your business absorbs a change or changes the customer’s total price. Contract interpretation and consumer price obligations require advice suited to your circumstances. |
| Invoice date, expected receipt or payment date, and expected amount | These dates help identify a gap between tax attribution and cash movement. |
| Expected GST amount and supporting records | This lets you estimate likely liabilities and credits, then verify that credit claims are eligible and adequately supported. |
| Effective date and any confirmed transition treatment | Transactions near a change may require rules beyond simply applying a new rate to every invoice on or after one date. |
Forecast more than one cash case
Make a before-and-after forecast over the periods affected by the change. A practical low, base and high case can vary customer payment delays, supplier prepayments and the timing of eligible credits. These are planning scenarios, not ATO-prescribed forecasts. Include the expected invoice date and the date cash is likely to move; a forecast that records only the invoice date can hide a short-term funding gap.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteKeep the forecast’s assumptions visible in the spreadsheet or accounting report: affected categories, price terms, accounting basis, transaction dates and any unconfirmed transition assumptions. When the rule or a customer’s payment expectation changes, update the relevant inputs rather than overwriting the actuals.
Separate forecast amounts from amounts already invoiced, paid, received or reported. For each scenario, check both the expected net GST position and the cash position on key dates: when customers are expected to pay, when suppliers must be paid and when the BAS payment is due. This makes it easier to see whether an apparently healthy sales margin still leaves a short-term cash gap.
When modelling an uncertain change, state the assumptions beside the figures—for example, which categories are assumed to be affected and which transaction dates are being tested. Do not turn the scenario into a live tax code or customer invoice until the effective date and treatment are confirmed. Once actual transactions occur, replace estimates with the underlying records and compare the result with the forecast.
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Decide how customer prices will be handled
A change in GST does not by itself answer whether your business should change its advertised, quoted or contracted price. First check the price terms: is the amount GST-inclusive or GST-exclusive, and does the contract say how a tax change is handled? Then determine whether your business will absorb a change, revise the GST-exclusive amount, or alter the total amount the customer pays. Those choices can affect margin and cash receipts differently.
For current law, section 9-75 of the A New Tax System (Goods and Services Tax) Act 1999 calculates the value of a taxable supply as the price multiplied by 10/11. Its example gives GST of $2,000 on a $20,000 GST-exclusive taxable supply, for a GST-inclusive total of $22,000. That is the current formula; it is not a general formula for a hypothetical future rate. Do not apply 10/11 to non-taxable supplies or use it to calculate a changed rate.
Before changing a customer-facing price or an invoice, verify the applicable law and the actual contract. The sources cited here do not establish consumer price-display obligations, contract interpretation or transition rules for a future change. Ask a registered tax professional or a lawyer about your specific arrangements where those rules matter.
For planning, compare the two sides of the decision rather than looking only at the new tax amount. If the business holds the total customer price constant, test how the change could affect the amount retained before GST and your margin. If the total price changes, test whether customers are likely to pay the revised amount on the expected schedule. These are cash-flow scenarios, not a conclusion about what a contract permits or what price you must display.
Estimate input tax credits from eligible purchases
An input tax credit can reduce the GST payable on your BAS, but it is not an automatic refund of GST shown on every business expense. Check whether the acquisition is creditable, how it is used, the applicable GST treatment and the records required for the claim. The ATO’s credit guidance describes a general four-year time limit for claiming GST credits; confirm the relevant rule and dates for your particular circumstances.
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- Group recurring purchases by type and review their current GST treatment. Identify which costs would actually be affected by the confirmed change.
- For each affected category, estimate the GST amount and expected supplier invoice and payment dates. Keep the estimate separate from amounts that have already been verified.
- Check credit eligibility and retain tax invoices or other evidence required for the claim. The ATO ruling notes exceptions to the tax-invoice requirement, so the requirement is not identical for every claim.
- Record the accounting period in which the credit can be attributed under your accounting basis, then reconcile the estimate to the actual purchase records and BAS.
Do not assume that a supplier’s GST-inclusive price increase creates an equal credit for your business. The acquisition must meet the relevant credit rules, and the treatment can differ by purchase type.
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Keep a simple evidence status with each forecast purchase: estimated, invoice received, eligibility checked, and claimed or carried forward for review. This helps prevent a forecast credit from being mistaken for an amount ready to claim. The ATO says GST credits are claimed through a BAS or annual GST return; if a potentially eligible credit was omitted, check whether it can be claimed later and whether the time limit still allows it.
Choose accounting and reporting assumptions that fit your cash timing
GST accounting basis affects when sales GST and purchase credits are attributed. Under cash accounting, they generally follow amounts actually received or paid. Under non-cash accounting, they are generally attributed at the earlier of invoice or payment or receipt. Check your eligibility and current requirements before changing methods; the ATO business-accounting guidance cited here was last updated 4 April 2019, so confirm current details rather than relying on that page alone for a method change.
| Basis or cycle | General timing effect | Cash-flow consideration |
|---|---|---|
| Cash accounting | GST and credits generally follow amounts received or paid. | Attribution may track cash movement more closely. Eligibility and suitability depend on the business and current rules. |
| Non-cash accounting | GST is generally attributed at the earlier of invoice or payment/receipt. | A sale can create GST payable before the customer pays. A purchase credit may also be attributed before you pay the supplier. |
| Monthly reporting | The ATO gives the 21st of the following month as a general monthly BAS lodgment and payment date, subject to its next-business-day rule. | This is not a universal deadline. Use the due date shown for your own activity statement and arrangement. |
| Quarterly or annual reporting | Reporting options depend on the business’s circumstances; the monthly date above does not set these deadlines. | Compare the reporting and payment cycle with the timing of receipts and supplier outflows, and check your actual statement or ATO instructions. |
Neither accounting basis is automatically better for every business. Compare eligibility, invoice and payment timing, cash volatility, forecasting reliability and the administrative work required. A different basis changes attribution timing; it does not make an otherwise ineligible credit claimable.
For a non-cash business, review invoices dated near the end of a reporting period alongside actual receipts. A customer may not yet have paid even though the sale is attributed for GST purposes. Conversely, a purchase credit may be attributed before the supplier is paid. For a cash-basis business, track receipts and payments as well as invoices so the forecast reflects the relevant cash events. In either case, use the basis that applies to the business rather than switching assumptions to make one period’s cash position look better.
Reporting frequency is a separate planning question from accounting basis. Monthly, quarterly or annual reporting may be available depending on circumstances, but the ATO’s general monthly due date should not be carried across to another cycle. The actual activity statement and any arrangement determine the date to plan around.
Use accounting software and a separate cash control
The ATO’s business accounting guidance recommends using accounting software to manage invoices and produce GST liability and credit reports. It also suggests putting collected GST in a separate bank account. That guidance was last updated 4 April 2019, so check current product capabilities and ATO requirements before relying on a particular workflow.
- Review tax settings: list the tax codes used for the affected sales and purchases. Change a live code only when the applicable treatment and start date are confirmed.
- Keep a forecast separate from posted transactions: model alternative prices, costs and timing without entering unconfirmed amounts as real invoices or bills.
- Run the relevant GST report: use the accounting system’s liability and credit reports as estimates, then verify them against source transactions and evidence.
- Move cash deliberately: transfer an amount representing collected GST to a separate bank account or maintain an equivalent clearly identified reserve. Do not assume this reserve equals the final BAS payment: credits and adjustments change the net amount.
- Reconcile actuals: compare the report with sales, purchases, adjustments and the BAS for the period. Investigate differences before treating the forecast balance as cash available to spend.
A spreadsheet can supplement this process if it records the same dates, GST treatment, expected amounts and evidence status. It should not replace the underlying invoices and transaction records used to substantiate a BAS.
Revisit the reserve when a material customer receipt is delayed, a supplier changes its price or payment terms, or a tax treatment is confirmed. The point is not to reserve an arbitrary percentage of all bank deposits: estimate the net GST position from taxable sales, eligible credits and adjustments, then keep enough available for the BAS payment and ordinary supplier outflows. The ATO’s separate-account suggestion is a visibility and discipline tool, not a claim that all collected GST will be payable.
Distinguish a later adjustment from an original error
If a later event changes the GST payable or the credit amount for a transaction, it may require an adjustment. If an amount was wrong when originally reported, that is an error. The distinction matters: do not automatically treat every later change as a correction to the original BAS, or assume a correction is an adjustment. Follow the ATO’s applicable treatment for the facts and period.
If you discover an eligible credit was missed, the ATO says it may generally be claimed on a later BAS within the applicable time limit. Check the four-year general limit against the relevant claim and records rather than treating it as a substitute for confirming eligibility.
When reviewing a changed transaction, establish what happened and when. A later event that changes the original GST or credit amount is different from finding that the amount was incorrect when first reported. Keep the supporting records and identify the affected period so the treatment can be checked before changing a BAS or making a later claim.
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Before lodging, replace forecast figures with actual transactions and reconcile the period’s sales GST, eligible purchase credits and any adjustments. Set aside the amount needed for payment after this reconciliation, not just the gross GST collected from customers. The ATO’s general monthly due date is the 21st of the following month, with a next-business-day rule where applicable; it does not apply as a universal deadline to every reporting arrangement. Follow the due date on your activity statement.
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- Check that sales and purchases are assigned to the correct period under your accounting basis.
- Match credit claims to eligible acquisitions and required supporting evidence.
- Review later events that may require an adjustment, separately from amounts that were originally reported incorrectly.
- Compare actual receipt and payment dates with forecast dates to identify timing gaps before the next BAS period.
- Keep enough cash available for the reconciled payment and the next expected supplier outflows.
After each BAS, compare the forecast with the actual result: which receipts arrived later than expected, which supplier payments moved, and whether credits were available in the period you anticipated. Carry the revised assumptions into the next forecast. This gives you a practical early warning if the combination of price changes, payment timing and GST attribution is putting pressure on working cash.
Frequently Asked Questions
Do I need to change my prices if GST changes?
Not automatically. First confirm that a legal change has taken effect, identify which supplies it affects and check whether each quoted or contracted amount is GST-inclusive or GST-exclusive. Then model whether the business absorbs a change or revises the total price. Contract interpretation and consumer price-display obligations need advice suited to your circumstances; do not treat a hypothetical rate change as a reason to alter live prices.
Will I owe GST before my customer pays?
Possibly. Under non-cash accounting, GST is generally attributed at the earlier of invoice or payment/receipt, so an invoice can bring GST payable into a reporting period before the customer pays. Under cash accounting, GST generally follows amounts received. Check the accounting basis that applies to your business and plan around actual BAS dates.
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Does every GST-inclusive business purchase give me an input tax credit?
No. The acquisition must be creditable and have the applicable GST treatment, and you must meet the evidence rules for the claim. Keep tax invoices or other required evidence; the ATO ruling notes exceptions to the tax-invoice requirement. GST credits are claimed through a BAS or annual GST return.
How long do I have to claim a missed GST credit?
The ATO describes four years as the general time limit for claiming GST credits. A missed eligible credit may generally be claimed on a later BAS within the applicable limit, but check the relevant dates and eligibility for your circumstances.
Should I change from non-cash to cash accounting to protect cash flow?
Not as an automatic response. Cash accounting generally aligns GST attribution with amounts received and paid, while non-cash accounting generally uses the earlier of invoice or payment/receipt. Compare eligibility, cash volatility, forecasting reliability and administration, and verify current requirements before changing methods. A different basis changes timing; it does not change whether a purchase is eligible for a credit.
When is my BAS due?
The ATO gives the 21st of the following month as a general monthly BAS lodgment and payment date, subject to the applicable next-business-day rule. That is not a universal deadline for every reporting cycle or arrangement. Use the due date shown on your own activity statement.
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The Bottom Line
Confirm the actual GST change and its effective date before altering prices, invoices or tax settings. Forecast customer receipts, supplier outflows, eligible credits and attribution dates together; keep collected GST visible in a reserve, then reconcile actual sales, purchases and adjustments to each BAS. The 10% headline rate and current 10/11 formula are current-law facts, not instructions for a hypothetical future change.
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