PAYG Instalments in Australia: What They Are and How They Work

Receiving your first PAYG instalment notice from the ATO is one of the most common sources of confusion for new business owners and investors. The letter arrives, asks for a significant amount of money, and it’s not immediately obvious why your tax return isn’t due until October. This guide explains what PAYG instalments are, why the ATO sends them, how the amount is calculated, and what options you have if the figure seems wrong for your current circumstances.

What Are PAYG Instalments?

PAYG stands for Pay As You Go. PAYG instalments are a system the ATO uses to collect income tax from businesses and investors throughout the year, rather than waiting until the annual tax return is lodged. Think of it as the ATO asking you to pre-pay portions of your estimated annual tax bill in quarterly (or annual) chunks.

The logic is straightforward: employees have tax withheld from every payslip (via PAYG withholding). But business owners, investors, and self-employed people have no employer withholding from their income. Without PAYG instalments, they would accumulate a large tax liability over the full year and pay it all at once creating a cash flow shock and increasing the risk of non-payment. PAYG instalments spread the obligation across the year.

All PAYG instalments you pay during the year are fully credited against your income tax liability when your annual return is assessed. If your instalments total more than your actual tax, you receive a refund. If they total less, you pay the balance.

PAYG Instalments vs PAYG Withholding: What’s the Difference?

These two systems share the ‘PAYG’ name and both appear on your Business Activity Statement, but they are completely separate mechanisms:

Why Is the ATO Asking for PAYG Instalments?

You are enrolled in PAYG instalments when both of the following apply

The ATO identifies you for PAYG instalments automatically when processing your previous year’s income tax return. If your assessed tax (after offsets and credits) exceeds $1,000 and your business or investment income exceeds $4,000, the ATO issues a PAYG instalment letter and includes the obligation on your subsequent BAS lodgments.

You do not need to apply for PAYG instalments; the ATO enrols you based on your lodged return data. The first instalment notice may arrive several months after your tax return is assessed, covering the current or next financial year.

How Is the PAYG Instalment Amount Calculated?

The ATO offers two methods for calculating your PAYG instalment amount, and you can choose either on each BAS:

Method 1: Instalment Amount (T7) The ATO’s Calculation

The ATO calculates an instalment amount (shown as T7 on your BAS) based on your most recently lodged income tax return. The calculation divides your estimated annual tax by the number of instalments due in the year. This is the default; if you simply pay the amount shown at T7, you are paying the ATO’s estimate without any calculation on your part.

Limitation: The T7 amount is based on last year’s income. If your income has changed significantly this year, the T7 amount will not reflect your actual liability.

Method 2: Instalment Rate (T4) Your Own Calculation

You can instead calculate your own instalment using the instalment rate method (T4). The ATO provides an instalment rate (shown on your BAS) based on your income history. You apply that rate to your actual instalment income for the quarter (business income + investment income) to calculate how much you should pay.

Formula: Quarterly instalment income (T1) x Instalment rate (T4) = Instalment amount to pay (T9)

The instalment rate method is more accurate when your income fluctuates quarter to quarter. It also allows you to effectively vary your instalment automatically; a lower income in a quarter naturally produces a lower instalment without needing a formal variation.

Why Is My PAYG Instalment So High?

This is the most common PAYG instalment complaint. The short answer: because it is calculated on last year’s income, not this year’s. Three specific reasons the amount can feel disproportionately large:

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  Your income was higher last year: if you had an unusually good year (a large contract, a capital gain, a one-off event), the T7 amount for this year reflects that higher income. If this year is more typical, the instalment will overshoot your actual liability
• 
  Your first year of instalments: the ATO’s first instalment notice often covers multiple quarters if you were enrolled partway through the year. The notice may ask for two quarters at once (for example, Q1 and Q2 of the new financial year) to bring you current
• 
  You are on the T7 method, and your income has dropped: the ATO’s fixed amount does not adjust for a bad quarter. Switch to the T4 (instalment rate) method or lodge a formal variation to reduce it

What to do: vary your instalment down (see the next section). You are not required to pay the T7 amount if you expect your annual tax liability to be lower than the ATO estimates. Varying is a normal, expected part of the system. The ATO specifically provides the mechanism because income fluctuates.

How to Vary Your PAYG Instalment

Varying your PAYG instalment means paying a different amount from the ATO’s T7 figure on a particular BAS. You can vary up (if you expect a higher income) or vary down (if your income has fallen). Variation is reported using T4 (instalment rate method) on the relevant BAS.

PAYG Instalment Due Dates

Why Do I No Longer Need to Pay PAYG Instalments?

The ATO may remove you from the PAYG instalment system, or you can exit voluntarily, in the following situations:

• 
  Your tax liability dropped below $500: if your most recently assessed tax return shows a liability below $500, the ATO will typically remove you from the system automatically
• 
  Your business or investment income dropped below $4,000: below the entry threshold, the ATO will exit you from the system on your next assessment
• 
  You ceased business or stopped earning investment income: you can vary your instalment to nil and lodge a nil variation on each subsequent BAS. The ATO will typically remove you from the system after two or three nil annual assessments
• 
  You were a company that paid a large franked dividend: dividend imputation credits from franked dividends can offset a company’s PAYG instalment obligations
• 
  You lodged a return showing no tax due: large deductions, losses carried forward, or tax offsets can reduce assessed tax to below the threshold

If you receive a BAS with a PAYG instalment amount but believe you should no longer be in the system, vary to nil on that BAS and contact your tax agent. Do not simply ignore the instalment amount on the BAS; lodging a nil variation is the correct process, not leaving the T7 field blank.

PAYG Instalments and Your BAS: How They Fit Together

If your business is registered for GST, your PAYG instalments are reported on the same Business Activity Statement as your GST. The BAS combines several obligations: GST collected (1A), GST credits (1B), PAYG withholding from employee wages (W1/W2), and PAYG instalments (T1/T4/T7). The net amount after all these components is what you pay or receive as a refund.

A common scenario: a business’s Q1 BAS might show GST payable of $3,200, PAYG withholding of $1,500, and a PAYG instalment of $2,800 total payment of $7,500. Each component is calculated separately; the PAYG instalment portion can be varied independently without affecting the GST or withholding amounts.

For businesses not registered for GST, PAYG instalments are reported on a quarterly PAYG instalment notice issued by the ATO rather than on a BAS.

How The Kalculators Can Help

PAYG instalments set too high are a significant cash flow drain on small businesses, and the mechanism for varying them is not well understood by most business owners. Our small business tax return service and BAS lodgment service cover PAYG instalment management as part of the quarterly BAS cycle:

• 
  Reviewing whether the ATO’s T7 amount is appropriate for your current income level
• 
  Lodging variations where your income has changed materially from the prior year
• 
  Switching between the T7 (amount) and T4 (rate) methods, where the rate method produces more accurate results
• 
  Advising on voluntary upward variations where a capital gain or large income event is expected
• 
  Exiting clients from the PAYG instalment system where they no longer meet the thresholds

If you have received a PAYG instalment notice and are unsure whether the amount is correct for your circumstances, contact us before the payment due date.