What Are PAYG Instalments?

PAYG instalments are regular pre-payments toward your expected income tax liability at the end of the financial year. The system is designed to help taxpayers manage their tax obligations gradually throughout the year rather than facing a large lump sum payment at tax time.

The Australian Taxation Office (ATO) automatically enrols individuals and businesses into the PAYG instalment system if they meet certain criteria. The most common trigger is having a tax debt of $1,000 or more on your most recent notice of assessment. Businesses registered for GST are also typically enrolled automatically.

Once enrolled, you must pay quarterly instalments based on your expected tax for the current year. At tax time, you claim a credit for the instalments you've already paid, reducing (or eliminating) any final tax bill. This system is particularly important for sole traders, freelancers, and investors whose tax isn't automatically withheld throughout the year.

Understanding how to use a quarterly tax calculator can help you budget accurately and avoid underpayment penalties. It's also possible to vary your instalments down if your income decreases, giving you flexibility during changing financial circumstances.

Who Needs to Pay Quarterly Tax Instalments?

The ATO enrols taxpayers into the PAYG instalment system based on several criteria. The primary threshold is having a tax debt exceeding $1,000 on your latest notice of assessment. Other triggers include earning business or investment income that isn't subject to withholding tax, or having a total tax liability that's significantly higher than any amounts already withheld from your salary.

Sole traders and freelancers are almost always enrolled because their income doesn't have tax withheld at source. Investors with substantial rental income, dividends, or capital gains may also be enrolled, even if they have a regular salaried job. The ATO will notify you in writing if you're required to join the system.

You are generally excluded from the PAYG instalment system if your notional tax (the tax on your latest assessed taxable income) is less than $500. Retirees and students earning below the tax-free threshold typically fall outside the system. If your circumstances change, you can request to be removed from the system by contacting the ATO.

How PAYG Instalments Work in FY 2025-26

The PAYG instalment system offers two calculation methods. The ATO calculates your instalment based on your most recent tax assessment adjusted by a reasonable estimate multiplier. Alternatively, you can vary your instalment amount to reflect your current year income if it's different from the ATO's estimate.

Under the ATO-calculated method, you receive an instalment notice each quarter telling you exactly how much to pay. The amount is based on the difference between your last tax assessment and the total instalments already made for the year, with adjustments for economic factors. This method is simple but may not reflect a significant change in your income.

The varied method gives you more control. You calculate your own instalment based on your actual income for the current year. This is useful if your income has dropped significantly (you can pay less) or increased significantly (you should pay more to avoid a large bill at year-end). To vary your instalment, you complete the instalment variation section on your quarterly activity statement.

Be cautious when varying your instalment downwards. If you reduce your instalments and your actual tax ends up being higher than expected, you may be charged a penalty known as the General Interest Charge (GIC). The ATO applies this penalty if your varied instalments are less than 85% of your actual tax liability for the year.

Quarterly PAYG Instalment Due Dates for FY 2025-26

PAYG instalments are due four times per financial year. The due dates align with the Business Activity Statement (BAS) lodgement schedule for quarterly reporters. It's crucial to mark these dates in your calendar to avoid late payment penalties.

If the due date falls on a weekend or public holiday, the payment is due on the next business day. You can set up direct debit through the ATO's online services to ensure payments are made automatically on time. Late payments attract the General Interest Charge, which compounds daily and can add significant cost to your tax obligations.

Some taxpayers may qualify for monthly or annual reporting rather than quarterly. Monthly reporting is usually reserved for larger businesses with higher GST turnover, while annual reporting is available to individuals whose notional tax is below $8,000. Check your ATO notice to confirm your reporting frequency.

How to Calculate Your Quarterly PAYG Instalment

If you use the ATO-calculated method, the ATO does the maths for you. Your quarterly instalment notice shows the amount to pay based on your previous year's tax assessment adjusted for estimated growth. You simply pay the stated amount by the due date.

If you choose to vary your instalment, you'll need to estimate your current year's taxable income. Start with your actual income earned so far this financial year, add any expected income for the remaining quarters, and subtract allowable deductions. Apply the current tax rates (including Medicare levy) to calculate your expected total tax, then divide by the number of remaining instalment periods.

Here is a practical example. Suppose your notional tax from last year was $12,000, making your ATO-calculated quarterly instalment $3,000. This year, however, your freelance income has dropped by 30% due to a slow economy. You estimate your total tax for the year will be $8,400. You can vary your quarterly instalment to $2,100 ($8,400 ÷ 4), saving $900 per quarter in payments. Remember that if your final tax ends up being higher than 100 ÷ 85 times your varied total, you may face penalties.

PAYG Instalments and Your Overall Tax Picture

Your quarterly PAYG instalments directly reduce the tax you owe when you lodge your annual return. At tax time, the total instalments you made throughout the year are credited against your assessed tax liability. If you paid more in instalments than you owe, you receive a refund. If you paid less, you owe the difference plus any applicable interest.

For sole traders and freelancers, understanding your quarterly tax obligations is essential for cash flow management. Use our Take-Home Pay Calculator to understand your effective tax rate, and plan your quarterly payments accordingly. Our Income Tax Calculator can help you estimate your total annual tax, which forms the basis for your instalment calculations.

If you also have a regular salary with tax withheld by your employer, your PAYG instalments on other income (freelance, investment) only need to cover the extra tax on that income. Your salary withholding already covers the tax on your employment income. This overlap can be confusing, so consider using tax planning software or consulting a registered tax agent to ensure you're not overpaying.

The PAYG instalment system interacts with other tax obligations too. If you have a HECS-HELP debt, your quarterly instalments should account for compulsory HECS repayments based on your total income. Similarly, the Medicare Levy is included in your notional tax and factored into your instalment calculations.

What Happens If You Don't Pay Quarterly Instalments?

Failing to pay your PAYG instalments on time triggers the General Interest Charge (GIC), which is calculated daily on the outstanding amount. The GIC rate is set quarterly and is based on the 90-day Bank Accepted Bill rate plus a premium. As of FY 2025-26, this typically results in an annualised rate of approximately 11% to 12%.

Persistent non-payment can lead to stronger ATO enforcement actions, including garnishee notices directed at your bank accounts or debtors, director penalty notices for company directors, and potential legal proceedings. The ATO also reports unpaid tax debts to credit reporting agencies for debts over $100,000, which can impact your credit score.

If you're struggling to meet your PAYG instalment obligations, contact the ATO early to discuss payment arrangements. The ATO generally offers payment plans for taxpayers experiencing genuine financial difficulty. You can also request a deferral of your instalment due date in certain circumstances.

Frequently Asked Questions

Can I opt out of the PAYG instalment system?

You can request to be removed if your circumstances have changed and your notional tax is now below $500. Contact the ATO through your myGov account or by phone to discuss your situation. You cannot opt out simply because you prefer not to make quarterly payments — the system is mandatory for taxpayers meeting the thresholds.

Do I need to lodge a BAS if I only pay PAYG instalments?

Yes, if you're registered for PAYG instalments you will receive an activity statement each quarter. This may be a BAS (Business Activity Statement) if you're also registered for GST, or an IAS (Instalment Activity Statement) if you're not. You must lodge it even if you have nothing to report or are paying the ATO-calculated amount.

How do I vary my PAYG instalment amount?

Complete the variation section on your quarterly activity statement. You'll need to estimate your current year's taxable income and calculate the appropriate instalment. The ATO provides a worksheet on their website to help with this calculation. Lodge your varied amount online through ATO online services or via your registered tax agent.

Can I pay my PAYG instalments monthly instead of quarterly?

Some taxpayers can choose monthly or annual reporting instead of quarterly. Monthly reporting is typically available to businesses with higher GST turnover. Annual reporting is available to individuals with notional tax below $8,000. Check with the ATO or your tax agent to see if you're eligible for an alternative reporting frequency.

What's the difference between PAYG withholding and PAYG instalments?

PAYG withholding is what your employer does — deducting tax from your salary and sending it to the ATO on your behalf. PAYG instalments are what you pay directly to the ATO if you have income from sources other than employment (freelance work, investments, business income). Both systems serve the same purpose: pre-paying your expected tax throughout the year.

What if my income is seasonal and varies widely by quarter?

You can vary your instalment each quarter to match your actual income. For example, if you earn most of your freelance income in the December quarter, you can pay larger instalments in Q2 and smaller amounts in other quarters. The key is ensuring your total yearly instalments reach at least 85% of your actual tax to avoid GIC penalties.

Disclaimer: This article provides general information only and does not constitute tax advice. PAYG instalment rules, thresholds, and rates are subject to change. Always verify current information with the ATO (ato.gov.au) and consult a registered tax agent for advice specific to your circumstances.