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Pay As You Go Instalments or PAYG Instalments are implemented by the Australian Taxation Office (ATO) to help businesses and individuals meet their income tax obligations throughout the financial year.
It is particularly relevant for businesses that expect to have a tax liability at the end of the financial year. PAYG Instalments require businesses to make regular payments toward their expected tax liability, which are credited against their annual income tax assessment.
There are two primary methods to calculate and pay PAYG Instalments:
- Instalment Amount: Under this method, the ATO provides an estimate of your expected tax liability based on your previous year’s income and tax return. Businesses then make regular, pre-determined payments throughout the financial year, generally on a quarterly basis. The ATO’s estimate is designed to align with your expected income, ensuring your payments are proportional to your earnings.
- Instalment Rate: This method allows businesses to calculate their own PAYG Instalments based on their actual income and business activity. You are required to estimate your expected income for the current financial year and apply the applicable instalment rate, which can vary based on your business type and circumstances. Your payments will then fluctuate with your actual income, ensuring a more precise contribution to your annual tax liability.
Choosing the most suitable method for your business depends on various factors:
- Income Stability: If income is relatively stable and consistent from year to year, the Instalment Amount method may be more convenient, as it simplifies payment obligations.
- Income Variability: For businesses with fluctuating incomes, the Instalment Rate method offers flexibility by allowing adjustment to payments in accordance with actual earnings.
- Accuracy: If a business can make reasonably accurate income projections, the Instalment Rate method may help avoid overpaying or underpaying tax.
Key Dates for PAYG and BAS Lodgements
To avoid penalties, it’s crucial to be aware of the due dates for Business Activity Statement (BAS) lodgements. Generally, BAS is due on the following dates:
- Quarter 1 (July–September): 28 October
- Quarter 2 (October–December): 28 February
- Quarter 3 (January–March): 28 April
- Quarter 4 (April–June): 28 July
For monthly BAS reporters, the due date is generally the 21st of the following month. Always check the ATO’s website or your BAS notification for specific deadlines.
Recent Changes to PAYG Instalments
The ATO periodically updates PAYG Instalment policies to reflect economic conditions or legislative changes. Recent updates include:
- Annual Indexation of Instalment Rates: PAYG Instalment rates are now adjusted annually to account for inflation and economic factors, impacting businesses using the Instalment Rate method.
- Electronic BAS Lodgement Encouragement: The ATO has emphasised online BAS lodgements, simplifying processes for businesses and providing instant feedback.
- Flexibility in Payment Arrangements: Businesses facing cash flow issues due to unforeseen circumstances can negotiate payment plans with the ATO.
Staying informed about such changes ensures compliance and helps businesses optimise their tax strategies.

Common PAYG-Related Concerns
Overpaying or Underpaying
If you underpay your PAYG Instalments, you may face a larger tax bill at the end of the financial year. The ATO will calculate your total tax liability based on your annual income, deducting the instalments you have already paid. Any shortfall will need to be settled during your tax return lodgement, and penalties or interest charges may apply if your underpayment is significant or deemed negligent.
On the other hand, overpaying your PAYG Instalments can result in a credit when your tax return is finalised. While this ensures you won’t owe additional taxes, it could impact your cash flow unnecessarily. Overpayments are typically refunded or applied as a credit towards your next tax liability, depending on your preference.
Switching Methods if Circumstances Change
You can change your PAYG Instalment method if your financial circumstances shift significantly. For instance, if your income becomes less predictable or you foresee fluctuations, switching from the Instalment Amount method to the Instalment Rate method may provide better flexibility. Conversely, businesses with stable income may find the Instalment Amount method easier to manage.
To switch methods, you need to update your preferences through your business activity statement (BAS) or directly via the ATO online services. It is essential to ensure the switch aligns with your current and projected financial situation to avoid complications. Consulting with a professional, like Equal Books, can help you make an informed decision and handle the administrative aspects of switching.
Impact on Cash Flow and Budgeting
PAYG Instalments can significantly affect a business’s cash flow and budgeting. Regular payments mean businesses must allocate sufficient funds throughout the year, reducing the risk of financial strain when the annual tax bill is due. However, if instalments are overestimated, it may limit the availability of funds for other operational needs.
To minimise cash flow disruptions, it’s important to monitor your financial position closely and ensure instalments are aligned with your actual income. Businesses with fluctuating income should pay extra attention to balancing instalments to avoid overcommitting funds that could be better utilised elsewhere.
Tips for Managing PAYG Instalments
Reviewing income projections regularly
Frequent reviews of your income projections are crucial for ensuring your PAYG Instalments align with your financial performance. This practice allows you to make timely adjustments and avoid overpayment or underpayment, especially if your business experiences seasonal income variations.
Staying up to date with ATO communications
The ATO provides regular updates on PAYG Instalments, including deadlines, payment methods, and any changes in policies or rates. Staying informed through their communications ensures you remain compliant and avoid penalties or missed payments.
Keeping accurate records for better estimations
Accurate and up-to-date financial records are the foundation for reliable income projections. Tracking income, expenses, and cash flow in detail enables you to calculate PAYG Instalments more precisely. Using bookkeeping software and working with professionals can simplify this process and improve accuracy.
![]() From the ATO Case study 1: Kelly the DJ Kelly is a DJ, working at festivals from November to January. She chooses to use the instalment rate method as it suits her seasonal business income. Using the rate method means she needs to work out her business income each period. It helps her manage cash flow because the amounts she pays will vary in line with her income. When Kelly receives her BAS or instalment notice, she calculates the instalment based on her income for that period, multiplied by the rate provided. Case Study 2: David the plumber David is a plumber with a regular monthly business income, so he chooses the instalment amount method. He won’t need to work out his business income each period to use this method. David pays the instalment shown on his BAS. The amount is calculated from the information in his last lodged tax return. The BAS Agent’s Role A BAS Agent is permitted to make the changes on the BAS – to have the BAS calculate the correct PAYGI based on the information – however, it is not the permitted role of a BAS agent (nor any contractor who is not a Tax Agent) to advise on what a new PAYGI rate should be. A BAS Agent needs to receive instructions from the correctly authorised person within a business (or the business’s Tax Agent) regarding the new PAYGI rate or outcome. The BAS Agent can then amend the rate on the BAS. The Tax Agent’s Role The revision of the PAYGI rate or amounts is the realm of the Tax Agent as it requires the interpretation and application of income tax laws to the business circumstances. If you have any questions about this – why not book in a free chat with us? https://shorturl.at/qtCS8 |
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Managing PAYG Instalments doesn’t have to be overwhelming. With professional guidance and personalised support from Equal Books, you can confidently meet your tax obligations and optimise your cash flow.
Contact us today to schedule your free consultation and take the first step towards stress-free financial management.