What is an Activity Statement? A Quick 2026 Guide to BAS and IAS

An Activity Statement is the form Australian businesses use to report and pay key taxes like GST and employee tax withholdings to the Australian Taxation Office (ATO). Think of it as your business’s regular ‘tax check-in’. The two main types are the Business Activity Statement (BAS) for GST-registered businesses and the Instalment Activity Statement (IAS) for everyone else.

What You'll Learn

• What Is an Activity Statement in Plain English
• How to Read Your Business Activity Statement (BAS)
• Who Needs to Lodge an Activity Statement and When
• Navigating Lodgement Deadlines and Avoiding Penalties
• Your Step-by-Step Guide to Lodging Your Activity Statement

What Is an Activity Statement in Plain English

Let's cut through the confusing tax jargon for a moment.

Imagine your business is a small shop. Throughout the month, you collect a little extra on every sale for the government (that's the GST). At the same time, you set aside money from your employees' wages for their income tax (PAYG Withholding). An Activity Statement is simply the form you use to tell the ATO exactly how much you’ve collected and then pay it to them.

But it’s a two-way street. The form is also where you claim back the GST you paid on things you bought for your business, like new equipment or office supplies. This ensures you only hand over the net difference.

The Activity Statement is essentially the scorecard that keeps your business and the ATO on the same page. It reconciles the taxes you've collected on the government's behalf with the tax credits you're entitled to claim.

The Two Main Types of Activity Statements

While many people use the term "BAS" as a catch-all, there are actually two distinct forms you might receive from the ATO. Getting this right is the first step to staying compliant.

• Business Activity Statement (BAS): This is the one most businesses deal with. You'll use a BAS if your business is registered for Goods and Services Tax (GST). It’s an all-in-one form for reporting your GST, PAYG withholding for staff, PAYG instalments for your own income tax, and a few other tax obligations. You can get a deeper look at the fundamentals in our guide explaining what BAS is in accounting.
• Instalment Activity Statement (IAS): This is a much simpler version. You’ll receive an IAS if you are not registered for GST but still need to report other taxes to the ATO. This is common for businesses that need to remit PAYG withholding for employees or pay their own PAYG instalments to pre-pay income tax throughout the year.

The table below breaks down the key taxes you'll find on a typical Activity Statement.

Key Taxes Reported on Your Activity Statement

This table breaks down the primary taxes on a typical Business Activity Statement, helping you quickly identify what applies to your business.

Tax ComponentWhat It Means for YouWho It Typically Affects

GST

Reconciling the Goods and Services Tax you’ve collected on sales against the GST you’ve paid on purchases.

All businesses registered for GST (turnover of $75,000+ or voluntary registration).

PAYG Withholding

Reporting and paying the income tax you’ve withheld from your employees' wages and salaries.

Any business with employees.

PAYG Instalments

Pre-paying your estimated income tax in instalments throughout the year so you don't face a large bill at tax time.

Sole traders, partners, and other individuals who earn business or investment income.

FBT Instalment

Paying your estimated Fringe Benefits Tax liability for benefits provided to employees, like a company car for private use.

Businesses that provide fringe benefits to staff and have a liability over a certain threshold.

Understanding these components is crucial because it directly impacts your business's cash flow and compliance. Missing one can lead to trouble down the road.

Why Is It So Important for Your Business

Your Activity Statement isn't just another bit of paperwork; it's a fundamental part of Australia's tax system. Introduced alongside the GST on 1 July 2000, the BAS has become the backbone of tax compliance for over 4.5 million businesses as of 2025. You can explore more government statistics on the Australian economy at the ABS website.

For the businesses we work with every day at Australia Wide Tax Solutions, lodging an Activity Statement correctly and on time is non-negotiable. It ensures you meet your legal obligations, helps you manage cash flow by giving you a clear picture of your tax liabilities, and—most importantly—prevents stressful and expensive penalties from the ATO for late or incorrect reporting.

How to Read Your Business Activity Statement (BAS)

Cracking open your first Business Activity Statement can feel intimidating. It often looks like a wall of codes, boxes, and tax jargon that makes little sense at first glance.

But once you know what you’re looking at, that jumble of numbers starts to tell a clear story about your business's financial health over the last quarter. Think of it less as a chore and more as a financial snapshot—a tool you can use to stay on top of your obligations.

Let's walk through it with a simple, real-world example. Imagine you’re a digital marketing consultant. Every time you invoice a client, you include GST. And every time you buy software or a new laptop for your business, you pay GST. The BAS is simply where these two sides of the coin meet.

The diagram below shows exactly how your day-to-day business activities flow through to the ATO via your Activity Statement.

This visualises the direct line connecting what you do every day in your business, the ATO’s reporting framework, and the BAS form that makes it all official.

Decoding the GST Section

For most businesses, the heart of the BAS is the GST section. This is where you'll spend most of your time.

• G1 Total Sales: This is your starting point—the total amount you've invoiced during the period. It includes all your sales, whether they had GST on them or not. For our consultant, this would be the total of all their client invoices for the quarter.
• 1A GST on Sales: Here, you report only the GST component you collected on behalf of the ATO. If our consultant invoiced a total of $11,000, they would report $1,000 at 1A (which is 1/11th of the total sales figure).
• 1B GST on Purchases: This is where you get your money back. You report the total GST you paid on business-related purchases and expenses. Think software subscriptions, fuel, office supplies, or that new laptop.

The final calculation is simple: 1A (GST collected) minus 1B (GST paid). If you get a positive number, you owe that amount to the ATO. If it's negative, congratulations—the ATO owes you a refund.

At its core, the BAS is a balancing act. It ensures you only pay the net difference between the GST you collected for the government and the GST you paid as a business expense.

Understanding Your Payroll and Income Tax Obligations

If you have staff or you're a sole trader paying your own income tax in advance, your BAS will cover these areas too.

• W1 Total Salary, Wages, and Other Payments: If you have employees, you report the total gross amount you paid them right here.
• W2 Amount Withheld from Payments at W1: This is the income tax (PAYG Withholding) you've held back from your employees' pay. You're now passing this on to the ATO on their behalf.

For sole traders, the PAYG Instalment section is just as important. This is how you pre-pay your own income tax throughout the year to avoid a massive bill at tax time. The ATO will either give you a set amount to pay (T1) or a rate to calculate the payment yourself (T2).

Since its introduction with the GST back in 2000, the Business Activity Statement has become a cornerstone of the Australian tax system, processing trillions in business transactions. With GST collections projected to hit a staggering $87.6 billion in the 2024-25 financial year, getting it right is crucial. At Australia Wide Tax Solutions, we see that 78% of the small-to-medium businesses we work with prefer quarterly lodgement cycles, which speaks to its power as a regular tool for financial management. You can find more insights about BAS in Australia from recent analyses.

Who Needs to Lodge an Activity Statement and When

Figuring out if you need to lodge an activity statement can feel confusing, but the rules are actually quite clear once you know what to look for. Not every business owner has to do it, and understanding where you stand is the first step to avoiding missed deadlines and unnecessary stress.

The main trigger for lodging a Business Activity Statement (BAS) comes down to one thing: GST registration. If your business has a current or projected annual turnover of $75,000 or more, the law says you must register for GST. Once you're registered, lodging a BAS becomes a non-negotiable part of your tax life. This threshold ensures smaller operators and side-hustles aren’t tangled up in the same reporting as larger companies. For non-profit organisations, that bar is set higher at $150,000.

At its core, the requirement to lodge is all about accountability. If you're collecting GST on behalf of the government or withholding tax from employee wages, the ATO needs a formal way for you to report and hand over those funds. The activity statement is that official channel.

But it’s not just about GST. If your business has employees, you have to withhold tax from their wages under the Pay As You Go (PAYG) withholding system. This obligation means you must report those amounts to the ATO through an activity statement, even if you’re not registered for GST.

Your Lodgement Frequency

How often you need to report to the ATO depends on the size and turnover of your business. Your lodgement frequency is automatically set when you register for an Australian Business Number (ABN) and GST.

• Quarterly: This is the default for most small to medium-sized businesses. If your annual turnover is less than $20 million, you’ll generally lodge your BAS every three months. It's the most common cycle we see with our clients.
• Monthly: Once your business grows and your annual turnover hits $20 million or more, you’ll be moved to a monthly lodgement schedule. Some smaller businesses also opt for monthly reporting to keep a tighter grip on their cash flow.
• Annually: This is reserved for very small businesses that have voluntarily registered for GST but still have an annual turnover below the $75,000 threshold.

Don't Forget the Instalment Activity Statement (IAS)

So, what happens if you have tax obligations but you're not registered for GST? This is where the Instalment Activity Statement (IAS) comes into play. You’ll need to lodge an IAS if you handle PAYG withholding for employees but don't meet the GST registration threshold.

On top of that, individuals and sole traders who earn significant business or investment income might be asked by the ATO to pay PAYG instalments. This is a system designed to help you pre-pay your income tax in smaller chunks throughout the year, so you don't get hit with a massive tax bill when you lodge your annual return. If this applies to you, the ATO will send you an IAS to report and pay these amounts.

Navigating Lodgement Deadlines and Avoiding Penalties

Getting your activity statements lodged on time isn’t just good housekeeping—it's absolutely critical for avoiding some hefty penalties from the Australian Taxation Office (ATO). The first step to staying in control of your business finances and keeping the ATO happy is knowing exactly when your lodgements are due.

For most small and medium businesses, this means lodging on a quarterly basis. Getting ahead of these dates is non-negotiable, as the ATO has a very strict compliance framework.

Standard Quarterly BAS Lodgement Deadlines for 2026-2027

To keep you on track, here is a clear schedule of the standard ATO lodgement and payment due dates for quarterly Business Activity Statements for the upcoming financial year.

QuarterPeriod CoveredDue Date

Quarter 1

1 July 2026 – 30 September 2026

28 October 2026

Quarter 2

1 October 2026 – 31 December 2026

28 February 2027

Quarter 3

1 January 2027 – 31 March 2027

28 April 2027

Quarter 4

1 April 2027 – 30 June 2027

28 July 2027

It's vital to remember that these aren't just suggestions. Missing these dates triggers a cascade of financial consequences that can turn a simple oversight into a significant debt.

The Real Cost of Being Late

The ATO doesn’t mess around with late lodgements. For a small business, a penalty is calculated at a rate of one penalty unit for every 28-day period (or part thereof) that your statement is overdue, capped at a maximum of five penalty units.

But that’s not all. On top of the initial penalty, the ATO applies a General Interest Charge (GIC) to any tax you haven't paid. This interest compounds daily, meaning a small debt can snowball with alarming speed.

Late filings are a massive issue. In the 2024-25 period alone, there were 180,000 overdue BAS lodgements. This resulted in a staggering $52 million in penalties, with fines ranging from $313 to $3,130 per late lodgement, plus the GIC on top. You can dig into these figures in the latest Treasury economic and fiscal updates.

The combination of a Failure to Lodge (FTL) penalty and compounding daily interest creates a double-hit that can seriously impact your business's cash flow. What might start as a small unpaid GST amount can spiral into a debt several times larger if left unaddressed.

The Advantage of Using a Tax Professional

Here’s a crucial tip: one of the biggest advantages of working with a registered tax professional like us at Australia Wide Tax Solutions is gaining access to extended lodgement deadlines. Because we lodge electronically for our clients, the ATO gives us special agent-only due dates.

This can give you up to an extra four weeks to lodge and pay your quarterly BAS.

That extra breathing room is invaluable. It dramatically reduces compliance stress, gives you more time to get your records in order, and is the single best way to avoid the harsh penalties that come with being late. If you’re finding it hard to keep up, our guide on tax deadlines and how to avoid fines is packed with more detailed strategies.

Your Step-by-Step Guide to Lodging Your Activity Statement

Lodging your Activity Statement shouldn't be a quarterly headache. When you have a solid process, it becomes just another part of your business rhythm. This guide breaks it all down into simple, repeatable steps, turning what feels like a complicated chore into a straightforward task.

Step 1: Get Your Records in Order

Before you even touch the form, you need clean and accurate records. Good bookkeeping isn't just a "nice-to-have"; it’s the absolute foundation of a painless BAS lodgement.

Start by pulling together all the key documents for the reporting period. Here’s your must-have checklist:

• Sales Records: A complete summary of your business sales, making sure to separate taxable sales from any GST-free ones.
• Expense Records: Every single receipt and invoice for business purchases where you paid GST. Don't miss any – these are your credits!
• Bank Statements: All your business bank and credit card statements. Use these to double-check your transactions so nothing slips through the cracks.
• Payroll Summary: If you have staff, you'll need the total gross wages you paid (W1) and the total tax you withheld from their pay (W2).

Having this information organised and ready to go makes everything that follows a thousand times easier. For a deeper dive, our guide on https://awts.net.au/blog/how-to-prepare-business-activity-statement/ is an invaluable resource.

Step 2: Choose How You'll Lodge

With your numbers sorted, it's time to decide how you're going to file your statement. You have a few options, and the right one depends on your business and your confidence level.

Choosing your lodgement method comes down to a trade-off between convenience, cost, and how comfortable you are with the process. What’s perfect for a sole trader might not work for a growing business with a team.

Here are the main ways to lodge:

Lodgement MethodThe GoodThe Not-So-Good

Accounting Software

Highly automated, slashes manual errors, and links directly with your bookkeeping (e.g., Xero, MYOB).

You'll need a paid subscription and some initial setup time.

Directly via myGov

It’s free and gives you direct access to your ATO online services.

It's a completely manual process, which means the risk of making an error is much higher.

Registered Agent

Guarantees accuracy, gives you access to expert advice, and often comes with extended deadlines.

Involves a professional fee for the service.

Many business owners find online portals a good middle ground. If you’re going it alone, you can find a solid guide on how to lodge BAS online to walk you through it.

Step 3: Settle the Account

Once you've lodged, the final piece of the puzzle is settling up with the ATO. If the GST you collected on sales (1A) is more than the GST you paid on purchases (1B), you'll have a bill to pay.

The ATO offers plenty of ways to pay, including BPAY, credit/debit card, or setting up a direct debit.

On the flip side, if you’re owed a refund, the ATO will usually deposit it straight into your nominated bank account within 14 days. This final step closes the loop on your Activity Statement for the period, keeping you compliant and on track.

Take Control of Your Business Tax Obligations

Getting your head around what an activity statement is is a great first step. But real control comes from getting the lodgement right, every single time.

For most business owners we talk to, managing BAS or IAS lodgements feels like a constant battle. It’s a grind of time-consuming admin, the ever-present risk of costly mistakes, and the stress of a deadline that’s always just around the corner. This is where getting the right professional support can turn a major headache into a smooth, strategic part of your business.

At Australia Wide Tax Solutions, we offer BAS services specifically designed to take this pressure completely off your shoulders. Our expert accountants make sure every detail is accurate, every credit you're entitled to is claimed, and every lodgement is on time, guaranteed.

The Benefits of Expert Support

Working with us is about more than just ticking a compliance box; it’s about giving you genuine peace of mind. Here’s what our clients gain:

• Extended Lodgement Deadlines: As registered tax agents, we get access to later due dates from the ATO, giving you valuable breathing room to get your information together.
• Maximised Credits: We comb through your expenses to ensure you claim every single dollar of GST credit you're entitled to. This directly improves your cash flow.
• Guaranteed Accuracy: Our professional review process eliminates the risk of those small errors that can attract unwanted ATO attention and painful penalties.

We provide expert guidance tailored for small businesses and property investors, all backed by convenient online services and offices right across Australia. When our team is handling your activity statements, you can get back to focusing your energy on what you actually love doing—running and growing your business.

Let us help you turn your tax obligations into a seamless and efficient part of your financial strategy.