Your First BAS: A Plain-English Walkthrough

The BAS has a reputation problem. New freelancers hear about it like it's the final boss of Australian paperwork. It's not. Once you've done it once, it takes about 15 minutes per quarter and becomes routine. This guide walks through every step of your first Business Activity Statement without the jargon.

What is a BAS?

A Business Activity Statement (BAS) is a form you submit to the Australian Taxation Office (ATO) to report and pay several tax obligations, most commonly your Goods and Services Tax (GST). If you're registered for GST, you use the BAS to tell the ATO how much GST you collected from clients, how much GST you paid on business expenses, and the difference you either owe or are owed.

Think of it as a regular check-in with the ATO. For most freelancers, this happens every quarter. You add up your income, subtract your expenses, report the GST component of each, and either pay the balance or receive a refund.

The BAS can also cover other obligations like Pay As You Go (PAYG) instalments (prepayments toward your annual income tax) and PAYG withholding (if you have employees). But for a typical sole-trader freelancer, GST is the main event. If you're operating as a Pty Ltd instead of a sole trader, the BAS process has some extra moving parts.

Do you need to lodge a BAS?

Not every freelancer needs to lodge a BAS. The key question is whether you're registered for GST.

You must register for GST and lodge a BAS if:

• Your GST turnover (gross business income, not profit) is $75,000 or more per financial year, or
• You reasonably expect it will reach $75,000 in the current financial year.

If your turnover is below $75,000, GST registration is optional. Many freelancers earning under the threshold don't register, which means no BAS to worry about.

There's a catch, though. If the ATO has set you up with PAYG instalments (which they sometimes do after your first tax return shows business income), you may still need to lodge a BAS to report those instalments, even without GST registration. You'll know because the ATO will send you a BAS with PAYG instalment labels pre-filled.

The short version: If you're registered for GST, or the ATO has asked you to pay PAYG instalments, you need to lodge a BAS.

GST registration: when you must and when you might want to

GST registration is mandatory once your annual turnover hits $75,000. But some freelancers choose to register voluntarily even when earning less. The decision has real trade-offs either way.

Reasons to register voluntarily

• You can claim GST credits on expenses. If you buy a $1,100 laptop (GST-inclusive), you can claim back the $100 GST component. For freelancers with significant business expenses (equipment, software subscriptions, coworking space), these credits add up.
• You look more established. Some clients, particularly larger businesses, prefer working with GST-registered suppliers. It signals you're running a legitimate operation.
• You expect to cross $75,000 soon. If you're on track to hit the threshold, registering early avoids the scramble of mid-year registration.

Reasons to stay unregistered

• Less admin. No BAS means no quarterly reporting obligation. Simple.
• Pricing advantage. If your clients are consumers (not businesses), adding 10% GST to your invoices makes you more expensive. Business clients can claim the GST back, so they don't mind. Consumers can't.
• Your expenses are low. If you're a writer or consultant with minimal business costs, the GST credits you'd claim are negligible. The admin isn't worth it.

To register for GST, you can do it online through the ATO Business Portal or through your myGov account linked to the ATO. Registration takes effect from the date you choose (it can be backdated by up to four years in some cases, but for a new registration you'll usually pick a current or future date).

Once registered, you'll be assigned a reporting period. Most freelancers lodge quarterly, which means four BAS lodgements per year.

Field-by-field walkthrough of a basic BAS

This is where eyes start to glaze over. Don't let it.

If you've been keeping reasonable records, filling in a quarterly BAS takes about 15 minutes. The key fields on a standard quarterly BAS for a GST-registered sole trader:

G1: Total sales

This is your total business income for the quarter, including GST. Every dollar a client paid you goes here. If you invoiced $11,000 (which includes $1,000 of GST), you write $11,000.

Include all sales, even GST-free ones (like exported services). The form sorts out the GST component later.

G2: Export sales

If you did work for overseas clients, that income is GST-free. Enter the total of any export sales here. Most freelancers working exclusively with Australian clients will put $0.

G3: Other GST-free sales

Any other income that is GST-free. For most freelancers, this is $0. Some specific services (like certain health or education services) are GST-free, but standard freelance work is not.

G10: Capital purchases

If you bought any capital assets (equipment, computers, vehicles) for more than a small amount, enter the GST-inclusive total here. A $2,200 camera or a $3,300 laptop would go in this field.

G11: Non-capital purchases

This is your regular business expenses for the quarter, GST-inclusive. Software subscriptions, office and home office costs, phone bills, coworking fees, professional development, travel for work. It all goes here.

1A: GST on sales

This is the total GST you collected from your clients during the quarter. If all your sales were taxable and totalled $33,000 (GST-inclusive), the GST component is $3,000 (one-eleventh of the total). So you would enter $3,000.

The formula is: GST-inclusive amount / 11 = GST component.

1B: GST on purchases

This is the total GST you paid on your business expenses (both capital and non-capital). Using the same one-eleventh formula, add up the GST on all your deductible purchases.

For example, if your total business purchases were $4,400 (GST-inclusive), the GST component is $400.

8A: PAYG instalment amount (if applicable)

If the ATO has set you up with PAYG instalments, this field will show a pre-calculated amount or an instalment rate. This is an advance payment toward your annual income tax. You can vary it if your income has changed significantly, but most people pay what's shown.

9: Your payment or refund

This is where it all comes together. The ATO calculates it as:

GST on sales (1A) minus GST on purchases (1B) plus any PAYG instalment (8A) = amount you owe (or are owed)

Using our examples above: $3,000 - $400 = $2,600. You would owe $2,600 for the quarter.

If your GST on purchases exceeds your GST on sales (a big spending quarter), you get a refund.

Lodging and paying

You can lodge your BAS through:

• The ATO Business Portal (business.ato.gov.au)
• myGov (linked to your ATO account)
• Your registered tax agent or BAS agent
• Standard Business Reporting (SBR) enabled software like Xero or MYOB

Quarterly BAS due dates are:

If you lodge through a registered tax or BAS agent, you may get an automatic extension of up to four weeks on some quarters. Worth asking about.

Common mistakes to avoid

The same mistakes come up every BAS season.

Mixing up GST-inclusive and GST-exclusive amounts

The BAS asks for GST-inclusive figures in the G fields and GST-only amounts in labels 1A and 1B. The most common error is putting GST-exclusive income in G1. If a client paid you $5,500, you enter $5,500 in G1 (not $5,000). The GST component ($500) goes in 1A.

Claiming GST on things that don't have GST

Some purchases are GST-free: bank fees, government charges, insurance (some types), wages if you pay a subcontractor who isn't registered for GST. If there's no GST on the purchase, don't claim a credit for it. Check the invoice. If there's no ABN or the invoice says "no GST", you can't claim the GST credit.

Forgetting to lodge

A late BAS attracts a Failure to Lodge (FTL) penalty. Currently, the base penalty for a small entity is $313 for each 28-day period the BAS is overdue, up to a maximum of five periods ($1,565). The ATO can also charge a General Interest Charge (GIC) on any unpaid amounts. Set a calendar reminder a week before each due date.

Claiming private expenses

If you use something for both business and personal purposes (like a phone or internet), you can only claim the business portion. A common approach is to estimate a reasonable percentage (say 60% business use) and only claim GST credits on that portion.

Not keeping proper tax invoices

To claim a GST credit on purchases over $82.50 (GST-inclusive), you need a valid tax invoice. No invoice, no claim. This catches a lot of freelancers who pay for things but don't save the receipts.

Record-keeping tips

Good records make BAS time easy. Bad records make it painful.

Use accounting software

Even the simplest option will save you hours. Xero, MYOB, or even a well-structured spreadsheet will track your income and expenses, calculate GST automatically, and in many cases lodge your BAS directly. The subscription cost ($25-60/month for basic plans) pays for itself in time saved and mistakes avoided.

Keep every tax invoice

For every business purchase, save the tax invoice. A photo on your phone is fine. The ATO accepts digital records. For a full list of what you can claim, see our complete deductions guide. What matters is that the invoice contains:

• The supplier's ABN
• The date
• A description of the goods or services
• The GST amount (or a statement that the price includes GST)
• The total amount

For purchases under $82.50 (GST-inclusive), you don't need a full tax invoice, but it's good practice to keep a record anyway.

Separate your bank accounts

Open a dedicated business bank account and use it exclusively for business transactions. This makes it dramatically easier to reconcile your records each quarter. When every transaction in your business account is a business transaction, there's no guessing about what's personal and what isn't.

Set aside GST as you earn it

A simple habit that prevents BAS-time pain: every time you receive a payment, transfer one-eleventh of it to a separate savings account. That's the GST component. When your BAS is due, the money is already there. No scrambling, no surprise.

For example, if a client pays you $5,500, transfer $500 to your GST savings account immediately. When your quarterly BAS comes due, you have the cash ready.

Reconcile monthly, not quarterly

Don't leave all your bookkeeping to the week before BAS is due. Spend 30 minutes at the end of each month matching your bank transactions to your records. Three quick monthly check-ins are far less stressful than one panicked quarterly session.

Frequently asked questions

What happens if I lodge my BAS late?

$313 per 28-day period it's overdue, up to five periods ($1,565 max). Plus the General Interest Charge on any unpaid amounts. If you know you'll be late, call the ATO before the due date. They're generally willing to work with you if you reach out first.

Can I lodge my BAS monthly instead of quarterly?

Yes. Some freelancers prefer monthly because it keeps the amounts smaller and the bookkeeping more current. Change your reporting period through the ATO Business Portal. For most sole traders, quarterly is simpler.

What if I made a mistake on a previous BAS?

You can correct errors on your next BAS if the net error is $10,000 or less. Include the correction in the relevant label on your current BAS. For errors over $10,000, you need to request a formal amendment through the ATO. If you made an honest mistake, the ATO is generally reasonable. They'd rather you correct it than leave it wrong.

Do I need to charge GST on work for overseas clients?

Generally, no. Services provided to overseas clients are considered GST-free exports under Australian tax law, provided the work is performed for a non-resident who is outside Australia when the services are performed. You still report this income on your BAS (in G1 and G2), but no GST is charged. This is one area where the rules can get nuanced, so if you do a lot of international work, it's worth getting specific advice.

What is the difference between BAS and a tax return?

Your BAS is a periodic (usually quarterly) report to the ATO, primarily for GST purposes. Your annual income tax return is a separate lodgement where you report your total income and expenses for the financial year, and the ATO calculates your income tax. They're two different obligations. If you pay PAYG instalments through your BAS, those amounts are credited toward your annual income tax bill.

Do I need an accountant to do my BAS?

No. Many freelancers lodge their own, especially with accounting software doing the calculations. A BAS agent charges $100-$300 per quarter for basic lodgement, which makes sense if you have international clients, mixed-use assets, or multiple income streams. For a straightforward freelance operation with domestic clients, you can handle it yourself.

I am not registered for GST but received a BAS from the ATO. What do I do?

This usually means the ATO has set you up for PAYG instalments based on your last tax return. You still need to lodge it, but only the PAYG instalment section, not the GST labels. Check the pre-filled amount, pay it by the due date, and it gets credited toward your annual income tax.

If the instalment amount looks wrong (your income has dropped significantly, for example), you can vary it on the form. Our PAYG instalments guide covers how.