Engaging contractors and small suppliers is part of running a nimble business. But if a supplier sends you an invoice with no ABN, the ATO’s “no ABN withholding” rules can suddenly apply - and the stakes are high.
In short: if a supplier doesn’t quote an Australian Business Number (ABN) and no exception applies, you may need to withhold 47% from the payment and report it to the ATO. Miss it, and you could be on the hook for the unpaid amount, penalties and interest.
This guide explains when no ABN withholding applies, the no ABN withholding rate, how to calculate it (including GST scenarios), the key exceptions, and the practical steps you should build into your onboarding and accounts payable process to stay compliant.
What Is “No ABN Withholding” And Why Does It Matter?
No ABN withholding is part of the PAYG (Pay As You Go) withholding rules. It requires you to withhold 47% from payments you make to suppliers for goods or services if they don’t quote their ABN on their invoice (or otherwise provide it), unless a specific exception applies.
This rule exists to ensure people carrying on an enterprise are appropriately registered and meeting their tax obligations. For you, the payer, it’s a compliance obligation: if you pay the full amount without withholding when you should have, the ATO can pursue the shortfall and penalties from your business.
As a preventative step, make it standard practice to request an ABN before you approve new suppliers. It’s also sensible to understand the advantages and disadvantages of having an ABN so you can communicate expectations clearly to contractors and vendors.
When Do You Need To Withhold Because An ABN Was Not Quoted?
You need to withhold if all of the following are true:
- You are paying a supplier for goods or services (a “supply”).
- The supplier has not quoted their ABN on the invoice or provided it in another way you can record.
- No exception applies (see below).
“Quoted” usually means the ABN appears on the invoice or written agreement. If the ABN is provided separately (for example, in an email) and you keep that record, that’s generally fine - the key is that you hold evidence of the ABN tied to that supplier and supply.
Before you process any payment to a new supplier, build in a quick ABN check to confirm it’s valid and active. You can do this in minutes using the ABN Lookup service; here’s a quick guide to checking if an ABN is active.
Common Exceptions (When You Don’t Need To Withhold)
The ATO recognises situations where withholding is not required even if an ABN isn’t quoted. Key exceptions include where:
- The supplier provides a Statement by a Supplier declaring the supply is made in a private or domestic capacity, or is a hobby (not an enterprise).
- The supplier is not carrying on an enterprise in Australia (for example, certain overseas suppliers, depending on the facts).
- The payment is for supplies of $75 or less (excluding GST) per invoice.
- The supplier is under 18 and the payment is below the weekly threshold (rare for business-to-business supplies).
For the hobby/private use exception, get the ATO’s “Statement by a Supplier” form completed and keep it with the invoice. Also remember that what looks like a hobby can quickly cross into “carrying on a business” - the ATO focuses on intent, repetition and commerciality. If you’re unsure, this explainer on what defines a business activity in Australia is a useful starting point.
Also keep in mind: some people ask if they can “just pay cash.” Paying in cash does not remove your PAYG obligations and can create other risks - see the guidance on cash-in-hand arrangements for context.
What Is The No ABN Withholding Rate - And How Do You Calculate It?
The no ABN withholding rate is 47% of the payment.
That rate applies to the payment amount you’re otherwise due to make. If the invoice includes GST, you still calculate 47% on the full payment amount. You then pay the supplier the net amount (payment minus withholding) and remit the amount withheld to the ATO.
Worked Examples
- Invoice with no GST: A contractor invoices you $1,000 and doesn’t quote an ABN. Withhold $470 (47%) and pay the contractor $530. Report and remit the $470 to the ATO.
- Invoice with GST: A supplier invoices $1,100 (including $100 GST) but doesn’t quote an ABN. Withhold $517 (47% of $1,100) and pay $583. You still claim your input tax credit (assuming it’s a creditable acquisition and you hold a valid tax invoice), but you must meet the withholding obligation.
Note: If the supplier later provides a valid ABN and you’re still in the same reporting period, you may be able to adjust - but don’t rely on this. The cleanest approach is to pause payment until you obtain the ABN or a valid exception.
How Do You Report No ABN Withholding?
- Register (or ensure you’re registered) for PAYG withholding.
- Report the amount withheld at the BAS label for Amounts withheld where no ABN quoted (commonly label W4 on the BAS).
- Remit the withheld amount with your BAS by the due date.
- Keep records tying the withholding to the supplier and invoice (copies of invoices, correspondence, and any statements by a supplier).
Practical Steps: Onboarding Suppliers And Paying Someone Without An ABN
The best way to manage risk is to prevent it. Add these steps to your supplier onboarding and accounts payable process.
1) Collect Supplier Details Upfront
- ABN and registered name (or trading name).
- Confirmation whether they are registered for GST (and their tax invoice details).
- Bank details and contact.
- If they don’t have an ABN, request a completed Statement by a Supplier if an exception applies.
Use a standard template or form. If a supplier insists they’re “just a small side gig,” point them to resources on running a business without an ABN and encourage them to consider registering to avoid delays in payment.
2) Verify The ABN
Quickly verify the ABN is valid and active, and that the legal name matches, before you approve the supplier. Here’s how to check if an ABN is active.
3) Tighten Your Approval Workflow
- Make “ABN collected/verified” a mandatory tick-box in your procurement or AP system.
- Set rules so invoices missing an ABN automatically route back to the sender.
- If you decide to proceed without an ABN (and no exception applies), calculate and apply 47% withholding before payment is approved.
4) Reflect Withholding In Your Payment And Records
- Pay only the net amount to the supplier (invoice less 47%).
- Record the withheld amount against the supplier’s invoice and in your BAS preparation file (W4 label).
- Keep copies of any Statement by a Supplier and correspondence showing how you assessed an exception.
Contracts And Terms That Help You Manage ABN Compliance
You can significantly reduce admin and risk by baking ABN requirements into your standard contracts and ordering documents.
Contractor Agreements
For independent contractors, make sure your Contractors Agreement requires the contractor to quote a valid ABN, warrant their GST status (if any), and acknowledges that you may withhold 47% if they fail to quote an ABN. This sets expectations and gives you a clear basis for withholding if needed.
Terms Of Trade / Purchase Terms
If you buy goods or services regularly, include an ABN requirement and withholding right in your Terms of Trade or purchase order terms. Make it clear that:
- Suppliers must issue compliant invoices that include their ABN.
- You may withhold under PAYG if no ABN is quoted and no exception applies.
- Any withheld amount is a reduction in the amount payable, not a debt you owe to the supplier.
Invoicing Rules And Payment Terms
State your invoicing requirements upfront, including ABN and tax invoice requirements, within your payment policies or supplier onboarding pack. If you’re revisiting your workflow, it can also be a good time to update your invoice payment terms to reduce late payments and clarify approval steps.
What If A Supplier Says They Don’t Need An ABN?
Some suppliers are genuinely not required to have an ABN - for example, they’re not carrying on an enterprise and the work is a one-off personal sale, or it’s a hobby craft they’re not commercialising.
If that’s the case, ask them to complete the ATO’s Statement by a Supplier form and keep it with your records. If the activity is edging into being a business, encourage them to consider the pros and cons of having an ABN so their invoices can be paid in full without withholding.
If you’re unsure whether their activity is a hobby or business, assess the practical indicators (intention to profit, repetition, scale, businesslike systems). This overview on business activity can help you frame the discussion.
Common Mistakes To Avoid
- Paying first, chasing ABN later. Flip the sequence: collect and verify ABN before approval.
- Ignoring invoices under $75 (ex GST). The small payment exception is per invoice and excludes GST. Don’t aggregate multiple small invoices to avoid the rule.
- Mixing up employees and contractors. PAYG employee withholding and super rules are a different regime. If you’re unsure of the classification, get advice early; start by ensuring your contractor documentation is fit for purpose.
- Assuming cash payments avoid obligations. They don’t. See the guidance on cash-in-hand risks.
- Not reporting on the BAS. Amounts you withhold for no ABN must be reported at the W4 label and remitted on time.
- No contractual right to withhold. While the tax law allows (and requires) you to withhold, having clear terms in your purchasing documents reduces disputes and payment delays.
Quick FAQs For Small Businesses
Do I have to withhold if the supplier emails me their ABN but it’s not on the invoice?
If you obtain and keep a record of the ABN tied to the supplier and supply, you generally don’t have to withhold - the requirement is that the ABN is “quoted” to you, not necessarily printed on the invoice. Keep the email with your invoice file.
What if the supplier gets an ABN after I’ve withheld?
If the ABN is provided and the facts show it applied at the time of the supply, you may be able to reverse the withholding within the same period. If not, you’ve correctly withheld and remitted; the supplier can deal with credits via their own return. To avoid disputes, make ABN collection a condition of payment approval.
Does withholding change my GST position?
No - GST and PAYG withholding are separate. If you hold a valid tax invoice for a creditable acquisition, you generally claim input tax credits as usual. The withholding only changes the cash you pay the supplier and your PAYG reporting.
Can I just refuse to deal with suppliers without an ABN?
Yes, many businesses set a policy that they only purchase from suppliers with a valid ABN (subject to genuine exceptions like hobby/private sales). That’s often the most practical approach. You can capture this in your terms and supplier onboarding pack.
We’re a small team - what’s the simplest way to stay compliant?
Use a standard onboarding checklist: collect ABN, verify it, ensure your contract or purchase terms require an ABN, and configure your AP system to block invoices without an ABN unless an exception is recorded. If you do pay someone without an ABN and no exception applies, withhold 47%, pay the net, and report it on your BAS.
Key Takeaways
- If a supplier doesn’t quote an ABN and no exception applies, you must withhold 47% from the payment and report it to the ATO.
- Always collect and verify the ABN during supplier onboarding; if there’s no ABN, request a completed Statement by a Supplier where the hobby/private use exception genuinely applies.
- Build ABN requirements into your documents: use a strong Contractors Agreement and clear Terms of Trade that authorise withholding if needed.
- Cash payments don’t avoid compliance - no ABN withholding still applies and should be recorded and reported at the W4 label on your BAS.
- If a supplier resists getting an ABN, point them to practical resources on operating without an ABN and the benefits of registering an ABN so you can pay them in full without delays.
If you’d like a consultation on setting up contractor processes, supplier terms and ABN compliance for your business, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.
