No ABN? What You Need To Know

“No ABN” pops up more often than you’d think - on a supplier’s invoice, in a contractor’s onboarding form, or when you’re trying to set up your own venture.

If you’re running a small business in Australia, understanding how ABNs work - and what to do when someone doesn’t have one - can save you time, money and compliance headaches.

In this guide, we’ll walk through what “no ABN” means in practice, your obligations when paying suppliers or contractors who don’t quote an ABN, whether you can operate without one yourself, and the key legal steps to set your business up properly.

What Does “No ABN” Mean For Your Business?

An Australian Business Number (ABN) is a unique 11-digit number that identifies a business to the government, other businesses and the public. You use it on invoices, to register for GST and to interact with the ATO and other agencies.

When a person or entity supplies goods or services in the course of their enterprise but doesn’t quote an ABN on an invoice or other document, tax rules may require you to withhold 47% from the payment (known as “no-ABN withholding”). There are limited exceptions, which we’ll cover below.

From a practical perspective, “no ABN” usually creates one of three issues for a small business owner:

• Payment risk and admin - you may need to withhold and remit 47% to the ATO if the supplier doesn’t meet an exception.
• Compliance risk - it can signal that the supplier may not be operating a genuine enterprise (e.g. it could be a hobby), which affects how you engage them.
• Credibility and trade access - many marketplaces, payment providers and wholesalers require an ABN to onboard you or your suppliers.

Can You Run A Business With No ABN In Australia?

In short, it’s possible, but risky and limiting.

If you’re carrying on an enterprise in Australia, an ABN is expected. Operating without one can make it harder to raise invoices, register for GST, set up trade accounts and be paid by larger customers who require an ABN on supplier records.

There are narrow situations where trading without an ABN may be acceptable (for example, where someone genuinely sells as a private hobby and doesn’t run a business). But most ongoing, profit-making activity in Australia will qualify as a business that should have an ABN.

For a practical rundown of the pros and cons, many owners find it helpful to compare the advantages and disadvantages of having an ABN and what happens if you try to run a business without an ABN.

If you applied for an ABN and were declined, it’s often due to how your activities were described. Common reasons are covered here: why your ABN application was unsuccessful. You can usually re-apply once you meet the criteria for carrying on an enterprise.

Invoicing And Contractors: Dealing With “No ABN” In Practice

Paying An Invoice With No ABN

If a supplier doesn’t quote an ABN on an invoice for a supply made in the course of their enterprise, you may need to withhold 47% of the payment and remit it to the ATO. This is designed to discourage businesses trading without an ABN.

There are limited exceptions where no withholding is required, such as where the supply is $75 or less (excluding GST), the supplier makes a statement that the supply is made in a private capacity (not in the course of an enterprise), or the supply is wholly from an entity that isn’t required to have an ABN (for example, a hobby). The usual way to document an exception is for the supplier to give you a signed “Statement by a supplier” confirming the reason they aren’t quoting an ABN.

Practical tips when a supplier hasn’t quoted an ABN:

• Ask for their ABN and a revised invoice that includes it. You can quickly check if an ABN is active before paying.
• If they genuinely don’t need an ABN (e.g. private sale), request a signed statement to that effect and file it with the invoice.
• If they are clearly trading, but refuse to quote an ABN, consider withholding 47% and remitting it. Keep records of your decision and communications.

Engaging A Contractor With No ABN

Engaging a sole trader contractor who has no ABN raises additional risks. Apart from potential no-ABN withholding, it can increase the chance of a misclassification dispute (i.e. the person is actually an employee, not a contractor).

As a rule of thumb, if the person is working regularly under your direction, using your tools, and you control their hours and method of work, they may be an employee. In that case, onboard them as an employee with a proper Employment Contract and pay entitlements under the Fair Work system.

If they are genuinely an independent business, they should generally have an ABN and provide it to you. In those cases, use a written Contractor Agreement to set scope, deliverables, IP ownership and confidentiality. If they won’t obtain an ABN, consider whether it’s appropriate to proceed.

Document the arrangement clearly and adopt a consistent process for verifying ABNs during onboarding. This helps you manage tax and employment risk and keeps your records clean in case of audit or dispute.

Setting Your Business Up: ABNs, Names And Structures

Even if you’re already trading, it’s worth checking that your business is set up correctly for growth and compliance.

Choose A Structure That Fits

• Sole Trader: Simple and low-cost. You use your own ABN and are personally liable for debts.
• Partnership: Two or more people carry on business together. Partners usually share profits and liabilities.
• Company: A separate legal entity with its own ACN and ABN. Offers limited liability and can be better for scaling, bringing in investors and protecting personal assets.

If you’re moving beyond a side gig, many owners opt for a company. It allows you to issue shares, bring on co-founders and limit personal liability. When you take that step, you’ll generally adopt a Company Constitution and (if there’s more than one owner) a Shareholders Agreement to lock in decision-making and ownership.

Register Your ABN And Business Name

Once you’ve chosen a structure, apply for your ABN and register a trading name if you’re not trading under your own legal name. You can register a business name and start using it on invoices, your website and marketing.

It’s common to be confused by naming conventions - an entity name is different to a business name. This quick guide helps clarify entity name vs business name so you can brand consistently across invoices and contracts.

Keep Your ABN Current

Make sure your ABN details stay up to date and active as your business evolves. If you take a break from trading, your ABN may be cancelled, and you can usually reapply when you recommence. If you want to understand how ABNs behave over time, here’s a concise explainer on whether an ABN expires.

What Legal Documents Will You Need?

Getting your ABN sorted is only one part of the setup. Strong, tailored documents help you trade confidently and reduce disputes - especially when you’re enforcing ABN and invoicing standards with suppliers and contractors.

• Terms of Trade: Your core commercial terms with customers, covering pricing, invoicing, delivery, liability and payment defaults. Well-drafted Terms of Trade set expectations up front and support your debt recovery process.
• Privacy Policy: If you collect personal information (e.g. customer details, enquiries or email lists), a compliant Privacy Policy explains how you collect, use and store that data under the Privacy Act.
• Website Terms: If you trade online, your website or platform should have clear Website Terms of Use to set user rules and limit liability.
• Contractor Agreement: Use a written Contractor Agreement when engaging independent contractors. It should set scope, pricing, ABN requirements, IP ownership and confidentiality.
• Employment Contract: If the role looks like employment, onboard properly with an Employment Contract and follow Fair Work requirements.
• Shareholders Agreement: If you have co-founders or investors, a tailored Shareholders Agreement outlines ownership, decision-making and exit arrangements.

It’s also smart to set simple onboarding rules: don’t pay a supplier or contractor until their ABN is verified (or a valid exception is documented). Your contracts and procurement policy can make this a standard condition to protect your business.

Key Takeaways

• “No ABN” on an invoice can trigger 47% withholding unless a clear exception applies - ask for an ABN or a signed statement and keep records.
• Most ongoing, profit-making activity in Australia should have an ABN; operating without one limits how you invoice, register for GST and trade with larger customers.
• When engaging individuals, assess if they’re truly contractors; if not, use an Employment Contract and follow Fair Work rules.
• Choose a structure that fits your growth plans, then register your ABN and business name and keep your details current.
• Protect your venture with core documents like Terms of Trade, a Privacy Policy, Website Terms, Contractor Agreements and (for multi-owner companies) a Shareholders Agreement.
• Build a simple onboarding process to verify ABNs, apply exceptions properly and standardise your invoicing rules.

If you’d like a consultation on handling “no ABN” issues in your business - from supplier onboarding to contracts and setup - you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.