Is SMS Marketing Legal in Australia? What Business Owners Need to Know

Short answer: yes, SMS marketing is legal in Australia. But there are rules, and if you ignore them, you can cop fines up to $2.5 million per day from the ACMA. That tends to get people's attention.

This guide breaks down exactly what you can and can't do with business SMS in Australia. No legal jargon, no fluff. Just the practical stuff you need to know before you hit send.

The Law: Spam Act 2003

The Spam Act 2003 is the main legislation governing commercial electronic messages in Australia. It covers SMS, email, and instant messaging. It's enforced by the Australian Communications and Media Authority (ACMA).

The Spam Act doesn't ban SMS marketing. It regulates it. There are three requirements every commercial SMS must meet:

1. Consent: the recipient must have agreed to receive messages from you
2. Identification: the message must clearly identify who sent it
3. Unsubscribe: every message must include a working opt-out mechanism

Get all three right and you're operating legally. Miss one and you're exposed.

Consent: The Part Most Businesses Get Wrong

Consent is where most businesses trip up. The Spam Act recognises two types:

Express consent

This is when someone explicitly opts in to receive your SMS messages. Examples:

• Ticking a checkbox on a web form that says "Send me SMS offers"
• Texting a keyword like "JOIN" to your number
• Signing a form at your shop that includes SMS consent
• Verbally agreeing during a phone call (though written records are safer)

Express consent is the gold standard. If you have it, you're on solid ground.

Inferred consent

This is where it gets murkier. You can infer consent if there's an existing business relationship and the message is relevant to that relationship. For example:

• A customer bought from you in the last two years and you're sending them a related offer
• Someone gave you their mobile number on a business card at an event
• A client provided their number during a consultation

Inferred consent is weaker than express consent. If someone complains, you'll need to demonstrate the relationship existed and the message was relevant. For peace of mind, always aim for express consent where possible. Read our full guide on SMS opt-in requirements in Australia.

What is NOT consent

• Buying a list of mobile numbers from a data broker
• Scraping numbers from websites or social media
• Having someone's number in your phone from years ago
• A pre-ticked checkbox on a form (this doesn't count as express consent)

If you're using purchased lists for cold SMS, you're breaking the law. Full stop.

Is It Illegal to Send Marketing Texts Without Consent?

Yes. Sending commercial SMS without consent is a breach of the Spam Act 2003. The ACMA can issue infringement notices of $2,220 per message for individuals and $11,100 per message for businesses. In serious cases, courts can impose penalties up to $2.5 million per day.

In practice, the ACMA tends to go after repeat offenders and businesses sending at scale without consent. A single accidental text to the wrong person is unlikely to trigger enforcement. But systematic cold texting from purchased lists? That's the kind of thing that lands businesses in trouble.

Recent enforcement examples paint a clear picture. In 2023, the ACMA fined a real estate company $25,200 for sending SMS messages to people who hadn't consented. In 2022, a health insurance company was hit with over $100,000 in penalties for sending renewal reminders to people who had already opted out. The pattern is consistent: companies that ignore consent requirements eventually get caught.

The Do Not Call Register (DNCR) also applies. If someone has registered their number on the DNCR and you contact them without their consent, you're in breach of the Do Not Call Register Act 2006 as well. You can check numbers against the DNCR before sending, and you should. The DNCR washing service costs a few hundred dollars per year for most businesses and is a small price compared to the alternative.

Are Text Messages Legally Binding in Australia?

This comes up a lot, especially in industries like real estate and trades where deals are sometimes agreed over text.

Australian courts have ruled that text messages can form legally binding contracts in some circumstances. The key case is Stuart v Hishon (2013), where the NSW Supreme Court held that an SMS exchange constituted a binding agreement for the sale of property.

For a text to be legally binding, the same elements that apply to any contract must be present:

• Offer and acceptance
• Consideration (something of value exchanged)
• Intention to create legal relations
• Certainty of terms

So if a tradie texts a quote, the client replies "go ahead", and the tradie starts work, that exchange could be considered a binding agreement. This is one reason why SMS is so useful for tradies: it creates a written record of agreements that might otherwise be verbal.

For marketing purposes, this isn't usually relevant. Your promotional SMS won't accidentally create a contract. But for appointment confirmations, quotes, and service agreements sent via SMS, it's worth knowing that those messages carry legal weight.

Do Text Messages Hold Up in Court as Evidence?

Yes. Text messages are admissible as evidence in Australian courts. They fall under the Evidence Act 1995 (Cth) and equivalent state legislation as "documents" or "electronic communications".

Courts regularly accept SMS records in disputes involving:

• Contract disputes (proving an agreement was made)
• Harassment and stalking cases
• Employment disputes
• Family law matters
• Fraud cases

The key requirements are authenticity (proving the message was sent by who you claim sent it) and relevance. Screenshots are commonly accepted, but carrier records or device forensics carry more weight.

For businesses using SMS marketing, this cuts both ways. Your opt-in records (when someone consented to receive messages) are evidence that protects you if someone complains. But messages you send without consent are also evidence against you. Keep good records.

Is SMS Text Blasting Illegal?

Sending bulk SMS (text blasting) is perfectly legal in Australia, as long as every recipient has given consent and every message includes sender identification and an unsubscribe option.

Thousands of Australian businesses send bulk SMS every day for appointment reminders, promotional offers, event notifications, and customer updates. It's one of the most effective marketing channels available, with a 98% open rate compared to email's 20%.

What makes text blasting illegal is doing it without consent. If you buy a list of 10,000 numbers and blast them a promotional message, that's 10,000 potential Spam Act violations. At $11,100 per breach, the maths is not in your favour.

The right way to do it:

1. Build your list through legitimate opt-ins (web forms, in-store signups, keyword campaigns)
2. Use a compliant SMS platform that handles opt-outs automatically
3. Include your business name in every message
4. Include "Reply STOP to opt out" or similar in every message
5. Honour opt-out requests within 5 business days (ideally immediately)

Platforms like Monster SMS handle compliance automatically. When someone replies STOP, they're removed from your list. Your sender ID is attached to every message. The platform won't let you send to numbers that have opted out.

Is It Illegal to Share Private Text Messages in Australia?

This is more of a privacy question than a marketing one, but it comes up often enough to address.

There's no blanket law in Australia that makes sharing private text messages illegal. However, several laws can apply depending on the context:

• Privacy Act 1988: if you're a business covered by the Privacy Act (annual turnover over $3 million, or a health service provider, or you trade in personal information), sharing customer SMS messages could breach the Australian Privacy Principles
• Telecommunications (Interception and Access) Act 1979: intercepting messages in transit is illegal, but sharing messages you've legitimately received is generally not covered
• State surveillance laws: some states have laws about recording private conversations, though these typically apply to phone calls rather than SMS
• Confidentiality obligations: contractual or professional obligations (like lawyer-client privilege) can make sharing messages a breach of duty

For businesses running SMS marketing, the practical takeaway is: don't share your customers' personal information (including their phone numbers and message content) with third parties without their consent. That's both a legal requirement under the Privacy Act and basic good practice.

What About Digital Marketing More Broadly?

Digital marketing in Australia is legal across all channels: email, SMS, social media, paid ads, and search. Each channel has its own rules.

For email, the Spam Act 2003 applies in exactly the same way as SMS. Same consent, identification, and unsubscribe requirements. The difference is enforcement tends to focus more on SMS because the personal nature of a text message means complaints are more common.

For social media advertising, the Australian Consumer Law (ACL) under the Competition and Consumer Act 2010 governs claims made in ads. Misleading or deceptive conduct, false testimonials, and undisclosed paid partnerships can all trigger ACCC action.

For paid search and display ads, the same ACL rules apply. Google and Meta also have their own advertising policies on top of Australian law.

SMS sits in a unique position. It's the most regulated channel in terms of consent requirements, but it's also the most effective. The 98% open rate means your messages actually get read. The consent requirement means your audience actually wants to hear from you. When you combine those two things, SMS outperforms every other channel for engagement and conversion.

That's why thousands of Australian businesses use SMS as their primary customer communication channel. The regulation isn't a barrier. It's a quality filter that keeps the channel effective by keeping spam out.

How to Stay Compliant: The Practical Checklist

If you're an Australian business wanting to use SMS marketing legally, here's what you actually need to do:

1. Get consent before you send. Use clear opt-in forms. Don't pre-tick boxes. Keep records of when and how people opted in.
2. Identify yourself in every message. Use your business name as the sender ID, or include it in the message body.
3. Include an opt-out in every message. "Reply STOP to unsubscribe" is the standard. Make sure it actually works.
4. Process opt-outs fast. The law says 5 business days. Best practice is instant. Use a platform that automates this.
5. Check the Do Not Call Register. Wash your list against the DNCR before sending marketing messages.
6. Don't send between 9pm and 9am. This isn't technically in the Spam Act, but it's in the ACMA's guidelines and it's common sense.
7. Keep records. Consent records, message logs, opt-out records. If someone complains to the ACMA, you need evidence that you did the right thing.

If that sounds like a lot of admin, it doesn't have to be. A good SMS platform handles most of it automatically. Monster SMS, for example, manages opt-outs, sender identification, and compliance records without you having to think about it. You focus on writing good messages. The platform handles the legal bits.

Frequently Asked Questions