Hitting $75,000 in turnover is a massive milestone for any small business. It’s the moment you realise your side hustle or solo venture is officially a real business. But in Australia, this milestone comes with a regulatory rite of passage: the mandatory requirement to register for Goods and Services Tax (GST).

The trap happens when business owners try to protect their customers from a sudden price hike and decide to absorb the cost themselves.

It sounds noble, but the math is brutal.

If you sell a service for $100 before registering, you keep that full $100 (minus your usual expenses). Once you register, if you keep your price at $100, that price is now legally considered inclusive of GST.

The 1/11th Bite: You don't just lose 10%; you owe the Australian Taxation Office (ATO) exactly 1/11th of that total sale. On your $100 price tag, $9.09 now belongs to the government. Your actual revenue instantly drops to $90.91.

If you are running on tight profit margins, swallowing a 9% drop in gross revenue can completely wipe out your take-home pay. You are essentially working just as hard - if not harder - to make less money.

How It Looks to Your Customers (The Rock and a Hard Place)

If you decide you can't absorb the cost and you choose to raise your prices by 10% overnight, you face a different problem: customer perception.

For your existing clients, a sudden jump from $100 to $110 for the exact same service or product can feel jarring.

• For everyday consumers (B2C): They bear the full brunt of that extra 10%. To them, it looks like a random price hike, which can spark complaints or cause them to look for cheaper, non-registered competitors.

• For other businesses (B2B): They usually don't mind as much because they can claim that 10% back as an input tax credit. However, the sudden change in your invoicing still requires them to adjust their bookkeeping, and it signals that you’ve changed your business structure.

Trying to explain, "Sorry, I'm bigger now, so the government makes me charge you more," is a tough marketing pitch.

The Alternative: Thinking Big and Registering from Day One

This dilemma is exactly why many financial experts and seasoned entrepreneurs recommend a different strategy: voluntary registration from the very start.