Your side-hustle stress test: 4 steps before you start

Got a business idea bubbling away? Here’s how to test demand, run the numbers and set up the basics before turning your side hustle into something bigger. 

By Julie Lee

  • A good side hustle starts with proof, so look for real customer interest before spending too much time on branding or launch plans.  
  • Running the numbers early can help you understand pricing, cash flow and how much time your idea may need.  
  • Getting the basics in place, from an ABN to a separate business bank account, can make your side hustle easier to manage. 

Turning a great idea into a thriving business might be easier than you think. A side hustle stress test is a simple way to check whether your idea has demand, can make money and is worth your time before you invest too much in it. 

With more than half of Australians earning money from a side hustle or considering starting one, turning that small idea into reality has never been more viable. Having an idea may be half the battle won but you also need an entrepreneurial mindset. “I know within five minutes of talking to somebody whether they’re going to start a side hustle or not and it has everything to do with their attitude,” says business coach Brook McCarthy from Hustle & Heart. “They’ve got a deep enthusiasm, the ability to spot an opportunity and the energy to actually act on that opportunity.” If that sounds like you, this could be your sign to finally act on that great business idea. 

Step 1: Validate the idea

A lot of potential business owners get caught up doing extensive research and while that’s important, McCarthy suggests the best proof of concept is actually getting a sale. “You don’t need a launch party and a logo. You don’t need a press release telling the world about your side hustle,” she says. “Just get some cash in the door; start by securing a sale. It’s the only experiment that counts.”  

McCarthy calls this a “paid live experiment”. “You need to get that minimum viable service or product out the door as quickly as possible,” she says. “People spend months doing market research, branding, website design and meeting anybody who looks sideways at them. Meanwhile, they’ve sunk all this time and money and got nothing to show for it.” 

Finding your audience will depend on your service or product but this also doesn’t need to be overcomplicated. “I’m a huge fan of marketing but it’s not the first thing that you should be doing,” says McCarthy. “Pitching and reaching out and using your existing network is a great way to start. Finding an audience is about relationships.” 

“Reaching out and using your existing network is a great way to start.” – Brook McCarthy

Step 2: Work out your pricing and cash flow

Once you’re confident in your idea, do the numbers. Decide how much you need your side hustle to be earning and the value of the service or product you’re delivering. Think about cash flow and then set your pricing. “It’s useful to do a profit plan,” says McCarthy. “I have a spreadsheet for the profit plans I do with clients but when I started my own business years ago, it was literally back-of-the-envelope sums.”

But a word of warning: be realistic. “A lot of new business owners make the mistake of going, ‘Okay, my old salary was this so if I’m going to make the same amount, I need to divide the working week by 40 and charge this much,’” McCarthy says. “Your capacity is way less than that – you’re not going to have 40 billable hours a week.”

Step 3: Set yourself up with business basics 

While McCarthy advocates for moving fast, there are some admin tasks that can’t be skipped. “You need an ABN, which doesn’t cost anything,” she says. “A separate business bank account is also a smart move to make your life easier.”

Other savvy ideas include getting low-priced bookkeeping software and a professional email address. “There are too many people with a Gmail address who’ve been in business for decades,” says McCarthy.

Step 4: Decide whether to grow it

You’ll have a lot of data on your business idea by now. You’ll know more about the market, your audience, pricing and costs. You’ll also know where you need to focus your efforts in the future so now is the perfect time to reassess. Ask yourself if the project is still viable and check in on how you’re feeling. “I call running a business ‘hard fun’,” says McCarthy. “It’s fun and I can’t believe I get paid to do what I do but there’s no denying it – it’s not easy.”

Get more help for starting out

Here are some resources for entrepreneurs:

CommBank Business Masterclass

Build practical skills across cash flow, marketing, AI, digital safety and more.

CommBank Yello for Business

Check out the CommBank app for benefits and discounts on things like bookkeeping software for eligible CommBank business customers.

Talk to a business coach

“A business coach can spot blind spots and shortcuts, helping you collapse timelines and make your business more successful faster,” says McCarthy.

To learn about how CommBank backs small businesses, visit the CommBank small business hub.

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Published: 28 July 2026

Things you should know

An earlier version of this article was published in Brighter magazine.

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