Quick answer
The most common first-year money mistakes are mixing personal and business money, spending GST and tax as if it were income, under-pricing, missing the GST registration threshold, having no cash buffer, paying cash for long-life equipment, not tracking cash weekly, ignoring the second-year tax double-up and leaving the owner's own pay to chance. Each has a simple fix if you set it up early.
Key points
- Separate business and personal money from day one.
- GST and tax set aside weekly — they were never your money.
- Price from your real costs, including your own wage.
- Year two often brings last year's tax plus this year's instalments — plan for both.
The first year in business is thrilling, exhausting and — financially — full of traps nobody warned you about. None of them are exotic. They’re the same handful of mistakes that catch capable, hard-working owners every year, usually because the business grew faster than the systems around it.
Here are nine of the most common, and the fix for each.
1. Mixing personal and business money
The mistake: One account for everything. Groceries next to supplier payments, customer deposits next to your salary.
Why it hurts: You can’t see how the business is really performing, tax time takes days instead of hours, and any lender reviewing your statements has to guess which transactions are business.
The fix: Open a dedicated business account on day one. Pay yourself a regular transfer from it into your personal account. Nothing personal goes through the business account.
None of these mistakes means you’ve failed. They’re the growing pains of a business that’s getting off the ground. The owners who move past them fastest are simply the ones who notice early and put a system in place, rather than relying on memory and good intentions.
2. Treating GST and tax as income
The mistake: Seeing $110,000 in the bank and thinking the business earned $110,000.
Why it hurts: If you’re registered for GST, $10,000 of that belongs to the ATO. Some of what’s left will be income tax. When BAS arrives, the money has been spent.
The fix: Every week, move net GST, any PAYG withheld from staff and an income tax allowance into a separate account. Our guide on how much to set aside for tax shows how to size it.
3. Missing the GST registration threshold
The mistake: Not noticing when turnover crosses the line.
Why it hurts: The ATO says you must register for GST once your GST turnover reaches $75,000, and within 21 days of becoming required to. Registering late can mean owing GST on sales where you never charged it.
The fix: Track rolling 12-month turnover monthly. When you’re approaching $75,000, talk to your accountant and plan the change — including how your prices will handle GST.
4. Under-pricing
The mistake: Setting prices by looking at competitors, then shaving a bit off to win work.
Why it hurts: You get busy and stay broke. And it’s much harder to raise prices later than to start in the right place.
The fix: Build a floor price from your real costs, a fair wage for yourself and realistic billable hours. Our guide on how to price your services walks through it step by step.
5. No cash buffer
The mistake: Running the account close to zero because every dollar seems needed.
Why it hurts: One late customer, one broken machine or one quiet month and wages are at risk.
The fix: Set a minimum balance and build towards it deliberately — a small percentage of every week’s takings until you get there. Use a 13-week forecast to see how big it needs to be.
Halfway through this list and recognising your own first year? Check what support you could qualify for — there’s no credit check to ask.
6. Paying cash for everything
The mistake: Buying the van, the equipment and the fit-out outright because debt feels risky.
Why it hurts: Assets that earn income over five years are paid for from this month’s working capital. The business ends up asset-rich and cash-poor.
The fix: Match long-life assets with finance over a similar term, so the asset helps pay for itself. Keep cash for working capital. Our feature on when to borrow has seven tests to decide.
7. Not tracking cash weekly
The mistake: Looking at the numbers only when the accountant sends them — or when something goes wrong.
Why it hurts: By the time you notice, the problem is weeks old.
The fix: A 30-minute weekly money routine: bank balance, overdue invoices, upcoming bills, tax transfer, forecast, one action.
8. The second-year tax double-up
The mistake: Enjoying a first year with no income tax bills, and assuming year two will be the same.
Why it hurts: After you lodge your first return, you pay the tax on that year’s profit. The ATO may then enter you into PAYG instalments — regular prepayments towards the current year’s tax. Two lots of tax can land within a few months of each other.
The fix: Set aside for income tax from your very first profitable month. When the instalment notice arrives, you’ll already have the cash. Our explainer on PAYG instalments covers the options.
9. Leaving your own pay to chance
The mistake: Taking whatever’s left at the end of the month, if anything.
Why it hurts: It makes personal budgeting impossible, hides whether the business is really profitable and quietly burns out owners.
The fix: Decide what the business pays you, pay it on a schedule and include it in your pricing and forecasts. Our feature on how to pay yourself covers sole traders and companies.
What should a first-year owner set up in week one?
| Set-up task | Time | Pays off by |
|---|---|---|
| Separate business bank account | 1 hour | Clean records, easier tax and funding |
| Separate tax account | 15 minutes | No BAS shocks |
| Accounting software with bank feeds | 2–3 hours | Weekly reporting in minutes |
| Pricing built from real costs | 2 hours | Profitable work from the start |
| A 13-week forecast | 1 hour | Seeing gaps in advance |
| Weekly routine in the calendar | 5 minutes | Catching problems early |
How do these mistakes affect future funding?
Lenders read your bank statements and tax records as the story of how you run the business. Mixed accounts, missed BAS payments and unexplained overdrawn periods make the story harder to follow. Clean, separate accounts, steady deposits and up-to-date lodgements make it easy. Fixing these habits early isn’t just good management — it builds the track record you’ll lean on when you need capital to grow.
What should you do at the end of your first year?
Your first anniversary is a good moment for a money reset. Book an hour with your accountant and work through:
- Profit versus cash. Why the two differ, and where cash is tied up — debtors, stock, equipment. Our feature on reading a profit and loss statement helps you follow the conversation.
- Tax for the year just finished, and any PAYG instalments likely to start.
- Pricing. Compare your real billable hours and costs with the assumptions you started with.
- Structure. Whether sole trader is still the right fit as profits grow — see sole trader vs company.
- Your own pay. Set a regular, sustainable amount for year two.
- The next 12 months. What you want to build — a hire, equipment, a new service — and how it will be funded.
Write down three decisions from the meeting and put them in your calendar. A first year that ends with a plan sets up a second year that grows on purpose.
Year one done — what about year two?
The second year is usually when growth really starts: the first hire, a bigger contract, better equipment. It’s also when the tax double-up and a lack of buffer can bite hardest. Having funding options lined up before you need them turns a stressful stretch into a manageable one.
We consider trading businesses for unsecured and cash-flow facilities typically from $5,000 to $500,000, and property-secured loans from $20,000 to $5,000,000, including for newer businesses where security is available. The enquiry takes about a minute and doesn’t include a credit check. We don’t circulate your details to a list of lenders, and a real person looks at your situation and calls you. Please give us accurate details — how long you’ve been trading, your turnover and what the funding is for — so we can tell you straight away what’s realistic.
Frequently asked questions
When do I have to register for GST?
The ATO says you must register once your GST turnover reaches $75,000 or more (or $150,000 for non-profits), and you need to register within 21 days of becoming required to.
Should I have a separate business bank account as a sole trader?
Yes. It isn't always legally required for sole traders, but it makes record-keeping, tax time and any future funding application far simpler.
Why is my second year of business so expensive for tax?
Often because you pay the tax on your first year's profit after lodging your return, and the ATO then starts PAYG instalments towards the current year. Two lots of tax can land close together.
How much buffer should a new business keep?
Enough to cover several weeks of fixed costs and your own essential living costs is a sensible aim. Your 13-week forecast will show whether that's enough for your particular cash cycle.
Can a new business get finance?
It can be harder, because lenders like trading history. Options often depend on security — for example, property you own — and on your experience and plan. An enquiry will tell you what's realistic.