The choices you make early on stick around far longer than most people expect. They shape the tax you’ll owe, the reliefs you can still reach for down the line, and how exposed you are personally if things go sideways. The structure of your business, when you time things, the records you bother to keep, the calls you make before you’ve even earned a pound—all of it is crucial tax planning for new business that feeds into every tax return you’ll ever file.
And the mistakes tend to follow the same script, which is good news, because a predictable problem is one you can dodge.
Think of this guide as a map of those slip-ups, grouped by where your business is right now. From day one, it points you toward something financially solid.
Key Takeaways
Before we get into the stages, there are five habits worth locking in. Keep your personal and business money in separate accounts, and skim off a slice of every sale for tax. Sounds obvious, right?
But tidy books, staying square with Goods and Services Tax (GST) and superannuation, and knowing when to call in an expert all lean on those first two. Treat every one of the five as non-negotiable from the very first day.
The one you really can’t afford to break is mixing personal and business money.
Commingling your funds is the most prevalent and harmful mistake a founder makes, and it does damage on three fronts at once. The second both accounts blur into one, your bookkeeping falls apart. Your Friday coffee sits right next to a client invoice, and pulling them back apart months later burns hours you simply don’t have. That same mess gives the Australian Taxation Office (ATO) a reason to look harder at your returns.
And you lose any honest read on whether the business is actually making money, because one card is quietly paying for both lives. Three separate headaches from one lazy habit. The fix? Opening a second bank account, which costs you nothing.
Here’s the thing about these blunders: over the life of a business, they tend to show up in the same order. Pick the wrong structure early on and that inefficiency tags along for years. Grow a bit, ignore rules like Division 7A, and a casual director’s loan can rear up as a tax bill you never saw coming.
But because the order is so predictable, you can see each one coming and step around it. And the very first decision lands before your business has earned a single dollar.
Foundational Mistakes in Tax Planning for New Business
Your business structure is the one decision that’s hardest to walk back. It quietly sets your tax rate and decides how much of your own money is on the line, shaping how much you actually keep at the end of the year. Trouble is, most founders skim past it because they’re itching to start trading, and then they overpay for years without ever knowing why.
Real tax planning is simple at its core: pay exactly what you owe and lawfully hang onto the rest. Choose the wrong entity and you’ve locked yourself out of that before you’ve even sent an invoice. Our accountants watch it happen every single year, money handed to the tax office that a smarter setup would’ve kept sitting in the business.
Choosing the Wrong Business Structure
How do you balance keeping things easy to run against protecting what you personally own while staying tax-efficient over the long haul? A sole trader is cheap and dead simple, but there’s no wall between the business and your own assets, so debts can chase your house. A company costs more to keep ticking over, yet it puts a proper legal barrier between business debts and your personal wealth.
Before you register anything, run through three quick questions: how much risk are you carrying? Will you be reinvesting your earnings?
And would you want to split income with family? Consider it a gut-check before you sign on the dotted line. Here’s the trade-off in plain terms: freelance writing barely carries any liability, so a sole trader setup is usually plenty there, whereas in construction, with staff on the books and something that could go wrong on every job, the asset protection a company gives you isn’t optional.
Get this call wrong and you’re staring down the cost and paperwork of restructuring down the track. Every option, whether that’s sole trader, partnership, company, or trust, fixes your tax rate and your exposure from the very first payment you take.
Companies really shine when you want to funnel profits straight back into growth. Picture a business that reinvests most of what it makes. A Company (Pty Ltd) pays a flat 25% as a base rate entity, or 30% as a general rate company. Leave that same profit in your own name and it gets taxed at your personal marginal rate, which climbs a whole lot steeper.
The catch? Company profits stay locked inside until you pull them out as wages or dividends. A trust works differently, passing profits down to beneficiaries who are taxed at their own rates, which is handy for families splitting income across a spouse or adult kids sitting in lower brackets. But if you’re ploughing money back in hard, that 25% keeps far more of it working in the business than personal rates ever would.
Using a Personal Address for Company Registration
Say you jot down your home as the registered office; that address becomes a permanent public record, sitting right there on the Australian Securities and Investments Commission (ASIC) database for anyone who cares to look. So if you’re a director running things from your kitchen table, your home address is now out in the open, and ASIC’s post ends up mixed in with your bills and junk mail. Worse, if an important notice lands at an address you’ve long since moved out of, you can miss legal correspondence you were actually meant to act on.
There’s a real danger you’ll fail to receive critical legal notifications altogether. That’s a genuine privacy hole on a public register, and it’s an easy one to dodge.
A Registered Office Address Service keeps your home address off that public record entirely. And it’s not just about hiding where you live, it means ASIC mail arrives promptly at an office where someone’s actually watching for it. Just make sure that service is listed with ASIC before you register the company, not after.
Common Tax Errors in Your First Year
That first trading year moves fast, and when you’re stretched thin, cutting financial corners starts to feel like common sense. It isn’t. Mixing your money together and stuffing receipts in a drawer doesn’t save you time, it costs you real money, tips you into overpaying tax, and puts your name in front of an auditor.
The businesses that stay out of trouble tend to run on three plain habits: they keep clean books, they ring-fence their cash, and they plan for the tax bill long before it’s due. Those habits are what stop a young business bleeding its bank balance dry. And remember, ATO rules already require you to keep records that back up every single business transaction, so you’re going to be doing the paperwork either way.
Botching Your ABN and GST Registrations
Fumbling your ABN and GST setup right at the start is one of those mistakes that quietly follows you around. Every year the Australian Business Register turns down tens of thousands of ABN applications, and the reasons are pretty consistent: the applicant can’t show they’re actually running a genuine enterprise, they’ve typed in wrong details, or they’ve picked a business activity classification that doesn’t match reality. So before you hit submit, double check that the activity you’re registering lines up with what you’ll really be doing day to day.
GST is a different beast. Once your annual turnover reaches $75,000, registration is compulsory, no wiggle room. But registration also controls whether you can claw back the GST you paid on your startup costs. Leave it too late and you kiss goodbye to the GST credits on everything you bought before your registration date, which quietly bumps up what it costs you to keep the doors open.
Not Separating Business and Personal Finances
A fresh consultant buys a $300 online course on a personal credit card. No big deal, right? Then six months roll by, the transaction slips your mind, and come tax time that cost just evaporates, along with the deduction it should have picked up under Training & Education.
A proper business account would have caught it, filed it, and kept the deduction sitting there for you. One shared account does the opposite: it snarls up your BAS, blurs your tax return, and hands the ATO a reason to take a closer look at you.
Setting Up Inadequate Bookkeeping Systems
What’s the number one reason new businesses mangle their Business Activity Statement (BAS)? Shaky bookkeeping. The Australian Taxation Office says most BAS errors trace straight back to messy records, whether that’s the wrong figure for GST collected or paid, PAYG withholding numbers that don’t add up, or fuel tax credits nobody remembered to claim. Once your records are loose, every BAS from the first one onward risks you either under-reporting your income or over-claiming your GST.
The same slip-ups show up again and again. On one return alone, a founder will claim GST on something that was GST-free, completely miss a big expense, and get their income figure wrong. The fix is dull but effective: accounting software that tags each transaction the moment it happens catches nearly all of this before it ever lands on your BAS.
Failing to Set Aside Cash for Tax Bills
The money you never set aside for tax is usually the exact money that ends up sinking a new business. Cash flow problems, according to the Australian Bureau of Statistics, are a primary contributor to businesses going under. That’s why, with our own clients, we get a separate tax account open before their very first invoice even clears.
Here’s the way to think about it. When money comes in, treat it like a full bucket of water. Before you dip into any of it, tip a set share straight into a separate ‘tax jar’ for the ATO.
That slice was never really yours in the first place. You’re just holding onto it for a while.
Missing ATO Deadlines and BAS Errors
The Australian Taxation Office’s late lodgement penalties kick in on their own, and they climb the longer you leave things. The ATO charges the Failure to Lodge (FTL) penalty at one penalty unit for every 28-day stretch a document runs late. For a small enterprise, though, that tally is capped at a maximum of five penalty units in total.
And this stuff adds up fast, in 2023 alone the ATO handed small businesses millions in late-lodgement fines. There is a bit of cover, mind you: bring on a registered tax or BAS agent and safe harbour rules might get you off the hook entirely.
Honestly though, you shouldn’t be counting on safe harbour to bail you out. Lodging on time is always cheaper than talking your way out of a penalty after the fact. The two dates that really matter, your quarterly BAS and your annual return, want to go in your calendar the same day you register your business.
How Much Should You Set Aside for Tax?
For a rough starting figure, the general industry guideline for sole traders is to shift 20, 30% of every invoice into a separate tax account the second it gets paid. That cash basically belongs to the ATO, so if you let yourself spend it like normal income, you’ll come up short when the bill finally arrives. The trick is to open a second savings account, call it ‘Tax’, and suddenly the guideline runs itself without you thinking twice.
GST deserves its own separate discipline layered on top of that, though. If you’re registered, park the full 10% you collect in its own account, kept well away from your income tax savings, and never let those two pools bleed into each other. Software like Xero or QuickBooks will tag the GST on every invoice automatically, so you’re not sitting there doing sums by hand.
And once you’ve got a full annual return behind you, you can tighten that percentage up. Just ask your tax agent to confirm your real effective rate.
Tax Traps That Emerge as You Grow
Everything changes the moment you turn a profit. The moment there’s real money in the company account, actually getting it into your hands stops being a simple transfer. That cash isn’t yours yet. It has to travel to you somehow, as wages, as dividends, or as a loan, and every one of those paths comes with a different tax price tag.
The instinct is to grab whatever route feels quickest and move on. That’s precisely the instinct the rules are built to punish.
Guess wrong, and the extra tax lands on your shoulders, not the company’s.
Incorrectly Paying Yourself from the Company
Money reaches you through one of two doors: wages or dividends. Go the wages way and the company gets to treat what it pays you as a deductible cost, while your salary and director fees show up as personal income taxed at your personal rate. Run a wage, though, and two things follow automatically. You’ve got PAYG withholding to sort out, and the super guarantee applies on top, which is climbing to 12% from 1 July 2025.
Dividends can feel neater on paper, but here’s the catch: they’re paid out of profit the company has already been taxed on. When they reach you franked, they carry franking credits for that tax the company already handed over, and those credits cut down what you’d personally owe on the same money. The problem shows up once your own rate overtakes the company’s. Even a franked dividend might land you with ‘top-up’ tax when your 37% marginal rate sits above the company’s 25%.
Ignoring Superannuation Obligations and Opportunities
To plenty of owners, super is just another bill the ATO strong-arms them into paying. That’s a costly way to see it. Money you put in before tax, your Concessional Contributions, only cops a flat 15% hit once it’s inside the fund.
Line that up against a personal marginal rate of 30%, 37% or 45%, and the gap is huge. Push spare profit into super and it’s taxed at that lower figure rather than yours.
Right now there’s a yearly cap on those contributions. Didn’t use all of it? The Carry-Forward Concessional Contributions rule lets you roll the leftover amount forward for a maximum of five years, provided your total superannuation balance stays below $500,000.
That’s your chance to backfill earlier gaps and still only pay 15% on the way in. How’s that for a deal?
Falling into the Division 7A Loan Trap
A loan from your own company can look like the harmless middle option, dodging both the wage tax and the dividend tax. Not so fast. Division 7A covers any loan a private company hands to one of its shareholders, and if you haven’t got a proper compliant loan agreement in place, the ATO can turn around and tax that money as an unfranked dividend at your personal rate.
This is where ‘wash loans’ trip people up. You pay the loan back, then quietly draw the same amount out again. The ATO isn’t fooled, and the reclassification bites regardless.
The cleanest approach is to steer clear of company loans altogether where you can. If you genuinely have to borrow, keep a compliant agreement running, pay the principal down faster than the minimum, and make sure interest is charged at the current 8.37% rate.
Missing Key Deductions and Asset Write-Offs
So where do founders slip up? Deductions, in both directions. Early on, lots of people overclaim, use the wrong method, or leave money on the table by claiming less than they’re entitled to. That kind of sloppiness is a big part of why the ATO combs through thousands of small-business returns year after year.
As you grow, the bigger loss is usually the deductions designed specifically for businesses like yours that you never touch. The Instant Asset Write-Off is the obvious one. Right up until 30 June 2026, eligible small businesses can write off an asset’s whole cost in the year they buy it, as long as it’s priced up to $20,000, instead of dragging that deduction out over years.
Ignoring Income Splitting and Timing Strategies
Income splitting across the family sounds like a tidy win, and for some businesses it is. In a services business, though, the Personal Services Income (PSI) rules can slam that door shut. Once more than 50% of what a contract pays you comes down to your own personal effort, those rules can kick in and the profit gets attributed straight back to you as an individual.
Clearing the Results Test is what keeps you out of their reach. To be treated as a Personal Services Business, you need to be paid for producing a specific result, supply your own tools and equipment, and wear the cost of fixing any of your work that isn’t up to scratch.
There are quieter timing plays worth having on your radar too. Write off debts you’re never realistically going to collect, take a proper look at how your inventory is valued, and bring forward allowable expenses by pre-paying them before the year ticks over.
Why a DIY Approach to Tax Is a Costly Mistake
Before you decide to run your own tax, BAS, payroll, compliance and bookkeeping, sit down and actually tally what it costs you. On paper it feels like the frugal move, and for the first month or two, sure, it saves you a few dollars. The trouble is that each of those jobs comes loaded with a rule you didn’t even know existed. Miss it, and the bill shows up later, always fatter than it would’ve been.
Now flip it. Hand the work to a professional and the maths turns around completely. You get back all those hours that would’ve vanished into Australian tax law, and a good tax planning specialist isn’t just there to shuffle paperwork. Sharp tax planning services go digging for every legal deduction while keeping your deadlines covered.
Picture the founder who dips into the company account like it’s a personal savings jar. A year or two rolls by, they pull out ‘loans’ to pay the mortgage and the groceries, and it never crosses their mind that anything’s wrong. Then cash gets tight, they finally ring an accountant, and the answer isn’t pretty.
Every one of those withdrawals has quietly built up a Division 7A liability. What they saw as grabbing their own money is now a fat, unexpected tax bill. A proper salary or dividend structure on day one would’ve sidestepped the whole thing, but by the time a professional lays eyes on it, the problem’s already years old.
The numbers get even starker when the ATO decides to take a closer look. One personal trainer got flagged for an audit and was told to produce three years of income statements. The whole thing dragged on for three months.
Her accountant charged a hefty $6,500 purely for handling the audit response. When those fees often kick off at $300 an hour, you can see how quickly that total balloons. And here’s the sting: her audit insurance covered the response fee but not one dollar of the extra tax she was assessed, so she was left digging into her own pocket for the rest.
Paying for advice at the start is insurance, pure and simple. The mistakes it heads off cost a fortune to unwind compared to the tiny price of avoiding them in the first place. All the DIY route really does is push a bigger bill to a far worse moment.
Frequently Asked Questions
We get the same short list of questions over and over. Owners ask them because these rules seem like plain common sense, until there’s actual money on the table. That’s the trap.
Once you treat a “simple” rule as something you can eyeball, you’ve started building a habit that gets expensive fast. And guessing? It has never once shaved a dollar off anyone’s tax bill.
What records should I keep for my business tax return?
The Australian Taxation Office doesn’t leave any wiggle room on this one. You must hold on to every business record for at least five years. The documents to keep include your income, expenses, asset purchases, vehicle logs, and other tax-impactful transactions. Decent bookkeeping software will file and date all of it automatically, so you’re not the one keeping track.
But the numbers alone won’t cut it. You also need the paper trail sitting behind them, so hang on to your invoices, receipts, bank statements, payroll records, and the paperwork for anything you buy or sell along the way.
What’s the difference between an accountant and a BAS agent?
The difference comes down to range. A BAS agent is a registered pro, but their work is limited to Business Activity Statements, GST, PAYG, and the compliance jobs that sit next to those. An accountant, on the other hand, works across the whole board: your tax, your finances, and the bigger strategic calls.
Plenty of businesses use both. One handles the filings that have to go in, the other shapes the thinking that decides what those filings look like.
What should I do if I miss a tax deadline?
Have you already blown past a deadline? Ring the ATO without delay and ask about setting up a payment plan. The worst move you can make here is going quiet and hoping it sorts itself out.
Ignore a deadline and you’ll rack up interest charges and penalties on top of whatever you already owe. So if your books have slipped behind, get your accountant on the phone that same week and straighten things out before it snowballs.
Can I claim business expenses without receipts?
Each claim you put through gets measured against the ATO’s three ‘Golden Rules’, and they’re refreshingly simple. The spend has to be for the business, it has to be split correctly if there’s any personal use mixed in, and you’ve got to have a record to back it up.
No receipt or tax invoice means you can’t satisfy that third rule, so the claim falls over. And where something’s part home, part business, you only get to claim the slice that actually belongs to the business.
When should I hire an accountant for my new business?
Bring one in before you register the business, not once the paperwork’s already lodged. Engaging one early can save you considerable money and anxiety later on. Getting the right tax planning & business advice before you commit to a structure spares you the cost and the headache of pulling it apart down the track.
But there’s an upside beyond just dodging mistakes: it opens up real tax planning for new business from the very first invoice you send. The central principle here is to stay forward-thinking.
One idea sits under all of this. Plan ahead, get solid financial habits locked in from day one, and you’ll keep the tax office happy while leaving your business free to actually grow.
By now you’ve got the full arc: the structure calls you make before the first dollar comes in, the discipline of keeping business and personal money in separate lanes, the fresh rules that turn up the moment you start turning a profit, and what going it alone really costs. Not one of these was a loophole. They’re just the everyday jobs every founder faces anyway, done on time rather than in a scramble.
Keep your records for five years, split your claims properly, ring the ATO before it rings you, and hire an accountant for small business tax planning before you sign a single thing. Handle the plain stuff early, and the pricey mistakes that derail effective tax planning for new business never get their opening.
Explore More Topics: