Tax Deductions Every Australian SME Misses

Most Australian small businesses don't get audited into paying more tax — they simply leave legitimate deductions on the table because nobody claimed them. The misses are rarely exotic. They're ordinary expenses that fell through a gap between the business owner, the bookkeeper and the accountant, or costs that don't look deductible until you understand the rule. Here are the ones we see slip through most often.

Home office and mixed-use running costs

If you or your team do genuine business work from home, a share of running costs can be deductible — electricity, internet, phone, and depreciation on equipment used for work. The ATO offers more than one method for claiming this (a fixed-rate-per-hour approach and an actual-cost approach), and the right one depends on your records. The mistake owners make is either claiming nothing because it feels fiddly, or claiming without keeping the diary or records the ATO expects. Decide on a method, keep the substantiation it requires, and it's a real deduction. Check the current rate and record-keeping rules on the ATO site, as both change.

The instant asset write-off — when it applies

Depending on the income year and your aggregated turnover, eligible businesses can immediately deduct the cost of certain assets rather than depreciating them over years. This is one of the most valuable and most misunderstood concessions, because the threshold and eligibility change from year to year and are sometimes legislated late. Don't assume last year's rules apply — confirm the current threshold and cut-off with the ATO or your accountant before you buy, because the timing of when an asset is installed ready for use can decide whether you get the deduction this year or next.

Accounting, software and subscription costs

The tools that run your business are deductible, and this is a surprisingly common miss because these charges hit the personal card or an obscure line item. Accounting and bookkeeping fees, your practice management or POS software, cloud storage, professional subscriptions, and the cost of your connected back office stack all generally qualify as business expenses. The fix is process, not knowledge: run business subscriptions through a business account so they're captured automatically.

Interest, fees and the cost of finance

Interest on genuine business borrowings, merchant fees on card payments, and bank charges on business accounts are commonly under-claimed because they're small, frequent, and buried in the bank feed. Loan establishment and account-keeping fees can also be deductible, sometimes over several years. If you've financed equipment or a vehicle, the interest component (as distinct from the principal) is the deductible part — and separating the two is exactly the kind of thing that gets missed when nobody's looking closely.

Vehicle and travel costs done properly

Business use of a vehicle is deductible, but the claim lives or dies on records. The logbook method can be worth considerably more than the cents-per-kilometre method for higher-use vehicles, yet many owners default to the simpler method because they never kept a logbook. Parking, tolls, and genuine business travel and accommodation are all claimable. The discipline of a logbook for a representative period is a small cost for what it can unlock.

Bad debts, write-offs and prepayments

A debt you've genuinely given up on can be written off as a bad debt before year end, which can reduce your assessable income — but you have to actually write it off in your accounts, not just feel bad about it. Similarly, prepaying certain deductible expenses before the end of the income year can bring the deduction forward. And obsolete stock or scrapped equipment can often be written down. These are timing plays that need a conversation with your accountant before 30 June, not after.

The real fix: capture, don't chase

Almost every missed deduction traces back to a capture problem, not a rules problem. Personal-card purchases, cash spends without receipts, and subscriptions nobody logged are invisible to your accountant, and an accountant can't claim what they never see. A clean system — every business expense through a business account, receipts captured at the point of spend, categories reviewed monthly — recovers more tax than any clever strategy. Systemising this is one of the highest-return jobs in the business; our guide on how to systemise your business covers the setup.

This is general information, not tax advice. The concessions above have eligibility rules and thresholds that change, so confirm the specifics for your situation with a registered tax agent before you rely on them.