You've delivered the goods. You've done the work. You sent the invoice - and then… silence. For Australian businesses of every shape and size, from a Penrith-based graphic designer to a Sydney production house, unpaid invoices are one of the most frustrating realities of operating on credit terms. When that silence stretches on long enough, what started as a receivable becomes something else entirely: bad debt in accounting.
Understanding bad debt isn't just a box-ticking exercise for compliance. It directly impacts your profit and loss, your balance sheet, and - critically - your tax position with the ATO. Getting it wrong can throw your financial reporting out of tune, overstate your assets, and leave you scrambling when the write-offs inevitably come. Getting it right, on the other hand, gives you a clear-eyed, accurate picture of your business's financial health.
This guide breaks down exactly what bad debt in accounting means for Australian businesses, how it's recorded, how it's estimated, and what the ATO expects from you.
Bad debt in accounting refers to a monetary amount owed to a business that is deemed unlikely to be recovered - and for which the business is no longer willing to pursue collection. Think of it as the financial equivalent of a dead string on your guitar: it was part of the instrument, but it's no longer doing any work.
According to the Australian Taxation Office (ATO), a bad debt is one that is "uncollectable after the business has made all reasonable efforts to collect it." Critically, the characterisation of a debt as either bad or merely doubtful carries significant weight - it determines whether writing that debt off is deductible for tax purposes.
Common triggers for bad debt include:
These three terms get tangled together constantly, but they represent distinct concepts in accounting - and confusing them can lead to serious reporting errors.
A doubtful debt is a receivable that might become uncollectable. It's a suspicion, not a confirmed loss. It represents amounts that are expected, but not yet confirmed, to be uncollectable. Importantly, a mere doubtful debt provision is generally not deductible for tax purposes in the current financial year - it may evolve into a bad debt in subsequent years.
A bad debt, by contrast, has been identified as genuinely uncollectable. It requires evidence - not just expectation - that the amount will not be repaid. Under Australian accounting standards, this distinction matters enormously.
In short: bad debt is the hit you've already taken; bad debt expense is you preparing for the hits you're expecting.
In Australia, bad debt accounting is primarily governed by AASB 9 Financial Instruments, which applies an Expected Credit Loss (ECL) model - a forward-looking approach that replaced the old "wait for something bad to happen" incurred loss framework.
There are two recognised methods for recording bad debt:
This method involves directly removing the uncollectable amount from accounts receivable and recording it as an expense in the period it becomes uncollectable. It's straightforward but considered aggressive - and not preferred under GAAP or IFRS for material amounts, because it fails to match expenses to the revenues they relate to.
This is the more robust approach. At the end of each financial year, an estimate is made of the likely bad debts and recorded as a contra-asset account - the Allowance for Doubtful Accounts - which sits against accounts receivable on the balance sheet.
Here's how the balance sheet presentation looks:
| Line Item | Amount |
|---|---|
| Accounts Receivable (Gross) | $100,000 |
| Less: Allowance for Doubtful Accounts | ($3,000) |
| Accounts Receivable - Net Realisable Value | $97,000 |
This approach ensures the matching principle is followed - bad debt expense is recognised in the same period as the related sale, giving a more accurate picture of financial performance.
The key journal entries work as follows:
Recording the allowance:
Writing off a specific uncollectable account:
Recovering a previously written-off debt: First, reverse the write-off (Debit: Accounts Receivable / Credit: Allowance), then record the cash receipt (Debit: Cash / Credit: Accounts Receivable).
There's no single right way to estimate bad debt - but the method you choose should reflect the size, complexity, and nature of your receivables. Two primary methods are widely used.
This method applies a historical bad debt percentage to your net credit sales to estimate the expense for the period.
Example:
Simple, consistent, and easy to apply - but it doesn't account for the age of individual receivables.
This is the more precise approach, grouping outstanding receivables by how overdue they are and applying escalating default percentages to each age bracket. Older receivables carry higher risk - much like a track that's been sitting unmixed for months.
| Age Category | Outstanding Amount | Expected Default Rate | Estimated Bad Debt |
|---|---|---|---|
| Current (0–30 days) | $600,000 | 1% | $6,000 |
| 31–60 days | $300,000 | 5% | $15,000 |
| 61–90 days | $150,000 | 20% | $30,000 |
| 90+ days | $100,000 | 60% | $60,000 |
| Total | $1,150,000 | $111,000 |
If the current allowance balance already sits at $5,000, the additional provision required is: $111,000 − $5,000 = $106,000
Under AASB 9, businesses may also use a Provision Matrix as a practical expedient - particularly useful for trade receivables - which applies historical default rates (adjusted for forward-looking information) across the ageing schedule.
The ECL model also allows for a more technical calculation:
ECL = Probability of Default (PD) × Loss Given Default (LGD) × Exposure at Default (EAD)
For example, a loan of $500,000 in Stage 1 with a 12-month PD of 3% and an LGD of 45% produces an ECL of: 0.03 × 0.45 × $500,000 = $6,750
For Australian businesses operating on an accruals basis, a bad debt may be deductible - but the ATO has specific requirements that must all be satisfied before you can make a claim.
Evidence of collection efforts - reminder notices, phone calls, emails, legal proceedings - is critical. The ATO expects receipts, not just rock stories.
If you account for GST on a non-cash (accruals) basis, you may be entitled to a decreasing adjustment (GST relief) where:
Note: You cannot claim this adjustment if you've forgiven, waived, or set off the debt against another liability.
Please note: This article is general in nature and does not constitute financial or tax advice. Every business situation is unique - speak with a qualified accountant for advice specific to your circumstances.
Prevention is always the better gig. Robust bad debt management starts well before an invoice is overdue.
Before extending credit, review a customer's financial statements, credit history, trade references, and industry conditions. Tools like Days Sales Outstanding (DSO) - calculated as (Accounts Receivable ÷ Total Credit Sales) × Number of Days - can reveal early warning signs of collection risk.
Document your payment terms, late fees, and escalation procedures upfront. Ambiguity is your enemy.
Accounts receivable software that sends automated reminders and tracks ageing in real time is essential for any business with significant receivables exposure. If an invoice hits 60 days without movement, it's time to turn up the volume on your follow-up.
Offering early payment discounts (for example, 2/10 net 30 - a 2% discount for payment within 10 days on a 30-day invoice) can significantly reduce your average collection period and the risk of accounts ageing into bad debt territory.
Bad debt in accounting isn't just an unfortunate inevitability - it's a manageable risk when you have the right systems, the right standards, and the right information. Under AASB 9, Australian businesses are required to take a forward-looking, evidence-based approach to estimating credit losses, ensuring that financial statements reflect reality rather than optimism. The difference between a business that thrives and one that finds itself constantly chasing unpaid invoices often comes down to how seriously they treat their accounts receivable - and whether they have a properly calibrated allowance in place to absorb the inevitable misses.
Whether you're a creative professional, a small business in Penrith, or a growing Sydney enterprise, understanding bad debt in accounting gives you the clarity to make smarter decisions, protect your cash flow, and keep your financial reporting honest.
A doubtful debt is a receivable that might become uncollectable—a risk that remains unconfirmed—whereas a bad debt has been confirmed as uncollectable based on evidence. This distinction is important for tax purposes in Australia because only confirmed bad debts that meet ATO criteria can potentially be claimed as deductions.
It can be, but only if the three ATO conditions are met: the income has been included in your assessable income, the debt is genuinely bad (not just doubtful), and it has been formally written off before the end of the income year in which you're claiming the deduction. Businesses on a cash basis cannot claim bad debt deductions.
The allowance for doubtful accounts is a contra-asset account on the balance sheet that estimates the portion of receivables that the business does not expect to collect. It helps reduce the gross accounts receivable to its net realisable value and is established concurrently with the related sale under the allowance method preferred by AASB 9.
The direct write-off method removes the uncollectable amount directly from accounts receivable and records it as an expense when the debt is deemed bad, while the allowance method estimates expected bad debts at the end of the period and records them as a contra-asset account. The allowance method better matches expenses to the related revenues and is preferred for financial reporting under AASB 9.
Under AASB 9, bad debt is estimated using the Expected Credit Loss (ECL) model, which is calculated as: ECL = Probability of Default (PD) × Loss Given Default (LGD) × Exposure at Default (EAD). Businesses may also use an accounts receivable ageing method or a provision matrix based on historical default rates adjusted for current and forward-looking information.
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