Business Overdraft in Australia: How It Works and How to Choose
Business Overdraft
Australian business · Unsecured and secured · Bank and non-bank
This guide helps you decide between bank and non-bank overdrafts, secured and no-property options, and lenders with different eligibility and approval speeds. It also covers what to do when the bank says no, and links to the full business overdraft rates and fees comparison.
Quick Answer
A business overdraft lets a business transaction account run below zero up to an approved limit, with interest charged only on the amount used. Banks and non-bank lenders both offer them, on very different limits, fee structures, security requirements and approval speeds. If a bank has capped, declined or slow-walked your facility, non-bank options exist without property security, and the numbers on this page show how they compare.
Compare costs
Use the full lender breakdown to compare business overdraft interest rates and fees.
What business overdraft limits actually exist in 2026?
Unsecured business overdraft limits in Australia currently top out at $50,000 at NAB, $200,000 at ANZ and $250,000 at CommBank and Westpac, based on each lender's published product pages as at 22 August 2026. Non-bank lenders advertise substantially higher ceilings, with facilities published to $2 million, though the structure changes as limits rise: above roughly $100,000 to $150,000 most lenders want property involvement or registered security, and above $500,000 full financial statements typically enter the picture.
Secured overdrafts, backed by residential or commercial property, have no meaningful published ceiling at the majors; the limit becomes a function of the security and servicing rather than a product cap.
Two thresholds matter more than the headline ceiling, and they are different thresholds that often get blurred together:
The no-property threshold
Roughly $100,000 to $150,000, depending on lender. Below this line, non-bank lenders will typically lend against business revenue alone: no property security, assessed on bank account data. Above it, expect requests for property involvement, a registered security interest over business assets, or both.
The low-doc threshold
Roughly $500,000 on the non-bank side. Below this line, applications commonly run on a completed application and six months of business bank statements, with no financial statements or tax returns. Above it, up-to-date financials, aged payables and receivables, and the ATO position typically come into scope.
If the amount you need sits under the first threshold and your revenue supports it, property ownership is not the gate the bank made it feel like. Between the two thresholds, the question becomes what security short of your home you are willing to give.
If this is your situation
Bank approved a limit the business has outgrown? The overdraft limit too small guide covers how limits get sized, running a second facility alongside the bank, and when a top-up beats a refinance.
How do business overdraft costs differ between lenders?
Rate and fee structures differ by lender: interest is usually charged on the drawn balance, while line, service or facility fees may be calculated on the full approved limit or charged as a flat annual amount. A lightly used facility can therefore have a different cost ranking from one that stays heavily drawn, so use the full business overdraft rates and fees comparison to compare the lender structures and worked totals.
What is a business overdraft interest rate and how is it calculated?
The interest rate applies only to the overdrawn balance, calculated daily while the account is in debit and charged monthly on most published products. NAB, for example, states interest is calculated daily on the funds used and charged on the last banking day of the month. That is why the effective cost of an overdraft depends on how many days the account spends below zero, not on the limit: the limit drives the line or annual fee, and the drawn balance drives the interest.
What would a $50,000 business overdraft cost for 30 days?
Worked from published figures at 22 August 2026: $50,000 drawn for 30 days at the lowest advertised bank rate of 14.80% accrues about $608 in interest, and at the top of the published non-bank band at 24.95% about $1,025, in both cases before the facility's ongoing fee. The same facility fully repaid after 5 days accrues roughly one sixth of that, which is the product working as designed: short draws are cheap, long draws are expensive, and a balance that never clears is a term loan wearing the wrong price.
Is business overdraft interest tax deductible?
Generally yes, where the drawn funds are used for business purposes: interest and facility fees on business borrowing are ordinarily deductible business expenses. Mixed-purpose drawings complicate the apportionment, which is a question for your accountant, and nothing here is tax advice.
Secured vs unsecured: what unsecured actually means
Unsecured means no specific asset is mortgaged to the facility. It does not mean no one is standing behind the debt. Across banks and non-banks alike, an unsecured business overdraft almost always involves a personal guarantee from the directors, and at higher limits, commonly a general security agreement (GSA) registered on the Personal Property Securities Register over the company's assets. Westpac states that director guarantees may be required for corporate borrowers on its unsecured product; the same expectation runs through the non-bank market as standard practice.
That distinction matters because it is materially different from mortgaging your home, and it is the exact line a bank conversation often blurs. A director guarantee exposes the guarantor if the business fails to pay. A registered GSA sits over business assets like plant, receivables and inventory. A property mortgage puts a specific titled asset directly behind the facility. Moving down that list, pricing improves and limits rise, which is why secured facilities are advertised from 8.75% p.a. while unsecured bands run five to sixteen points higher.
| Level | What the lender holds | Typical effect |
|---|---|---|
| Unsecured with director guarantee | Personal guarantee from all directors; spouse or non-director guarantors sometimes accepted | Fastest approval; lowest limits; highest rate band |
| Unsecured with GSA | Guarantees plus a registered security interest over company assets, common on larger aggregate exposures | Higher limits without property; rate band unchanged or slightly better |
| Property secured | First or second mortgage, or caveat, over residential or commercial property | Lowest rates; highest limits; slowest to settle because valuation and legals enter the process |
Can a lender ask for a personal guarantee?
Yes, and on unsecured facilities they almost always do: personal guarantees from all directors are the standard setting across the market, with spouse or non-director guarantors sometimes accepted where the file needs support. The guarantee is the reason unsecured lending exists at all, and any director signing one should understand it survives the company.
One pricing detail worth knowing before any application: some non-bank credit models price property ownership itself, even on an unsecured facility. A director who owns property, without offering it as security, can sit in a lower rate band than one who does not, because ownership changes the recovery profile behind the guarantee.
Go deeper
Guarantees, general security agreements, PPSR registrations and how they end: the unsecured business overdraft guide.
Can you get a business overdraft without property security?
Yes. Every major bank now advertises an unsecured business overdraft, and the non-bank market lends further up the limit scale without property than the banks do. The practical ceiling for lending assessed on business revenue alone, with no property involvement, currently sits around $100,000 to $150,000 depending on lender. Below that line, a typical non-bank file is assessed on six months of business bank statements, an active ABN and director identification, with the account data doing the work that financial statements do in a bank assessment.
What changes without property is not eligibility but structure: the rate band starts higher, a director guarantee is standard, and above the no-property line lenders reach for a GSA or property involvement before extending further. What does not change is the product mechanics: interest on the used balance, a limit that revolves as deposits land, and an annual or ongoing fee for holding the facility open.
The renting-director scenario the banks handle worst is exactly where this market is clearest. A business with strong monthly revenue, no property, and a bank that will not move past a $50,000 cap has published options at two to five times that limit on statements alone. The trade is priced in the rate band, and whether it is worth paying is an arithmetic question the cost section above answers, not a character judgement about the business.
If this is your situation
Bank already said no because there is no property? The declined with no property guide covers what non-bank lenders accept instead, what a director's guarantee actually commits, and realistic costs after a decline.
Who qualifies for a business overdraft? The eligibility ladder
Published eligibility criteria form a ladder, and the rungs are further apart than most owners expect. At the strict end, NAB and Westpac both require at least 12 months trading under the current ABN and $75,000 or more in annual turnover, GST registration included. ANZ GoBiz asks for 6 months on the ABN with 6 months of reconciled financial data. On the non-bank side, published entry points run from around 6 months trading and monthly revenue in the low thousands at the accessible end, with common mid-market settings around two years trading, clean recent conduct and a director credit score in the mid 500s or better.
| Lender | Minimum trading time | Turnover requirement | Documents for a standard file |
|---|---|---|---|
| NAB QuickBiz | More than 12 months on the current ABN or ACN | At least $75,000 p.a., GST registered | Online application through internet banking; no physical assets required |
| Westpac | At least 12 months trading with a valid ABN or ACN | More than $75,000 p.a., GST registered | Application plus conduct and structure criteria on the published page |
| ANZ GoBiz | ABN or ACN for at least 6 months | GST registered if turnover is $75,000 or more; turnover under $75 million | Accounting software connection or ANZ account data; decision drawn from live financial data |
| CommBank | Not published | Not published | Registered Australian business, eligible structure, business purpose; fast track inside NetBank for existing customers |
| Non-bank market (published settings) | From around 6 months at the accessible end; around 2 years is a common mid-market minimum | Entry points published from roughly $72,000 to $120,000 p.a. equivalent | Completed application and 6 months of business bank statements for limits to around $500,000; financials and ATO position above that |
Sole traders qualify across most of the ladder: NAB, CommBank, Westpac and ANZ all list sole traders as eligible structures, and the non-bank market lends to sole traders on the same statement-based assessment, with the guarantee falling on the individual directly. If a bank has already refused a sole trader application, the sole trader declined guide covers the entity structure and credit file detail behind those decisions. The full access map by structure, sole trader, company, trust and partnership, and whose credit file each one exposes, is in the sole trader and ABN holder overdraft guide. Startups under six months face the one genuinely hard floor on the ladder; before minimum trading time is met, the realistic options are secured lending or waiting, and no advertised overdraft product changes that.
Two eligibility realities the published pages understate. First, clean recent account conduct carries more weight than owners expect in statement-based assessment: dishonours and overdrawn days in the last six months read directly into the decision. Second, an existing facility with another cashflow lender is commonly disqualifying on the non-bank side, so refinancing and stacking are different conversations than a first facility.
Can a startup get a business overdraft?
Only at the margins. The published floors start around 6 months trading on the most accessible products, and nothing advertised waives minimum trading time entirely. A pre-revenue or first-quarter business is realistically choosing between secured lending against personal assets, founder capital, and waiting until the statement history exists to be assessed. Between six months and two years, the picture is more open than the bank pathway suggests: the under two years trading guide maps that threshold in detail.
Can you get a business overdraft with bad credit?
Impaired credit narrows the ladder rather than closing it. Published non-bank settings run to director scores in the mid 500s, and recent clean conduct in the bank statements can carry a file with older credit events. What reliably declines is recent unresolved trouble: current dishonours, defaults in the last months, or an existing facility in arrears. Where unsecured lending is closed, secured routes against property remain open on different assessment logic. The full damaged-file path, score bands, defaults, ATO debt and when to reapply, is covered in the bad credit and declined guide.
What actually gets a business overdraft approved or declined?
On statement-based assessment, four things do most of the work: revenue level and trend across the six months, account conduct (dishonours and days overdrawn), existing debt commitments visible in the statements, and the credit file behind the guarantee. Industry sector gates some lenders entirely. The advertised criteria are the entry conditions; these four are the decision.
How do you apply for a business overdraft?
Bank digital products run through internet banking with the application drawing on existing account or accounting data. A brokered non-bank file needs the completed application, six months of statements for every business account, and director identification, lodged together. The single biggest controllable factor in both speed and outcome is lodging a complete file once rather than feeding documents in piecemeal. What an assessor actually reads in twelve months of statements is covered in how a lender reads your bank statements, and whether to close an existing facility before applying is covered in should you close a facility before you apply.
Sectors are not all treated equally. Property development and primary agriculture are commonly excluded from non-bank cashflow products, and several lenders restrict mining services. If you operate in one of those sectors, the realistic route is secured or specialised lending rather than an unsecured overdraft.
How fast can a business overdraft be approved in Australia?
Approval speed splits into three published tiers. Existing bank customers on digital products can see instant decisions: CommBank advertises an instant decision with funds within minutes for eligible NetBank applicants, and NAB QuickBiz advertises an instant decision with same-day access to funds once documents are accepted. New-to-bank applicants run slower: ANZ GoBiz advertises a decision in minutes from live financial data with full approval inside about two business days. Non-bank lenders publish decisions in hours for statement-based files, with funding commonly following within 24 to 48 hours of approval. Property-secured overdrafts are the slow lane everywhere, because valuation and legal work enter the process and push settlement into weeks.
| Route | Decision | Access to funds | The dependency |
|---|---|---|---|
| Existing customer, bank digital product | Instant for eligible applicants (CommBank NetBank, NAB QuickBiz) | Minutes to same business day | Being an existing customer with clean conduct and an eligible structure |
| New applicant, bank digital product | Minutes for an initial decision; around 2 business days to full approval (ANZ GoBiz published timing) | On approval | Connecting accounting software or bank data; meeting the 6 to 12 month trading floor |
| Non-bank, statement-based file | Hours for limits in the statement-assessed band | Commonly 24 to 48 hours from approval | Six months of clean bank statements and a complete application at lodgement |
| Property-secured overdraft | Days to weeks | At settlement, after valuation and documentation | Valuation turnaround and legal work on the security |
From the broker desk
Indicative only, from Switchboard broking files during 2026: statement-based non-bank overdraft files that arrive complete, meaning six months of statements for every business account, identification, and a clear stated limit, have run from lodgement to approval inside a business day, and the fastest approval-to-settlement we have seen on a six-figure facility was two days. Files that trickle documents in take a week or more for the same outcome. The variable is almost never the lender's speed; it is whether the file is complete on day one.
Timeframes are observations from specific files, not a promise about any application. Assessment outcomes and timing vary with lender workload, file quality and credit profile.
The speed claims worth distrusting are the ones with no dependency attached. Every fast lane above has a condition: existing relationship, clean data connection, or a complete statement file. A business that cannot meet any of them should plan on the slow tier regardless of what any lender advertises.
Go deeper
The hour-by-hour anatomy of a same-day file and what breaks it: the fast and same-day business overdraft guide.
Business overdraft vs line of credit vs working capital loan
The three products answer the same cashflow problem with different structures. An overdraft is attached to the transaction account and revolves automatically as deposits land. A business line of credit is a standalone revolving facility drawn on request, usually not tied to the operating account. A working capital loan is a lump sum with a fixed term and scheduled repayments. The overdraft wins on frictionless access, the line of credit on separation from daily banking, and the term loan on cost certainty for a defined, one-off need.
| Feature | Business overdraft | Line of credit | Working capital loan |
|---|---|---|---|
| Structure | Limit on the transaction account; balance revolves automatically | Standalone revolving facility; drawn and repaid on request | Lump sum, fixed term, amortising repayments |
| Interest basis | Charged on the debit balance while overdrawn | Charged on the drawn balance | Charged on the full advanced amount |
| Ongoing cost while unused | Line or annual fee on the facility | Line or annual fee on the facility | None once repaid; the cost is the fixed repayment schedule |
| Best structural fit | Recurring timing gaps in the operating account | Irregular, larger draws kept apart from daily banking | A single defined need with a known payback horizon |
Is a business overdraft cheaper than a business credit card?
Usually, for cash. Overdraft rates on the used balance generally undercut business credit card cash advance rates, and cards charge interest on cash from day one with no interest-free period. Cards win on interest-free days for purchases paid in full each cycle and on rewards; the overdraft wins the moment a balance actually revolves. Running working capital on a card is the most expensive common version of this product category.
For a deeper treatment of the standalone facility, the line of credit guide covers sizing, pricing and structure on that product, and the working capital page covers the term-loan route. The honest deciding question is usage shape: constant small oscillation around zero suits the overdraft, lumpy occasional needs suit the line of credit, and one big planned outlay suits the term loan, and the overdraft vs line of credit guide runs that decision in full, by how your balance actually moves.
When the bank changes the rules: reviews, limit cuts and recalls
Most bank business overdrafts are repayable on demand and subject to periodic review, which means the bank can reduce the limit, decline a renewal, reprice the facility or require repayment within the terms of the contract. A limit cut or recall is a credit decision about the bank's appetite, and it arrives with contractual notice, review conditions and practical options that deserve their own treatment rather than a summary here.
If the limit has been cut rather than the whole facility recalled, the reduced overdraft limit guide covers what the notice means, a drawn balance above the new limit, payment triage and replacement timing in the first 48 hours. If the facility itself has been recalled, the dedicated guide covers the timeline, your rights under the Banking Code, and the refinance routes in full: Bank recalled your business loan or overdraft? What to do. What a lender re-checks at review, and what to fix in the sixty days before it, is covered in the sixty days before your overdraft facility review. If the facility is intact but the bank has refused an increase or failed an annual review, the eligibility ladder and non-bank routes above are the constructive path, and the eligibility check takes minutes without a credit enquiry.
How a broker panel changes the outcome
Every lender page on this topic can only describe its own product, which is why the published numbers had to be assembled from a dozen sources to build the tables above. A broker holds the assembled version as a working tool: which lender's credit model suits a given turnover band, which one prices property ownership into an unsecured file, which one declines a sector outright, and which one is actually writing files this month at the advertised speed.
The application mechanics differ too. Serial direct applications leave a trail of credit enquiries, and each declined application makes the next assessment harder. A brokered file is matched before it is lodged: one application, placed with the lender whose published and unpublished settings it actually fits. For the borrower the cost structure is disclosed upfront, and for facilities like these the broker is typically remunerated by the lender on settlement.
Applying serially
Pick a lender from advertising, apply, wear the enquiry, get the real (not advertised) terms at the end of assessment, and repeat if declined. Each round costs weeks and marks the file.
Applying matched
The file is read first, matched against the panel's actual settings, and lodged once where it fits. The advertised-versus-actual gap is known before the enquiry is made.
What is a business overdraft in Australia?
A business overdraft is a revolving line of credit attached to a business transaction account. It lets the account balance go below zero up to an approved limit, so payments clear during the gap between outgoings and revenue. Interest is charged on the overdrawn balance while the account is in debit, and every deposit into the account automatically reduces what is owed. It is credit for timing, not for capital: the structure suits the gap between paying suppliers and being paid, and suits long-term investment poorly.
The facility is regulated business credit: overdrafts for business purposes sit outside the consumer credit protections that apply to personal lending, which is one reason contract terms like repayment on demand and periodic review carry real weight and are worth reading before signing.
How does a business overdraft work day to day?
The lender approves a limit on the transaction account. Payments can take the account into debit up to that limit; deposits repay it automatically; the available balance revolves continuously. There are generally no fixed repayments while the balance stays inside the limit, though some non-bank structures amortise the drawn balance on a weekly schedule instead, which repays principal steadily rather than leaving the facility evergreen.
Exceeding the limit is where the product bites. An excess drawing can be declined, honoured at a penalty rate, or treated as a default event depending on the contract, and honoured excesses commonly attract both a fee and a higher excess drawing rate. An account that lives at its limit also reads badly at review time, because conduct inside the facility is the lender's main ongoing signal.
What is an unapproved or unarranged business overdraft?
An unarranged overdraft is the account going into debit without an approved facility, or beyond the approved limit, and the bank choosing to honour the payment anyway. It is the most expensive credit most businesses ever use: honoured excesses commonly attract a fee plus a penalty-tier excess drawing rate, and repeated unarranged debits read as distress at any future assessment. A business relying on unarranged overdrawing has an unpriced facility that should be formalised.
How do you clear, reduce or convert a business overdraft?
A balance that no longer clears to credit is the signal to restructure. The standard moves are stepping the limit down over agreed months, converting the hardcore balance to a term loan with scheduled principal so the debt actually amortises, or refinancing to a structure that matches how the funds are really being used. Lenders will generally support a managed conversion, because a permanently drawn overdraft is a risk position for them too; the conversation goes better initiated by the borrower before review than imposed by the bank at it.
What can a business overdraft be used for, and how big should the limit be?
Typical uses are working capital in motion: paying suppliers and invoices ahead of receipts, covering wages across a slow fortnight, buying stock ahead of a seasonal peak, and absorbing the irregular timing of large customer payments. The product is a poor fit for buying long-life assets, where asset finance matches the term to the asset, and for funding sustained losses, where more credit defers rather than solves the problem.
Sizing runs off the cashflow gap, not ambition. A workable rule is to map the largest cumulative shortfall between outgoings and receipts across a typical cycle, add headroom of a quarter to a third, and resist paying holding fees on limit beyond that. An oversized facility costs real money in line or annual fees on the unused portion, and a maxed-out one damages the conduct picture at review; the target is a limit the balance moves freely inside.
Is a business overdraft good for cashflow, and when is another product better?
For recurring timing gaps in an otherwise sound business, an overdraft is one of the cleanest tools available: it costs interest only when used, requires no drawdown process, and self-repays as revenue lands. It stops being the right tool when the balance never returns to credit, which signals a capital shortfall being financed on revolving terms, or when the need is a single large outlay, where a term loan prices better.
The alternatives map to the shape of the need: a line of credit for irregular larger draws, a working capital loan for a defined one-off gap, invoice finance where receivables are the asset, and property-backed lending where the amount required outruns unsecured limits entirely. The comparison table earlier on this page sets the three main structures side by side.
What legal protections apply to business overdrafts?
Business overdrafts sit outside consumer credit law, but they are not unregulated. Banks that subscribe to the Banking Code of Practice owe code obligations to small business customers, including conduct standards around facility changes and enforcement. Unfair contract terms law applies to standard-form small business contracts, and lenders enforcing security must follow the processes registered against it. The practical protection, though, is contractual literacy: knowing whether the facility is repayable on demand, what the review clause says, and what constitutes default is worth more than any remedy after the fact. The recalled facility guide covers rights and process in depth for when the relationship turns.
Frequently asked questions
It is a good idea for recurring cashflow timing gaps in a profitable business, because interest applies only to the used balance and the facility self-repays as revenue lands. It is a poor idea for funding sustained losses or long-term assets, and an oversized limit costs holding fees for no benefit.
Published business overdraft rates currently run from 8.75% p.a. for secured facilities to 24.95% p.a. at the top of the published non-bank band. See the business overdraft rates and fees comparison for the full lender and fee breakdown.
Advertised unsecured bank limits run from $2,000 to $250,000 depending on the bank, and non-bank facilities are published to $2 million. Lending without property security typically caps around $100,000 to $150,000, and limits above roughly $500,000 generally require full financial statements.
No. Every major bank advertises an unsecured option, and non-bank lenders assess statement-based facilities on business revenue alone up to roughly $100,000 to $150,000. Unsecured still normally involves a director personal guarantee, and larger limits commonly add a registered security over business assets.
Eligible existing bank customers can see instant decisions with same-day access. New applicants on bank digital products run to around two business days for full approval. Non-bank statement-based files publish decisions in hours with funding commonly 24 to 48 hours after approval. Property-secured facilities take weeks.
Yes. NAB, CommBank, Westpac and ANZ all list sole traders as eligible, subject to trading time and turnover requirements, and non-bank lenders assess sole traders on the same bank statement basis as companies. The personal guarantee falls directly on the individual.
Bank digital products typically need only the online application plus account or accounting data. Non-bank statement-based files typically need a completed application, six months of statements for every business account, and director identification, with financial statements and the ATO position entering above roughly $500,000.
They solve different problems. An overdraft suits recurring timing gaps because it revolves and charges interest only while drawn. A term loan suits a single defined need because it prices lower and repays on a fixed schedule. Matching the structure to the shape of the need matters more than either product's headline rate.
An overdraft suits constant small movement around zero in the operating account, because it revolves automatically. A line of credit suits larger, irregular draws kept separate from daily banking. Costs are similar in structure, so the deciding factor is how the funding need actually behaves month to month.
Banks reduce limits at review when conduct, sector appetite or the wider credit environment changes, and most business overdrafts are contractually repayable on demand. If this has happened to you, the reduced overdraft limit guide covers the notice, an over-limit balance and your first 48 hours, and the recalled facility guide covers the escalation.
