Cash flow buffer
Business overdrafts, explained.
Key takeaways
- Sits on your everyday transaction account. No separate account number.
- Interest only on the negative balance, calculated daily. Not on the full limit.
- Typically 14 to 20% p.a., depending on lender tier and whether the limit is secured (backed by an asset the lender can claim if repayments stop).
- Built for short, recurring cash flow gaps. Larger, planned needs suit a term loan.
What Is a Business Overdraft?
A business overdraft is an agreed limit attached directly to your everyday transaction account, letting the account balance run negative up to that limit without a payment bouncing or being refused. There's no separate loan account, no drawdown request, and no fixed repayment date - the account simply moves into and out of overdraft as money comes in and goes out.
Interest accrues only on the negative balance, calculated daily and typically debited to the account monthly. If your account sits at $0 for three weeks and then dips to $12,000 negative for four days before a payment lands, you pay interest on that $12,000 for four days - not on your $40,000 limit for the whole month. That daily-balance mechanic is the single most misunderstood part of how an overdraft actually costs money, and it's the reason an overdraft can be a genuinely cheap way to smooth short cash flow gaps despite carrying a headline rate above a secured term loan.
Overdraft vs. Line of Credit vs. Term Loan
| Dimension | Overdraft | Line of Credit | Term Loan |
|---|---|---|---|
| Attachment | On your transaction account - no separate account number | Standalone revolving facility, own account | Standalone facility, disbursed as a lump sum |
| Interest Basis | Daily balance - only on the negative amount, on the days it's negative | Daily balance on funds drawn | Amortised across the full principal from day one |
| Typical Use | Recurring, short cash flow gaps - days to a few weeks at a time | Ongoing working capital, larger and longer draws | A single, planned funding need |
Rate Benchmarks by Lender Tier (2026)
| Lender Tier | Rate Range (p.a.) |
|---|---|
| Major Banks | From about 11% |
| Second-Tier Banks | 14% to 15% |
| Fintech Lenders | 14% to 20% |
| Specialist Non-Bank | 14% to 18% |
| Private Lenders | 16% to 20% |
Indicative market ranges, not quotes. Your Compare Report shows the options you qualify for across our panel.
What a $40,000 Overdraft Actually Costs
Most business owners assume an overdraft limit gets charged like a loan for the full amount, all month. It doesn't. Worked example: a $40,000 limit, used for an average of 12 days a month, at a typical second-tier rate of 14.5% p.a.
IF CHARGED ON THE FULL LIMIT
$483.33/mo
$40,000 × 14.5% ÷ 12
This is not how it works
Common misconception only
ACTUAL DAILY-BALANCE COST
$190.68/mo
$40,000 × 14.5% ÷ 365 × 12 days
Total cost: $190.68
Charged only on days drawn
The real monthly cost is roughly 60% lower than the "full limit" assumption - because interest only accrues on the balance and days actually used.
See what limit you'd actually qualify for.
See My OptionsHow Much Can You Borrow?
Overdraft limits are sized against how the account actually behaves, rather than a stated funding need alone. Lenders weigh six factors:
- Average Account Turnover
- Monthly deposits and withdrawals through the account set the ceiling more than annual revenue alone.
- Security Offered
- Property or asset backing lifts the limit well beyond the unsecured band.
- Banking Relationship Length
- An established transaction account history with the lender streamlines the assessment and can raise the limit.
- Cash Flow Seasonality
- Predictable seasonal dips support a case for a larger buffer than flat, steady trading.
- Existing Facilities
- Other drawn facilities reduce serviceability (your ability to repay based on cash flow), and so the limit a lender will extend.
- Credit Score
- A clean file opens the bank tier; defaults or late payments narrow options to non-bank lenders.
| Security Type | Typical Limit | Basis |
|---|---|---|
| Unsecured | Up to $100,000 | 1 to 2 months' average account turnover |
| Asset-Backed | Up to $500,000 | Value tied to the asset offered as security |
| Property-Backed | $1M+ | Depends on the loan-to-value ratio (loan size against property value) |
Eligibility & Documents
Minimum eligibility varies by lender type, but most panels apply a similar baseline:
- Time Trading
- 6+ months for non-bank; 12+ months typical for bank lenders.
- Annual Revenue
- $60,000+ typical minimum, assessed against account turnover.
- Credit File
- No active defaults for bank tier; non-bank options exist otherwise.
- Business Structure
- Company, trust, or sole trader; ABN active 6+ months.
| Document | Fintech / Non-Bank | Banks |
|---|---|---|
| Bank statements | 3 to 6 months | 6 to 12 months |
| Financial statements | Not always required | Required (2 years) |
| Tax returns | Rarely required | Required (2 years) |
| Identification | Director ID + licence | Director ID + licence |
Evaluating an Overdraft on Security, Term, Amount and Rate
- Security
- Unsecured limits available up to roughly $100k; larger limits available against property or business assets.
- Term
- Ongoing facility reviewed annually rather than repaid over a fixed schedule - stays open while the relationship stays healthy.
- Amount
- Limit sized against verified account turnover and seasonal cash flow pattern, not a single point-in-time figure.
- Rate
- Full transparency on the daily-balance interest rate, any annual line fee, and how the limit gets reviewed.
Pros & Cons of a Business Overdraft
ADVANTAGES
- Interest charged only on what you actually draw, only for the days you draw it
- No separate account or drawdown paperwork - funds are already where you bank
- Reusable indefinitely once repaid, unlike a lump-sum loan
- Simple to arrange against an existing banking relationship
DISADVANTAGES
- Limit can be reduced or recalled at annual review
- Not designed for large, one-off funding needs
- Director guarantees (the director personally backs the debt) typically required
Business Overdraft vs. Other Finance Products
| Overdraft | Line of Credit | Term Loan | Invoice Finance | |
|---|---|---|---|---|
| How It Works | Buffer attached to bank account | Revolving limit, draw as needed | Lump sum, fixed schedule | Advance against unpaid invoices |
| Best For | Short-term cash flow gaps | Ongoing working capital | One-off funding need | Bridging receivables timing |
| Typical Rates | 14% to 20% p.a. | 14% to 25% p.a. | 9.9% to 48% p.a. | 1% to 3% per invoice |
| Repayment Structure | Repaid as funds are deposited | Interest on drawn balance only | Fixed instalments over term | Repaid when invoice is collected |
Frequently Asked Questions
Do I need a new bank account to get an overdraft?
Not necessarily. Many lenders will attach an overdraft to your existing transaction account, particularly if you already bank with them. Switching or opening a new account is sometimes required if you're moving to a different lender for a better rate.
Is interest charged on the full limit or just what I use?
Just what you use. Interest accrues daily on the negative balance only, for the days the account is actually in overdraft - not on the limit itself. An unused limit costs nothing beyond any annual line fee the lender charges.
Can I get an overdraft with a non-bank lender?
Yes. Fintech and specialist non-bank lenders offer overdraft-style facilities, typically at a higher rate than the major banks but with a shorter assessment and less emphasis on an existing banking relationship.
What happens if I exceed my overdraft limit?
Exceeding the limit usually triggers a higher penalty interest rate on the excess, and repeated breaches can lead to the lender reviewing or reducing the facility. It's treated differently to simply using the limit as agreed.
Is an overdraft reviewed annually?
Most business overdrafts are reviewed annually, when the lender reassesses account turnover, conduct, and financial position before renewing, adjusting, or in rare cases withdrawing the limit.
How is an overdraft different to a line of credit?
An overdraft sits on your everyday transaction account with no separate account number. A line of credit is a standalone revolving facility with its own account, typically supporting larger and longer draws than an overdraft is designed for.
Can a new business get an overdraft?
It's harder, but not impossible. Most bank lenders want 12+ months of trading history; some non-bank lenders will consider a business with 6 months of consistent account turnover, particularly with director guarantees or additional security.
Will an overdraft affect my credit score?
Applying for an overdraft involves a credit check like any other facility, and the application can show as an enquiry on the director’s credit file. Using it within the limit and repaying as agreed doesn't damage your score; regular breaches or missed reviews can.
How we’re paid
You don’t pay to compare. Lenders pay us.
How do we get paid?
Comparing costs you nothing. Not comparing can cost you plenty.
The headline rate rarely tells the whole story. Fees, charges and loan terms can add far more to what you repay. That’s why your Compare Report shows every cost we can identify side by side.
In most cases, the lender pays us, and only if you decide to proceed with their product offer. For more complex deals, or where the lender pays us little or nothing, we may charge a fee for our service. It doesn’t happen often, but when it does, it’s shown on your Compare Report and we’ll walk you through it before you decide.
No obligation to proceed, ever.
See the overdraft options that fit your business.
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Or talk to us: 1300 161 641 · support@tradefunding.com.au