Overdraft Facility: How a Revolving Credit Line on Your Bank Account Works
An overdraft facility is a revolving credit arrangement linked to a bank account that allows you to withdraw or spend more money than your account balance holds, up to a pre-approved limit, with interest charged only on the amount actually overdrawn.
Not financial advice. All figures for educational reference only. Data as at July 2026. Last updated: July 2026.
Key Takeaways
- Overdraft facilities in Singapore are offered by major banks (DBS, OCBC, UOB, Standard Chartered) as either secured (against deposits or investments) or unsecured credit lines.
- Interest is charged only on the drawn-down amount and only for the days it remains outstanding, unlike a term loan where interest accrues on the full principal.
- Unsecured overdraft interest rates in Singapore commonly range from about 12% to 20% p.a. effective interest rate (EIR), while secured overdrafts (backed by fixed deposits or investments) are typically much lower.
- Most personal overdrafts require a minimum income (often S$30,000–S$120,000 per year depending on the bank) and are subject to the Monetary Authority of Singapore’s unsecured credit rules capping borrowing relative to income.
- An overdraft is best suited for short-term cash flow gaps, not as a substitute for a personal loan or long-term financing.
What Is an Overdraft Facility?
An overdraft facility turns a current or savings account into a flexible credit line: instead of a fixed loan amount disbursed upfront, the bank pre-approves a maximum limit you can dip into whenever needed. You only pay interest on what you actually use, for as long as you use it — if your account stays in credit, no interest is charged at all.
This makes overdrafts fundamentally different from term loans and most credit cards. A term loan disburses the full amount upfront and charges interest on the full principal from day one (even if you don’t need all the funds immediately), while a credit card is built around purchase transactions rather than direct cash withdrawal against your bank balance.
In Singapore, overdrafts are offered to both individuals and businesses. Personal overdrafts are usually used for short-term cash flow smoothing, while business overdrafts help companies manage working capital gaps between paying suppliers and collecting receivables.
How Does an Overdraft Facility Work in Singapore?
Singapore banks offer two broad types of overdraft: secured and unsecured.
| Type | How It’s Backed | Typical Interest Rate (p.a.) |
|---|---|---|
| Secured overdraft | Fixed deposit, unit trust, or other collateral pledged to the bank | Roughly 1–3 percentage points above the pledged asset’s rate |
| Unsecured overdraft | No collateral — based on income and credit assessment | Approximately 12%–20% effective interest rate |
Unsecured overdrafts are subject to the same industry-wide unsecured credit rules that apply to credit cards: MAS guidelines cap total unsecured borrowing (overdrafts, credit cards, and unsecured lines combined) at a multiple of your monthly income, with earlier repayment expected once outstanding unsecured debt crosses certain thresholds relative to your annual income.
Interest is calculated daily on the outstanding overdrawn balance and is usually billed monthly. There is typically no fixed repayment schedule — you can pay down the overdrawn balance at any time, and as long as you stay within your approved limit, you can draw down again without reapplying.
Source: Monetary Authority of Singapore (MAS) unsecured credit guidelines; individual bank overdraft facility terms, 2026.
Overdraft Facility Example
A freelancer is approved for a S$10,000 unsecured overdraft facility on her current account, at an effective interest rate of 15% p.a. In a month where a client payment is delayed, her account balance dips to −S$3,000 for 10 days before the payment arrives and restores her balance to positive.
Interest is charged only on the S$3,000 drawn, only for the 10 days it was outstanding: roughly S$3,000 × 15% × (10/365) ≈ S$12.30. Once the client payment clears and her balance returns above zero, interest charges stop entirely — she pays nothing for the months she doesn’t dip into the overdraft.
Compare this to taking a S$10,000 term loan instead: interest would typically accrue on some or all of the S$10,000 principal from disbursement, regardless of whether she actually needed the full amount or only a fraction of it for 10 days.
Advantages of an Overdraft Facility
Pay interest only on what you use. Unlike a term loan, there’s no interest cost on unused portions of your approved limit.
Flexible, revolving access. Once approved, you can draw down and repay repeatedly without reapplying each time, as long as you stay within the limit.
No fixed monthly instalment. There’s flexibility in how and when you repay the overdrawn amount, useful for managing irregular income or lumpy cash flows.
Lower rates available if secured. Pledging a fixed deposit or investment portfolio can bring the interest rate down significantly compared to unsecured borrowing.
Risks and Limitations
High rates if unsecured. At 12%–20% p.a. effective interest, an unsecured overdraft is considerably more expensive than a mortgage or even many personal loans if left outstanding for long periods.
Easy to treat as “extra income.” Because the funds are readily accessible, it’s easy to slip into using an overdraft as ongoing spending money rather than a short-term buffer.
Bank can review or reduce the limit. Overdraft limits are typically reviewed periodically and can be reduced or withdrawn if your financial profile changes.
MAS unsecured credit caps apply. If your total unsecured borrowing (overdraft plus credit cards plus other unsecured lines) grows too large relative to income, you may be required to make accelerated repayments under MAS rules.
The Bottom Line
For Singapore consumers and small businesses, an overdraft facility is a useful shock absorber for short, unpredictable cash flow gaps — but its cost structure only makes sense if the overdrawn balance is cleared quickly; left outstanding for months, it becomes one of the more expensive ways to borrow.
Frequently Asked Questions
What is an overdraft facility?
It’s a revolving credit line linked to your bank account that lets you withdraw more than your balance holds, up to an approved limit, with interest charged only on the amount and days you’re overdrawn.
How much interest does an overdraft charge in Singapore?
Unsecured overdrafts typically charge an effective interest rate of about 12% to 20% per annum, while secured overdrafts backed by a fixed deposit or investment are usually much lower.
Do I need to repay my overdraft on a fixed schedule?
No. Most overdraft facilities have no fixed instalment schedule — you can repay the overdrawn amount whenever funds are available, as long as you stay within your approved limit.
Is an overdraft better than a personal loan?
It depends on the use case. An overdraft suits short, irregular cash flow gaps since you only pay for what you use, while a personal loan is usually cheaper for a known, larger amount borrowed over a fixed period.
Can my bank reduce or cancel my overdraft limit?
Yes. Overdraft facilities are typically reviewed periodically, and the bank can reduce, freeze, or withdraw the facility if your financial circumstances or credit profile change.