Understanding Account Overdrafts and ATM Access

Managing account balances and overdraft facilities

Olesya Krasavtseva
Fact-checked by Olesya Krasavtseva
Content Editor at Prostobank Consulting Prostobank Consulting Logo
Updated: 01.09.2026
Table of Contents

How Overdrawing Works at an ATM

Overdrawing your account at an ATM is not a feature you can trigger without an active overdraft facility. Generally, if you attempt to withdraw more money than you have available in your account, the transaction will be declined by the ATM. To access funds beyond your available balance, you must have the bank's "Overdraw" feature enabled on your eligible transaction account, such as a Smart Access or Complete Access account.

The Overdraw feature acts as a safety net, allowing specific payment types to proceed even if your account balance is insufficient. However, it is designed for occasional use rather than as a primary source of credit. Relying on this feature can incur fees and interest, so it is helpful to monitor your account balance regularly through the CommBank app to avoid unexpected costs.

Key Account Overdraft Information

Category Details
Methods ATM withdrawals, EFTPOS, and scheduled payments.
Processing Time Immediate authorization if the Overdraw feature is enabled.
Eligibility Customers aged 18+ with eligible transaction accounts.
Key Requirements Overdraw feature enabled via NetBank or CommBank app.

Step-by-Step Guide to Managing Overdraw Settings

You can manage your overdrawing preferences to control whether your account allows transactions to exceed your balance.

  1. Log in to the CommBank app or NetBank using your client number and password.
  2. Navigate to the account dashboard and select the specific transaction account you wish to manage.
  3. Select the 'Manage' option, then locate 'Overdraw preferences'.
  4. Review your current settings and choose to enable or disable the overdraw feature based on your financial needs.
  5. Confirm your changes to save your preferences.

Troubleshooting Common Issues

MFA / Login Issues

If you cannot access your settings because you are not receiving your security code, this is often caused by mobile network congestion. A simple fix is to toggle your phone’s airplane mode to reset your connection to your provider. If the code still fails to arrive, contact the bank to verify that your mobile number on file is current.

Browser or App Errors

Sometimes the settings menu may fail to load or display an error message. This usually happens when the application cache is cluttered or the app requires an update. Try clearing your device’s cache or updating the software through your app store. If the problem continues, log in via a desktop browser as a reliable alternative.

Locked Account / ID Issues

Entering your login details incorrectly multiple times will trigger a security lock to protect your account. You cannot resolve this through self-service if your access is suspended. The fallback action is to call the bank's support team or visit a branch, as they must manually verify your identity before they can restore your access.

Pro-Tip: Set up low-balance alerts in the CommBank app. This allows you to receive a notification before your balance hits zero, helping you manage your spending proactively and avoid the fees associated with overdrawing your account.

Frequently Asked Questions

Why was my ATM withdrawal declined even though I have an overdraft?

An ATM withdrawal may be declined if you have reached your daily withdrawal limit or if the specific ATM network does not support your account type's overdraft linkage. The system checks two things: your available funds and your overdraft limit. If the total exceeds the allowed daily limit, the transaction will be blocked regardless of your available overdraft. Your next step should be to check your daily transaction limit in the CommBank app settings.

What is the CBA Osko offer, and how does it relate to my overdraw settings?

Osko is not an "offer," a promotion, or a service you need to sign up for. It is the brand name for the payment infrastructure (the New Payments Platform) that enables near real-time transfers between Australian bank accounts, 24/7. Osko is standard technology integrated into your account and is completely independent of your overdraw settings. If you make a transfer using Osko, the system checks your available funds, and if your overdraw feature is on, it may allow the payment to proceed into a negative balance. You do not need to activate Osko—it works automatically when you make transfers.

Official Bank Information

Commonwealth Bank (CBA)

Support: 13 22 21

SWIFT Code: CTBAAU2S

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