Pro-rata is just another way of saying that we may only charge you for the days that you had access to the service.

For example, if your plan's monthly access fee is $100 (30 days) and you signed up half way through your billing cycle, we'll only charge you $50 (15 days).

Here's what pro-rata looks like on a bill.

You can see that the service started on 8th May and the plan cost $44 a month. The billing cycle ends on 14th May, so the customer was only charged $10.26 (7 days).

Note: We also charge one month in advance, which you can see on the bill above.

If you need more help understanding your bill, check out our bill explained article for useful info.

Pro-rata will come into effect when:

• Signing up to a new service with Optus
• Adding a new service to an existing account
• Moving to a lower plan (includes Postpaid Mobile & Mobile Broadband)
• Changing bill cycles
• Changing Ownerships
• Consolidating or deconsolidating accounts
  
  

Pro-rata won't come into effect when:

• Upgrading (moving to a higher plan)
• Moving to a plan with the same monthly access fee
• Relocating a Fixed service to a new address

Don't forget, you can view your bill in My Account or My Optus app.