Monthly billing in My Account:
- In My Account, select your name in the top right corner, then 'Account Settings'
- In the 'Billing and payments' menu, go to 'Monthly billing' and select 'Edit'
- Select your account, then choose your preferred bill issue date
- Select 'Switch To Monthly Billing' to complete.
From here, you can also cancel monthly billing.
Monthly billing in the AGL app:
- Go to the Account tab, Settings, then Monthly Billing.