When will I receive an invoice?

You will be invoiced monthly, on the day that you activated your first user. Payment will be deducted automatically from your credit card.

When you create an additional user, you will only be billed for the days it was active during this billing period.

Example:

You activated your first user on January 5th, then you will receive an invoice each month on the 5th. The invoice will cover the number of active users you had during the past month.

Related articles:

Do I need a credit card to sign up for Office 365 Plus
When do I pay for a user?