After you click the Save As Recurring button from the invoice dialog of the web interface, you will be asked to select a schedule of the invoice.

Start Date

Select the date when the recurring invoice will start.

Interval

Select the interval of the recurring invoice. Choose from weekly, fortnightly, monthly, bimonthly, quarterly, 6 months, annually, or every 2 years for the interval.

Replace the string %period% in any description with dates.

If you want to have the recurring date in the description, enabling this option will replace the text "%period" to the recurring date.

Update the prices of any items which have been changed.

Enable this option to allow the prices of any items which have been changed.

Automatically charge the customer by credit card.

Enable this option to automatically charge the customer via credit card.