Contracts and billing cycles How to edit the billing cycle of an existing contract. Cycle billing is the practice of invoicing different customers based on a schedule rather than billing all accounts at once. Setting the billing cycle If the side menu is not visible, click . In the side menu, click Finance. Under the Invoicing section, click Contracts. Click the name of the customer to view their contract. Under "Invoice period, you can set the billing cycle below ...and then on the (blank)th every 1 month. Click Save. Have more questions? Submit a request Comments Please sign in to leave a comment.