When you bill for recurring service, eg landscaping, include the dates of service on your invoice and provide one bill per month for the services performed for the previous month . 

Do not include dates of service for more than one month on one invoice 

eg If you did service on April 25th, May 10th and May 29th, give us one bill for April (to include April 25th service) and one for May (to include May 10th and May 29th service)