How To Write A Business Letter For Company . The date should be the day on which you completed the letter, written in the standard us “month, date, year” format (e.g., october 28, 2017). Follow these steps to format a professional business letter: businesslettertemplate180 Business letter format, Business letter from www.pinterest.com State your intent in the letter’s body text. Using an official business letter can alert the recipient that the content is serious and demands attention or action. Name, contact information, address, etc.).