Business Letter Writing Guidelines. Here are guidelines for writing a business letter, so all your correspondence makes the best impression. Margins: Business letter margins should be about 1" all around. This gives your professional letter an uncluttered look. You should align your text to the left; this is how most documents are aligned, so it will make your letter readable. Letter Spacing: Leaving space in your letter creates a clear, uncluttered and easy to read look that the reader will appreciate. Your letter should be in block format: the entire letter should be aligned to the left and single_spaced except for a double space between paragraphs.
Contact Information: The first section of your letter should include your contact information and the contact information of the person you are writing, too. Also, include the date you are writing at the top of your letter. Letter Salutation: Unless you know the reader well and typically address them by their first name, you should include the person's personal title and full name in the salutation (i.e., "Dear Mr. James Franklin"). If you are unsure of the reader's name, include his or her title (i.e., "Dear Executive of Marketing"). If you are unsure of the reader's gender, simply state their full name and avoid the personal title (i.e., "Dear Jamie Smith"). If you are unsure of the reader's gender, name, and title, simply write, "To Whom It May Concern." Leave one line blank after the salutation.