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.
Body: The body of the letter has three parts: an introduction that should explain who you are and why you are writing, a middle part that gives the details and persuades your reader to act, and a closing that tells your reader what action you expect or would like them to take. Valediction: (Left_aligned, two lines below the body) This is the line before your signature. For people whose name you don’t know, use “Faithfully yours” _ but avoid writing letters without finding out a name first.