Parts of a Business Letter. The article before the number of the day is pronounced but not written. Official Business Letter Business Letter Format Business Letter Formal Business Letter So the presentation of all parts of a business letter is essential. A business letter has the following parts . A properly formatted business letter should have the following sections. In the body of the letter however the article is written when the name of the month is not mentioned with the day. Every part of the business letter has its importance. The heading and inside address start left justified but the salutation gets indented. The heading contains the return address the inside or recipients address the greeting the body the complimentary close and the signature line. Signature and Writers Identification. The Inside Address - In a business or formal letter you should give the address of the recipient after your own address. They are headings date salutation address the bod...