In this article, we explain what an enclosure is and how to cite one, and we provide an example of an enclosure in a business letter. Use this template to help write almost any formal business letter, using the standard block format.13. Enclosures. An enclosure can prevent a letter from becoming too detailed. Add an enclosure notation after your signature at the end of the letter, and abbreviate it with "Enc." or "Encl. Use an enclosure note whenever you enclose something. Type Enclosure(s) or Enc(s). The immediate objective of your application letter and accompanying resume is to attract this person's attention. Your ultimate goal is to obtain an interview. Perhaps because enclosure letters are so mundane, they have often been a target for the use of stilted and somewhat absurd lan- guage. All correspondence received in response to IRS solicitations for information necessary to secure or complete the processing of a tax return.