Congratulations on this new opportunity. Important information that should be in an internship offer letter.The internship offer letter should include the start and end dates of the internship, as well as the number of working hours per week. Use an Internship Offer Letter form to offer an internship to a successful candidate. This template provides an overview of the most essential details to include in a paid internship offer letter. On behalf of the company, I welcome you to Friendly Green. DO be as precise and straightforward as possible in the offer letter. An internship offer letter is a letter that informs the candidate that they have been selected for the mentioned internship position at your organization. The supervisor's name, title, and email address should be included in the letter. This is an official document that goes out to a candidate when they have been selected for an internship at your company.