Several websites offer customizable sample letters that are used to accompany Visa applications. Path2usa.com, Immihelp.com, AllLaw.com and Global Law Centers all have links to online sample invitation letters that can be sent to the U.S. Consulate in support of a visa applicant, according to their websites.
A visa letter of invitation can be written by a U.S. citizen or legal U.S. resident to help validate a friend, relative or business associate's application for a U.S. visa. The invitation letter is not a necessary part of the visa application process, but it can help to speed things along. The letter should be of a personal nature, not business-like, according to AllLaw.com. The letter writer should make his relationship to the applicant clear and outline the general plan for the applicant's stay in the United States. Some important details to include in the letter are the visitor's length of stay, where his planned accommodations are located, who is covering his expenses and what places he plans to visit during the trip. The details should be as specific as possible, and the letter should include the full addresses of both the letter writer and the visa applicant.
If financial support is being provided to the visa applicant, in lieu of a letter, an Affidavit of Support form can be filled out. This form can be downloaded from U.S. Citizenship and Immigration Services, according to its official website.