In this article, we discuss how to write a business proposal letter and we offer sample letters and templates you can use as a guide. TAB B Proposal Summary and Project Narrative.The proposal should always include specific elements, including the timeframe and costs associated with the work you can do for your potential client. Fill out the form below to ask any questions you may have about how we can help your business start, operate, and grow. 1. Cover letter Briefly describe your organization and its mission. Loosely explain your plans and how the grant will fit in. Forms ; Summons extra caption. PDF ; Complaint sample. The completed typewritten form must be filled out correctly prior to emailing your request. Incorrectly filled forms will be rejected.