To write a convincing proposal, you must end your letter on a strong note. You want to leave the reader with a positive impression of you and your proposal. Moreover, you want to incite the reader to act upon your proposal, either by awarding you the bid or contacting you for more information. Thus, the conclusion of your proposal should be just as strong as the introduction, and the verbiage you use can compel the reader to respond.
Briefly summarize the main points of your proposal. Keep this content to a sentence or two. Mention the problem that you identified in your proposal as well as your solution. Include any convincing facts and figures in these sentences. For example, if you can save the client $25,000 a year with your proposal, remind him of that.
Identify the benefits of your proposal in two to three sentences. Offer tangible benefits if possible. Discuss ways your proposal will save money, increase profits, increase sales or increase visibility. Don't make the reader dig to figure out why he should choose your proposal—make your benefits clear so that you are the obvious choice.
Include a call to action. Challenge the reader to contact you to move past the proposal stage. Tell him when you are available to discuss the proposal—provide a specific date. If you're submitting the proposal on behalf of an organization, invite the reader to visit your offices to learn more about the company.
Establish ongoing communication in your conclusion. Provide your contact information, particularly a phone number and email address, where your reader can reach you. Tell your reader that you will contact him by a certain date to discuss the status of the proposal. Make sure that date aligns the proposal deadline date; don't contact the reader too early, when he is still collecting proposals.