Dear (Mr./Mrs./Miss/Ms.) followed by last name:
In the opening sentence of your agreement letter, state the purpose and explain that the letter is to outline the scope of services or conditions.
Next, you want to include details about the service to be rendered. Here you want to include the full name of the person agreeing to do the work/service, exact details about what is to be completed and any information or items that will be provided by yourself or the company in completing the service.
Also include the rate of pay if the agreement letter is for work/services, and how long you expect the project will take. Include details regarding pay in case the recipient completes work/services in a shorter time period than expected. For example, if you project that the work will take 25 hours to complete and John P. Smith finishes in 20 hours, state whether he will be paid for 20 hours or for the full 25.
Go on to include details regarding your timeline, terms of payment and any additional costs. Remember to use full names, exact dollar amounts and all pertinent details.
City, State, Zip
Be absolutely certain that both parties sign and date the agreement letter. Before mailing or delivering, proofread your letter to ensure that all details are correct. Also check for spelling and grammar errors, since this is a formal document.
Writing an agreement letter may seem a bit intimidating, but the guidelines above will make the process easier.