How To Write A Business Contract Letter . Contents of a business agreement letter. Be sure to also state the start date of the contract and when it expires. 9+ Business Agreement Letter Examples PDF, DOC Examples from www.examples.com The following points should be included in the letter: You want the prospective employee to feel appreciated and honored, so make it clear that they were specifically selected for the position because they stood out as the best fit. Be sure to also state the start date of the contract and when it expires.