What is included in an offer letter? An offer letter focuses on the key details of employment.Are offer letters binding in any way in California? However, when I started, my boss told me the remote work policy was a mistake. Enter the salary amount being offered to the employee. The salary may be entered as an annual, monthly or hourly basis. Offer letters should at least address the following items: Terms of employment. The employee's at-will status. California Labor Code Section 432.3 prohibits employers from asking job applicants about their salary histories. What should an offer letter include?