Need help drafting a job offer letter? The first thing you should put on your job acceptance letter is the date.Include it underneath the header close to the top of your letter. This letter serves as an offer of employment to you for the University Support Personnel System position. Read on to learn why and how to write an employee offer letter. I accept the position of (TITLE), effective (DATE). Employment Offer Letter Instructions. It's a good idea to send an offer letter even when you are offering a job to someone that already works for your company. Include a space where the potential employee can sign and date the letter to signify their acceptance.