Employment Offer Letter Instructions. Customer: Who should sign an offer letter first?The employer or employee? Is there anything I need to know, from a legal standpoint, if I were to back out of the signed job offer now? I am in California for reference. I am writing to confirm my acceptance of your employment offer on April 20 and to tell you how delighted I am to be joining XYZ Corporation in Chicago. And if they refuse at first, they will often accept if you offer to pay the first few months of rent in advance. Normally the employer will ask for you to sign to accept their offer. That then becomes binding. Never ever submit any original documents like marksheets, certificates etc.