Write a short message explaining that you accept the offer and enclose a formal acceptance letter in the attachments. A sample letter offering a job contingent upon the results of a background check or other criteria.Review the offer letter. A sample letter offering a job contingent upon the results of a background check or other criteria. Usually I would accept a job offer the next day if it's given over the phone. I would say something like, "This sounds good. I'm writing to formally accept your employment offer for the Social Media Manager position at XYZ Company. How To Accept a Job Offer (With Steps, Example and Tips). indeed. You have 30 calendar days from receipt to accept or reject the attached offer of work. However, if you fail to respond in.