Learn how to write a letter for declining a job offer that you have already accepted and use our template and example as a guide. "I'm very sorry but something has just come up that prevents me from taking the position with your company that you offered me.Send the rejection letter as soon as possible. I'm sorry to say that your candidacy did not make it to the next round; we've had a very competitive pool for this position. Having a change of heart on a job? Saying "no" can be challenging. Giving a timely response is the most polite. The quicker you respond, the quicker the employer can fill the role. Turning down a job offer after you already accepted it should be done gracefully.