When writing a job offer rejection letter, you must be clear about your purpose and honest to tell them your reason for declining. 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.1. Let your employer know as soon as possible. Minnesota has long required that an employer provide written notice of basic terms of employment to newly hired employees. Keep your jobdeclining letter short and get straight to the point. If a former employer is giving out false or misleading information about you, it could doom your job search.