Giving a timely response is the most polite. The quicker you respond, the quicker the employer can fill the role.When writing a job offer rejection letter, you must be clear about your purpose and honest to tell them your reason for declining. Learn how to politely turn down a job offer with these tips and examples. Maintain a good relationship with the company while declining the offer. 1. Let your employer know as soon as possible. This blog post will teach you how to turn down a job offer with 15 examples and templates that will make declining a job offer an ease. Here's a sample letter to decline a job offer for your reference to politely say no to the company when you have made up your mind to join another. Unfortunately, I had accepted a position with another company before your offer came in. 1. Let your employer know as soon as possible.