Rejecting a job offer requires careful planning and the right approach. Make Your Decision QuicklyTime is very important when rejecting job offers. Choose the Right Way to CommunicateEmail is usually the best way to reject a job offer. Give a Brief Reason (Optional)You don't have to explain why you're rejecting the offer, but giving a short reason can be helpful. You might say you accepted another offer, decided to stay at your current job, or found the position doesn't match your career goals.