Tell them you appreciate their offer and are glad they picked you for the job. After that, mention that you will not take it and give them a reason. You don't have to go into much detail, but it's good for the employer to have a clue of why you declined their offer.
What do you include? Thank the company for the offer. Accept the position. Restate the terms of your contract. These may include salary, benefits, location and others. Restate any instructions given to you by the company. State your happiness at joining the company.
Acceptance Letter Format I am writing to confirm my acceptance of your employment offer from April 1. I am delighted to be joining International Engineering Corporation as a Project Manager. The work is exactly what I have prepared for and hoped to do.
Recipient's Name, I want to express my gratitude for the job opportunity of title that you extended to me at company name. By sending this email, I formally accept the offer. I am eagerly waiting to join on the expected start date of DD/MM/YYYY.
Thank you very much for offering me the position of Accountant with XYZ Corporation. I appreciate your discussing the details of the position with me and giving me time to consider your offer. You have a fine organization and there are many aspects of the position that are very appealing to me.
Here are six steps to help you learn how to write a job acceptance letter. Address the letter to the recruiter or employer. Express gratitude for the offer. Provide written acceptance of the offer. Confirm any terms. Add your signature. Send to the recruiter or employer.
“Thank you for the job offer. I am delighted by this opportunity. I am very interested in working for your organization; however, I would like to explore any flexibility you have in the salary range.” “I am very excited about this position and would like to discuss the benefits you are offering.”
First to answer your question: No, turning them down will not burn any bridges or affect your future employment with them.
Here are Four Effective Ways I Use to Say No: Share Your Priorities. Tell the Truth -- All of It. Deflect -- No, But Here is Someone Who Can. Reduce - No, But Here is What I Can Do.