You can negotiate and offer "anytime" before you accept and start. As long as you have not accepted the offer letter, the whole 'negotiation' is still in play.A counter offer letter is a physical letter or email candidates send to an employer when they want to negotiate the terms of a job offer given to them. Our guide provides valuable insights on how to negotiate salary offers effectively and ensure you're earning what you deserve in the competitive Florida job We've compiled a definitive guide, made up of all of the key, important questions to ask, in order to cover an all-encompassing range of integral bases. Negotiation is an important way to advocate for your professional skills and experiences. Let me start, in fact, with a sweeping generalization. You should ask for and receive an offer letter. An offer letter ensures that you and your employer understand the position and its offer. The offered salary may or may not be negotiable, and it may or may not be a fair offer.