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.Does anyone have experience negotiating for a higher salary in a county position? On behalf of XYZ Company, I am pleased to offer you the position of Area Manager in. Riverside, CA. Your start date will be July 15, 2020. Negotiation is an important way to advocate for your professional skills and experiences. Let me start, in fact, with a sweeping generalization. When you're asked to fill out a "Desired salary" or "Minimum acceptable salary" during the application. You'll need to formally accept your offer. If they say yes, you can negotiate all kinds of things not just salary.