<prompt> Human: Hello!Not sure if this is the right place to post this, but you guys always give great advice.I recently accepted a promotion with a new company that offered me a 40 pay raise from where I currently am. Once I accepted this offer, I submitted my two week resignation letter to my manager. The very next day, I get in a meeting with two Senior Directors and they both say that they would love for me to stay with the company and are offering me a similar promotion. They asked me what the salary was for the offer that I accepted and I told them that it is 7k more than it really is I panicked and thought I was being a sly negotiator - I regret this thinking now. Anyways, they offered me the role today and are working on salary information that they hope to provide to me by the end of the day.My question is, since I already accepted the offer from another company and am expected to start soon, is it too late to negotiate a higher salary if my current employer matches or gives me a bigger offer? Would my current company ask to see my offer letter to confirm the salary that I stupidly lied about? I dont hate my current company, but its a very corporate cubicle lifestyle job whereas this new company is a bit more laid back which is what I am interested in.The 2 Senior Directors said they will support any decision that I make.Edit 1: This is my first ever salary negotiation. I have no idea what Im doing.Edit 2: Just got salary numbers. They said they would match the inflated offer that I received. They again reiterated that they will support any decision I make.Edit 3: Ive decided to take the opportunity with the new company. Thanks for all the knowledge guys, I feel like I learned so much on such an important topic.  <response>: Dont stay. First, you already signed an offer. Trying to re-negotiate runs the strong risk that the other employer backs out entirely. Its a bad thing to do. It may burn bridges in the future.However, leaving your current employer and expressing how much you loved working there... leaves doors open. If the new job sucks and the old company gets desperate, in 3-6 months you might be able to hop back over at a raised salary. Win. win. 