There is a number that will cause you to walk away from the deal. Ask for something higher than that number. Walk away if they won't meet that number. Your old

There is a number that will cause you to walk away from the deal. Ask for something higher than that number. Walk away if they won't meet that number. Your old salary is irrelevant, and only serves to anchor you in a lower range. Don't lie, just politely decline to tell them. "I'd rather talk about what I'm worth to you".