Three things to be concerned about: 1) Current employer might pay you more, until they can find a replacement. So the wording is important. 2) Have a quantit

Three things to be concerned about: 1) Current employer might pay you more, until they can find a replacement. So the wording is important. 2) Have a quantitative number in mind. They need to offer at least 100 for me to be happy. 90 I will stay but not be happy. 89 I am definitely going. Based on the fact that you posted here, you are enough in doubt that a 20% raise would easily tip the scale. 3) Think of non monetary items that you would like. Parking space, breakfast, no overtime or at least no free overtime.