It’s a harsh reality, but your boss doesn’t want to give you a raise in 99 cases out of a hundred. Part of what keeps her business profitable is keeping overhead low. Often times the biggest overhead cost in a company is labor. That’s a huge hurdle to overcome from the word go.
But hey, there’s some good news. Your boss might not want to give you a raise, but she probably -- hopefully, if you’re asking for more money -- wants to retain you as an employee. That’s where you’re going to find leverage to ask for a raise. It’s not about threatening to walk. That’s never a good bargaining tactic. However, you have to look at asking for a raise less in terms of what you want (more money) than what you can do for your boss (more value).