Research tells you you're underpaid.
This is a pretty solid sign.
"You must stay on top of the current salaries for your type of position," Taylor says. "There are many online sources for this, including PayScale.com, Glassdoor.com, Indeed.com and Salary.com."
Kerr says using an online salary calculator to see where average wages are, or should be, for someone in your role, with your level of education and years of experience, can be a good starting point and may indicate if there's a huge discrepancy between your wage and the going rate.