Do Your Homework
Before meeting with your manager, gather as much comparative salary data as you can for your specific job and geographic market. Asking a recruiter in your field or asking a trusted colleague to share their own pay are both good ways to find this information, along with online research.
While outside research on salary is always helpful, you may also consider asking your internal human resources department for any information they can share on your company’s salary levels, or “bands.” Many companies have a maximum and minimum salary for a particular position, title or level. Finding out where your current income falls on their scale will help you assess whether to negotiate for a raise—or a promotion to a higher band.