Do your research on salaries in the market; average raises in your position and the performance appraisal track record that has tracked your accomplishments. Make sure to include any other relevant information as well that can help you convince your employer to give you a raise. Have a clear idea of what you want to ask your employer and ensure that you're flexible in your approach to negotiating a better salary. Next, set up a meeting with your supervisor. Discuss your request with them, supported by your research. Make sure you stay calm, concise, and to the point. It's essential that you provide your supervisor with a rational request.