• The market value for your position and how your salary compares.
• Company Policy on raises. Are they awarded annually, bi-annually? Make sure that your request coincides with the company policy. It is often difficult for a manager to award an increase out-side of the policy dates.
• Company Policy on starting salaries and raises. Many companies will have levels based on job skills/experience. You need to understand these levels, and at what level the company has placed you. There will likely be a salary range per level. If the company is not transparent about the salary range, you can ask for your % to mid-point in that range.
• Company Policy on the % increase based on year-end performance review. Normally companies will give a higher % increase to high performers. However, if your salary is at the top of your salary range, increase may be limited.
• Company’s average % raise awarded this year (or last year, if raises have not yet been given this year)
• Company’s financial health. Can the company afford raises?
• Inflation rate. Does your raise at least cover the cost of living?
• How the company regards you. Are you considered a high performer? Are you appreciated by your boss and colleagues?
• Would it be easy for the company to replace you with someone at a similar or lower salary level?
• If you do not get the raise, would you be able to find a similar position at another company for a higher salary?
Considering all the above points will make you more knowledgeable and utimately more successful in negotiating your salary.