It's more than others make here. I can't justify it to my boss. You're becoming too expensive. Prepare to respond positively to these and other objections. Think in terms of compensation options.
Most employers are more willing to negotiate benefits than base salary.
Consider what incentives you can present to your employer when faced with any of these objections. If timing is the problem, ask for a salary review meeting within three months. If you want desired outcomes, you must close and follow-up your meeting properly. To close this meeting, briefly summarize your discussion. Second, be sure to establish a follow-up procedure.