There is your perception of your worth in terms of base salary and bonus and then there is the realistic market value of what the employer is paying for that new job.  Often times candidates feel undervalued with their current comp plan.

When you are working with a recruiter that is representing you to a client you must trust the relationship and be open and honest. If in doubt tell the truth.

When discussing  the details of your current compensation: Base, Bonus, Stock, RSU's, LTI's, vacation time off...