How would you feel if you found out all of your coworkers were making 15-25k more than you? Especially if youre more knowledgeable and been their longer?
I'll tell you in the IT contracting world, I've seen people doing the same exact job, but one making 40k more other. And it aint because of seniority. One person making 60k and the other making 95k. This is really prevalent in the Help desk / Service Desk area. But even in the Tier 3. You'll have most of the team making 105k to 120k with a measly 3% yearly increase and the new Guy comes in making 140k - 150k knowing a fraction of the job. Sometimes loyalty hurts you, but a lot of people get comfortable. I move around unless the job is really cool.
And a lot of people don't negotiate right. You have to ask question as if you're the prize, you real are. If they paying you 100k, they getting probably 140-160k for the position. All always ask if there's pay range.
And please always tell them you make more than you do. I just switched jobs exactly one month ago. Told them I made 15k more than I actually did. Did the interview, offer comes back. 20K more than I stated.
35k jump.
Should've asked for another extra week of leave also.