What is the main advantage for Joan’ s career, if her increased sales continue?

M: Hi, Joan. I see you are working on your spreadsheet. How are your sales figures matching up to our goals?
W: I’ m doing fine. I’ m 15% ahead of my sales from last year and I was only projecting a 10% increase.   That will help me get recognized by management,  and if I continue at this rate, they’ll increase my area.
M: That’ s great. Did you get your commission check yet?
W: Not yet. It comes at the end of the month. I am going to make more money, but more is deducted in taxes, too. So, it’s not as much of an increase as you might expect.