I'm a stay-at-home mom and my only income last year was $2,000 from babysitting (which I did, caring for a friend's child for a few months last summer). I entered that as self-employment business income. I didn't bother claiming any expenses as deductions. My line 13499 amount shows the $2,000 I entered, but the net amount on line 13500 says 6,043.96. Why is this? I didn't earn 6,043.96.