How day-traders taxed w/out MTM?

It was probably asked a million times but don't see exact answer to this question:

-Assume I made $10,000 from trading in 2007 (short-term trades)

-Assume I made $20,000 from my day-job, I do elect MTM due to my day job.

How will I a be taxed on $10,000 day-trading income?

Is it just added to my day-job income of $20,000 making my annual taxable income $30,000 or....$10K taxed seperately at different rate and term?

Thanks.
 
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