I didn't want to start a new thread for this question and
I think it fits into this thread.
I read that traders have the option to make the
mark-to-market election. I'm wondering if you have to
be a "securities trader" to make this election?
Suppose you have a job and you trade part-time in
the morning before work or at work

. Could
you be able to make the mark-to-market election or
is it only available to full time traders?
Also, if I was a full time trader. Could I deduct my new
computer as business expenses? My guess is yes.
How about this? Suppose I make 10k in the whole
trading year. I should pay like 3k in taxes. If I
did buy a computer for 3k for my trading business, does
this mean they cancel out and I won't have to pay any taxes?