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I'm not really sure why it was suggested that your husband get a tax ID # (although it won't hurt anything)
That's generally something you need if you are going to be some sort of Corporation, Partnership, etc. It is something he doesn't have to do, and frankly I can see no advantage to changing his status away form Sole Proprietor at this time.
Sole Proprietors are the easiest way to file a business, since unlike Corps and Partnerships, they do not need a separate filing. The Schedule C is part of your personal tax
You will absolutely want to file jointly, if for no other reason that he gets to claim an exemption for you. Form 1040 (Schedule C)
As for deductible expenses, You need to keep track of EVERYTHING.
First, your husband must keep track of his mileage (which should be in log books), along with receipts of anything and everything that he purchased to use on the truck.
I'm referring you to a list of deductions
for truckers, since it would be easier to read it there than for me to make such a long list on your answer. Please see below:
If your husband pays one (or more than 1) helpers more than $600, then yes you and or your husband must send those wokerd 1099
Please let me know if you need any clarification, or if you just have a follow up question.
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