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Does U.S. tax code call for small business owners to count business purchases as personal income?
Expenses are where the catch is found.  Not all expenditures are considered expenses for tax purposes.  Good CPAs make a comfortable living untangling this sort of thing.  Advice for both of your family members' businesses...consult with a CPA before making big purchases.  They may need to adjust the way they buy, or the timing of it, or simply to set aside capital to pay the taxes for the profit used to purchase those items.  CPA can help find the best path.  That 10k in unallocated income can be used to redecorate your office, but there's still 3k in taxes due on it. Bottom Line:  Can't label business income as profit until the taxes have been paid.