What you just said... expense... expense is money out... i.e. expending.
expense can be written off as a tax advantage, thus adding to the NOL or Net Operating Loss... because it cost more to operate the business... or an expense as part of running the business... thus making them more valuable not less.
the key is to have more incoming than outgoing otherwise most will end up in BK... as they would have more debts than revenue; so balance is essential.
what you want is to write off just enough to a point where you grow but pay lower taxes.
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