"...because I have a DBA and sales tax ID, that I HAD to file as a business with the IRS."
Your sales tax ID and DBA has no direct bearing on the IRS determining whether you have a business or hobby. If you had a Federal Tax ID it would have more, but not definitive bearing.
From another IRS bulletin:
What is a hobby? Hobbies, also called not-for-profit activities, are those activities that are not pursued for profit. What is a business? Generally, your activity is considered a business if it is carried on with the reasonable expectation of earning a profit.
If you are not sure whether you are running a business or simply enjoying a hobby, here are some of the factors you should consider:
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Does the time and effort put into the activity indicate an intention to make a profit?
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Do you depend on income from the activity?
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If there are losses, are they due to circumstances beyond your control or did they occur in he start-up phase of the business?
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Have you changed methods of operation to improve profitability.
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Do you have the knowledge needed to carry on the activity as a successful business?
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Have you made a profit in similar activities in the past?
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Does the activity make a profit in some years?
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Do you expect to make a profit in the future from the appreciation of assets used in the activity?
An activity is presumed carried on for profit if it makes a profit in at least three of the last five tax years, including the current year (or at least two of the last seven years for activities that consist primarily of breeding, showing, training or racing horses).
Ref URL: http://www.irs.gov/newsroom/article/0,,id=172833,00.html
Again, note there is no reference to either name (many successful hobbyists sell under a DBA; i.e., "Quilts By SuzieQ) or collection and payment of sales taxes
Also, keep in mind that the
IRS actually prefers for private activity to be classified as a business, not a hobby. Their position is that too many people (and they supposedly have the stats to prove it) use hobby activities to generate looses to offset other taxable income. I've never heard of the IRS challenging a business by asserting they were in fact a hobby; challenges are exclusively against hobbyists generating losses above and beyond the cost of operating their hobby.
So, a very good rule of thumb is if you are declaring your activity a hobby, but consistently showing losses to offset other income, you might brace for an eventual challenge of your status. If you're consistently showing a profit (and you have to report the profit as taxable income either way) you can handle you activity either way -- however, if you are consistently profitable you are probably leaving deductible business expenses off your returns by claiming to be a hobby.
If you need more info for your own activity, either order - or read online -- IRS Publication 535, Business Expenses.
Correct IRS website: http://www.irs.gov