It sounds like you are treating your art sales as a hobby and not a business. It is important to note that all income, unless specifically excluded by the Code, is taxable. Your art sales are required to be reported as Other Income, which will appear on line 21, of page 1 of the Form 1040. You will need to recap your sales records to report your art sales for 2013. Going forward into this year, you should keep track of all sales made (date and amount). As a hobby, you can deduct any hobby expenses as a miscellaneous deduction on Schedule A (to the extent of hobby income). If you take the standard deduction and do not itemize, you still need to report the art sales as other income.
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