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Taxes due for hobbyist Group Buy
From the poster's description of this activity, it doesn't look like he is engaged in a business, so Schedule C would not be appropriate. The first paragraph of the IRS Instructions for Schedule C is as follows: Use Schedule C (Form 1040) to report income or loss from a business   you operated or a profession you practiced as a sole proprietor. An   activity qualifies as a business if your primary purpose for engaging   in the activity is for income or profit and you are involved in the   activity with continuity and regularity. For example, a sporadic   activity or a hobby does not qualify as a business. To report income   from a nonbusiness activity, see the instructions for Form 1040, line   21, or Form 1040NR, line 21. What the poster is doing is acting as a nominee or agent for his members. For instance, if I give you $3.00 and ask you to go into Starbucks and buy me a pumpkin-spice latte, you do not have income or receipts of $3.00, and you are not engaged in a business. The amounts that the poster's members are forwarding him are like this.  Money that the poster receives for his trouble should be reported as nonbusiness income on Line 21 of Form 1040, in accordance with the instructions quoted above and the instructions for Form 1040. Finally, it should be noted that the poster cannot take deductions or losses relating to this activity. So he can't deduct any expenses of organizing the group buy on his tax return. Of course, this would not be the case if the group buy really is the poster's business and not just a "hobby." Of course, it goes without saying that the poster should document all of this activity with receipts, contemporaneous emails (and if available, contracts) - as well as anything else that could possibly be relevant to proving the nature of this activity in the event of an audit.