You are correct, guaranteed payments for services are subject to self-employment taxes. They would be listed in box 4(a) on your K-1 schedule. If they are listed in box 4(b) as guaranteed payments for capital, they would not be subject to self-employment tax however. If your guaranteed payments are subject to self-employment tax, they should also be listed in box 14 on your K-1 schedule. If your K-1 does not have the income listed in box 14, you can enter it to get the correct treatment of your guaranteed payments for self-employment tax purposes.
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