You cannot take a deduction for self-employment taxes when you only paid the employee share of them. If the client issued you a W2 and treated you as an employee you cannot take a deduction for what they paid and the half the employee pays is not deductible. So, if you were not an employee you would have to get this all straightened out with the client who issued you the W2. But, you can not deduct any of the FICA taxes with the way things currently are.
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