My client pays me a flat rate and I pay independent contractors from this fee. This same money is included as income on the W9 I receive my clients. Since it is a reimbursement and not income how do I apply this to my taxes so it doesn't count as income?

It is income and included on line 1 of Schedule C (Gross receipts or sales). You then deduct, as expenses, what you pay your independent sub-contractors. The expense payments go on line 11 of schedule C. So, you will not be paying tax on that "income'', even though you are reporting it

It is income and included on line 1 of Schedule C (Gross receipts or sales). You then deduct, as expenses, what you pay your independent sub-contractors. The expense payments go on line 11 of schedule C. So, you will not be paying tax on that "income'', even though you are reporting it