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Negative taxes on employee paycheck

I copy payroll from our payroll company into Quickbooks employee payroll.  I have a paycheck that is a $90 reimbursement and then $90 going taxfree to the employees HSA.  Thus the payroll taxes are negative (with a $11 net payroll check) for both employee contribution and employer contribution.  Quickbooks won't allow a negative tax amount.  How do I enter this so the payroll is correct?  Any suggestions?