I currently have an installment agreement with the IRS to pay back taxes owed (1997 year) and just found out that I will owe more taxes for 2006. Can I have the 2006 taxes combined with my current installment agreement or do I have to pay it in full? Any help would be appreciated

You would have to renegotiate your agreement with the IRS.

Renegotiate is a bit more complex.

Just ask to have the 2006 taxes included in the repayment plan.