An IRS installment agreement is an option for some taxpayers who are unable to pay the full amount of taxes they owe at the time of filing. It allows the liabilty to be paid off in monthly payments over the course of 72 months, and, if the taxpayers financial circumstances improve, he or she may pay the entire balance owed at any time while payments are being made. To determine if you qualify for an installment agreement, it’s important to speak with a qualified tax expert.