An installment agreement lets you make monthly payments on personal or business taxes until you pay the balance in full. This Master Installment Purchase Agreement and Payment Schedule ("Master IPA") is entered into this.A master service agreement (MSA) is a fundamental contract outlining the scope of the relationship between two parties. A payment plan agreement is a written legal document that allows one party to make smaller payments over time to payoff a larger debt. "Installment seller. Installment Payment Financing. At closing, the seller and buyer sign and record an agreement that sets out the terms for payment of the unpaid purchase price. You do not need to sign this Agreement in order to appeal the denial of your payment plan application or what Tier of a payment agreement you are offered. Progress and schedule of key agreements, contracts, permits, approvals, technical studies, financing agreements and major equipment purchase orders. "Holder" shall mean any person, including a seller, who is currently entitled to the rights of a seller under an installment sale contract. 6.