Final billing under THIS CONTRACT shall be submitted in a timely manner but not later than three (3) months after completion of the SERVICES. Michigan Legal Help has tools to fill many kinds of forms but we do not cover all areas.You may have a blank form that you need to fill out on your own. This file contains the Michigan Department of Treasury's Installment Agreement form for individuals and businesses seeking to establish a payment plan. Download the Agreement(s) from below on this Standard Agreements and Templates page. 1. Identify the Buyer and Seller details. This could also be in the form of fixed payments. See our website instructions for what forms are required to be filed together in a single attachment. In the event that taxes must be paid on any materials necessary to complete the contract, the. Contractor shall bear the cost and responsibility of such taxes.