An illinois separation agreement is a legal document that helps married couples who no longer wish to live together but do not wish to get divorced. You should not use a separation agreement if you don`t know where your spouse is or if your spouse refuses to accept. This form is a combined separation,. At the expiration of this _____ year period, the parties agree to place the marital residence up for sale with a licensed real estate. Web a separation agreement is available for both married and unmarried couples.