Understanding Cohabitation Agreements in Illinois: Protecting Your Future Together (or Apart) In Illinois, the legal landscape for unmarried couples is vastly different from that for married couples. Unlike some states, Illinois does not recognize common-law marriage, meaning that simply living together for a certain period, even for decades, does not grant you the same rights or protections as a married couple. This fundamental difference makes a cohabitation agreement an indispensable tool for many individuals choosing to share their lives without tying the knot. What is a Cohabitation Agreement? A cohabitation agreement, sometimes called a "living together agreement" or "non-marital agreement," is a legally binding contract entered into by two individuals who live together but are not married. It serves a similar purpose to a prenuptial agreement for married couples, outlining each partner's rights and responsibilities regarding finances, propert...