Unmarried people who want to codify their financial, medical, and funerary obligations to each other sign a cohabitation agreement.

American attitudes toward non-married couples living together are now more accepting than not.

According to a 2019 Pew Research Center analysis, 69% of American adults believe unmarried couples can live together without intending to marry. 

According to New York City family lawyer Ken Jewell, that may not make sense for a happy couple.

A cohabitation agreement should consider existing or future financial holdings.

Jewell thinks financial duties should be included, but not language about child care.

Walsh Parry says a cohabitation agreement is like a prenuptial agreement in that it only applies if the partnership ends.

While few states recognise common law weddings, Jewell says it's crucial to express explicitly that you're not married.