While Cohabitation Agreements, prenups and postnups all set out what happens should a relationship break down, there are several differences between them.
A Cohabitation Agreement is used where unmarried partners live together. A Prenuptial agreement (or ‘prenup’) is used before a couple gets married (or enters into a civil partnership). A Postnuptial agreement (or ‘postnup’) is used after a couple has gotten married (or entered into a civil partnership).
For more information, read How to make a prenuptial agreement and Postnuptial agreements.