A prenuptial agreement can also be useful estate planning tool as it can provide for the distribution of assets between spouses in the event of death or divorce. Prenuptial agreements are generally considered by people entering into a subsequent marriage who want to preserve assets for children from a prior marriage. Prenuptial agreements are beneficial to people considering marriage to a person of unequal wealth.

Postnuptial agreements, meaning agreements made between spouses after they marry, are considered valid in New Hampshire.  Like prenuptial agreements, which are prepared before the marriage, postnuptial agreements also provide for the distribution of assets between spouses when one of them dies or the couple divorces.