Is a prenup allowed in Islam?

Yes, generally, as long as its terms don't go against Islam. Islam already lets couples add conditions to the marriage contract, and the Prophet ﷺ said those conditions deserve to be honored most. A prenup that protects both spouses fairly can be allowed. Terms that cancel the wife's mahr or maintenance, or change inheritance shares, aren't valid.
Conditions in the nikah
The Prophet Muhammad ﷺ said: "From among all the conditions which you have to fulfill, the conditions which make it legal for you to have sexual relations (i.e. the marriage contract) have the greatest right to be fulfilled" (Sahih al-Bukhari 2721). He also said: "Muslims are on (i.e. stick to) their conditions" (Sunan Abi Dawud 3594).
Conditions many couples include
- The wife can continue her studies or career.
- The couple will live in a certain city or country.
- The husband won't take a second wife, or the wife gets the right to divorce if he does.
- The wife has a delegated right of divorce (talaq tafwid) in certain cases.
Scholars differ on how binding some of these are. The Hanbali school is the most supportive, holding the husband to conditions like "no second wife." Other schools say the marriage is valid but such conditions may not be enforceable. Many imams therefore encourage writing them clearly.
What a prenup can't do
- Remove the mahr or the husband's duty to provide.
- Change Islamic inheritance shares. See Do I have to follow Islamic inheritance rules in my will?
- Make haram things halal, like requiring interest-based investments.
Civil prenups in the West
In the UK, Europe and the USA, a civil prenup mainly decides how property is divided after divorce. Splitting assets you each brought into the marriage, or agreed savings, can fit Islamic principles. Courts in some countries don't fully enforce prenups, so get advice from a family lawyer who understands Islamic contracts, and keep your Islamic nikah conditions in writing too.
- Islam allows conditions in the marriage contract.
- A fair prenup is generally allowed.
- It can't cancel mahr, maintenance or inheritance rules.
- Get legal and religious advice before signing.
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