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Writing an Islamic will (wasiyyah)

Updated 9 November 2026

Most explanations of a wasiyyah stop at the headline number: you can leave up to a third of your estate to whoever you like. What gets skipped is that this third is a hard ceiling, not a starting point, and the other two thirds were never yours to redirect in the first place. Faraid, the fixed inheritance shares, runs underneath a will whether you write one or not.

The one job a wasiyyah has

A wasiyyah is a declaration, written or spoken, of how you want part of your estate handled after you die, and writing it down is advised. In Islamic law it has a specific, limited job: it lets you direct up to one third of your net estate, what's left after debts and funeral costs are settled, to people or causes who would not otherwise inherit under faraid. In the majority schools any zakat you owed is settled first too, while the Hanafi school counts zakat only if you left it in the bequest. It does not let you rewrite who inherits, change how much they get, or override the fixed shares assigned to spouses and parents. Civil law is separate: in England and Wales a will must be in writing, signed and witnessed by two people present together (Wills Act 1837, section 9), so an Islamic will also has to meet those formalities to be enforced. Two other rules in the same Act catch people out: a gift to a person who witnesses the will, or to their spouse or civil partner, is void (section 15), and a later marriage revokes a will unless it was made in expectation of that marriage and shows it is meant to survive (section 18).

The one third ceiling

That third can go to a favorite charity, a friend who cared for you, a grandchild who is otherwise excluded because their parent is still living, or a non-Muslim relative who has no claim under faraid at all. It's a genuinely useful tool for exactly those situations, the people and causes faraid structurally leaves out.

Go beyond a third and the excess bequest needs the consent of your other heirs after you die. Without that consent, most scholars hold that only the first third stands and the remainder reverts to the fixed shares.

Why you can't add to an heir's share

There's a well established principle behind this in the four Sunni schools, often summarized as no bequest to an heir. If someone is already entitled to a fixed share under faraid, a wasiyyah generally can't be used to give them more, or less, than that share, unless the other heirs agree after the death. The reasoning is simple enough: the Quran already assigned their portion, so a will can't quietly renegotiate it. Imami (Twelver Shia) law, and some Zaydi scholars, differ: according to an Al-Fiqh abstract, they allow a bequest to an heir up to one third whether or not the other heirs approve, while the majority require the heirs' permission. Some modern state laws, such as those of Egypt and Iraq, also allow it within the third, according to an academic comparison. If you follow the Ja'fari school, ask a scholar of that school.

Scholars do note one common exception. Other heirs can, after your death, voluntarily agree to let a bequest to one of their own stand. In the Sunni schools that consent has to come from the heirs themselves after your death; it isn't something you can lock in ahead of time just by writing it into the will. Imami scholars take a different view, as above.

Faraid still runs underneath it

Whatever isn't covered by a valid wasiyyah, or all of it, if you never write one, follows faraid. Those shares are fixed by relationship: spouse, children, parents, and, depending on who's living, siblings, grandparents, and others further out. The framework comes primarily from Quran 4:11-12 and 4:176, but the actual arithmetic for a specific family gets complicated fast. Two children and a spouse produce one calculation; a childless couple with living parents produces a completely different one. This genuinely isn't something to estimate from a general formula. A qualified scholar, or a dedicated faraid calculator built for your actual family structure, is the reliable way to get a real number.

Why write one when faraid applies either way

If the fixed shares kick in automatically, it's fair to ask why bother. The honest answer is that faraid handles the math, not the mess around it. Families that never had a conversation about a parent's wishes are far more likely to end up in dispute over things that should have been simple: who manages the process, what happens to sentimental items that don't divide neatly, whether debts and outstanding zakat were even accounted for before anyone got paid. A wasiyyah, even a short one, does real work beyond the one third:

• It names who is authorized to handle the estate, rather than leaving that to be sorted out under pressure.
• It records debts and financial obligations, including zakat you owed but hadn't yet paid, so the estate is settled honestly before any distribution happens.
• It puts your wishes for that one third in writing, instead of leaving family members to guess or argue about what you would have wanted.
• It can name guardians for minor children, a decision faraid itself does not make for you.

That second point matters more than people expect. Debts come out of the estate before faraid divides anything, and in the Maliki, Shafi'i and Hanbali views so does unpaid zakat, so an inflated or understated number changes what every heir actually receives. If you're not sure what you currently owe, running it through a zakat calculator, one that handles crypto at today's value and lets you choose the gold or silver nisab standard, is a better starting point than guessing at year's end.

If you don't have a wasiyyah yet, start with one page: write down what you want your one third to cover, name who should handle your estate, and tell your family, now, where that page will be when they need it.

General information, not a fatwa. Where scholars differ, we try to say so. For your situation, ask a scholar you trust.