Few subjects in Islamic law are as precise, or as widely misunderstood, as inheritance. When a Muslim passes away, the distribution of what they leave behind is not a matter of personal preference, family negotiation, or a will written from scratch. Instead, the bulk of the estate is divided according to fixed shares laid down directly in the Qur'an. This is the science known as ʿilm al-farāʾiḍ (the knowledge of the obligatory portions), and it governs how every Muslim's wealth is passed to the next generation. This guide explains, step by step, how Islamic inheritance actually works, so that the logic behind the numbers becomes clear rather than intimidating.
Inheritance Is Fixed by Revelation, Not Choice
The starting point that surprises many newcomers is this: in Islam you do not get to decide who inherits most of your estate. The shares of the principal heirs are set out in the Qur'an itself, primarily in three verses of Sūrat al-Nisāʾ — verses 4:11, 4:12, and 4:176. Because these portions come from revelation, they are not subject to amendment by the deceased, the heirs, or the courts. This is why the Prophet (peace be upon him) placed such weight on learning the subject, describing the science of inheritance as "half of knowledge." The phrase signals both its importance and its independence: while much of fiqh is derived through reasoning, the framework of mīrāth arrives largely pre-calculated.
"Allah instructs you concerning your children: for the male, what is equal to the share of two females..."
— Qur'an, Sūrat al-Nisāʾ 4:11
Four Rights Come Before Any Heir Inherits
Before a single share is calculated, the estate must pass through four claims, settled strictly in order. Only what remains after all four is the inheritance proper.
- Funeral and burial costs. The reasonable expenses of washing, shrouding, and burying the deceased are taken first.
- Debts. Outstanding obligations — money owed to people, and according to many scholars certain debts owed to God such as unpaid zakāt — are paid next.
- The bequest (waṣiyya). The deceased may direct up to one-third of the remaining estate to recipients of their choosing. Crucially, this bequest cannot be given to someone who already inherits as a fixed heir, and it cannot exceed one-third without the consent of the heirs.
- The net estate. Whatever remains after the first three claims is the inheritance to be divided among the legal heirs.
Why the one-third cap matters
The waṣiyya gives you a controlled window to benefit a charity, a friend, or a non-inheriting relative. But the cap protects the Qur'anic heirs from being written out. You cannot use a bequest to "top up" a son or a spouse who already inherits — that defeats the very balance the fixed shares were designed to create.
The Three Categories of Heir
Every potential heir falls into one of three tiers, and they are considered in this order of priority.
1. Fixed-share heirs (aṣḥāb al-furūḍ)
These are the heirs whose portions are named outright in the Qur'an. They include the surviving spouse, the parents, the daughters, and certain siblings. Each takes a defined fraction of the estate before anyone else.
2. Residuaries (al-ʿaṣaba)
After the fixed shares are distributed, whatever is left passes to the residuaries. These are mostly the male line — sons, the father, full and paternal brothers, and their descendants. A residuary can receive a large portion or, if the fixed shares have already consumed the estate, nothing at all. The son is the strongest residuary of all.
3. Distant kindred (dhawū al-arḥām)
This third tier — relatives such as maternal uncles, aunts, and grandchildren through daughters — inherits only in the absence of any fixed-share heir (other than a spouse) and any residuary. In practice they inherit relatively rarely, but the category ensures wealth stays within the family rather than lapsing.
The Six Fixed Fractions
The Qur'an assigns the fixed-share heirs from a defined set of six fractions, and no others: 1/2, 1/4, 1/8, 2/3, 1/3, and 1/6. Which fraction a given heir receives depends on the surviving relatives around them. For example, a wife receives 1/4 of her late husband's estate if he left no descendants, but only 1/8 if he did. A single daughter with no son takes 1/2; two or more daughters share 2/3. The system is relational: you cannot know a person's share by looking at them alone — you must look at who else survives.
The Single Most Important Factor: Is There a Descendant?
If there is one question that reshapes an inheritance case more than any other, it is whether the deceased left a descendant — a child, or a son's child. The presence of a descendant reduces the shares of both the spouse and the parents. A husband takes 1/2 of his late wife's estate with no descendant, but 1/4 with one. A wife takes 1/4 with no descendant, but 1/8 with one. The mother's share likewise drops from 1/3 to 1/6 when a descendant survives. Before calculating anything, the first thing a knowledgeable person checks is whether a qualifying descendant exists.
"For the Male, the Share of Two Females" — Read Carefully
This famous phrase from 4:11 is among the most misquoted lines in the entire subject. It is not a blanket statement that men always receive double what women receive. Rather, it applies within a single residuary class — most classically, when sons and daughters inherit together, each son takes the share of two daughters. Outside that specific comparison, the rule does not generalize. Consider:
- When a mother and father each inherit as fixed-share heirs in the presence of a child, they take an equal 1/6 apiece.
- Maternal half-siblings, male and female, share their portion equally, with no doubling of the male.
Seen in context, the doubling reflects specific financial responsibilities placed on men in the same class, not a global ranking of one gender over another.
Blocking: Nearer Heirs Exclude Further Ones
A central mechanic of the system is ḥajb, or blocking, by which a closer relative can prevent a more distant one from inheriting at all. A son, for instance, blocks the deceased's brothers and sisters, and also blocks grandchildren through that line. A mother blocks the grandmothers. Blocking is what keeps the distribution orderly: without it, every conceivable relative would compete for a slice, and the shares would never resolve. Identifying who is blocked is often the first real step in solving a case correctly.
Two Balancing Doctrines: ʿAwl and Radd
Because the fixed fractions are assigned independently, they do not always add up neatly to a whole estate. Two corrective doctrines handle the two ways this can happen.
- ʿAwl (proportional reduction). Sometimes the sum of the fixed shares exceeds the estate — the fractions overflow beyond the whole. In that case every fixed-share heir's portion is reduced proportionally so that the total comes back to one.
- Radd (return of surplus). The opposite can also occur: the fixed shares are distributed, no residuary exists to absorb the remainder, and a surplus is left over. Under radd, that surplus returns to the fixed-share heirs in proportion to their shares — with the spouse generally excluded from the return.
These doctrines are not loopholes; they are the system's built-in way of keeping the arithmetic honest in both directions.
Who Actually Qualifies to Inherit
Three conditions must all be met for inheritance to take effect: the death of the deceased must be established, the heir must be alive at the moment of that death, and no legal barrier may stand between them. On the matter of barriers, two are widely recognized:
- Difference of religion. A Muslim and a non-Muslim do not inherit from one another through the rules of Islamic inheritance.
- Unlawfully causing the death. One who wrongfully causes the death of the person from whom they would inherit is barred from inheriting them — a safeguard against the unthinkable incentive that would otherwise exist.
Where the finer details of these conditions are concerned, scholars differ on some particulars, and a qualified specialist should be consulted for any real situation.
Putting It Together
Islamic inheritance, then, follows a clear sequence: settle the four rights from the estate, identify the surviving heirs, sort them into fixed-share heirs, residuaries, and distant kindred, apply blocking to remove those excluded, assign the six fractions, and finally correct with ʿawl or radd if the numbers require it. What looks at first like a maze of fractions is in fact a disciplined, repeatable process — one that protects the vulnerable, honors family ties, and removes the disputes that so often follow a death.
If you would like to go deeper, our complete guide walks through each heir and fraction in detail, and you may find these companion articles helpful: spouse inheritance shares and the inheritance of daughters in Islam. To see exactly how these rules apply to a specific family, use the inheritance calculator.
This article is provided for education and general understanding only. It does not constitute a fatwa or a binding ruling for any individual case. Real inheritance situations often involve subtle details that change the outcome, and scholars differ on some points. Always have an actual case confirmed by a qualified scholar or specialist in Islamic inheritance before acting on it.