Islamic Inheritance by Madhab — How the Schools Differ on Faraid

Overview: Why the Schools Differ on Inheritance

Islamic inheritance law (ilm al-faraid — the science of obligatory shares) is considered one of the most precisely specified areas of Islamic jurisprudence. The Quran dedicates more detailed arithmetic to inheritance than to any other legal topic, specifying shares of 1/2, 1/4, 1/8, 2/3, 1/3, and 1/6. The Prophet Muhammad (PBUH) described inheritance knowledge as constituting half of all useful knowledge (nisfal-ilm), and the Companions were exhorted to study it deeply.

Yet despite this textual precision, practical inheritance scenarios regularly produce ambiguity. When a deceased person has both a paternal grandfather and a full brother, which takes priority? When the fixed shares add up to more than 100% of the estate, how should each heir's share be reduced? When a wife and two daughters are the only survivors and their combined shares leave a surplus, who receives it? These questions require juristic reasoning, and that reasoning produced different answers across the six schools.

The differences are not merely academic: a single factual scenario (the same estate, the same heirs) can produce materially different distributions under different schools. As the worked example in Section 10 shows, a $500,000 estate distributed to a wife, two daughters, one brother, and a grandfather produces outcomes that vary by tens of thousands of dollars depending on which school is applied. For Muslims who want to plan their estates according to Islamic principles, choosing which school to follow — and documenting that choice — is essential. See our Guide to Choosing an Islamic School for broader context.

The Fixed Shares (Faraid) — Shared by All Schools

Before examining the differences, it is essential to understand the common ground. All six schools agree on the Quranic fixed shares (faraid) for the designated heirs. These shares are derived directly from Quran 4:11–12 and 4:176 and are treated as absolute obligations, not subject to testamentary modification.

After the designated shares are distributed, any residual (baqiyya) passes to the residual heirs (asabah in Sunni schools) — in most cases the closest male agnatic relative of the deceased. It is in the rules governing this residual estate, and in the scenarios where multiple designated heirs compete with different priorities, that the schools diverge most sharply. Use our Islamic Inheritance Calculator to compute specific distributions.

Grandfather vs Siblings — The Major Dispute

Of all the differences between the Islamic schools on inheritance, the question of whether a paternal grandfather (jad) blocks or shares with full brothers and sisters is the most practically significant for large families. The scenario is: a person dies leaving a paternal grandfather (their father's father) and a full brother. Who inherits?

The practical impact is substantial. Consider an estate of $100,000 with only a grandfather and a full brother as heirs:

The debate is recorded in extraordinary detail in the classical sources. Imam Abu Hanifa, Imam Malik, Imam al-Shafi'i, and Imam Ahmad all recorded and analysed the competing hadith reports and Companion opinions. The disagreement traces to a fundamental question about whether generational proximity (ascending vs collateral) or relational proximity (how many “steps” from the deceased) should determine priority. This remains one of the few major inheritance questions where the four Sunni schools are divided two against two.

The Hanafi school applies additional nuance: when the grandfather and multiple siblings are present, the grandfather is guaranteed at minimum 1/3 of the estate, and may receive more if his equal-sharer calculation produces a higher result. The Maliki school applies similar protections. The practical result is that the grandfather is never worse off under the Hanafi/Maliki rule than under an equal-sharing rule with siblings.

Radd: Returning the Surplus Estate

Radd (literally “return” or “restoration”) is the mechanism for distributing surplus estate when the designated shares (faraid) account for less than 100% of the estate and no residual heir (asabah) exists to absorb the remainder. The surplus is “returned” to the designated heirs in proportion to their original shares.

To see the difference numerically: a woman dies, survived by her husband and two daughters. Estate: $120,000.

The difference amounts to $6,000 in this example, with the husband receiving more (and daughters receiving less) under the Ja'fari rule. In larger estates, the difference scales proportionally and can amount to very significant sums. For Muslims in mixed Sunni-Shia families or in Iran, this difference is of immediate practical importance.

Awl: Proportional Reduction When Shares Exceed 100%

Awl (literally “increase” or “swelling”) addresses the opposite problem from radd. Sometimes the fixed Quranic shares assigned to all heirs add up to more than 100% of the estate. When this occurs, the estate cannot literally satisfy all shares in full. The question is: how do you proportionally reduce the shares?

All four Sunni schools, and the mainstream Ja'fari school, apply the same awl methodology: the denominator of the total fractional shares is “swelled” to match the total parts needed, and each heir receives their nominal share of this expanded denominator. This is the equivalent of proportional reduction: everyone receives their share of a smaller pie.

The historical controversy over awl was initiated by Ibn Abbas (a cousin of the Prophet and one of the greatest Quranic commentators), who argued that awl was juristically incorrect. He held that in a situation of deficiency, certain heirs should be prioritised over others rather than all receiving proportionally less. However, Ibn Abbas's view was not adopted by any of the four Sunni schools, which all follow the Umar ibn al-Khattab-sanctioned awl approach that was established through Companion consensus. The Ja'fari school also applies awl, though a small minority of Ja'fari jurists have preserved Ibn Abbas's view.

The Ja'fari Class-Based Inheritance System

The Ja'fari school's approach to inheritance is structurally different from all four Sunni schools. Rather than distinguishing between designated-share heirs (ashab al-faraid) and residual heirs (asabah), the Ja'fari school organises all heirs into a three-tiered class system. Each class completely excludes the next lower class: no Class 2 heir inherits as long as any Class 1 heir is alive; no Class 3 heir inherits as long as any Class 2 heir is alive.

The most significant consequence of this structure is that daughters (Class 1) completely block brothers from the asabah residual mechanism that exists in Sunni inheritance. In the Sunni system, even when daughters take their 2/3 Quranic share, any remaining estate passes to the closest male agnatic relative — typically a brother of the deceased. In the Ja'fari system, there is no asabah concept: the daughters, being Class 1 heirs, have priority over all Class 2 heirs including siblings. The daughters share the entire estate; brothers of the deceased receive nothing as long as daughters survive.

Similarly, in the Ja'fari system, a paternal grandfather (Class 2) is blocked by daughters (Class 1), whereas in the Sunni system, a grandfather may potentially inherit as a residual heir when daughters have taken their 2/3 share. This structural difference has enormous practical implications for how estates are distributed in Shia-majority communities, particularly in Iran where the Ja'fari school is codified in national civil law.

Daughters & Female Relatives — School Differences

All six schools agree that when a son and daughter inherit together, the son receives a double share (li-dhakar mithl hazz al-unthayayn— for the male is the equivalent of the portion of two females), following Quran 4:11. This ratio reflects the structural difference in financial obligations: sons are obligated to financially support wives, children, and parents, while daughters are not under the same mandatory obligations. The differences arise in specific scenarios where daughters are the primary heirs.

This is the most striking practical difference between Sunni and Ja'fari inheritance in real-world estates. A man dies leaving two daughters and a brother, with no son and no father alive. Estate: $300,000.

The $100,000 difference in the brother's entitlement between the Sunni and Ja'fari schools in this example illustrates why inheritance is such a sensitive topic in inter-school and inter-community family situations. Muslims in mixed-school marriages, or those with family members spread across different countries with different legal systems, need to be particularly careful about documenting their inheritance intentions clearly through an Islamic will.

Maternal Relatives (Dhul Arham) — Who Inherits as Last Resort?

When a person dies with no Quranic designated-share heirs and no male agnatic relatives (asabah), the question arises: who inherits? The candidates are the distant uterine relatives (dhul arham) — relatives connected through female lines, such as maternal grandchildren, maternal uncles and aunts, or a daughter's children. The four Sunni schools disagree fundamentally on this point.

The practical significance of this difference has declined in many jurisdictions because modern states no longer operate bayt al-mal in the classical sense, and courts in Muslim-majority countries often apply dhul arham rules even if the official school is Maliki or Shafi'i. In Western countries, the estate would pass to the crown or state under bona vacantia rules if no family heir is identified, making the dhul arham vs bayt al-mal debate largely moot from a local law perspective.

Wasiyyah: Bequest Limits Across Schools

Wasiyyah is the Islamic bequest — the testamentary portion of an estate that the deceased may direct to non-heirs through their will. It is limited to a maximum of one-third of the net estate (after debts) in all schools, based on the hadith of Sa'd ibn Abi Waqqas in which the Prophet limited bequests to one-third. The remaining two-thirds (at minimum) must be distributed according to faraid rules to the legal heirs.

The most significant difference is the Ja'fari permission for a bequest to be made to a legal heir. Under all four Sunni schools, bequests to legal heirs are not permissible because the heir's entitlement is already determined by faraid — making a bequest to an heir would effectively change the faraid allocation, which the Prophet (PBUH) reportedly prohibited. Under the Ja'fari school, a parent may leave an additional bequest to a specific child (within the one-third maximum), provided all heirs consent, allowing for recognition of specific circumstances such as a child who cared for the deceased.

For practical estate planning using an Islamic will, see our Islamic Will Calculator, which helps you model the testamentary and faraid portions of your estate.

Worked Comparison: Same $500,000 Estate Under Four Schools

The following example uses the same estate and the same heirs to show how the distribution differs under four schools. The deceased is a man who dies leaving:

• A wife
• 2 daughters (no sons)
• 1 full brother
• 1 paternal grandfather (father's father)

Net estate (after funeral expenses and debts): $500,000. No wasiyyah. No father or mother survived.

Step 2: Who receives the $104,167 residual?

This is where the schools diverge. The competing claimants for the residual are the full brother and the paternal grandfather.

The analysis reveals a striking divergence. The full brother receives approximately $52,084 under the Hanafi and Maliki schools but absolutely nothing under the Shafi'i and Hanbali schools, where the grandfather takes the entire residual of $104,167. The wife and daughters receive identical amounts under all four Sunni schools — the difference is entirely in how the grandfather and brother split (or do not split) the residual.

This example does not include the Ja'fari outcome because the Ja'fari system would produce yet another result: daughters (Class 1) would absorb the residual through radd if no asabah existed, but the grandfather (Class 2) would be blocked by the daughters. However, the exact outcome depends on the Ja'fari treatment of the wife's radd entitlement, making the calculation more complex. For Ja'fari inheritance, consult our Faraid Calculator or the Islamic Inheritance Calculator.

Practical Guidance: Choosing Your School and Making a Will

The theoretical differences between schools become profoundly practical when a family member dies. The following guidance helps Muslims navigate inheritance planning in a way that honours Islamic obligations and protects their family.