The pious obligation of a Hindu son to discharge the personal debts of his father is one of the oldest doctrines of Hindu Law. Rooted in Smriti texts and absorbed into the Mitakshara coparcenary, it imposed a religious duty — putra-rina-uddhar, the redemption of the father's debt — on the son, the grandson and the great-grandson, so that the father's soul would not face evil consequences in the afterlife. With the Hindu Succession (Amendment) Act, 2005, that ancient doctrine was sharply curtailed. Section 6(4), inserted with effect from 9 September 2005, prospectively abolished the rule. But the doctrine has not vanished — it survives, in living shape, for every debt contracted before 9 September 2005 that remains unsatisfied.

This chapter sets out the pre-2005 doctrine in full, examines the conditions on which it operated, distinguishes vyavaharika from avyavaharika debts, traces its tense interaction with the Karta's power of alienation, and then maps the changes worked by the 2005 Amendment. The doctrine is alive on the exam paper precisely because it is half-alive in the statute book: a question on a 1998 mortgage tested in 2026 is still answered by the old doctrine. Skip a paragraph and you misread the proviso.

Concept — rina-pradana and putra-rina-uddhar

Hindu Sastric thought treated a debt as a sin. The unpaid debt darkened the debtor's spiritual record and could, on the textual authorities, follow him into the next life. Brihaspati put it in stark terms: he who, having received a sum lent, does not repay it to the owner, will be born hereafter in his creditor's house — as a slave, a servant, a woman or a quadruped. The son's obligation to pay was therefore not a creditor's remedy but a son's filial duty: a religious act of deliverance directed at the father's soul, not at the creditor's pocket.

This is what Mitakshara authorities meant by rina-pradana — the giving of the debt — and putra-rina-uddhar — the son's lifting of the father's debt. The doctrine attached even where the son possessed no joint family property; the duty was personal in the spiritual sense. Once the British Indian courts began to apply the rule, however, the spiritual root of the doctrine was retained but its operation was placed on a strictly proprietary footing. The son's liability ceased to be a personal liability beyond the joint family estate; it became a charge upon his interest in coparcenary property, and that alone.

Operation in the Mitakshara coparcenary (pre-2005)

The classical doctrine operated within the four-degree Mitakshara coparcenary that existed before the 2005 reform. The father, his son, his grandson and his great-grandson formed an unbroken chain of male descendants, each a coparcener by birth, each entitled to a share by survivorship. Pious obligation rode along that chain. Debts contracted by the father — for his personal benefit, not for the family — were not, by themselves, debts of the family; but the son, grandson and great-grandson were each bound, by religious duty, to discharge them out of the coparcenary property they shared with the father.

The mechanics were these. The creditor of the father could sue the father alone, obtain a money decree, and then bring the entire coparcenary interest — the father's share and the son's share both — to sale in execution. The sale would bind the son even though the son was not a party to the suit, because the sons' interest was already burdened with the father's debt by operation of pious obligation. Equally, the father, acting in his capacity as Karta, could himself alienate joint family property to discharge his antecedent debt, and that alienation would bind the sons. The technical key was the Hanooman Persaud Pandey three-limb test for alienation by Karta — legal necessity, benefit of estate, and pious obligation — which is fully developed in our chapter on joint Hindu family, Karta and coparcenary. Pious obligation was the third limb, and it was the limb that allowed a father to mortgage or sell the sons' share to satisfy his own personal debt.

The liability had four marked features. First, it ran only against the father's debt — the debt of a brother, an uncle or a cousin would not bind the son. In Masit Ullah v. Damodar the rule was applied even to a great-grandfather's debt: a son's interest in joint property was held bound by the sale because he was liable to discharge his great-grandfather's antecedent debt. But a nephew was held not liable for his uncle's debt; nor a brother for his brother's; nor a wife (after she had taken her share on partition) for her husband's debt. Second, the liability was real, not personal — it ran against the son's interest in the coparcenary property and not against his person or his separate property. Third, the liability did not require the father to be Karta — even a non-Karta father could expose his sons' interest to liability, because the doctrine was personal-law, not agency-based. Fourth, the liability subsisted only so long as the father's own liability subsisted; if the father's debt became time-barred, the sons' obligation died with it.

Three conditions for the doctrine to apply

The doctrine operated only where three conditions were satisfied. These three conditions were the working test the courts applied throughout the pre-2005 period, and they remain the test for any pre-2005 debt being litigated today.

  1. The debt must be the debt of the father (or grandfather, or great-grandfather). Pious obligation runs vertically along the four-degree chain. It does not run laterally. The debt of a collateral — a brother, an uncle, a cousin — does not engage the doctrine. The debt of a wife after partition does not engage it. The doctrine is filial, not familial in the broad sense.
  2. The debt must be antecedent — incurred before the alienation in question, not contemporaneous with it. The classic exposition is in Brij Narain v. Mangla Prasad (1924), the Privy Council's celebrated five propositions on the law of alienation by a father. An alienation by a father of joint family property to satisfy his antecedent debt binds the sons; an alienation that is part and parcel of the very transaction that creates the debt is not antecedent and does not bind. Antecedent in fact and in time — that is the formula. A loan advanced on the occasion of the very mortgage that secures it is not antecedent; the sons remain free to challenge.
  3. The debt must not be tainted — it must not be avyavaharika. A debt contracted for an immoral or illegal purpose — for gambling, for drink, for keeping a mistress, for the perpetration of crime — does not bind the sons. The sons can prove the taint and resist the creditor. The burden of proving the taint is on the son, but circumstantial evidence is admissible and often telling.

The five propositions of Brij Narain deserve to be remembered as a set, because the case is a perennial favourite on judiciary papers. In summary form: (i) the manager of a joint Hindu family cannot alienate or burden the estate qua manager except for the purpose of necessity; (ii) if he is the father and the others are sons, he may, by incurring debt for a non-immoral purpose, expose the estate to execution; (iii) if he purports to burden the estate by mortgage, the mortgage will not bind unless it is for an antecedent debt; (iv) the antecedent debt must be antecedent in fact as well as in time; and (v) there is no rule that mortgages are an exception to the doctrine. The earlier exposition in Suraj Bunsi Koer v. Sheo Prashad laid the groundwork for these propositions, and the post-Brij Narain case law has spent a century working out the gloss on propositions (ii) and (iii).

Vyavaharika versus avyavaharika debts

The vyavaharika/avyavaharika distinction is the doctrinal heart of the immorality test. The word vyavahara means "in the normal course"; avyavaharika is its negation — debts that a respectable man would not have contracted, debts repugnant to good morals. The Smritis listed the categories: debts for spirituous liquor, debts due for lust, debts due for gambling, unpaid fines, unpaid tolls, useless gifts made under the influence of lust or wrath, debts of suretiship for honesty (as distinct from suretiship for money or goods), and commercial debts. The classical text comes from Usanas, quoted by Mitakshara on Yajnavalkya: whatever is not vyavaharika has not to be paid by the sons.

The Supreme Court in S.M. Jakati v. S.M. Borkar (1959) explained the modern test. A debt is avyavaharika when its source is so distinctly immoral or illegal that a decent and respectable man, acting within the law and ordinary morality, would not have contracted it. Petty irregularities of business judgment do not taint the debt; the taint must be substantial, going to the root of the transaction. Where the father had embezzled funds entrusted to him as chairman of a society and the suit land was sold to repay the embezzlement, the sale was held tainted and the sons' interest was not bound. Where the father had committed criminal breach of trust under Section 405 IPC and the debt arose out of the criminal act, the debt was avyavaharika. But where the father had taken a Tagai loan from the Government to improve the joint family lands, as in V.D. Deshpande v. S.K.D. Kulkarni, the loan was vyavaharika — even after partition, the joint family property in the hands of the sons remained liable because no provision for repayment had been made at the partition.

Conversely, the following have been held vyavaharika and binding: a debt incurred for a new family business; a debt incurred to pay arrears of income tax; a promissory note executed by the father for payment of a time-barred debt; a debt arising from negligence in the discharge of one's duties (as opposed to a debt arising from a criminal act). The line is not always crisp, and the case law fills the interstices. But the controlling principle is the one Jakati stated: distinctly immoral or illegal versus merely imprudent.

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9 September 2005 ended pious obligation prospectively. Pre-2005 debts continue.

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Effect on alienation by Karta — the Hanooman Persaud third limb

The Hanooman Persaud Pandey test for alienation by Karta has three limbs: legal necessity, benefit of estate, and pious obligation. Pious obligation was the limb that gave a father, acting as Karta, the special power to alienate joint family property — even the sons' shares — to discharge his antecedent personal debt. The other two limbs (legal necessity and benefit of estate) are common to every Karta; pious obligation was peculiar to a father vis-à-vis his sons. The full mechanics of the Karta's authority and the coparcenary structure are discussed elsewhere; here the focus is the third limb alone.

An alienation that satisfied the antecedent-debt requirement and the non-tainted requirement was binding on the sons. Where the alienation was made on the occasion of the very debt — that is, where the debt and the mortgage were contemporaneous — the alienation failed the antecedence test and was not binding. D. Keshavanarayana v. C. Lakshmavadhani illustrates the rule: the father executed a simple mortgage for Rs. 10,000 on a clear understanding that an advance of Rs. 7,000 would be made before the mortgage and Rs. 3,000 at the time of execution. The Rs. 7,000 was held not antecedent because it was part of the same transaction. Devabrata Luni v. C. Lakshma Vadhani followed the same line. Where, however, the property was sold in execution of a money decree against the father — as opposed to the father himself executing a mortgage — the antecedence inquiry took a different shape. The Supreme Court in Faquir Chand v. Harnam Kaur held that if there is a just debt owing to the father, the creditor may realize it by sale of the property in execution of the decree; the son cannot interfere unless he can show that the debt is non-existent or tainted.

Personal liability of the son — the Sidheshwar Mukherjee clarification

A common student error is to treat the son's pious obligation as creating a personal liability. It does not. The Supreme Court in Sidheshwar Mukherjee v. Bhubneshwari Prasad Narain (1953) clarified that the liability is real, not personal — confined to the son's interest in the coparcenary property. The creditor of the father cannot proceed against the person of the son, nor against the son's separate property, nor against his earnings. The doctrine creates a charge on the joint family property that the son shares with the father; nothing more.

This proprietary nature of the liability has three consequences. First, where there is no joint family property, there is no liability. The son who owns only his self-acquired property cannot be made to satisfy his father's debt out of those self-acquisitions. Second, the value of the son's exposure is capped at the value of his coparcenary interest. Third, on partition the doctrine continues to apply to pre-partition debts of the father provided the partition arrangement makes no provision for the discharge of those debts and the debts are not tainted. The Supreme Court in Pannalal v. Mst. Naraini applied this rule: the sons' interest, even after partition, remained liable for the father's pre-partition debt where no provision had been made at the partition for its discharge.

Section 6(4) HSA — the 2005 prospective abolition

The Hindu Succession (Amendment) Act, 2005, came into force on 9 September 2005. Together with the rewriting of Section 6 to confer coparcenary status on daughters, the Amendment inserted a new sub-section — Section 6(4) — that prospectively abolished the doctrine of pious obligation. The sub-section reads as follows:

After the commencement of the Hindu Succession (Amendment) Act, 2005, no court shall recognise any right to proceed against a son, grandson or great-grandson for the recovery of any debt due from his father, grandfather or great-grandfather solely on the ground of the pious obligation under the Hindu law, of such son, grandson or great-grandson to discharge any such debt: Provided that in the case of any debt contracted before the commencement of the Hindu Succession (Amendment) Act, 2005, nothing contained in this sub-section shall affect — (a) the right of any creditor to proceed against the son, grandson or great-grandson, as the case may be; or (b) any alienation made in respect of or in satisfaction of, any such debt, and any such right or alienation shall be enforceable under the rule of pious obligation in the same manner and to the same extent as it would have been enforceable as if the Hindu Succession (Amendment) Act, 2005 had not been enacted.

The sub-section does three things at once. The main clause prospectively bars any court from recognising the pious obligation as a ground for proceeding against the son, grandson or great-grandson for a debt contracted on or after 9 September 2005. The first proviso preserves the creditor's right against the son, grandson or great-grandson for any debt contracted before the commencement date. The second proviso preserves the validity of alienations already made in respect of or in satisfaction of such pre-commencement debts.

The structure is therefore prospective abolition with a transitional savings clause. Debts of 9 September 2005 onwards are not enforceable against the son, grandson or great-grandson on the strength of pious obligation alone. Debts contracted before 9 September 2005 continue to be enforceable as if the Amendment had not been enacted; alienations already made on the strength of those pre-2005 debts continue to be valid.

Practical effect post-2005 — what creditors must rely on now

For debts contracted on or after 9 September 2005, a creditor cannot proceed against the sons of his debtor on the strength of pious obligation. He must rely on contractual privity — the son must be a co-debtor, surety or guarantor on the instrument — or on the Karta's power to alienate joint family property for legal necessity or for benefit of estate (the first two limbs of Hanooman Persaud Pandey). The third limb is closed.

This shift has had the practical effect of reshaping how lenders structure family-business borrowings. Pre-2005, a loan to the karta-father was, in practice, secured by the entire coparcenary corpus through pious obligation; post-2005, it is not. Lenders now insist on personal guarantees from each adult coparcener, or on individual mortgages of identified shares, or on registration of charges that survive the doctrine's withdrawal. The Karta's power of alienation for legal necessity or benefit of estate survives untouched and remains the working source of the family's borrowing capacity. Even maintenance obligations under Hindu Law — for the wife, for unmarried children, for aged parents — were never within the pious obligation framework; they have always rested on independent statutory and customary footings.

Daughter and pious obligation

The 2005 Amendment did two things in parallel. First, by Section 6(1)(a), it conferred coparcenary status on the daughter, equal in degree, kind and incidents to that of the son. The retrospective operation of that grant has been settled by Vineeta Sharma v. Rakesh Sharma, the leading authority discussed in our chapter on the daughter's right in coparcenary. Second, by Section 6(4), it prospectively abolished the pious obligation. The two provisions sit together but their operation is asymmetric.

This asymmetry produces a textual puzzle. Section 6(4) refers only to "son, grandson or great-grandson". It is silent on the daughter, granddaughter or great-granddaughter. Two readings are possible. The orthodox reading is that Section 6(4) is gender-neutral by interpretation: once the daughter is a coparcener under Section 6(1), she stands in the same position as a son, both as to coparcenary rights and as to coparcenary liabilities, and Section 6(4) operates equally on both. The competing literal reading is that the daughter was never under a pious obligation in the classical doctrine — the doctrine itself was male-coded — so she neither acquires nor loses anything by the 2005 abolition. On either reading the result for post-2005 debts is the same: the daughter cannot be proceeded against on pious obligation. For pre-2005 debts, however, the position is more contested, and the cleaner orthodox reading takes the daughter's coparcenary share as equally exposed to the father's pre-2005 debt as the son's share is — though, as a matter of authority, the question awaits a clear Supreme Court ruling.

Doctrine, contract and execution — locating pious obligation in the wider law

It is helpful to locate pious obligation in the wider law of debts. It does not arise out of contract — Section 53 of the Indian Contract Act and the principles of privity have no operation. The son is not a contracting party; he is a member of the joint family on whose share the doctrine operates. It is not a doctrine of agency; the father is not the son's agent for the purpose of incurring personal debts. It is not a doctrine of suretyship; the son does not undertake to be answerable. It is a personal-law doctrine peculiar to the Mitakshara family — a rule about the family's responsibility for the head's debts, founded in Sastric duty. The Mitakshara and Dayabhaga schools diverge sharply here: the Dayabhaga, which does not recognise survivorship and treats the son as taking his share only on the father's death, never had a working pious obligation doctrine of the same shape.

The procedural consequence is that, pre-2005, the creditor could obtain a personal decree against the father and execute it against the entire coparcenary corpus, including the sons' shares, even though the sons were not parties to the suit. Section 60 of the Code of Civil Procedure permitted attachment of property liable in execution; pious obligation supplied the substantive rule that brought the sons' share within Section 60's reach. Post-2005, that interaction is severed for new debts. The sons' share is no longer liable in execution merely because the father's debt is unsatisfied; the creditor must independently establish a contractual claim against the sons or an alienation by the Karta supported by legal necessity or benefit of estate.

Decline and rationale for abolition

The 174th Report of the Law Commission of India and the Statement of Objects and Reasons of the 2005 Amendment Bill identified the pious obligation doctrine as an obstacle to women's equality and a relic of an earlier social order. The Commission noted that the doctrine, by treating the son's coparcenary share as a security for the father's personal debts, effectively gave the father a disposition power over property in which his sons had a vested interest from birth — a power exercised without their consent and without their knowledge. The doctrine was also one-sided: the daughter, who was not a coparcener pre-2005, took nothing from it; the son, who was, took only the burden. Read together with the object and scheme of the Hindu Succession Act, the abolition completed a long process of equalisation across the Code's chapters.

The Amendment therefore moved on two fronts at once. It made the daughter a coparcener (Section 6(1)) and it abolished the pious obligation (Section 6(4)). Together these two changes brought the daughter inside the coparcenary for the purposes of taking, and removed the historical disability that the son carried for the purposes of giving — equalising the position of male and female coparceners as far as the new statute could.

Why prospective abolition rather than full retrospective wipe? Because the doctrine had operated for over a century, and many debts had been contracted on the faith of it. Lenders had advanced money to fathers in the expectation that the family corpus would secure it. Alienations had already been made by Kartas to discharge such debts. To strip these arrangements of their effect overnight would be to upset settled commercial and proprietary expectations and would have raised serious vested-rights concerns. The transitional saving in the proviso to Section 6(4) addresses exactly this — it preserves the creditor's accrued right against pre-9-September-2005 debts and it preserves the validity of alienations already made.

Continuing relevance

The doctrine is therefore not gone. It continues to operate in three classes of cases. First, every unsatisfied debt contracted before 9 September 2005 remains enforceable against the son, grandson or great-grandson on the strength of pious obligation, subject to the antecedence and non-tainted conditions. Second, every alienation made before or after 9 September 2005 in respect of or in satisfaction of a pre-9-September-2005 debt remains valid. Third, the doctrine's underlying conditions — antecedence, non-tainted character, vyavaharika versus avyavaharika — continue to matter for any litigation involving a pre-Amendment debt.

Three decades of pre-2005 debts are still working through the courts. Limitation periods have not yet exhausted all of them. A mortgage of 1995 may be the subject of a 2026 suit; a 2003 promissory note may surface in execution proceedings today. The pre-Amendment rules on succession to female Hindus have similar transitional features for property dispositions made before the relevant cut-off. The transitional saving keeps the old doctrine alive for that closing tail of cases. For the exam, this means that the entire pre-2005 corpus of pious-obligation case law remains examinable — Brij Narain, Suraj Bunsi Koer, Sidheshwar Mukherjee, Jakati, Faquir Chand, Pannalal, Masit Ullah, V.D. Deshpande — and is not made obsolete by Section 6(4).

The doctrine and partition

The pious obligation doctrine has a particular interaction with partition of joint family property. Where the father contracts a debt before partition, the sons remain liable on partition for that pre-partition debt, provided the debt is not tainted and provided the partition arrangement makes no provision for its discharge. The rule is subject to a procedural limitation: where a decree has been obtained against the father alone before partition, it can be executed against the sons' separated shares; but where the suit is filed against the father after partition, a separate suit against the sons is necessary, and a decree obtained against the father in such a post-partition suit cannot be directly executed against the sons' separated shares without making them parties.

Where the debt is contracted after partition, by contrast, the doctrine does not apply at all. The son is no longer in coparcenary with the father; the father's post-partition debt is a stranger debt as far as the son is concerned. This is well-settled law and it survives the 2005 Amendment for any pre-2005 debt that was contracted post-partition. Readers should keep in mind that partition under Hindu Law has its own settled rules, including modes, reopening and reunion, and the interaction between partition and pious obligation is one of the recurring fact-patterns on judiciary papers.

Burden of proof and tainted debts

The burden of establishing taint is on the son. Proving the father's general bad character is not enough; the son must establish a connection between the specific debt borrowed and the immoral activity. Direct evidence is preferable; circumstantial evidence is admissible, and is often more telling because it cannot lie. The standard is balance of probabilities — the test of civil cases — but the connection must be real, not speculative. A debt contracted by the father during a period of established gambling, with the proceeds traceable to gambling expenditure, will be held tainted; a debt contracted in the same period whose proceeds went to family expenses will not. A useful preliminary check is to ask whether the borrowing satisfied the test of legal necessity — a topic developed in the chapter on disqualifications from succession insofar as immorality and conduct can also bar a successor from inheriting altogether.

The leading line of authority for the burden-of-proof rule runs from the colonial-era cases through to Jakati and the post-Independence Supreme Court decisions. The pre-2005 case law on burden of proof remains authoritative for any pre-2005 debt being litigated today, and the same evidentiary discipline that applied to a 1985 mortgage applies to one being litigated in 2026.

MCQ angle and exam discipline

Five points repay memorisation for the exam. First, the doctrine attaches only to the father's (or grandfather's, or great-grandfather's) debt, never to a collateral's. Second, it requires antecedence in fact and in time — not contemporaneity with the alienation. Third, it does not bind sons for avyavaharika debts, the test of which was settled in Jakati. Fourth, the son's liability is real, not personal — confined to his coparcenary interest, as held in Sidheshwar Mukherjee. Fifth, the 2005 Amendment by Section 6(4) prospectively abolished the doctrine — debts of 9 September 2005 or later are out, debts of before that date are still in. The five propositions of Brij Narain and the three limbs of Hanooman Persaud Pandey are perennial favourites and should be retained verbatim. Aspirants should pair this with their reading of the sources of Hindu Law — Shruti, Smriti, custom and precedent — because pious obligation rests squarely on the Smriti foundation that the Mitakshara commentaries built upon.

Distinctions to keep crisp: pious obligation versus legal necessity (the first is peculiar to a father; the second is common to every Karta); pious obligation versus benefit of estate (the second requires positive benefit; the first does not); antecedent debt versus contemporaneous debt (a borrowing on the occasion of the very mortgage is not antecedent); avyavaharika versus merely imprudent (only distinct immorality or illegality taints); pre-9-September-2005 debts versus post-2005 debts (the first remain enforceable, the second do not); the doctrine versus the daughter (the orthodox reading reads Section 6(4) as gender-neutral after the 2005 conferral of coparcenary status). Each of these distinctions has appeared, in some form, on judiciary papers across States. They will continue to appear so long as pre-2005 debts remain in litigation, and that tail will run for a generation more.

The landmark cases of Hindu Law on pious obligation — Brij Narain, Suraj Bunsi Koer, Sidheshwar Mukherjee, Jakati, Faquir Chand — are the working repertoire. The 2005 Amendment is the legislative pivot. Together, they are the chapter, and the related provisions on succession to the property of Hindu males and on stridhan and women's property rights complete the picture of how property and liability move between generations under the post-2005 statute.

Frequently asked questions

Does pious obligation still exist after the 2005 Amendment?

Yes, but only for debts contracted before 9 September 2005. Section 6(4) of the Hindu Succession Act, inserted by the 2005 Amendment, prospectively abolished the doctrine: no court can recognise pious obligation as a ground for proceeding against a son, grandson or great-grandson for a debt contracted on or after 9 September 2005. The proviso, however, preserves the creditor's right against pre-9-September-2005 debts and the validity of alienations already made on the strength of such debts. The doctrine is therefore alive for that residual class of pre-Amendment debts.

Is the son's liability under pious obligation personal or limited to joint family property?

It is real, not personal. The Supreme Court in Sidheshwar Mukherjee v. Bhubneshwari Prasad Narain (1953) clarified that the son's liability is confined to his interest in the coparcenary property. The creditor of the father cannot proceed against the person of the son, nor against his separate property or self-acquisitions. Where there is no joint family property, there is no liability. This proprietary character of the doctrine has been settled since the British Indian courts adapted the Sastric rule to a property-law footing.

What is an antecedent debt under the Brij Narain rule?

An antecedent debt is a debt antecedent in fact as well as in time — that is, truly independent of the alienation it is said to support, not part of the same transaction. Brij Narain v. Mangla Prasad (1924) settled that an alienation by a father of joint family property to satisfy his antecedent debt binds the sons; an alienation that arises out of the very transaction creating the debt does not. A loan advanced on the occasion of the mortgage that secures it is not antecedent — the borrower's prior independent debt is what the doctrine requires.

What makes a debt avyavaharika so as not to bind sons under pious obligation?

An avyavaharika debt is one a decent and respectable man, acting within law and ordinary morality, would not have contracted — a debt contracted for gambling, drink, lust, the perpetration of crime, criminal breach of trust, or a similarly distinct immorality or illegality. The Supreme Court in S.M. Jakati v. S.M. Borkar (1959) explained the test: the taint must go to the root of the transaction, not be a mere business imprudence. Tagai loans, family-business debts, time-barred promissory notes and arrears of income tax have all been held vyavaharika and binding.

Does Section 6(4) HSA apply to daughters?

Section 6(4) is textually limited to son, grandson and great-grandson. The orthodox reading is that it operates gender-neutrally by interpretation: once the daughter became a coparcener under Section 6(1)(a) of the 2005 Amendment, she stands on the same footing as a son both for coparcenary rights and for coparcenary liabilities. The competing literal reading is that the classical doctrine never applied to daughters and Section 6(4) is therefore a non-issue for them. On either reading, post-9-September-2005 debts cannot be enforced against a daughter on pious obligation; the position for pre-Amendment debts awaits a clear Supreme Court ruling.

Can pious obligation be enforced against sons after partition?

Only for pre-partition debts that are not tainted and for which no provision was made at the partition. Pannalal v. Mst. Naraini settled that the son's interest, even after partition, remains liable for the father's pre-partition debt where the partition arrangement made no arrangement for its discharge. A debt contracted by the father after partition does not engage the doctrine at all — by then the son is no longer in coparcenary with the father, and the post-partition debt is a stranger debt for him.