Definition
A post obit bond is a financial instrument by which a borrower — typically an heir or beneficiary with expectations under a will or inheritance — promises to repay a loan at a sum exceeding the principal (and usually exceeding lawful interest rates), contingent on the borrower surviving the person from whose estate the borrower expects to inherit. Payment becomes due on or after the death of that anticipated benefactor. The bond is, in essence, a bet on mortality: the lender advances present cash, the borrower pledges future inheritance proceeds, and the repayment obligation crystallizes only when the expected estate passes.
The term derives from the Latin post obitum, meaning "after death," which names the defining condition of the instrument's enforceability.
Common Language
Modern common usage (Wiktionary): Not defined as a common English term; the phrase has no general popular usage outside legal and historical financial contexts.
Historical common usage (Webster's 1913): Webster's 1913 does not include an entry for "post obit bond" as a standalone term, though "post obit" appears as a legal Latinism meaning "taking effect after death."
The phrase carries no ordinary English meaning independent of its legal context. A researcher encountering "post obit" in a historical document should not interpret it through any general sense of the word "bond" (as in connection or obligation) but rather as a specific debt instrument of the expectant-heir transaction type, with its own legal treatment in equity courts.
Common Confusion
Post obit bonds are sometimes confused with promissory notes or ordinary loans secured against future income. The critical distinction is twofold: (1) repayment is contingent on survival of the borrower past a specific person's death, not merely deferred; and (2) equity courts historically scrutinized these instruments for unconscionability because the lender's leverage over an expectant heir — who often had no present assets and urgent need for cash — created a recognized opportunity for exploitation. An ordinary promissory note carries no such contingency and was not subject to the same equitable oversight.
Why It Matters in Research
Post obit bonds appear most frequently in equity jurisprudence from the eighteenth and nineteenth centuries, particularly in chancery cases involving unconscionable bargains with expectant heirs. Courts of equity developed a doctrine — sometimes called the "catching bargain" doctrine — under which contracts made with reversioners or expectant heirs for inadequate consideration could be set aside. Post obit bonds were the paradigm instrument in this line of cases.
Researchers working in American legal history should note that the doctrine was applied unevenly across states. Some jurisdictions followed English equity doctrine closely; others treated post obit bonds more like ordinary contracts subject only to usury law analysis. The usury dimension is also significant: because the repayment sum typically exceeded the lawful interest rate, these instruments were sometimes challenged on usury grounds independently of equitable unconscionability arguments. The interaction between usury statutes and equity doctrine in historical sources is not always cleanly distinguished, and researchers should be attentive to which ground a court is actually deciding on.
In English sources, the leading authority is Chesterfield v. Janssen (2 Ves. Sr. 125), cited by Burrill, which established the foundational equity analysis. American cases applying or distinguishing this framework — including Crawford v. Russell, 62 Barb. (N.Y.) 92, and Boynton v. Hubbard, 7 Mass. 119, cited by Black's second edition — show how American courts adapted the English equity approach to local conditions and statutory usury regimes.
Post obit bonds are largely obsolete as a transactional form in modern American practice, displaced by more sophisticated estate planning tools and lending products. A researcher encountering the term in contemporary materials is almost certainly dealing with historical litigation, estate disputes, or scholarly treatment of the expectant heir doctrine rather than a live transaction.
Historical Dictionary Support
Black's first and second editions are in close agreement, defining the post obit bond as a bond given by an expectant heir to become due on the death of the anticipated benefactor, involving repayment of a sum exceeding the legal rate of interest. The second edition adds two American case citations, grounding the definition in domestic authority rather than relying solely on Chesterfield v. Janssen.
Burrill's definition aligns with Black's but is more explicit in identifying the Latin origin (post obitum) and cites Wharton's Law Lexicon as an intermediate authority, placing the instrument in a trans-Atlantic scholarly chain. Burrill also references Chesterfield v. Janssen directly, which is significant: that case is the fountainhead of equity's special treatment of expectant-heir bargains, and its citation signals that Burrill understood the post obit bond not merely as a debt instrument but as a doctrinal category.
None of the historical dictionaries address the decline of the instrument or its interaction with statutory reform. Nineteenth-century usury law changes, and later the development of modern probate and trusts practice, rendered the post obit bond increasingly rare, but the dictionaries reflect the era when it was still a live concern. Researchers should not assume that the dictionary definitions capture the full doctrinal complexity — the equity case law elaborates considerably on when and how courts would intervene.
Jurisdictional Note
English equity courts developed the most elaborate doctrine around post obit bonds, and English authorities dominate the historical secondary literature. American jurisdictions varied significantly in how far they followed the catching bargain doctrine: New York and Massachusetts courts addressed the instrument (as the Black's citations reflect), but not all states developed a robust independent body of case law. Researchers working outside New York, Massachusetts, or federal equity jurisdictions should verify whether local courts treated post obit bonds under usury statutes alone or also applied equitable unconscionability analysis.