Definition
Testacy is the condition of dying with a valid will in place. A person who dies in a state of testacy — a testator — has successfully executed a legally recognized instrument directing the disposition of their estate. Testacy is the baseline assumption of estate planning and the governing condition for probate proceedings when a will exists. It stands in direct opposition to intestacy, the condition of dying without a valid will, which triggers statutory default rules for distributing a decedent's property.
The term is almost exclusively a status descriptor. It does not carry procedural content on its own but determines which legal regime applies to a decedent's estate — testate succession (governed by the will) or intestate succession (governed by statute).
Common Confusion
Testacy is sometimes loosely equated with having made a will, but the two are not identical. A person may have executed a will and still die intestate if that will is successfully challenged, revoked, or found invalid. Testacy depends on the validity of the will at the moment of death, not merely on the act of will-making. Researchers encountering references to "the decedent's will" in older probate records should not assume testacy was established without checking whether the instrument was admitted to probate.
Testacy should also not be confused with testation, which refers to the act of making a will, or with testamentary capacity, which refers to the legal and mental qualifications required to execute a valid will.
Why It Matters in Research
Testacy functions as a gateway concept in probate and succession research. Its primary research value lies in orientation: when a source or case turns on whether testacy was established, the downstream legal questions — who administers the estate, how property passes, which creditors are paid in what order — all depend on resolving that threshold question.
In historical sources, testacy proceedings were sometimes called "proving the will" or "probate of the will," and the term testacy itself appears rarely in older court documents. Researchers working in 18th- and 19th-century probate records will more often encounter the functional equivalent through phrases like "letters testamentary" (issued when testacy was established) versus "letters of administration" (issued when intestacy controlled). The presence or absence of these instruments in an estate file is often the best proxy for testacy status in historical records.
Partial testacy is a condition worth flagging for corpus researchers: a will may be admitted to probate for some assets while intestacy governs others — for instance, when a will disposes of real property but is silent on personal property, or when a residuary clause is contested. Modern statutes often address this explicitly, but historical treatment varied considerably, and older sources may treat partial testacy inconsistently or not at all.
Because testacy and intestacy are paired concepts that anchor the entire field of succession law, sources indexed under one term frequently bear directly on the other. Researchers should treat any search on testacy as incomplete without a parallel search on intestacy and on the procedural mechanisms — probate, will contests, revocation — that determine which status applies.
Historical Dictionary Support
The three historical dictionary sources — Black's (both editions) and Bouvier's — are in complete agreement and nearly identical in language: testacy is the state or condition of leaving a will at one's death, opposed to intestacy. This unanimity reflects the term's status as a straightforward binary descriptor with no contested meaning in legal usage. Webster's 1913 and Wiktionary align precisely with the legal definitions, which is notable; the common and legal meanings of testacy have never meaningfully diverged.
What the historical dictionaries do not address is the complication of partial testacy or the procedural mechanisms by which testacy is legally confirmed. They treat testacy as a condition established by the fact of a valid will, without engaging the question of what happens when validity is disputed. For research purposes, this gap is significant: the historical sources reflect testacy as a concluded status, not as a contested question — and contested testacy is precisely where most litigation in this area arises.
Jurisdictional Note
The basic definition of testacy is uniform across common law jurisdictions. However, the procedural requirements for establishing testacy — the formalities required for a valid will, the standard of proof in will contests, and the consequences of partial testacy — vary by jurisdiction and have changed substantially over time. Researchers working across multiple jurisdictions or historical periods should not assume uniformity in what counts as a valid will sufficient to establish testacy.