Definition
To accelerate, in law, means to cause a right, obligation, or interest to become due, enforceable, or possessory sooner than it would otherwise occur under the original terms or natural course of events.
The term operates in two distinct legal contexts:
1. DEBT AND CONTRACT: To make the entire outstanding balance of a debt immediately due and payable upon the occurrence of a specified triggering event — most commonly a borrower's default. An acceleration clause in a promissory note or mortgage empowers the lender to declare all future installments immediately owed rather than waiting for each payment to come due in sequence.
2. PROPERTY AND FUTURE INTERESTS: To advance the vesting of an interest in property. When an intervening interest fails — for example, when a life tenant dies prematurely, disclaims, or forfeits the estate — the remainder or next successive interest accelerates into possession ahead of the originally anticipated schedule.
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Common Language
Modern common usage (Wiktionary): Accelerated; quickened; hastened; hurried.
Historical common usage (Webster's 1913): To cause to move faster; to quicken the motion of; to hasten the occurrence of an event.
The common meaning captures the general sense — speeding something up — but obscures the legal precision. In law, acceleration does not merely mean something happens faster. It means a specific legal right or obligation becomes immediately enforceable or possessory as a matter of legal operation, often triggered by a defined condition. A lender does not simply "hurry" repayment; the lender invokes a legal mechanism that collapses a future payment schedule into a present, matured obligation. The distinction between quickening a process and extinguishing the original schedule entirely is legally significant.
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Common Confusion
Acceleration is sometimes conflated with acceleration clause (the contractual provision authorizing it) and with default (the triggering event). These are distinct: default is the condition, the acceleration clause is the authority, and acceleration is the act. In property law, acceleration of a remainder is also sometimes confused with vesting — an interest may have already vested in interest while remaining subject to acceleration only in possession.
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Recognized Forms
/SUBTYPES
ACCELERATION OF DEBT: Triggered by borrower default, breach of covenant, insolvency, or a due-on-sale provision. The lender exercises the right under an acceleration clause, making the full principal balance immediately due. Foreclosure proceedings typically follow if the debt is not cured or paid.
ACCELERATION OF FUTURE INTERESTS: Occurs by operation of law when a preceding estate or interest fails. A remainder accelerates when the life estate it follows terminates earlier than expected — whether by death, disclaimer, or forfeiture. Courts have historically scrutinized whether the testator's or grantor's intent supports acceleration when the preceding interest fails by disclaimer rather than natural termination.
ACCELERATED DEPRECIATION: In tax and real estate contexts, a method of depreciating an asset at a faster rate than straight-line depreciation, front-loading deductions in earlier years. This usage is statutory and administrative rather than doctrinal.
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Why It Matters in Research
Researchers encounter acceleration across multiple practice areas that do not always cross-reference each other. The debt-acceleration context dominates transactional and foreclosure materials; the property-interests context lives primarily in estates, trusts, and future interests doctrine. A researcher working in one area may miss governing principles developed in the other.
In foreclosure research, pay close attention to whether acceleration has actually been exercised and whether a right to cure or reinstatement period applies. Many jurisdictions impose procedural requirements — notice, waiting periods — before acceleration is effective. Historical sources often omit these procedural prerequisites, reflecting an era when acceleration was more strictly a private contractual right with fewer statutory overlays.
In future interests research, acceleration doctrine involves a contested interpretive question: does the court accelerate the remainder automatically when a life estate fails, or does it first ask whether acceleration conforms to the grantor's intent? This question is treated inconsistently across jurisdictions and time periods. Restatement provisions and treatises from the mid-twentieth century introduced intent-based analysis that older sources do not reflect.
The tax-law usage of "accelerated depreciation" is terminologically related but analytically separate. Do not carry debt or property doctrine into the tax context without independent research into the applicable statutory scheme.
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Historical Dictionary Support
Anderson's definition — "to shorten the period after which an interest or estate is to vest in possession or enjoyment" — reflects the property law usage almost exclusively, which was the dominant doctrinal treatment in late nineteenth-century legal dictionaries. The definition is accurate within its scope but incomplete for modern research purposes: it does not address acceleration of debt, which had become commercially significant by Anderson's era and has since become the more frequently litigated context.
The omission is telling. Nineteenth-century legal dictionaries tended to organize contract and property concepts separately, and the consolidation of "acceleration" as a cross-domain legal term came largely through the standardization of commercial lending documentation in the twentieth century. Researchers using only Anderson or contemporaneous sources may find adequate support for the property interest usage but will need to look to later commercial law sources for debt acceleration doctrine.
No significant divergence among historical sources on the property-interests meaning; the core concept of advancing possession upon failure of a preceding interest has been stable.
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Jurisdictional Note
In the debt-acceleration context, state law governs both the enforceability of acceleration clauses and any statutory right to cure default before foreclosure proceeds. Some states require formal notice of acceleration as a condition precedent to foreclosure; others treat lender conduct (such as filing suit) as constructive acceleration. These variations are procedurally significant and must be researched by jurisdiction.
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Encyclopedia Cross-Reference
Foreclosure -- Overview, Default, Acceleration, and the Right to Cure (realestate_42)
Promissory Notes -- Terms, Acceleration Clauses, Due-on-Sale, and Negotiability (realestate_26)
Cost Segregation -- Accelerated Depreciation Through Engineering-Based Component Analysis (realestate_84)
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