The rule against perpetuities is a foundational doctrine in property law that courts use to limit how far into the future property interests can be delayed from taking effect. It aims to keep property markets flexible and prevent ownership from being locked in by stale, remote contingencies.
Designed to curb uncertainty around vesting, this rule shapes how trusts, estates, and transfers are drafted and interpreted. The following sections outline its mechanics, policy impact, and practical guidance for practitioners.
| Key Element | Definition | Effect If Violated | Common Example |
|---|---|---|---|
| Measuring Lives | Identified individuals whose lifespan controls the timing window | Interests must vest or fail within 21 years after the last measuring life dies | A child alive at the testator’s death |
| Contingent Remainders | Future interests subject to an unresolved condition | Invalid if they might vest more than 21 years after a life in being | To A if B graduates law school |
| Vesting Period | Time frame by which ownership must crystallize | Automatic invalidation for interests violating the rule | 21 years after the death of the last life in being at the creation |
| Savings Statute | Modern legislation in many jurisdictions that overrides common law rules | Reformed or abolished traditional perpetuities analysis in favor of clearer rules | UTC 20-1-103 specifying a 90-year validity horizon |
Identifying Lives in Being at Creation
The Role of Lives in Being
Courts examine all individuals alive at the time the interest is created to define the outer boundary for vesting. Any possible vesting beyond 21 years after the last of these lives ends invalidates the contingent interest under the common law rule.
Testing Remote Possibilities
Even unlikely scenarios in which an interest might vest too late are enough to trigger a violation. Drafting must ensure that no condition, whether human or corporate, can postpone transfer beyond the permissible horizon.
Common Law Rule Against Perpetuities
Traditional Application
Under the common law, an interest is void if there is any possibility, however remote, that it could vest more than 21 years after the death of a life in being at the creation of the interest. This strict approach encourages prompt vesting and reduces litigation over ancient dead-hand control.
Drafting Implications
Lawyers avoid language that ties vesting to events that may occur generations later, such as the birth of distant descendants or the sale of a third-party business. Precision in conditions precedent and fallback provisions is essential to survive scrutiny.
Modern Statutory Reforms
State-by-State Variations
Many jurisdictions have replaced or narrowed the common law rule with statutes that provide clearer time frames, such as 90-year or 120-year horizons. These reforms reduce complexity while still curbing excessively delayed vesting.
Uniform Statutory Rule Against Perpetuities
The Uniform Statutory Rule Against Perpetuities offers a predictable alternative by validating interests that vest or terminate within 90 years of creation. Adoption varies, and counsel must confirm local rules before relying on this framework.
Drafting Strategies to Comply
Alternative Future Interests
Using executory interest language, shifting executory limitations, or designating default beneficiaries can channel property to intended recipients without stretching the vesting timeline.
Use of Trusts and Powers of Appointment
Trust structures that include limited powers of appointment or administrative mechanisms can preserve flexibility while keeping interests within the permissible vesting window.
Key Takeaways for Practitioners
- Always identify all lives in being at the moment the interest is created
- Check local statutes for replacement rules and permissible vesting windows
- Draft conditions with foreseeable satisfaction events to avoid remote vesting
- Structure trusts with administrative mechanisms that keep interests within limits
- Test complex plans against both common law and statutory alternatives
FAQ
Reader questions
Is the rule against perpetuities still relevant in states with modern statute reforms?
Yes, even in reformed jurisdictions, the underlying policy of preventing remote vesting continues to shape drafting practices, and counsel must follow local time limits.
Can charitable trusts escape the rule entirely?
Charitable trusts are often exempt or treated differently, but private trusts must still satisfy vesting requirements to avoid invalidation under the rule.
What happens if an interest is void under the rule at common law but valid under a modern statute?
The statutory provision typically applies, transforming an invalid common law interest into a valid future interest if it complies with the new time frame.
Do mergers or cy-prés help when an interest violates the rule?
Courts may apply cy-prés to modify charitable gifts, but the rule against perpetuities generally does not allow judicial rewriting of private interests that fail at common law.