How the Rule Against Perpetuities Works

The rule against perpetuities can affect how long certain future interests in property may remain unresolved. For estate planning, that can become relevant when a will or trust places conditions on when future beneficiaries receive an interest. The traditional rule is often associated with a period measured by a relevant person’s lifetime plus 21 years, but state law has changed considerably. Some states retain versions of the traditional rule, others provide longer statutory periods and some have removed it for certain trusts or property interests. Anyone planning a transfer that could extend across multiple generations should check the law governing the estate or trust rather than relying on a single nationwide timeframe.

If you find writing a will is complicated, considering working with a financial advisor.

What Is the Rule Against Perpetuities?

The traditional rule places a deadline on the uncertainty surrounding certain future rights to property. Its calculation starts with a relevant person who is living when the arrangement takes effect and extends for 21 years beyond that person’s lifetime. A future right that cannot satisfy this timing requirement may be invalid. The focus is on when the legal right becomes definite under the arrangement’s terms, which is not necessarily the same date that someone receives the asset.

State statutes can produce a different result. For example, Virginia’s current statutory rule recognizes both the traditional lifetime-plus-21-years test and an alternative 90-year period. Virginia also now allows a 1,000-year alternative for personal-property (not real property) trusts created on or after July 1, 2024. ¹ Nevada uses the traditional test as one option but provides a 365-year alternative. Delaware has separate rules for property held in trust, including provisions that remove the common-law restriction for certain interests.

Consider Anne, who owns a vineyard and wants it to remain in her family. She leaves an interest to her son John and provides that John’s children will receive another interest after satisfying a future condition. Whether that arrangement creates a perpetuities problem depends on the precise wording of the transfer and the law that applies. A condition that would violate the traditional rule could receive different treatment in a state that has adopted a longer statutory period or an applicable exception.

That distinction makes the original estate document particularly important. The ages of beneficiaries, conditions attached to a gift, powers granted under a trust and applicable state law can all affect whether a future interest is valid.

History of the Rule Against Perpetuities

The doctrine traces back to English courts that developed restrictions on certain future interests in property. It later became part of American law, where individual states eventually began replacing, revising or creating exceptions to the earlier common-law framework.

One significant development was the adoption of statutory alternatives to the traditional common-law test. In some jurisdictions, a future interest is not rejected solely because the original terms create a theoretical timing problem. State law may instead allow the actual sequence of events to determine whether the interest becomes valid within the applicable period. Other states have extended the permitted period substantially or created exceptions that can support much longer trusts.

State law in 2026 varies widely in both the duration allowed and the types of arrangements covered. Kansas, for instance, provides a statutory alternative period of 90 years while carving out certain qualifying trusts. Other jurisdictions have adopted different periods or exceptions, so the treatment of a long-term property interest can change depending on which state’s law governs it.

What Is the Wait-and-See Rule?

Under a wait-and-see system, the validity of a future interest can depend on events that unfold after the interest is created. Rather than deciding at the outset based solely on a hypothetical event that could occur too late, the applicable period provides an opportunity for the contingency to be resolved.

The available timeframe is not uniform nationwide. Florida, North Carolina and Virginia, for example, have statutory provisions that include a 90-year alternative for certain nonvested property interests. Nevada instead provides an alternative period of 365 years. These differences make a blanket statement that every state using a statutory approach allows exactly 90 years inaccurate.

Returning to Anne’s vineyard, a future interest that creates a problem under the traditional test might still survive under an applicable statutory alternative if the required event occurs within that state’s permitted period. The actual outcome would depend on the governing law and the terms of the transfer.

What Is Vesting and Why Does It Matter?

For purposes of this rule, vesting concerns the point at which uncertainty over a future property right is resolved under the governing legal conditions. It does not necessarily coincide with the date someone takes possession or begins using the asset. An estate document can make a future right depend on a later occurrence, such as reaching a particular age or surviving another individual.

In the vineyard scenario, John’s interest and the future interests created for his children would have to be examined separately. A provision granting John’s children an interest only after a stated condition occurs could raise a perpetuities issue if there is a possibility that the condition will remain unresolved beyond the period permitted under the governing law.

This is why the timing language in a will or trust can carry significant legal consequences. A provision designed to keep an asset within a family for decades may operate differently depending on the type of interest created and the state’s rules.

How the Rule Can Affect Your Estate Plan

For most people, the practical issue is not memorizing the perpetuities formula. It is recognizing when an estate plan tries to control property for a long period after the owner’s death. Provisions involving grandchildren or later generations, age requirements, long-term trusts and conditions on future ownership deserve particular attention.

Review the governing law before assuming that a trust can last for a specific number of years. State rules can differ even when two jurisdictions both use a statutory rule against perpetuities. Nevada’s statute, for example, permits a much longer alternative period than the 90-year framework found in states such as Virginia and North Carolina. Delaware takes another approach for certain property placed in trust.

The financial consequences also extend beyond the duration of the trust. A multigenerational estate plan can involve estate and gift taxes, generation-skipping transfer taxes, income taxes, trustee expenses and investment decisions. A structure that is permitted to last for decades or longer is not automatically the most appropriate or cost-effective choice for a family.

Before transferring substantial assets into a long-term trust, consider what you actually want the arrangement to accomplish. Providing for children or grandchildren, protecting particular property and controlling the timing of distributions can call for different legal structures. An estate planning attorney can draft the documents and evaluate the applicable property and trust law, while a financial advisor can help assess the assets, cash flow and investment considerations involved in the plan.

Bottom Line

The rule against perpetuities can restrict how certain future property interests are structured, but there is no single rule that applies identically across the United States in 2026. Some states retain a 21-years-after-a-relevant-life framework, statutory alternatives can provide much longer periods and certain jurisdictions exclude particular trusts or interests altogether. Estate plans intended to control property across generations should therefore be reviewed under the law that actually governs the transfer rather than relying on a general national rule.

Tips for Estate Planning

• Writing a will is often the most complicated part of planning your estate. Working with an estate planning professional like a financial advisor is crucial to ensuring your wishes for your property and heirs are valid. SmartAsset’s free tool matches you with financial advisors who serve your area, and you can interview your advisor matches at no cost to decide which one is right for you. If you’re ready to find an advisor who can help you achieve your financial goals, get started now.
• If you haven’t given thought to your will, it’s recommended to have an idea of your intentions for your wealth before contacting a professional. In our guide, we walk you through how to get started with writing your own will. While this won’t substitute for consulting an attorney, it will give you a great place to start the conversation.

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