Selection of the Payout Mechanism for a CRUT: Term, Life, and the Longer or Shorter of Life or 20 Years

Jurisdiction: Federal

Primary Statutes: IRC §§ 664(d)(1), 664(d)(2), 664(f), 170, 2055, 2056(b)(8), 2501, 2503(b), 2522, 2523(g), 2601, 7520

Key Authorities: Treas. Reg. §§ 1.664-3(a)(5), 1.664-3(a)(3), 1.664-4; Rev. Rul. 77-374, 1977-2 C.B. 329; Rev. Proc. 2016-42, 2016-34 I.R.B. 269; Rev. Procs. 2005-52 through 2005-59; IRS Pub. 1458 (Actuarial Valuations); Table 2010CM

Last Reviewed: June 2026

Category: Charitable Planning -- CRUT Design

At a Glance

The four payout periods a CRUT can use

• Term of years. A fixed period, capped at 20 years, that runs regardless of who is alive.

• Life (one or more lives, commonly one or two). Payments run until the death of the measuring life, or the last death where more than one life is named.

• Shorter of life or a term. Payments end at the earlier of the term's expiration or death.

• Longer of life or a term. Payments end at the later of the term's expiration or death, so an early death routes the balance of the term to heirs.
  

All four are structurally permissible -- the one combination the regulation forbids is different

• Treas. Reg. § 1.664-3(a)(5) authorizes a life or lives, a term not exceeding 20 years, and the "whichever is longer" or "whichever is shorter" hybrids of the two, provided the trust otherwise satisfies § 664. A calculator offering these options is not the authority for them; the regulation is.

• What fails is a period that can extend beyond both the measuring lives and the 20-year cap -- for example, "to A for life, then to B for a term of years." That structure can outlast both limits. The longer-of and shorter-of hybrids never do.

The actuarial headline, including a point that runs against intuition

• Term is the only option whose 10% remainder test is indifferent to age. Life, and the life leg of either hybrid, put life expectancy at the center of qualification.

• Shorter-of produces the smallest income interest and the largest remainder of any structure, so it clears the 10% test most readily at every age.

• Longer-of qualification is a young-donor problem, not an old-donor one. As the donor ages, the longer-of remainder rises and the test gets easier, eventually converging on the favorable 20-year term value. Older donors can often raise the payout rate rather than trim it.

The short answer. Choose the payout period by asking two questions in order. First, what does the donor actually want -- lifetime income security, a finite funding window, or a stream that protects heirs against an early death? Second, does the resulting remainder clear 10% at the donor's age and target payout? The first question selects among term, life, shorter-of, and longer-of on their merits. The second is a number you run on a calculator, and it constrains younger donors far more than older ones.

Executive Summary

The CRUT statute states the payout period in a single disjunctive: the unitrust amount is paid "for a term of years (not in excess of 20 years) or for the life or lives" of individuals living when the trust is created. IRC § 664(d)(2)(A). Most drafters read that sentence as a binary choice between a term and a life. It is not. Treas. Reg. § 1.664-3(a)(5) expressly permits combining a life or lives with a term of up to 20 years, including the formulation "A for life or for a term of years not longer than 20 years, whichever is longer," and the parallel "whichever is shorter." Four options follow, not two: term, life, shorter-of, and longer-of.

The four are not interchangeable. They differ on who the structure protects, on whether anything reaches the donor's family, and on how hard the 10% minimum remainder interest test is to satisfy. The selection is a design decision that should precede drafting, because the wrong period either fails to do what the donor wanted or fails to qualify on the funding date.

One element of the age analysis is counterintuitive and worth stating plainly at the outset, because the opposite is frequently assumed. For the longer-of structure, increasing donor age makes the 10% test easier, not harder. The reason is mechanical and is developed below: the longer-of period is the greater of the life and the 20-year term, and as the measuring life ages the fixed term increasingly drives the valuation, pulling the remainder up toward the favorable term-certain value. The difficulty of qualifying a longer-of CRUT therefore falls as the donor ages and plateaus at the 20-year value, rather than rising.

The Four Options

The graphic below shows how each period behaves under two outcomes -- an early death at year 12 and a long life to year 27 -- measured against a 20-year term cap. The detail is in the text that follows; the figure is the mental model.

Teal marks payments to the income beneficiary; amber marks the balance of a guaranteed term paid to heirs after an early death. The dashed line is the 20-year term cap; the dotted line is the death of the measuring life. Left column: death at year 12. Right column: a life reaching year 27.

Term of years

A fixed term of up to 20 years buys predictability and decouples the structure from anyone's lifespan. For self-provision it is the weakest of the four against longevity, because payments stop at the term even if the beneficiary is alive and still needs income, so it suits a defined funding window -- a bridge to Social Security, a child's college years -- rather than lifetime security. For family it is unexpectedly strong, because death does not end the stream: the balance of the term runs to the donor's estate or named heirs, and those successor recipients need not be living at inception. Actuarially it is the cleanest to qualify at any age, because the 20-year remainder factor turns only on the § 7520 rate and the payout percentage. A 45-year-old and a 65-year-old face the identical 10% test. Only an aggressive payout breaks it: for a 20-year term-certain CRUT the 10% remainder threshold sits at roughly a 10.875% adjusted payout rate. The test runs on the adjusted payout rate, which Treas. Reg. § 1.664-4 derives from the stated percentage through the Table F frequency-and-timing adjustment, so test the stated rate rather than assume it.

Life (one or more lives, commonly one or two)

A life interest, usually on one or two lives but not capped at two, is the purest self-provision instrument, because the beneficiary cannot outlive it. That same feature makes it the weakest vehicle for passing the income stream to family: at the last death the payments stop and the remainder goes to charity, so heirs receive nothing from the trust, and a two-life version protects only the surviving spouse, not the children. Actuarially, age dominates, and it works in the donor's favor as age rises. A donor in the 40s carries a long expected payout that depresses the remainder and makes the 10% test hard, so a high rate can fail and force a reduction. The 50s leave more room, and by the 60s the shorter expectancy lifts the remainder comfortably past 10% at ordinary rates and opens payout headroom. Two young lives are the worst case, because the joint-and-survivor expectancy stretches the income interest further still.

Shorter of life or a term

Paying for the shorter of a term or a life is conservative truncation: it can only shorten the income period below both limits, so it produces the smallest income interest and the largest remainder of any structure. For self-provision that is a drawback, because the beneficiary surrenders lifetime coverage beyond the cap and a long-lived beneficiary loses income at the point of greatest exposure. For family it adds nothing, because it ends at the earlier event and never extends a stream to heirs. Its value is actuarial. It clears the 10% test most readily at every age. (CRAT-only: shorter-of is also the classic fix for a CRAT that fails the 5% probability-of-exhaustion test of Rev. Rul. 77-374; Rev. Proc. 2016-42 sample qualified-contingency language now offers an alternative route. This concern does not arise in ordinary CRUT remainder calculations.) The rescue matters most for younger donors, whose long expectancy creates the qualification problem in the first place, so capping a 45-year-old's life at 20 years pulls the remainder up enough to support a payout a pure-life trust could not carry.

Longer of life or a term

Paying for the longer of a term or a life is the dual-purpose structure: lifetime security plus a guaranteed floor, so an early death still routes the balance of the term to heirs. It is the only option that serves self-provision and family transfer at once, which is its selling point. At any single age it is the most constrained of the four, because the period equals the greater of the life or 20 years, which is the longest income interest and the smallest remainder at that age. But the difficulty falls as the donor ages; it does not rise.

⚠ The intuition that a 20-year floor adds drag at every age is wrong. For a donor in the 40s or 50s, the life component dominates the valuation and the structure behaves much like a pure life -- hard to qualify for the same reason life is hard. (The guaranteed term still carries a small probability-weighted cost, because death before year 20 is possible; it is not literally zero, just minor.) As the measuring life ages, the fixed term increasingly drives the value, and the longer-of remainder rises toward the favorable 20-year term-certain value. By the mid-to-late 60s the test is generally comfortable, and the donor can often raise the payout rate rather than cut it, subject to running the exact numbers.

Longer-of is therefore a young-donor qualification problem, not an old-donor one. The floor that looks like a constraint is, for an older donor, the thing that makes the structure qualify.

Age and the Actuarial Tests

For any single realized lifespan, the two hybrids reduce to clean identities: the shorter-of period is the lesser of the life and 20 years, and the longer-of period is the greater. The valuation, however, does not pick one leg at a hard cutoff. It is a probability-weighted present value across every possible year of death under the § 7520 rate and the Table 2010CM mortality assumptions of Treas. Reg. § 1.664-4, so the remainder factor moves smoothly with age rather than flipping at the age where life expectancy equals 20 years. The identities describe the realized payout; the deduction reflects the whole distribution.

As a teaching approximation, the structures behave like this. A term-certain CRUT is age-independent, because its period is fixed. A shorter-of CRUT behaves more like a 20-year term when the measuring life is young and more like a life interest when the life is older, and it produces the largest remainder of the four for any given set of assumptions. A longer-of CRUT behaves more like a life interest for younger lives and more like a 20-year term for older lives, so its remainder, smallest of the four at a young age, rises toward the term value as the donor ages. The transition is gradual and, in rough terms, gathers pace around the mid-to-late 60s under current IRS mortality; the exact result depends on the § 7520 rate, the payout rate, the payout frequency, the valuation month, and the measuring life or lives.

Donor age band	Term	Life	Shorter of	Longer of
40s (younger lives)	Easy; age-independent	Hard; long expectancy depresses remainder	Easy; behaves like the 20-year term	Hard; behaves like a pure life
50s	Easy; age-independent	Tightening eases; rate may still need trimming	Easy; behaves like the term	Still constrained; life component dominates
60s and beyond (older lives)	Easy; age-independent	Comfortable; headroom opens	Easiest of all; behaves like the life	Comfortable; converges to the term value

The practical instruction follows directly. For a younger donor who needs the 10% test to clear, steer toward a term or a shorter-of structure, because those are the configurations that hold up under a long expectancy. For an older donor, all four qualify, and the selection turns on the donor's goals rather than on the arithmetic. Run the specific numbers in either case; the bands above describe direction, not a substitute for the calculation at the donor's exact age, payout, and § 7520 rate.

Summary Table: The Four Options Across the Dimensions That Matter

Dimension	Term	Life	Shorter of	Longer of
Duration rule	Fixed, ≤ 20 yrs	Until death	Earlier of term or life	Later of term or life
One or more lives	Not applicable	One or more (commonly 1-2)	One or more (commonly 1-2)	One or more (commonly 1-2)
Self-provision against longevity	Weak; stops at term	Strongest; cannot outlive it	Weak; coverage lost beyond cap	Strong; lifetime plus a floor
Provision for heirs	Strong; term balance to heirs	Weakest; nothing after last death	None; ends at earlier event	Strong; term balance to heirs
10% test, cross-section at a fixed age	Age-independent; favorable, though not as favorable as shorter-of	Age-driven	Largest remainder; easiest (same assumptions)	Smallest remainder; hardest
Effect of rising age on the 10% test	No effect	Easier with age	Easier with age	Easier with age; plateaus at term value
Principal watch-out	Includible term interest at donor's death	Two-life covers survivor only, not children	Surrenders lifetime upside	Non-spouse term takers defeat the marital deduction and trigger a completed gift

Governing Framework

The statutory menu and the one prohibited combination

Section 664(d)(2)(A) supplies the raw materials: a term not exceeding 20 years, or one or more lives in being at funding. Treas. Reg. § 1.664-3(a)(5) assembles them into the permissible structures and draws the boundary. The regulation permits a life or lives, a term of years, and the longer-of and shorter-of hybrids. It also permits a life or lives followed by a term limited to the lesser of a successor's life or 20 years, provided all current and successor recipients are living at inception.

The limiting principle is that the payout period "may not extend beyond either the life or lives of a named individual or individuals or a term of years not to exceed 20 years." The regulation's own example of what fails is a payment "to A for his life and then to B for a term of years," because that arrangement can last longer than either A's life or a 20-year term. The longer-of hybrid does not offend this rule. Its period equals the greater of the life or the term, which in every scenario equals one of the two individually permitted measures and never their sum. The shorter-of hybrid is safer still, because it can only truncate the period below both limits. Section 664(f) supplies a related tool: a qualified contingency can terminate payments earlier than they would otherwise end, so long as it cannot extend them beyond the permissible period.

Why the remainder factor rises as the payout period shortens

The 10% test of § 664(d)(2)(D) requires that the present value of the charitable remainder, computed under the § 7520 rate and the actuarial tables of Treas. Reg. § 1.664-4, equal at least 10% of the value contributed -- and the statute applies the test with respect to each contribution, so later additions to an existing CRUT are tested separately under the assumptions for that contribution. The valuation uses the § 7520 rate for the month of the transfer, with an election to use either of the two preceding months' rates. For a CRUT, the remainder behaves like one minus the adjusted payout rate, compounded over the expected number of payout years. Fewer expected years means less compounding erosion and a larger remainder. A shorter payout period is therefore favorable to qualification, and a longer one is adverse.

That single relationship drives the entire age analysis. The term option fixes the payout period at 20 years regardless of age, so its remainder factor is age-independent and turns only on the § 7520 rate and the payout percentage. The life option ties the period to expectancy, which shortens with age, so its remainder rises as the donor ages. The two hybrids inherit the behavior of whichever leg dominates the valuation, and which leg dominates depends on the donor's age. That is the mechanism that makes the longer-of structure easier to qualify, not harder, as the donor grows older.

Multiple lives, the in-being requirement, and the term-balance exception

The life leg of either hybrid can rest on more than one life. Section 664(d)(2)(A) authorizes payment for "the life or lives" of named individuals, with no numeric cap, although standard forms and most planning applications use one life or two. A longer-of or shorter-of structure can be built on a single life or on the two recognized two-life forms, consecutive or concurrent-and-consecutive, each of which runs to the last survivor. Adding lives beyond two, or unusual sequencing, calls for custom actuarial computation and careful testing. Every individual whose life measures the period, including a second life or a successor life recipient, must be living when the trust is created. Treas. Reg. § 1.664-3(a)(3).

The one exception runs to the heirs who take the balance of a guaranteed term under a longer-of structure. Because the term itself, capped at 20 years, is the limiting measure for those payments, the takers of the term balance need not be living at inception. This is the feature that lets a longer-of CRUT route the remaining term payments to children or other family members when the income beneficiary dies before the term expires. That routing is not only a design feature; it is a transfer-tax event. A guaranteed-term balance payable to children, descendants, or other noncharitable successors is generally a completed gift of a future interest at funding, valued under § 7520, with no § 2503(b) annual exclusion (the interest is future, not present), unless the donor retains a permitted power to revoke or redirect it. Where skip persons can take, GST consequences arise as well. Model the transfer-tax cost separately from the deduction. Adding a second life, by contrast, lengthens the joint-and-survivor expectancy, shrinks the remainder, and makes the 10% test harder, an effect that compounds on the longer-of structure and bites hardest for younger lives.

The marital deduction and the non-spouse-taker defect

The special CRT marital deduction under §§ 2056(b)(8) and 2523(g) requires that the spouse be the only noncharitable beneficiary other than the donor; the spouse's interest may be a term interest rather than a life interest. The defeating feature is therefore not the guaranteed term itself but the presence of a non-spouse noncharitable taker. A longer-of structure whose term balance can pass to children or other non-spouse beneficiaries loses the clean §§ 2056(b)(8)/2523(g) answer, because the spouse is no longer the sole noncharitable beneficiary. The family-protection appeal of routing the term balance to children therefore carries a transfer-tax cost for married couples. A couple that wants the survivor fully covered for life uses a clean joint-and-survivor life structure; a couple that wants a guaranteed minimum number of years to children accepts the loss of the marital deduction, and should separately analyze whether any QTIP route is available.

Strategic Implications for Practice

Treat the payout period as a design choice, not a form default. Drafting systems present a default period, usually one or two lives, without asking whether a term, a shorter-of, or a longer-of structure would better match what the donor wants and what the actuarial math will bear. The default is right for the standard married couple seeking lifetime income. It is wrong often enough that the question should be asked at intake every time.

Match the period to the donor's actual goal before touching the math. Lifetime security points to a life structure. A finite funding window points to a term. A desire to protect heirs against an early death points to longer-of, or, where a fixed number of years is the whole point, to a straight 20-year term that already guarantees those payments within a clean sample form. Reach for longer-of only when the donor wants lifetime coverage beyond the floor as well as the floor itself.

For younger donors, let the actuarial test narrow the menu. A donor under roughly 55 who wants a high payout will struggle to qualify a life or longer-of structure, because the long expectancy depresses the remainder. The term and shorter-of structures are the ones that hold up, and a 20-year term often produces a materially better deduction for a young donor than a single life does. Steer accordingly.

For older donors, qualification is rarely the binding constraint. Past the mid-to-late 60s, all four options clear the 10% test at ordinary payouts, and the longer-of structure in particular has converged on the favorable term value. The selection becomes a pure goals question, and the donor can frequently support a higher payout than a younger donor could.

Run the test before drafting, and document it. The 10% calculation is a function of the payout rate, the § 7520 rate, and the period, and it must be satisfied with respect to each contribution -- including later additions, tested separately. A trust drafted without that check, and that fails on funding, is malpractice exposure. The CalCRUT Deduction Calculator runs the test for typical configurations, and the CRUT Payout Path tool models how the income stream and remainder evolve under each period. Both are a useful first pass at intake.

Coordinate the transfer-tax consequences with the estate plan. A longer-of structure that routes a term balance to non-spouse takers is not free. It makes a completed gift of a future interest at funding, can raise GST issues where skip persons benefit, and forfeits the special CRT marital deduction. Those consequences belong in the model alongside the income tax deduction, not as an afterthought.

Practice Notes

Intake questions for payout-period selection

• Does the donor want income for life, for a finite window, or for a guaranteed minimum number of years regardless of survival?

• Is protecting heirs against an early death a goal, and if so, is a clean 20-year term enough, or does the donor also want lifetime coverage beyond the floor?

• What is the donor's age, and the second life's age if there is one?

• What payout rate is the donor targeting, and is it driven by cash-flow need or by deduction maximization?

• Is the donor married, and does the plan need the §§ 2056(b)(8) or 2523(g) marital deduction that a non-spouse term taker would forfeit?

Drafting checklist

• Period drafted as a life or lives, a term not exceeding 20 years, or a longer-of or shorter-of hybrid under Treas. Reg. § 1.664-3(a)(5)

• Every measuring life, including any second or successor life, confirmed in being on the funding date under § 1.664-3(a)(3)

• Period confirmed not to extend beyond the greater of the lives or a 20-year term, so that the prohibited "life then term" construction is avoided

• 10% MRI calculation run and documented at the donor's age, target payout, and the applicable § 7520 rate (funding month or either of the two prior months by election) before signing, and re-run for each later contribution

• For a guaranteed-term feature whose balance can pass to non-spouse takers, the loss of the §§ 2056(b)(8)/2523(g) marital deduction confirmed and accepted in writing, and the completed-gift and any GST consequence of the successor interest modeled

• Takers of any term balance identified, with recognition that they need not be in being at inception

• For a CRAT, the 5% probability-of-exhaustion test addressed, by shortening with a shorter-of cap or by incorporating Rev. Proc. 2016-42 sample qualified-contingency language

Red flags during design

• A default life structure adopted for a young donor with a high target payout, where the 10% test will fail and a term or shorter-of structure would clear

• A longer-of structure rejected for an older donor on the mistaken belief that the 20-year floor adds actuarial drag

• A guaranteed-term balance routed to non-spouse takers without the marital-deduction, completed-gift, and GST conversation

• A "life then term" period that can outlast both the lives and the 20-year cap

• A second younger life added to a longer-of structure without rerunning the test

• Any period selected without articulating which donor goal -- lifetime income, a finite window, or heir protection -- it is meant to serve
  

This briefing is provided for educational purposes and reflects federal law as of June 2026. It does not constitute legal or tax advice. Payout-period selection for a charitable remainder unitrust interacts with the donor's age, target payout rate, the § 7520 rate at funding, and the donor's family and estate-planning goals, and the qualifying and advisable structure depends on specific facts not addressed in this general treatment. Consult qualified legal and tax counsel before adopting a payout structure.

Considering a CRUT and weighing how long the payments should run? The payout period drives the income the donor keeps, the actuarial qualification of the trust, and whether anything reaches the donor's family. For a consultation that treats period selection as an integrated design decision rather than a form default, schedule a free call.

About CalCRUT. CalCRUT is the charitable remainder trust practice of Klaus Gottlieb, Esq. -- JD, MS, MBA -- serving the California Central Coast and California statewide.