Pecuniary bequests and fractional bequests are the two fundamental approaches to dividing an estate between the marital trust and the credit shelter trust. Every funding formula clause falls into one of these categories. The choice affects income tax consequences, gain or loss recognition on funding, administrative complexity, and the personal representative’s flexibility in allocating assets.
Neither approach is universally superior. Each has trade-offs that matter more or less depending on the composition of the estate, the expected time between the two spouses’ deaths, and the family’s priorities.
How a Pecuniary Bequest Works
A pecuniary bequest directs the personal representative to satisfy one trust’s share with a specific dollar amount, calculated by the formula at the date of death. A typical formula reads: “I give to the marital trust the smallest amount that, if allowed as a federal estate tax marital deduction, would result in the least possible federal estate tax.”
The personal representative then satisfies this dollar amount by distributing assets to the trust: cash, securities, real estate, or any combination. Because the dollar amount is fixed at death but asset values change before distribution, the drafter must specify a valuation method for in-kind distributions.
The pecuniary approach “freezes” the dollar amount of the pecuniary share at the date of death. All subsequent appreciation or depreciation accrues to the residuary share. If the estate appreciates between death and distribution, the residuary trust benefits. If the estate depreciates, the residuary trust bears the loss.
How a Fractional Bequest Works
A fractional bequest gives each trust a fraction of every asset. The formula calculates the fraction at death (for example, the marital trust receives a fraction equal to the optimum marital deduction divided by total estate value).
Under a pro rata fractional approach, every asset is split between the two trusts according to the fraction. If the marital fraction is 60%, the marital trust receives 60% of every stock, every bond, every parcel of real estate, and every other asset.
The fractional approach does not freeze either share. Both trusts participate proportionally in all appreciation, depreciation, and income between death and distribution. Neither trust is advantaged or disadvantaged by market movements during administration.
Tax Consequences: The Critical Difference
The most significant practical difference between the two approaches is the income tax treatment of funding.
- Pecuniary bequests can trigger gain or loss. When the personal representative distributes appreciated assets to satisfy a pecuniary bequest, the estate recognizes gain under the Kenan v. Commissioner rule, as if it had sold the assets and paid cash. If the estate holds assets that have appreciated since the decedent’s death (above their IRC § 1014 stepped-up basis), funding the bequest creates a taxable event. The gain is taxed to the estate and reduces assets available for the beneficiaries. This gain recognition applies only when assets have changed in value between the date of death (when they received a stepped-up basis) and the date of distribution. If assets are distributed immediately after death, the gain is minimal. If administration takes years and the market rises, the gain can be substantial.
- Fractional bequests do not trigger gain or loss. Because each trust receives a proportionate share of every asset, there is no deemed sale. No gain or loss is recognized on funding. This is a significant advantage when the estate holds volatile or illiquid assets that may appreciate substantially during administration.
This tax difference is the single most important factor driving the choice between the two approaches for most estates.
Administrative Trade-Offs
Beyond tax consequences, the two approaches differ in how much work they create during estate administration:
- Pecuniary bequests offer more flexibility. The personal representative can choose which assets to allocate to each trust (subject to any valuation method or “fairly representative” constraints). This “pick and choose” capability is valuable when different assets serve different planning purposes, for example, allocating income-producing assets to the marital trust and growth assets to the credit shelter trust.
- Fractional bequests are less flexible but simpler conceptually. Each trust receives the same proportionate share of every asset, with no gain recognition and no revaluation requirement (under the pro rata approach). The trade-off is limited ability to allocate specific assets strategically.
- Fractional bequests create ongoing co-ownership. Until the trust shares are separated (which may require a partition), both trusts technically own a fractional interest in every asset. This can complicate management, sale, and distribution of individual assets.
The administrative choice often comes down to whether the family values the personal representative’s flexibility in asset allocation more than the simplicity and tax neutrality of a proportionate split.
The Eight Mechanisms at a Glance
The pecuniary/fractional decision combines with the direction of the formula and the valuation method to produce eight distinct funding mechanisms. Each makes a different set of trade-offs:
Mechanisms 1–3 are pecuniary bequests where the marital trust receives the formula amount: true worth pecuniary (maximum flexibility, gain recognition risk), fairly representative pecuniary (no gain recognition, ratable sharing required), and minimum worth pecuniary (hybrid approach, overfunding risk).
Mechanisms 4–5 are reverse pecuniary bequests where the credit shelter trust receives the formula amount: true worth reverse pecuniary and fairly representative reverse pecuniary. The reverse direction applies the pecuniary’s funding complications to the smaller share.
To understand why this reduces complexity, see our guide to the reverse pecuniary approach.
Mechanism 6 is the pro rata fractional (every asset split proportionally, no flexibility). Mechanism 7 is the pick-and-choose fractional (the personal representative allocates assets, but the fraction is applied to asset values at distribution). Mechanism 8 is the single fund marital, which avoids actual division entirely by using a rolling fraction.
For an explanation of that simplest option, see our guide to the single fund marital approach and how it works.
Choosing Between Pecuniary and Fractional
The choice depends on the family’s priorities:
- Maximum flexibility in asset allocation. When this is the priority, a pecuniary approach (particularly the true worth or reverse true worth) gives the personal representative the most control over which assets go to which trust. This is especially valuable for estates containing a family business, control blocks of stock, or illiquid real estate.
- Avoiding income tax on funding. When this is the priority, a fractional approach eliminates gain recognition entirely. This is valuable when the estate holds assets likely to appreciate significantly during administration, or when administration is expected to take a long time.
- Simplicity. When this is the priority, the single fund marital eliminates the funding decision altogether, though it sacrifices all flexibility and makes GST exemption allocation less straightforward.
- Mixed priorities. When the estate contains mixed priorities, a fairly representative reverse pecuniary is often best: it avoids gain recognition (because assets are valued at estate tax value), applies the pecuniary mechanics to the smaller credit shelter share, and gives the marital trust the residue. Many practitioners consider this the default choice when no specific estate composition factor suggests another approach.
The right mechanism depends on the specific estate’s asset composition, the family’s planning goals, and how much administrative complexity the personal representative can manage.