By Andrew Bellm
Cost basis planning is one of the more economically meaningful, but often underappreciated, dimensions of estate planning. While traditional planning frequently centers on estate tax reduction, probate avoidance, or creditor protection, the income tax impact of inherited assets, driven largely by cost basis rules, can have an equal or greater effect on the after-tax wealth ultimately received by beneficiaries.
Why Cost Basis Matters in Estate Planning
Cost basis determines the amount of gain or loss recognized when an asset is sold. In the estate context, most appreciated assets included in a decedent’s taxable estate receive a “step-up” (or “step-down”) in basis to fair market value at death under Internal Revenue Code §1014. This mechanism can permanently eliminate capital gains on appreciation that occurred during the decedent’s lifetime.
The planning significance is straightforward: two assets with identical pre-tax value may produce very different after-tax outcomes depending on whether they receive a step-up in basis. As a result, estate planning is increasingly about managing not only dispositive intent, but also income tax efficiency at the generational transfer point.
Planning Techniques That Affect Basis Outcomes
A central theme in cost basis planning is deciding which assets should be included in a taxable estate at death and which should be transferred during life.
Appreciated assets held individually are often favorable candidates for retention until death because they generally receive a full basis step-up. By contrast, lifetime gifts typically transfer carryover basis under Internal Revenue Code §1015, preserving embedded gain for the donee.
Grantor trusts provide more flexibility. In particular, “swap powers” (substitution powers) allow the settlor to exchange high-basis assets out of an irrevocable trust in exchange for low-basis assets being pulled back into the estate. Properly structured, this technique can intentionally concentrate low-basis assets in the taxable estate at death to secure a step-up in basis, while moving higher-basis assets outside the estate during life.
Charitable planning also plays an important role. Contributions of appreciated property to qualified charities generally eliminate capital gains while providing an income tax deduction at fair market value, subject to AGI limitations. This allows clients to intentionally “erase” embedded gain where philanthropy is already part of the planning objective.
Powers of Appointment as a Basis Planning Tool
Powers of appointment add a more nuanced but powerful layer to basis planning because they can influence whether assets are included in a beneficiary’s taxable estate, and therefore whether a step-up in basis is available at a later generation.
A general power of appointment (GPOA), exercisable in favor of the holder, their estate, their creditors, or creditors of their estate, typically causes the assets subject to that power to be included in the holder’s gross estate under Internal Revenue Code §§2041 and 1014. This inclusion generally triggers a basis adjustment at the holder’s death.
This creates a planning opportunity. By granting a beneficiary a limited or general power of appointment over trust assets, a drafter can potentially “toggle” estate inclusion, depending on whether a step-up in basis is desirable at that generational level. In some cases, intentionally granting a general power, or allowing the lapse or exercise of such a power, can secure a future basis step-up, even where the assets originated in an irrevocable trust.
However, this technique is highly sensitive to design. A general power of appointment can also expose assets to the holder’s creditors and may accelerate estate tax inclusion in unintended ways. Conversely, a limited power of appointment, while more protective, does not generally cause estate inclusion and therefore may forgo basis adjustment opportunities.
Accordingly, powers of appointment are often used as a flexible drafting tool to balance control, creditor protection, and income tax efficiency, rather than as a default inclusion mechanism.
Trade-Offs in Cost Basis Planning
The core tension in cost basis planning remains the trade-off between estate tax minimization and income tax minimization. Historically, estate tax reduction dominated planning decisions. Today, with a relatively high federal exemption, income tax and cost basis planning considerations frequently drive the optimal outcome.
Retaining assets until death generally maximizes basis step-up opportunities but may increase estate tax exposure if exemption amounts decrease or if the estate exceeds exemption thresholds. Lifetime gifting reduces estate size but often sacrifices basis step-up, leaving heirs with embedded gain.
Powers of appointment and grantor trust techniques can partially bridge this divide by selectively controlling estate inclusion. However, they introduce complexity, drafting sensitivity, and potential creditor and tax inclusion risks.
Tennessee Community Property Trusts and Basis Planning
Tennessee’s community property trust statute provides another significant basis planning tool. Although Tennessee is not a traditional community property state, spouses may elect community property treatment through a properly drafted trust.
The primary tax advantage is that, upon the first spouse’s death, both halves of community property generally receive a full step-up in basis under Internal Revenue Code §1014(b)(6). This “double step-up” can significantly reduce or eliminate capital gains on appreciated assets such as securities or real estate.
However, this benefit comes with structural trade-offs. Community property classification affects ownership characterization, creditor rights, and divorce treatment, and requires careful coordination with existing estate planning structures.
Conclusion
Cost basis planning has become a central component of modern estate planning, particularly as income tax consequences increasingly rival estate tax considerations. Techniques such as grantor trust substitution powers, strategic use of powers of appointment, and Tennessee community property trusts allow planners to influence whether, and how fully, assets receive a step-up in basis at death.
Each approach, however, involves trade-offs between tax efficiency, control, creditor protection, and administrative complexity. The most effective planning therefore integrates basis planning as a core objective rather than a secondary consequence, while carefully balancing the legal and practical risks embedded in each structural choice.