Step-Up in Basis at Death for Business Interests: Why Selling Before Death Can Be a Tax Disaster

One of the most powerful provisions in the U.S. tax code for business owners is the step-up in basis at death. When an owner dies, their heirs inherit the business interests with a tax basis equal to the fair market value at the date of death — rather than the owner's original basis. This can eliminate decades of accumulated capital gain from ever being taxed.

For business owners contemplating whether to sell during life or hold until death, this provision radically changes the calculus. A business sold during life with $10M of appreciation produces roughly $2M-$2.4M of federal capital gains tax (plus state). The same business held until death and then sold by heirs produces $0 capital gains tax on pre-death appreciation.

This article explains how the step-up works, why it's especially valuable for business owners, when selling before death still makes sense despite the tax cost, and the specific planning moves that preserve step-up benefits.

Under Section 1014 of the Internal Revenue Code, property acquired from a decedent takes a basis equal to its fair market value at the date of the decedent's death (or alternate valuation date six months later, if elected).

Example: Owner acquired business interests for $100,000 in 1995. Over 30 years, the business grew to $5,000,000 value at death.

• Owner's basis at death: $100,000
• Fair market value at death: $5,000,000
• Built-in gain at death: $4,900,000

If owner had sold before death: capital gain of $4,900,000, federal tax of approximately $980,000-$1,165,000 (depending on LTCG rates and NIIT), plus state tax.

If heirs receive at death: basis reset to $5,000,000. If heirs sell for $5,000,000 the next day, gain is $0.

The step-up eliminates decades of built-in appreciation from ever being subject to income tax.

Step-up in basis does not eliminate estate tax. Both taxes apply:

• At death, the business is included in the taxable estate and potentially subject to 40% estate tax on amounts above the federal exemption (approximately $13.6M per person for 2024).
• Heirs receive the business with stepped-up basis, eliminating income tax on pre-death appreciation.
• If heirs later sell, they pay income tax only on appreciation after date of death.

This means high-net-worth owners face a choice between two tax regimes:

• Sell before death: Pay income tax on built-in appreciation (up to 23.8% federal at current rates plus state). No estate tax on proceeds (potentially — depending on estate size and exemption).
• Hold until death: Potentially pay estate tax on full business value (40% on amounts above exemption). No income tax on pre-death appreciation.

Which is better depends on:

• Marginal income tax rate vs. estate tax rate
• Whether estate is above or below federal exemption
• State tax considerations
• Available estate planning tools to reduce estate tax
• Whether heirs will sell or continue holding

Step-up in basis provides the most value when:

Business has substantial appreciation. A business bought for $100K and grown to $10M has $9.9M of appreciation. Eliminating tax on that appreciation saves $1.98M-$2.36M in federal income tax alone.

Owner is in high income tax bracket. Higher marginal rates mean larger tax savings per dollar of eliminated gain.

Basis is low relative to current value. Businesses purchased at modest prices and grown substantially have the largest basis gap.

State income tax is meaningful. Federal long-term capital gains rates are 15-23.8%; many states add another 5-13%. Step-up eliminates both federal and state tax on pre-death appreciation.

Estate is below the federal estate tax exemption. If estate tax doesn't apply, step-up delivers pure benefit. An estate worth $10M (below the $13.6M exemption for 2024) has no estate tax but gets full step-up on business interests.

Heirs plan to sell. If heirs will eventually sell, the step-up provides maximum direct benefit. If heirs plan to hold indefinitely, step-up doesn't matter until eventual sale or their own death.

For many closely-held business owners with estates below the federal exemption, step-up is one of the most valuable planning tools available — and one that requires no complex structure, just holding until death.

Step-up benefit is real but has costs:

Continuing business risk. The business can lose value between today and the owner's death. Step-up preserves current value; it doesn't guarantee future value. A business held too long may be worth much less when the owner eventually dies.

Owner age and health. A young, healthy owner has decades before step-up benefit is realized. The time value of tax deferred decades into the future is reduced.

Liquidity needs. The owner may need liquidity during life — for retirement, healthcare, long-term care, or other purposes. Forcing asset retention to preserve step-up doesn't work if the owner actually needs the cash.

Business succession reality. If no successor exists and the business will be sold eventually, holding until death means the heirs face the sale. Sometimes it's simpler for the owner to sell during life.

Planning flexibility. During life, owners can use estate planning tools (GRATs, IDGTs, family partnerships) to transfer business interests efficiently. After death, options are more limited.

Estate tax exposure. For owners with estates well above the federal exemption, estate tax (40% on amounts above exemption) can exceed the income tax they'd pay on a pre-death sale. In this case, lifetime gifting and sales may be more tax-efficient than holding for step-up.

The decision isn't automatic. Each situation requires analysis of the specific factors.

For business owners with significant business appreciation, estate planning has a genuine tension between two goals:

Reducing estate tax. Accomplished by moving assets out of the estate during life — through gifts, sales to trusts, GRATs, IDGTs, and other vehicles.

Preserving step-up basis. Accomplished by keeping assets in the estate until death.

You can't fully achieve both. Assets transferred out of the estate for estate tax efficiency lose step-up benefit. Assets retained for step-up remain subject to estate tax.

The balance typically involves:

• Using available lifetime exemption ($13.6M for 2024; $27.2M for married couples) for transfers of appreciating assets, accepting loss of step-up on those specific assets
• Retaining other assets (potentially the most-appreciated ones) in the estate for step-up benefit
• Using structures like GRATs that can transfer future appreciation out of estate without using full exemption on current value
• Planning for use of exemption vs. step-up based on expected appreciation patterns

For estates near the exemption level, the optimal balance tips toward retaining assets for step-up. For estates far above exemption, aggressive lifetime transfers to avoid estate tax tend to dominate.

A specific benefit for married couples: assets can receive basis step-up at both spouses' deaths.

First spouse's death: Assets transferred to surviving spouse receive step-up in basis at the first spouse's death (assuming they were owned by the first spouse or jointly owned).

Second spouse's death: Any assets still held by the surviving spouse receive another step-up at the second spouse's death.

For community property states, both halves of community property receive step-up at the first spouse's death — a specific advantage community property provides.

For common-law states, only the deceased spouse's portion of jointly owned property receives step-up at first death. The surviving spouse's original half retains its original basis until the surviving spouse's death.

Planning implication: Married couples in common-law states may want to consider how property is titled. Tenancy by the entirety or other joint ownership may be convenient during life but sacrifices some step-up at first death. Separate property or community property equivalents (where available) may produce better basis outcomes.

For community property states (Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, Wisconsin, plus Alaska as opt-in), this issue resolves itself. Business interests owned as community property receive full step-up at the first spouse's death.

Compare transfer mechanisms from the recipient's perspective:

Gift during life: Recipient receives donor's basis. Built-in gain transfers with the asset. If recipient sells, they pay tax on built-in gain plus any post-gift appreciation.

Inheritance at death: Recipient receives stepped-up basis. Built-in gain is eliminated. If recipient sells, they pay tax only on post-death appreciation.

For most assets, inheritance at death is significantly more tax-favored than gift during life for the recipient. This is why wealthy families often prefer to transfer assets at death rather than during life, despite the estate tax cost.

But: gifts during life can provide other benefits — moving future appreciation out of the donor's estate, providing resources to family members during life, implementing specific family transition plans. The trade-off is situation-specific.

A specific planning structure that captures some benefits of both gifts and step-up:

Sale to Intentionally Defective Grantor Trust (IDGT). Owner sells business interest to an IDGT for its current value, taking back an installment note. The IDGT is structured so:

• Business interest is outside the owner's estate (no estate tax)
• Owner pays income tax on trust income (grantor trust) — further reducing estate
• Owner receives installment note payments

The basis result: The installment note in the owner's estate receives step-up basis at death. But the business interest now in the trust doesn't get step-up (it's not in the estate).

This structure moves appreciation out of the estate while capturing basis benefits on the note. It's complex and specific, but for substantial planning, it can combine both benefits effectively.

Variations exist (GRATs, GRITs, and other vehicles) with different specific characteristics.

State-level implications affect the step-up analysis:

State income tax on capital gains. Most states tax capital gains at ordinary income rates. A state with a 10% top rate adds substantially to the tax cost of pre-death sale.

State estate or inheritance taxes. Some states have their own estate or inheritance taxes with lower exemptions than federal. These can affect the optimal strategy.

State-specific basis rules. State income tax follows federal basis rules in most cases, but edge cases exist.

For owners in high-tax states, step-up benefit is proportionally larger because it eliminates state tax as well as federal tax on pre-death appreciation.

One important exception to step-up: Income in Respect of a Decedent (IRD) does not receive step-up basis.

IRD includes amounts the decedent had earned but not yet received or recognized for tax purposes at death:

• Installment payments from completed sales
• Deferred compensation
• Unpaid wages
• Traditional IRA and 401(k) balances (the income tax on which is deferred until distribution)
• Receivables from business sales completed but not yet fully paid

IRD retains the decedent's tax basis and is subject to income tax when received by the heirs. This is why traditional retirement accounts don't provide the same basis benefit as taxable investment accounts — the heirs receive ordinary-income treatment on distributions rather than capital gain with stepped-up basis.

For business owners, the IRD issue most commonly arises with installment sales. If the owner sold the business before death with an installment note, the note payments received by heirs remain ordinary income subject to the original gain calculation. Selling before death and dying with the installment note doesn't produce the step-up benefit that holding and dying with the business would have.

Current step-up rules have been stable for decades, but proposals to modify or eliminate the step-up have been recurring political topics.

Potential changes that have been proposed:

• Carryover basis: Heirs would receive the decedent's original basis (like gifts). This would eliminate the step-up benefit.
• Constructive realization at death: Built-in gains would be recognized at death as if the assets were sold. Estate would pay income tax on built-in gain.
• Partial step-up: Step-up up to a cap, with gains above the cap carried over.
• Step-up only for assets held for long periods: Time-based limitations.

None of these have been enacted. Step-up in basis remains in effect. But owners planning around step-up should be aware that the rules could change. Major estate plans relying heavily on step-up benefits should have contingency plans if step-up is modified or eliminated in future legislation.

Despite the step-up benefit, selling before death is the right move in several situations:

Owner needs the liquidity. Retirement funding, healthcare costs, long-term care, family support. If the liquidity is actually needed, forcing retention for step-up doesn't work.

No viable succession path. If there's no successor (family or otherwise) capable of running the business, selling to third party while owner is healthy and can negotiate produces better outcomes than a distressed post-death sale.

Business is past its peak. If the business has peaked and is likely to decline, the step-up benefit is capturing a high-water mark that may not hold until death. Selling at peak produces better total outcome.

Owner wants to see the legacy placed well. Selling during life lets the owner negotiate who acquires the business, on what terms, with what provisions for employees and customers. Post-death sales by heirs often optimize for price rather than legacy.

Estate tax benefit from removal exceeds income tax cost. For estates far above exemption, aggressive lifetime transfers may produce better total tax outcome than holding for step-up.

Owner is young or mid-career. Time horizon to death is long; step-up benefit decades in the future has reduced present value.

The decision requires case-specific analysis of each factor.

For owners contemplating business sale vs. retention, the analysis:

1. Estimate business value and built-in gain. What appreciation has occurred?
2. Estimate expected future appreciation. What growth is likely before anticipated death?
3. Estimate owner's remaining life expectancy. Actuarial tables plus personal health considerations.
4. Estimate combined federal and state income tax on sale. At current rates.
5. Estimate estate tax exposure at projected death. Consider exemption levels (with potential 2026 reduction).
6. Estimate liquidity needs during remaining lifetime. How much cash is needed for living expenses, healthcare, long-term care?
7. Consider successor availability and family succession preferences.
8. Model combined outcomes: Sell now vs. hold until death, including estate tax, income tax, time value of money, and liquidity considerations.

For many owners, this analysis produces clear direction. For others, it reveals a close call where specific factors (owner's comfort with continued business management, family dynamics, health trajectory) tip the decision.

The analysis should be revisited periodically as circumstances change. An owner at 60 with a healthy business and estate below exemption might optimize for hold-until-death. The same owner at 75 with a weakened business and unexpected liquidity needs might optimize for pre-death sale. The right answer at different life stages may differ.

For owners with significant business appreciation and estates at or below the federal exemption, the default assumption should be to hold the business until death unless specific reasons argue for pre-death sale.

The income tax savings from step-up in basis typically exceed other considerations. Forcing a sale to achieve other objectives — diversification, simplicity, liquidity — should require specific justification rather than being the default.

For owners above the federal exemption, the analysis is more complex and typically involves combinations of lifetime transfers (to reduce estate tax) and retained interests (to capture step-up). Qualified estate planning counsel should drive these analyses.

Either way, understanding step-up in basis and its implications is essential to making good decisions. Many owners make major sale decisions without understanding this provision, and the tax cost can be enormous.