For founders who have spent years building a business, the moment a buyer arrives — whether a strategic acquirer, a private equity firm, or a special purpose acquisition company — should be the culmination of careful planning, not the beginning of a frantic scramble. Yet for many business owners, the exit event arrives before their estate plan is prepared to handle it. The result can be a transfer of wealth to the federal government that dwarfs what any investor or acquirer would have taken. Understanding how M&A transactions and SPAC mergers interact with estate planning tools — and why timing is everything — is essential for any founder who hopes to protect and transfer the wealth created by an exit.
Why Exit Events Create Urgent Estate Planning Needs
An exit event is, by definition, a liquidity event. The illiquid equity that a founder held in a private company — equity that may have been difficult to value and difficult to sell — suddenly becomes cash, marketable securities, or some combination of both. This transformation has profound tax consequences. At the federal level, a founder selling equity in a company may face long-term capital gains tax at rates up to 23.8 percent (including the net investment income tax), plus applicable state income taxes. If the exit occurs near the end of the founder’s life, or if the founder retains the proceeds until death, the estate may face federal estate tax at 40 percent on the net taxable estate above the applicable exemption amount. The combination of income tax on exit proceeds and estate tax on the resulting wealth accumulation is often described as the “double tax” problem of business succession.
What makes exit events particularly dangerous from a planning perspective is their compressed timeline. In ordinary circumstances, an estate planning attorney works with a client over months or years to establish trusts, fund them with discounted business interests, structure gifts and installment sales, and implement strategies that operate over extended time horizons. An exit event disrupts this leisurely cadence. Once a letter of intent is signed, the deal machinery accelerates, and the window for implementing many of the most powerful estate planning strategies closes — sometimes permanently. Founders who have not planned in advance of a deal announcement find themselves with far fewer options and far higher tax exposure.
The Compressed Timeline Problem
Unlike a traditional initial public offering, which typically involves a months-long process of SEC registration, roadshows, and bookbuilding during which founders and their advisors have time to implement estate planning strategies, M&A transactions and SPAC mergers can move with remarkable speed once the parties reach agreement in principle. A letter of intent signed on a Monday can lead to a definitive merger agreement three weeks later, and closing may follow within 60 to 90 days. Each milestone in this timeline forecloses certain planning strategies that were available the day before.
The most valuable planning window is before any deal is announced, before any serious negotiations begin, and ideally before the company has even attracted significant buyer interest. During this pre-deal period, the founder can transfer business interests at their lowest defensible valuation — capturing the maximum discount for lack of marketability, lack of control, and the inherent uncertainty of a private company’s value. Once a deal is in process, valuations increase to reflect the known (or suspected) transaction price, and the estate planning techniques that depend on low valuations become less effective. Founders who establish GRATs, IDGTs, and family limited partnership structures years before an exit will find that those structures have already done the heavy lifting of removing appreciation from their taxable estates by the time the exit arrives.
Planning Before Signing: The Anticipatory Assignment of Income and Step Transaction Doctrines
The single most important principle in exit event planning is this: transfers must be completed before the owner makes a binding commitment to sell. The Internal Revenue Service applies two related doctrines — the anticipatory assignment of income doctrine and the step transaction doctrine — that can recharacterize or wholly disallow transfers made too close to, or after, a binding commitment to sell has been made.
The anticipatory assignment of income doctrine, rooted in the Supreme Court’s decision in Lucas v. Earl, holds that income is taxed to the person who earns it, and that an assignment of the right to receive future income does not shift the tax liability to the assignee if the income has already been earned or the right to receive it is sufficiently fixed. In the context of a business sale, if a founder transfers stock to a trust after the sale price has been negotiated and a binding agreement has been reached, the IRS may argue that the income — the gain on the sale — had already been earned (or was already committed to be paid to the founder), so the transfer to the trust is disregarded for income tax purposes and the gain is still taxable to the founder.
The step transaction doctrine is related but distinct. It allows the IRS to collapse a series of formally separate transactions into a single integrated transaction if the steps were prearranged and interdependent. A founder who transfers stock to a family member and then, days later, that family member receives sale proceeds may find that the IRS treats the transfer and the sale as a single transaction — the founder sold the stock and the transfer is disregarded. The critical question in both doctrines is when a commitment to sell becomes sufficiently binding to trigger recharacterization.
Courts have applied a facts-and-circumstances test to determine the point of commitment. Signed letters of intent, executed term sheets, and board resolutions approving a sale are strong indicators that a binding commitment exists, even if a formal merger agreement has not been signed. Non-binding letters of intent present a closer question, but prudent practitioners treat even non-binding expressions of interest as a signal that the planning window is closing. The safest rule of thumb is that all major estate planning transfers should be completed before any deal documents are signed and before the founder has engaged in substantive negotiations about price and terms.
SPAC Mechanics and Their Estate Planning Implications
A special purpose acquisition company, or SPAC, is a publicly traded shell company formed for the sole purpose of acquiring a private operating company. In a SPAC merger (technically called a “de-SPAC transaction”), the private target company merges with the SPAC, and the target’s shareholders receive shares in the now-publicly-traded combined entity. From the perspective of the target’s founders and investors, this is an exit — they have exchanged their private company stock for publicly traded shares, and those shares can ultimately be sold in the public market.
The de-SPAC transaction can be structured as a tax-free reorganization under Section 368 of the Internal Revenue Code, meaning that the exchange of private company stock for SPAC shares is not a taxable event at the time of the merger. The founder’s basis in the SPAC shares carries over from the basis in the private company stock. The gain is deferred until the founder sells the publicly traded shares. This deferral feature creates a significant estate planning opportunity: the founder holds a large block of publicly traded shares with a very low basis, and the strategies appropriate for concentrated positions (discussed in the companion article on concentrated position planning) become applicable.
Estate planning around a SPAC transaction must account for several SPAC-specific mechanics. First, SPAC deals carry deal risk — the SPAC must obtain shareholder approval, and SPAC shareholders have redemption rights that can reduce the available cash and potentially cause the deal to fall through. Any estate planning implemented before a SPAC deal closes must take into account the possibility that the deal does not close and the founder is left holding private company stock. Second, after a SPAC merger closes, the founder’s shares are typically subject to a lockup period — often six months to one year — during which the shares cannot be sold or transferred. Third, the founder may also receive warrants or other consideration as part of the SPAC deal structure, each of which has distinct tax and estate planning characteristics.
From a timing perspective, the anticipatory assignment of income and step transaction concerns apply to SPAC transactions just as they do to traditional M&A. A founder who transfers SPAC shares (or the underlying private company interests) to a GRAT or IDGT before the merger closes — and while the merger’s completion is not yet a foregone conclusion — is in a stronger position than one who transfers after the merger agreement is signed and the outcome is essentially certain. The pre-closing period, particularly before a binding SPAC merger agreement is executed, is the optimal window for implementing or completing estate planning strategies.
Stock-for-Stock Mergers and Section 368 Reorganizations
In a stock-for-stock merger structured as a tax-free reorganization under Section 368, the target company’s shareholders exchange their shares for shares in the acquiring company (or the surviving entity in a SPAC merger) without recognizing gain at the time of the exchange. This non-recognition treatment is powerful — it allows founders to defer potentially enormous capital gains until they choose to sell the acquiring company’s stock.
The interaction between a Section 368 reorganization and previously established estate planning structures — GRATs, IDGTs, family limited partnerships — requires careful attention. If a GRAT holds target company stock at the time of a merger, the GRAT will receive acquirer shares in exchange. The GRAT’s terms generally continue to govern the trust, and the annuity payments due to the grantor will now be satisfied with acquirer shares (or cash, depending on the GRAT’s terms). If the substituted shares are worth significantly more than the original GRAT contribution by the time of the exchange, the GRAT will likely be in a strong position to pass wealth to the remainder beneficiaries. Similarly, an IDGT that holds target company stock will receive acquirer shares in a tax-free reorganization, and those shares become trust assets subject to the same grantor trust mechanics.
One nuance worth understanding is that the tax-free treatment in a Section 368 reorganization can be jeopardized if the transaction involves too much cash consideration (“boot”). When a merger involves both stock and cash consideration — which is common in many M&A transactions and virtually all SPAC transactions — the cash portion may be taxable even if the stock portion is not. A founder receiving mixed consideration needs to carefully allocate basis between the taxable and non-taxable components of the deal consideration.
Gift and Sale Strategies for Earnout Rights and Contingent Consideration
Many M&A transactions include earnout provisions — contractual rights that entitle the seller to receive additional consideration if the acquired company meets specified performance milestones after closing. Earnouts are most common in transactions where the buyer and seller disagree about the target company’s future earnings power: the earnout bridges the valuation gap by making part of the purchase price contingent on future performance.
From an estate planning perspective, earnout rights are property with a present value, even though the ultimate amount — if anything — to be received depends on future events. The present value of an earnout right depends on the probability that the milestones will be met, the time value of money, and the expected amount of the earnout payments. A qualified appraiser can provide a present value opinion for an earnout right using discounted cash flow and probability-weighted analysis.
Gifting or selling earnout rights to an intentionally defective grantor trust or an adult child before the earnout amount is determined can be a powerful wealth transfer strategy. If the earnout right is transferred when its present value is low — for instance, shortly after closing, when the milestones are still uncertain — and the milestones are subsequently met, the full earnout payment flows to the trust or transferee without gift or estate tax on the appreciation. The gift tax cost is based on the present value at the time of transfer, not the amount ultimately received. The same principle applies to contingent consideration rights in SPAC transactions, such as earnout warrants or contingent value rights.
The caveat is that the IRS scrutinizes transfers of contingent rights closely. The step transaction doctrine may apply if the transfer occurs immediately before the earnout amount is determined or if the outcome was essentially certain at the time of the transfer. Additionally, if the earnout right is structured as an installment obligation, special rules under Section 453 may affect the income tax treatment of both the transfer and the subsequent payments.
Rollover Equity Planning
In many private equity acquisitions, founders do not receive 100 percent of the purchase price in cash at closing. Instead, they “roll over” a portion of their equity — typically 20 to 40 percent of their proceeds — into the acquiring entity, receiving an equity interest in the buyer’s holding company or operating partnership in exchange for a portion of their company stock. This rollover equity is designed to align the founder’s interests with those of the private equity sponsor for the next phase of the company’s growth, and it often represents the most valuable component of the ultimate return if the company is later sold again at a higher multiple.
The receipt of rollover equity is generally structured to be tax-free under Section 721 (if the buyer is a partnership) or Section 351 (if the buyer is a corporation), allowing the founder to defer gain on the rolled equity while immediately recognizing gain on the cash component of the deal. The rollover equity typically has a new vesting schedule — requiring the founder to continue working for the business for three to five years to earn the full value — and is subject to the terms of a new shareholders’ or partnership agreement.
From an estate planning perspective, rollover equity presents both an opportunity and a challenge. The opportunity is that rollover equity, at the moment it is received, may be valued at a relatively modest amount — reflecting the post-leverage, post-transaction capital structure of the acquired company — even though it has the potential to be worth multiples of its initial value if the company performs well. This low initial value makes rollover equity an excellent candidate for transfer to an IDGT or family limited partnership shortly after the initial transaction closes, before the company has had time to demonstrate performance and before the rollover equity has significantly appreciated.
The challenge is that rollover equity is typically subject to significant transfer restrictions. The new shareholders’ agreement or partnership agreement will almost certainly restrict the founder’s ability to transfer the equity without the consent of the sponsor, and may include rights of first refusal, drag-along rights, and other provisions that limit the founder’s unilateral disposition of the interest. Any estate planning transfer must be made consistent with the terms of the governing agreement, and the attorney drafting or reviewing those agreements should flag transfer restrictions that would impede estate planning.
Deal-Specific Lockup and Transfer Restrictions
Nearly every M&A and SPAC transaction includes restrictions on the sale or transfer of the consideration received by target company shareholders for a period after closing. In a SPAC merger, the founder lockup period is typically six months to one year, during which the founder cannot sell, transfer, or hedge the publicly traded shares received in the merger. In a traditional M&A transaction where the consideration includes shares of the acquirer, similar lockup provisions or registration requirements may apply.
These lockup and transfer restrictions have direct implications for estate planning. If the shares cannot be transferred without the acquirer’s or underwriter’s consent, the founder cannot fund a trust with those shares during the lockup period, cannot contribute them to an exchange fund, and cannot implement most direct transfer strategies. The founder is, in effect, frozen — holding a highly appreciated, concentrated position that cannot be moved for a defined period.
This is precisely why pre-closing estate planning is so important. Transfers of private company stock to trusts and other vehicles before the deal closes — before the private stock becomes locked-up publicly traded stock — can sidestep the lockup problem entirely. Once the trust holds the shares (which it received in exchange for the private stock in the tax-free reorganization), the trust is subject to the same lockup as the founder, but the estate planning transfer has already been made. The appreciation that occurs after closing — after the lockup expires and the stock is free to trade — accrues inside the trust rather than in the founder’s taxable estate.
Practical Guidance for Founders
The single most important action a founder can take is to engage an estate planning attorney long before any deal process begins. The ideal time to establish trusts, implement GRATs, and transfer business interests is when the company is still early-stage, the valuation is low, and the founder’s intentions are driven by long-term planning rather than imminent tax avoidance. Transfers made years before an exit are insulated from step transaction and anticipatory assignment of income challenges, and they benefit from the lower valuations that characterize earlier-stage companies.
If a founder has not yet implemented an estate plan and a deal process is beginning, the immediate priority is to assess the current state of planning and identify any transfers that can still be completed before a binding commitment is made. If a letter of intent has not yet been signed and negotiations have not yet reached the point of a definitive agreement on price and structure, there may still be time to complete meaningful transfers. The estate planning attorney, working in close coordination with the M&A attorney and the founder’s financial advisors, must act quickly to implement whatever strategies remain available.
After the deal closes, the focus shifts to managing the consideration received — whether cash, publicly traded shares, rollover equity, or earnout rights — in a tax-efficient manner consistent with the founder’s estate planning goals. Each component of deal consideration has its own planning opportunities and constraints, and the post-closing period requires a coordinated effort among the estate planning attorney, the tax advisor, and the investment advisor to maximize the long-term benefit of the liquidity event. Founders who approach the exit process with a well-designed estate plan already in place will find that the exit is not a planning emergency but the successful culmination of years of thoughtful preparation.