M&A Exit: Cash vs Stock vs Rollover — Tax Treatment by Path

An acquisition typically pays selling shareholders in a combination of cash, acquirer stock, and sometimes rollover equity or deferred consideration. The specific mix is negotiated between buyer and seller based on deal structure (cash deal, stock deal, tax-free reorganization under §368, or hybrid). For employees with equity in the acquired company, the form of consideration received determines tax timing, character, and planning options.

This article walks through each path’s tax treatment, the planning moves that work before and at closing, and the common traps that cost selling shareholders meaningful money.

Cash Consideration: Immediate Capital Gain or Loss

Cash received at closing for stock sold in a taxable transaction triggers capital gain or loss under IRC §1001. The gain is long-term if the stock was held more than one year, short-term otherwise. Long-term federal rate for high earners is 20% plus 3.8% Net Investment Income Tax, for 23.8%. State rates stack on top, with California topping at 13.3%.

Cash deals are the simplest from a tax perspective. The calculation is clean: sale price minus basis equals gain. Basis depends on how the stock was acquired:

Founder stock or pre-IPO purchase: basis equals original purchase price (possibly plus §83(b) election amount if filed).
ISO exercise held for qualifying disposition: basis equals strike price. No ordinary income recognized.
NSO exercise: basis equals strike price plus ordinary income recognized at exercise (FMV minus strike).
RSU shares: basis equals vest-date FMV.

For QSBS-eligible stock held five years, §1202 excludes up to the greater of $10M or 10x basis from federal tax. State treatment varies; California does not follow §1202 and taxes the gain in full.

A founder with $50M of QSBS-eligible basis held six years, selling in a cash deal:

Gross proceeds: $50M
Basis: $500K
Gain: $49.5M
§1202 exclusion: greater of $10M or 10x $500K = $10M
Taxable federal gain: $39.5M
Federal tax at 23.8%: $9.4M
California tax at 13.3%: $6.58M on full $49.5M gain
Total tax: $15.98M
Net proceeds: $34.02M

Planning moves: §1202 stacking through pre-sale gifts to non-grantor trusts (each trust a separate §1202 exclusion). §1045 rollover if rolling into new QSBS within 60 days. State-residency changes if executed before closing.

Acquirer Stock: Tax-Free Reorganization or Taxable Exchange

An acquisition structured as a tax-free reorganization under §368 can defer gain recognition on the stock portion of consideration. Common reorganization types:

§368(a)(1)(A) statutory merger: target merges into acquirer. Stockholders receive acquirer stock.
§368(a)(1)(B) stock-for-stock: acquirer exchanges its stock for target stock. Must be “solely for voting stock.”
§368(a)(1)(C) stock-for-assets: acquirer acquires substantially all target assets for its voting stock.
Triangular mergers: variations involving a subsidiary of the acquirer.

If the transaction qualifies as a tax-free reorganization, the seller’s basis in the acquired stock carries over to the acquirer stock. No gain recognized at closing (except on any cash or “boot” portion).

If the transaction is taxable (typical in cash-plus-stock deals not structured as §368 reorganizations), the stock received is valued at closing-date FMV and triggers gain recognition equal to FMV minus basis.

A deal structured 60% cash / 40% acquirer stock, fully taxable:

Cash portion: $30M, gain recognized $30M minus cash-portion basis.
Stock portion: $20M of acquirer stock valued at closing-date FMV, gain recognized $20M minus stock-portion basis.
Total gain recognized at closing.
Basis in acquirer stock equals closing-date FMV ($20M).

The stock portion subsequently held is a concentrated position in the acquirer with a basis equal to the closing-date FMV. Gain or loss on subsequent sale runs from that basis.

Rollover Equity: Deferred Recognition via Partnership Structures

In private-equity acquisitions, the selling founders or management often retain “rollover” equity in the acquirer entity. The rollover is structured as a contribution to a partnership (typically under §721) in exchange for an interest in the partnership.

§721 provides non-recognition of gain on contribution of property to a partnership in exchange for a partnership interest. The seller’s basis in the contributed property becomes basis in the partnership interest. No current tax.

Subsequent distributions from the partnership may be taxable or non-taxable depending on structure. An ordinary distribution out of basis is non-taxable; a distribution in excess of basis triggers capital gain.

Rollover equity creates a deferred gain that is eventually recognized on the later sale of the partnership interest or a subsequent PE-sponsor exit event (typically 3-7 years after initial rollover).

Example: founder sells $50M of company stock in a PE acquisition. 70% is cash ($35M), 30% is rollover equity ($15M). At closing:

Cash portion: $35M, gain $34.5M (if basis is $500K allocated proportionally).
Rollover equity: $15M FMV, rolled over under §721 with $150K basis (proportional).
No gain recognized on rollover portion.

Three years later, PE sponsor sells the company. Founder receives $35M for her $15M rollover position. Gain recognized at that exit: $35M minus $150K basis = $34.85M. Taxed as long-term capital gain (typically) subject to 23.8% federal plus state.

Rollover equity is common in PE buyouts. The tax deferral is valuable, but the seller takes on re-investment risk in the acquirer entity.

Earnouts and Deferred Consideration

An earnout pays additional consideration if post-closing metrics are met (revenue targets, customer retention, product milestones). The tax treatment depends on whether the earnout is compensation or purchase price.

If compensation (for continued services by the seller post-closing), earnout payments are ordinary income at payment under §83 or §61. Withholding applies as employment income.

If purchase price (contingent acquisition payment unrelated to services), earnout payments are capital gain at payment under the installment method of §453, unless the seller elects out of installment method.

The distinction between compensation and purchase price earnout is tested by the Seggerman factors: whether the seller is required to remain employed, whether the earnout is proportional to ownership, whether it is paid regardless of continued employment.

For a seller whose earnout is structured as purchase price, §453 installment method spreads the gain recognition across the payment years. Each payment carries an imputed interest component (ordinary income) and a gain component.

Seller Notes and Deferred Payments

Some acquisitions include seller financing: the seller takes a note from the buyer for part of the purchase price. Principal payments on the note are treated under installment method: each payment carries a proportional gain recognition and imputed interest.

Applicable federal rates (AFR) under §1274 must be charged on seller notes to avoid imputed interest. The short-term AFR (under 3 years), mid-term (3-9 years), and long-term (over 9 years) rates are published monthly by the IRS.

Seller notes defer gain recognition and may place some of the gain into lower-bracket years if the seller’s income varies. They also create credit risk on the buyer; if the buyer cannot repay, the seller is an unsecured creditor.

The Section 338(h)(10) Election

In an acquisition of an S-corporation, a §338(h)(10) election allows the buyer to treat the stock acquisition as an asset acquisition for tax purposes. The selling shareholders pay tax on the deemed asset sale inside the corporation plus the subsequent liquidation. The buyer gets a step-up in the basis of acquired assets.

For S-corp sellers, the election typically increases the selling shareholders’ tax burden (gain on asset sale is ordinary to the extent of depreciation recapture) but provides a higher purchase price from the buyer (who values the basis step-up). The net benefit depends on the specific asset mix and parties’ tax positions.

A similar election under §336(e) allows QSub and other pass-through structures to achieve comparable treatment.

The F Reorganization

Buyers sometimes structure acquisitions as a §368(a)(1)(F) “reorganization of identity, form, or place” to achieve tax-efficient outcomes. F reorganizations are commonly used to convert an S-corp into a partnership structure for subsequent acquisition, preserving S-corp tax benefits while achieving desired structure.

Complex planning territory. Work with experienced M&A tax counsel.

Planning Moves Pre-Closing

For a seller with material equity facing an upcoming acquisition:

Negotiate consideration mix based on personal tax situation. If you have offsetting losses, cash consideration uses them. If you lack losses, rollover equity defers the gain.
Complete QSBS stacking before closing. Post-closing transfers of acquirer stock don’t qualify as QSBS transfers of target stock.
Use lifetime gift exemption before closing. Pre-closing stock is valued at closing-date FMV for gift tax purposes if gifted close to closing. Earlier gifts use lower valuations.
Consider a §1045 QSBS rollover plan. If the stock is QSBS and you want to defer beyond §1202 exclusion, have a target QSBS for the 60-day rollover window.
Analyze state tax exposure. Relocate if possible before closing. Installment method may spread gain across multiple tax years and allow partial relocation benefit.
Review employment agreements. Post-closing employment terms affect whether earnouts are compensation or purchase price.

Frequently Asked

Does a SPAC merger receive different treatment than a traditional M&A? No. The tax mechanics depend on the consideration structure, not whether the buyer is a SPAC. Most SPAC mergers are structured as taxable stock-for-stock with cash component.

Can I elect installment method on any deal? §453(k) excludes publicly traded stock from installment method. Private-company stock sold in a taxable transaction generally qualifies. Mark-to-market elections under §453(k) can sometimes apply.

What if the deal doesn’t close? Costs incurred preparing for the deal may be deductible under §83(h) for compensation items or capitalized into the unclosed investment. Consult tax counsel for specific treatment.

Does §1202 apply to stock received in a §368 reorganization? Potentially. §1202(h) has specific rules for transferred basis. Stock received in a qualifying reorganization can retain QSBS character if certain tests are met. Complex; work with counsel.

What about the 2026 TCJA expirations affecting M&A tax? Lifetime gift exemption drops to roughly $7M (from $13.99M). Individual top marginal rate at 39.6% instead of 37%. QBI deduction expires. Monitor for post-2026 deal structures.