Asset Purchase vs Stock Purchase: The Tax Fight That Decides Who Keeps the Savings

If you are selling a Bay Area small business, or buying one, the structure of the deal will quietly decide who keeps several hundred thousand dollars of after-tax value. The two sides of the table almost never want the same thing. The buyer wants an asset purchase so they can step up basis in every depreciable asset and amortize goodwill over 15 years. The seller wants a stock purchase so the entire gain is capital and there is no recapture, no double tax, and a clean exit.

On a $5 million sale of a profitable Bay Area service or SaaS company, the gap between those two outcomes is real. We routinely see $300,000 to $700,000 of tax value created or destroyed depending on how the deal is papered. This guide walks the buyer's logic, the seller's logic, the §338(h)(10) and §336(e) elections that can bridge the two, the §1060 allocation that determines exactly how the asset side breaks down, and the California layer that makes all of it more expensive than it would be in Texas or Florida.

We work through these structures regularly with founders and operators at our business tax practice at Silicon Valley Tax.

The Core Conflict

Every M&A negotiation between two private parties contains the same hidden tax fight. The same dollar of purchase price produces very different after-tax results depending on whether the transaction is structured as a transfer of assets or a transfer of stock. The fight is not philosophical. It is dollars.

In an asset sale, the buyer takes title to specific assets (equipment, customer lists, goodwill, intellectual property, leases) and assumes only the liabilities it agrees to assume. The buyer's basis in each acquired asset becomes the price allocated to it under IRC §1012. Tangible property is depreciated under MACRS, and §197 intangibles (most importantly, goodwill, going concern value, customer lists, non-competes, and workforce in place) are amortized straight-line over 15 years. That amortization is a real cash tax shield.

The seller, in the same asset sale, takes the hit. Receivables convert to ordinary income at collection. Inventory is ordinary. Depreciation recapture under IRC §1245 on equipment, and unrecaptured §1250 gain on real property under IRC §1250, get pulled out at ordinary or 25% rates instead of long-term capital gains rates. And if the seller is a C corporation, the corporation pays tax on the asset sale gain, then the shareholders pay tax again on the liquidating distribution. That second layer is the classic C-corp double tax that often makes an asset sale economically untenable for a C-corp seller.

In a stock sale, the buyer purchases the seller's shares. The corporation continues to exist with the same EIN, the same contracts, the same bank accounts, and the same historic tax basis in its assets. There is no step-up. The buyer inherits everything, good and bad: unknown tax positions, contingent liabilities, pending litigation, the lot. The seller, on the other hand, sells a single capital asset (the stock) and reports a single layer of long-term capital gain.

Why the Buyer Wants Assets

From the buyer's seat, the asset structure has four big advantages:

• Step-up basis under §1012. The buyer's basis in each acquired asset equals what it paid, not what the seller had on the books. Depreciable assets get a fresh MACRS schedule. That generates new depreciation deductions the seller had already used up.
• §197 amortization on goodwill. Under IRC §197, the buyer amortizes acquired goodwill, going concern value, customer lists, non-competes, workforce in place, and most other purchased intangibles straight-line over 15 years. On a $5M deal with $3M allocated to goodwill, that is $200K per year of pure tax shield, $42K of cash tax savings at 21% federal C-corp rates or $74K at 37% individual rates.
• No inherited liabilities. Asset purchase agreements let the buyer cherry-pick which liabilities to assume. Pending lawsuits, unknown tax exposure, prior-year sales tax assessments, employment claims, none of it follows the assets unless the buyer agrees.
• No inherited tax positions. The seller's prior aggressive R&D credits, transfer pricing positions, or NOL utilization choices stay with the legal entity the seller still owns. A clean asset deal starts the buyer at a known position.

For a strategic buyer paying full price, those four factors usually move them firmly into the asset camp before the term sheet is signed.

Why the Seller Wants Stock

The seller's preference list is the mirror image:

• Single layer of capital gains. A stock sale is a sale of one asset (the shares) at long-term capital gains rates if held over a year. Top federal rate is 20% plus 3.8% NIIT, total 23.8%, no recapture surcharge.
• No depreciation recapture. Selling stock does not trigger §1245 or §1250 recapture inside the company. All the gain stays capital.
• Transfer of liabilities. For sellers with a messy company (old payroll tax exposure, environmental issues, ambiguous contractor classifications), stock sale dumps the problems on the buyer. This is one reason buyers of distressed or compliance-questionable companies demand asset structures with explicit indemnities.
• QSBS exclusion possibility. If the corporation is an eligible C-corp and the shares were held five years, the seller may exclude up to $10 million of federal capital gain (or 10x basis if higher) under §1202 for stock issued before July 5, 2025. The One Big Beautiful Bill Act (OBBBA, Public Law 119-21, signed July 4, 2025) expands the cap to $15 million and introduces a tiered exclusion at 3 and 4 years for QSBS issued after that date. We covered the full mechanics in our QSBS / Section 1202 guide. Asset sales generally do not qualify for the QSBS exclusion at the shareholder level.

The §338(h)(10) and §336(e) Elections

The most common bridge between the two camps is a joint tax election that lets the deal be a stock sale legally but an asset sale for federal income tax purposes. There are two versions in current practice:

• §338(h)(10) applies when the target is an S corporation, or a corporate subsidiary inside a consolidated group, and the buyer is a corporation. Both buyer and seller must consent. The seller's gain is recomputed as if the corporation sold its assets and liquidated, and the buyer takes stepped-up basis in those assets.
• §336(e) is the parallel election that works when the buyer is a partnership, LLC, or individual (cases where §338(h)(10) does not apply because of its corporate-buyer requirement). It produces the same deemed-asset-sale result. Only the seller files; buyer consent is required by contract but not by form.

These elections matter most for S corporation targets. The S-corp shareholders already get one layer of tax (no C-corp double tax), so a deemed asset sale does not penalize them the way it would a C-corp seller. The buyer gets the step-up and §197 amortization. Both sides win, and the negotiation shifts from "asset versus stock" to "what does the buyer pay extra for getting the step-up."

For C-corp targets, neither election is generally available outside the consolidated-group context. The C-corp double tax problem on an asset sale stays unsolved, which is why C-corp sellers almost always insist on a true stock sale and accept the lower price the buyer is willing to pay without the step-up.

Pricing the Gap: a $5M S-Corp Sale

Let's walk a Bay Area example. A San Jose SaaS company, S-corp election in place, single owner with $0 basis in shares, sells for $5 million cash. Of that, $200K is tangible equipment with $50K of remaining book basis (so $150K of §1245 recapture if asset-sold), $3M is goodwill, $300K is customer lists, $500K is a non-compete, and the balance is working capital. Round numbers for clarity.

Path A: pure asset sale

Seller's tax (S-corp passes through):

• §1245 recapture on equipment: $150K at ordinary rates (37% federal + 13.3% CA) = ~$75K
• Goodwill, customer lists, non-compete: $3.8M at long-term capital gains (23.8% federal + 13.3% CA + 1% mental health on portion over $1M) = ~$1.4M
• Total seller federal + CA tax: roughly $1.5M on a $5M sale

Buyer's benefit: $3M goodwill + $300K customer lists + $500K non-compete = $3.8M of §197 intangibles amortized over 15 years = $253K/year deduction. At 21% C-corp rate, that is $53K/year of federal cash tax savings, or about $530K of nominal value over 15 years (NPV around $400K at a reasonable discount rate). Plus accelerated depreciation on equipment basis.

Path B: pure stock sale (no election)

Seller's tax:

• $5M long-term capital gain at 23.8% federal + 13.3% CA = roughly $1.2M
• No recapture. No ordinary income. Clean.

Buyer's benefit: zero step-up. Continues depreciating $50K of remaining equipment basis. No §197 amortization on goodwill (you cannot amortize stock basis).

Path C: stock sale with §338(h)(10) election

Seller's tax: same as Path A, ~$1.5M, because the deemed-asset-sale rules treat it as if the corporation sold its assets.

Buyer's benefit: same as Path A, ~$400K NPV from the step-up and §197 amortization.

The negotiated gross-up

The seller is $300K worse off in Path A or C versus Path B. The buyer is $400K better off in Path A or C versus Path B. There is $300K to $700K of value sitting on the table in the structure choice. Sophisticated parties negotiate a "tax gross-up": the buyer agrees to pay the seller an extra $300K (or some split of the gap) in exchange for the seller agreeing to the §338(h)(10) election. Both sides land better than the no-election stock sale, and the buyer captures most of the remaining value. We see this routinely.

The §1060 Allocation

In any asset sale (or deemed asset sale under §338(h)(10) / §336(e)), the parties must agree on how the total purchase price gets allocated across asset classes. IRC §1060 sets the framework. Both buyer and seller file IRS Form 8594 with their return for the year of sale, and the allocations must match. Inconsistent filings draw audit attention immediately.

The seven asset classes, in order of allocation priority:

• Class I: Cash and demand deposits
• Class II: Actively traded personal property (securities, foreign currency)
• Class III: Accounts receivable, mortgages, credit card receivables
• Class IV: Inventory and stock in trade
• Class V: All other tangible assets (equipment, furniture, real estate, vehicles)
• Class VI: All §197 intangibles other than goodwill and going concern (customer lists, non-competes, trade names, workforce, IP)
• Class VII: Goodwill and going concern value

The buyer wants to push as much of the price into Class V (faster depreciation) and Classes VI and VII (15-year amortization on intangibles). The seller wants to push allocation away from Class III and IV (ordinary income) and Class V (recapture) and toward Class VII (clean capital gain). The actual allocation must reflect fair market value, but within reasonable FMV ranges, negotiation matters. Two appraisers can defensibly land $200K apart on goodwill versus customer lists.

California: the Extra Layer

Bay Area sellers face an extra layer of complexity from California tax law that out-of-state buyers and sellers often miss.

First, California tacks on roughly 10.3% to 13.3% state tax on the gain regardless of structure (no QSBS exclusion at the state level; California does not conform to §1202). Even when the federal tax on a $5M sale could be near zero under QSBS, the California Franchise Tax Board can still take over $500K. We covered this in detail in our QSBS guide and our Delaware vs California incorporation analysis.

Second, California does conform to §338(h)(10) and §336(e) for federal-following purposes, but the FTB scrutinizes nexus and apportionment closely. Multi-state buyers integrating a California target need to map sales factor and property factor implications before closing, especially if the target's customer base extends beyond California.

Third, California's S-corp election follows the federal election but adds a 1.5% franchise tax on the S-corp's net income (minimum $800 per year). Separately, California imposes a 1.5% built-in gains recognition tax on certain gains recognized during the recognition period after a C-to-S conversion under Cal. R&TC §23809. Both rules can apply to the modeling in Path A and Path C above, layering roughly $75K to $150K on a $5M deal, which is usually absorbed into the negotiation but should be modeled explicitly.

If you are operating as an LLC or S-corp and contemplating a future sale, our S-corp vs LLC analysis and LLC-to-S-corp conversion guide walk through the upstream structure choices that determine which paths are even available at exit.

Practical Negotiation Sequence

For Bay Area founders going through a sale, the sequence we recommend with our M&A clients:

1. Model both structures before the LOI. Run Path A, B, and C with real numbers. Know your floor and ceiling on after-tax proceeds before you receive the buyer's first term sheet.
2. Know your entity type. S-corp owners have §338(h)(10) on the table. C-corp owners do not (outside consolidated groups) and should plan for a true stock sale or accept the double-tax cost of an asset sale.
3. Get §1060 allocation in the LOI. The earlier you nail down the allocation, the less room the buyer has to push value into ordinary-income categories at the closing table. Bake at least the goodwill versus customer-list versus non-compete split into the term sheet.
4. Engage a transaction tax advisor early. M&A tax is materially different from compliance work. The mistakes are six-figure, irreversible, and usually invisible until the K-1 lands.
5. Plan for California separately. Federal optimization does not solve California. Residency change, trust planning, or charitable structures all need 12 to 18 months of runway.

What Goes Wrong Without a CPA

The most common pattern we see at intake: a founder sold their S-corp in a "straightforward stock sale" three years ago because the buyer's broker said it was simpler, and never modeled Path C. On a $5M sale that translated to roughly $300,000 of foregone after-tax value that the buyer pocketed. The founder did not know the §338(h)(10) election existed, the broker did not raise it, and the deal closed without negotiation around the gap.

DIY M&A guidance from a transaction broker is not the same as transaction-tax modeling. Brokers run process; they do not model §1060 allocations, §338(h)(10) elections, or California built-in gains exposure. Those are six-figure items that require dedicated tax counsel before the term sheet is signed.

Frequently Asked Questions

Can I do a §338(h)(10) on a C-corp?

Generally no. §338(h)(10) requires the target to be either an S corporation or a subsidiary in a consolidated group with the seller. A standalone C-corp does not qualify. A regular §338(g) election exists for C-corp acquisitions, but for domestic U.S. deals it triggers double tax (corporate-level gain on the deemed asset sale plus shareholder-level gain on the actual stock sale) and is rarely used outside specific cross-border or NOL-utilization fact patterns. §338(g) is more common in foreign-target acquisitions where the corporate-level gain does not create a domestic tax cost.

What if the buyer wants to keep the EIN?

An asset sale generally requires the buyer to obtain a new EIN, because the legal entity holding the assets changes. If the buyer needs continuity of EIN for licensing, contracts, vendor relationships, or payroll, the structure leans toward stock sale. A §338(h)(10) election preserves the EIN (it is legally a stock sale) while delivering the asset-sale tax result to the buyer. This is one of the practical reasons §338(h)(10) is so common for S-corp deals.

Does §197 apply to internally developed goodwill?

No. §197 only applies to acquired intangibles. Internally developed goodwill, customer relationships built organically, and self-created intellectual property are not amortizable under §197 for the original owner. When that owner sells the business in an asset deal, the buyer's allocated price for that goodwill becomes the buyer's amortizable §197 basis. This is one of the structural reasons buyers prefer asset deals: they get an amortization deduction the seller never had.

How do earnouts get taxed in an asset versus stock sale?

Earnouts in an asset sale are generally taxed under the installment method (§453) and follow the asset class to which they relate (capital or ordinary). Earnouts in a stock sale are generally capital, taxed as additional consideration for the stock when received. Imputed interest applies under §483 or §1274 if the earnout extends more than one year. The character difference can be material when an earnout is tied to revenue (ordinary in asset sale) versus simple price contingency (capital in stock sale).

If I sell goodwill from an S-corp, is it ordinary or capital?

Goodwill held by a corporation and sold in an asset sale is a capital asset to the corporation and produces long-term capital gain at the entity level. Because an S-corp passes through gain to shareholders preserving its character, the shareholders report long-term capital gain on their personal returns. The 1990s-era "personal goodwill" doctrine (the Martin Ice Cream case) allows shareholders to sell personally owned goodwill separately from corporate goodwill in specific fact patterns, which can be valuable for C-corp owners trying to avoid double tax. Personal goodwill claims are heavily scrutinized and require contemporaneous evidence that the goodwill belongs to the individual, not the corporation.

What does Form 8594 actually look like at audit?

Form 8594 is a one-page schedule (with a continuation page for additional asset classes) that both buyer and seller file with the tax return for the year of sale. The IRS cross-references the two filings. If the allocations do not match, both returns get flagged and the parties may be required to file amended returns or face audit adjustment. Sophisticated parties draft a single allocation schedule, sign it as part of closing, and both file from the same numbers.

When to Talk to Us

M&A structure decisions in the Bay Area are made too late more often than not. By the time the LOI is signed, the structure is usually locked, and the seller has often given away $200K to $700K of after-tax value without realizing it. The right time to start modeling structure is when an exit becomes plausible, not when the term sheet arrives.

At Silicon Valley Tax, we advise sellers and buyers on S-corp and C-corp exit modeling, §338(h)(10) and §336(e) election mechanics, §1060 allocation negotiation, QSBS interaction with M&A, California-specific planning, and the post-closing compliance work that comes with every deal. If you are six to twenty-four months out from a possible sale, or sitting on an LOI right now, we can walk through your specific structure before the wire hits.

Schedule a complimentary consultation and we will model your sale under each of the three paths above, identify where the structure gap is, and lay out the negotiation moves that capture as much of that gap as possible.