Buying a Business: Entity Structure Decisions That Affect Your Taxes for Years

Buying a business is one of the largest financial decisions most people ever make, and nearly every structural choice in the transaction has tax consequences that compound for years. The entity you select, whether you buy assets or stock, how the purchase price is allocated, and which elections you file in year one will determine your depreciation deductions, your capital gains exposure, and your effective tax rate long after closing day.

## Entity Type Selection: The First Decision That Shapes Everything Else

The legal entity you use to acquire and operate the business determines how profits are taxed, how losses flow, and what exit options are available down the road. This is not a decision to revisit later -- changing entity types after acquisition triggers tax consequences of its own.

S-Corporation. Profits and losses pass through to your personal return. You avoid the double taxation that C-Corps face (corporate tax plus shareholder tax on dividends). But S-Corps have restrictions: no more than 100 shareholders, all must be U.S. individuals or certain trusts, and only one class of stock is allowed. If your financing involves preferred equity from an investor, an S-Corp will not work. IRC Subchapter S, Sections 1361-1379, governs S-Corporation eligibility and taxation.

C-Corporation. The entity pays its own federal income tax at a flat 21% rate, and distributions to shareholders are taxed again as dividends. The double taxation sounds punitive, but C-Corps offer advantages for acquisitions: no restrictions on ownership, multiple classes of stock are allowed, and retained earnings can be reinvested at the 21% corporate rate without triggering personal income tax. If you plan to hold the business long-term and reinvest profits, the math can favor a C-Corp. IRC Section 11(b) sets the 21% flat corporate rate, established by the Tax Cuts and Jobs Act of 2017.

LLC taxed as a partnership. This is the most flexible option. Multi-member LLCs taxed as partnerships allow special allocations of income, deductions, and credits among members. You can structure carried interests, preferred returns, and waterfall distributions. Losses pass through to your personal return (subject to basis, at-risk, and passive activity limitations). The partnership agreement drives the economics, not corporate formality.

LLC taxed as a sole proprietorship (single-member). For a solo buyer, this is the simplest structure. All income and deductions flow to Schedule C. But it offers no liability protection beyond what the state LLC statute provides, and self-employment tax applies to all net earnings.

The entity choice also affects how you can eventually sell. S-Corp and partnership interests can be sold in ways that give the buyer a stepped-up basis through specific elections. C-Corp stock sales generally do not, which can make your business less attractive to the next buyer.

## Asset Purchase vs. Stock Purchase: The Buyer's Most Important Structural Choice

How the deal is structured -- whether you buy the company's individual assets or its stock/membership interests -- has the single largest impact on your tax position as the buyer. In almost every case, buyers prefer an asset purchase.

Why asset purchases favor the buyer. When you buy assets, you get a new tax basis in every asset equal to what you paid. Equipment, real estate, customer lists, patents, and goodwill all start fresh at their allocated purchase price values. You can depreciate tangible assets under current schedules (including bonus depreciation where available) and amortize intangible assets over 15 years under IRC Section 197.

Technical detail

Section 197 requires that most acquired intangible assets, including goodwill, going-concern value, customer lists, covenants not to compete, and similar items, be amortized ratably over 15 years (180 months).

Why stock purchases disadvantage the buyer. When you buy stock, the corporation's assets keep their old tax basis -- whatever the seller originally paid for them, minus depreciation already taken. You get no step-up. If the seller bought equipment for $200,000 ten years ago and it is fully depreciated, your depreciable basis in that equipment is zero, even though you just paid $2 million for the company. You lose years of deductions.

The Section 338(h)(10) workaround. In certain situations involving S-Corporations or subsidiaries, buyer and seller can jointly elect to treat a stock purchase as if it were an asset purchase for tax purposes. The buyer gets the stepped-up basis it wants; the seller reports the transaction as a deemed asset sale. This is often the compromise when the seller insists on a stock deal (for legal simplicity or to avoid reassigning contracts) but the buyer needs the tax basis.

Technical detail

IRC Section 338(h)(10) allows a "qualified stock purchase" of an S-Corporation or subsidiary to be treated as a deemed asset sale, giving the buyer a stepped-up basis in the target's assets. Both buyer and seller must jointly elect this treatment.

**A concrete example.** You buy a small manufacturing business for $3,000,000. In an asset purchase, suppose $800,000 is allocated to equipment (depreciable over 5-7 years), $400,000 to real estate improvements (depreciable over 39 years), and $1,800,000 to goodwill (amortizable over 15 years under Section 197). In year one alone, your depreciation and amortization deductions could exceed $300,000, depending on bonus depreciation availability. In a stock purchase without a 338(h)(10) election, those deductions could be close to zero if the seller had already depreciated the assets.

Purchase Price Allocation Under Section 1060

When you buy assets, you and the seller must agree on how the total price is allocated among the individual assets. This is not optional -- IRC Section 1060 requires both parties to use the residual method, allocating value across seven asset classes in a specific order, with any excess going to goodwill.

Technical detail

Section 1060 requires buyer and seller to allocate purchase price using the residual method prescribed in Treasury Regulation 1.338-6. Both parties report the allocation on IRS Form 8594. Inconsistent allocations between buyer and seller will attract IRS scrutiny.

The allocation matters because different asset types have different depreciation lives:

• Class I (cash and equivalents): No depreciation -- dollar for dollar, no tax benefit.
• Class II (actively traded securities): Typically market value, minimal allocation.
• Class III (accounts receivable, inventory): Deductible when collected or sold, relatively fast.
• Class IV (tangible property -- equipment, vehicles, furniture): Depreciable over 5 to 7 years for most business equipment. This is the most aggressive depreciation category.
• Class V (intangibles other than goodwill -- patents, customer lists, covenants not to compete): Amortizable over 15 years under Section 197.
• Class VI (Section 197 intangibles other than goodwill and going-concern value): Also 15 years.
• Class VII (goodwill and going-concern value): 15-year amortization under Section 197.

Why allocation strategy matters. Allocating more to equipment (Class IV) accelerates your deductions -- you write off the value over 5-7 years instead of 15. Allocating more to goodwill (Class VII) stretches the deductions over 15 years. A $500,000 shift from goodwill to equipment could generate $70,000 or more in additional depreciation per year for the first five years.

The catch: the seller's interests are opposite yours. The seller wants more allocated to goodwill (taxed at capital gains rates) and less to equipment (which triggers ordinary income recapture under IRC Section 1245). Allocation negotiation is a zero-sum game, and both parties report the same allocation on Form 8594. If your allocations do not match, the IRS notices.

Due Diligence: Tax Liabilities That Become Your Problem

In a stock purchase, you acquire the entity itself, including its entire tax history. Outstanding liabilities transfer with the stock. In an asset purchase, successor liability rules can still make you responsible for certain tax debts. Either way, tax due diligence is not optional.

Outstanding income tax liabilities. Request copies of the last three to five years of federal and state tax returns. Compare reported revenue to bank deposits and financial statements. Unexplained discrepancies signal unreported income that may generate future assessments -- assessments that land on the entity you just bought.

Payroll tax compliance. Payroll tax failures are among the most common and most aggressively enforced tax violations. Check that all federal and state payroll tax returns (Forms 941, 940, state equivalents) have been filed and paid. Unpaid payroll taxes carry the "trust fund recovery penalty" under IRC Section 6672, which can pierce the corporate veil and hold responsible individuals personally liable.

Technical detail

Section 6672 imposes a penalty equal to 100% of unpaid trust fund taxes (the employee's share of FICA and withheld income tax) on any "responsible person" who willfully fails to collect, account for, or remit them.

State nexus exposure. If the business has customers, employees, remote workers, or inventory in multiple states, it may have sales tax or income tax filing obligations (nexus) it has been ignoring. Post-acquisition, you inherit the exposure. After the Supreme Court's 2018 South Dakota v. Wayfair decision, economic nexus thresholds mean even remote sellers can owe sales tax in states where they have no physical presence.

Worker classification. If the business has treated workers as independent contractors who should have been employees, the back taxes, penalties, and interest can be substantial. An IRS reclassification triggers income tax withholding, FICA, and FUTA for all open years.

Goodwill Amortization Under Section 197

For most business acquisitions, goodwill is the single largest intangible asset -- the excess of the purchase price over the fair market value of identifiable tangible and intangible assets. Under IRC Section 197, acquired goodwill is amortized ratably over 15 years (180 months), beginning in the month of acquisition.

If you pay $3,000,000 for a business and allocate $1,800,000 to goodwill, your annual amortization deduction is $120,000 ($1,800,000 / 15 years). At a 37% marginal rate, that deduction saves you $44,400 per year in federal taxes for 15 years. The deduction is the same every year -- no declining balance, no front-loading.

One critical rule: Section 197 prevents you from writing off a single intangible asset faster than the 15-year period, even if it has a demonstrably shorter useful life. A five-year covenant not to compete acquired as part of a business purchase is still amortized over 15 years, not five.

Technical detail

Section 197(f)(1)(A) -- the anti-churning rules and the requirement that all Section 197 intangibles acquired in a single transaction be amortized over 15 years, regardless of actual useful life.

Earnout Tax Treatment

Many business acquisitions include earnout provisions -- additional payments to the seller if the business hits certain revenue or profit targets after closing. Earnouts create tax uncertainty for both parties.

For the buyer, the key question is whether earnout payments are treated as additional purchase price (added to basis and amortized) or as compensation to the seller (deductible as ordinary business expense). The structure of the earnout and the seller's post-closing role determine the treatment. If the seller stays on as an employee or consultant, the IRS may recharacterize earnout payments as compensation, which means you deduct them currently but owe payroll taxes.

If treated as additional purchase price, you allocate the additional payments under Section 1060 (same residual method) and amortize any additional goodwill over the remaining 15-year period. The IRS requires you to use the "open transaction" method for contingent purchase price unless you can establish the fair market value of the earnout at closing.

Technical detail

Treasury Regulation 1.1001-1(a) and Revenue Ruling 68-194 address the treatment of contingent purchase price as additional basis allocated under the residual method.

Financing Structure and Interest Deductibility

How you finance the acquisition affects your annual tax bill through the interest deduction -- or the limitation on it.

Debt financing. Interest on acquisition debt is generally deductible as a business expense, making debt the most tax-efficient way to finance a purchase. If you borrow $2,000,000 at 7% interest, the $140,000 first-year interest payment is deductible, saving you roughly $51,800 at a 37% marginal rate.

The Section 163(j) limitation. For businesses with average annual gross receipts exceeding $30 million (over the prior three years), IRC Section 163(j) limits the business interest deduction to 30% of adjusted taxable income (ATI). Excess interest carries forward indefinitely. Most small and mid-market acquisitions fall below this threshold and are exempt, but if you are acquiring a larger business or a business that is part of an aggregated group exceeding $30 million, this limitation can defer significant deductions.

Technical detail

Section 163(j) was substantially revised by the Tax Cuts and Jobs Act of 2017. For tax years beginning after 2025, the OBBBA modified ATI to again include depreciation and amortization deductions (reverting to pre-2022 EBITDA-based calculation). The $30 million gross receipts threshold is adjusted annually for inflation.

Seller financing. If the seller carries a note, your interest payments are deductible (subject to the same 163(j) rules) and the seller reports the interest as ordinary income. This can be a useful negotiating tool -- the seller's after-tax cost of financing may be lower than a bank's, allowing for a lower interest rate.

S-Corporation Election Timing

If you form a new corporation to acquire the business, you have 75 days from formation to file Form 2553 and elect S-Corporation status for the current tax year. Miss the deadline and you default to C-Corporation taxation for the entire year.

Technical detail

IRC Section 1362(b) — an election filed within 2 months and 15 days of the beginning of the tax year is effective for that year. For a newly formed corporation, the clock starts on the date of incorporation, first shareholder, or first asset acquisition, whichever comes first.

Late election relief is available under Revenue Procedure 2013-30 if you can show reasonable cause, but "I didn't know about the deadline" is not a strong argument. File the election before or at closing.

If you are buying an existing C-Corporation and want to convert it to an S-Corp, be aware of the built-in gains (BIG) tax under IRC Section 1374. For five years after the conversion, any gain recognized on assets that had built-in appreciation at the time of the S-Corp election is taxed at the corporate rate (currently 21%) in addition to passing through to shareholders.

Technical detail

Section 1374 imposes an entity-level tax on S-Corporations that converted from C-Corporation status, applying to net recognized built-in gain during the 5-year recognition period. The OBBBA maintained the 5-year recognition period established by the Protecting Americans from Tax Hikes (PATH) Act of 2015.

First-Year Deductions and Startup Costs

The tax code draws a sharp line between the costs of acquiring a going concern and the costs of starting a new business. As a buyer, you are dealing with both.

**Section 195 startup costs.** Expenses incurred before the business begins operations -- such as investigating the business, travel for due diligence, and pre-opening training -- are "startup costs" under IRC Section 195. You can deduct up to $5,000 in the first year, but this deduction phases out dollar-for-dollar once startup costs exceed $50,000. The remainder is amortized over 180 months (15 years), beginning in the month the business opens.

Technical detail

Section 195(b) allows a first-year deduction of up to $5,000, reduced by the amount total startup expenditures exceed $50,000. Costs not deducted in year one are amortized ratably over 180 months.

Example: You spend $62,000 on pre-acquisition due diligence, legal fees for investigating the business, and pre-opening training. Because your startup costs exceed $50,000 by $12,000, your first-year Section 195 deduction is reduced from $5,000 to zero ($5,000 - $12,000 = $0, but not below zero). The entire $62,000 is amortized over 180 months, yielding approximately $4,133 per year in deductions.

Section 179 and bonus depreciation. For tangible equipment and certain property acquired as part of the business, you may be able to deduct the full cost in year one using IRC Section 179 (up to $1,250,000 for 2026, subject to a phase-out threshold) or bonus depreciation. The availability and percentage of bonus depreciation has been changing -- for 2026, bonus depreciation is 40% under the TCJA phase-down schedule as modified by the OBBBA.

Technical detail

Section 168(k) provides bonus depreciation. The TCJA set 100% bonus depreciation for assets placed in service after September 27, 2017, through December 31, 2022, then phased down by 20% per year. The OBBBA extended 100% bonus depreciation through 2029 for assets placed in service after the date of enactment (2025).

Organizational costs. If you form a new entity for the acquisition, up to $5,000 of organizational expenses (legal fees for drafting the charter, partnership agreement, or LLC operating agreement) are deductible in year one under IRC Section 248 (corporations) or IRC Section 709 (partnerships), with the same $50,000 phase-out threshold. The remainder is amortized over 180 months.

## A Buyer's Timeline: Key Tax Decisions by Phase

Before closing:

• Choose entity type and file formation documents
• File S-Corp election (Form 2553) if applicable -- do not wait
• Structure as asset purchase unless legal reasons require stock
• Negotiate purchase price allocation with seller
• Complete tax due diligence (returns, payroll, nexus, worker classification)

At closing:

• Execute purchase agreement with explicit allocation schedule
• Record allocation in your books matching Form 8594
• Begin goodwill amortization clock (month of acquisition)
• Place acquired assets in service (triggers depreciation)

First tax return:

• File Form 8594 (asset acquisition statement) with your return
• Elect Section 195 treatment for startup costs
• Claim Section 179 and bonus depreciation on eligible assets
• Report any earnout payments under the correct method
• File state returns in all states where nexus exists