Selling Your Small Business: Tax Planning Guide 2026
For most small-business owners, the sale of the business is the single largest financial event of their lifetime — often worth more than their entire retirement account balance. The tax decisions you make before you sign a letter of intent determine how much of the sale price you actually keep. Here's what those decisions are and why they require a specialist.
Asset sale vs. stock sale: the foundational choice
Almost every business purchase comes down to one structural question: is the buyer purchasing the assets of the business or the ownership interest (stock in a corporation, membership units in an LLC)?
Buyers almost always prefer asset purchases. When a buyer buys assets, they get a fresh "stepped-up" cost basis in everything they acquire — equipment, goodwill, customer lists. That means more depreciation going forward, which reduces their taxes. A seller who agrees to an asset sale usually pays more taxes (for reasons explained below) and expects to be compensated with a higher purchase price.
Sellers generally prefer stock sales. In a stock sale, the seller's entire gain is typically treated as long-term capital gain — taxed at 15% or 20% plus the 3.8% Net Investment Income Tax (NIIT), not at ordinary income rates of up to 37%.
For S-corps and LLCs, there is a middle option: the parties can make a joint §338(h)(10) election (for S-corps) or a deemed-asset-sale election that lets a stock sale be treated as an asset sale for tax purposes, with the buyer getting the step-up they want. In practice, this is often used when a buyer insists on step-up basis but the seller has negotiated a premium in the price to compensate for the higher tax cost.
How different assets are taxed in a sale
In an asset sale, the purchase price must be allocated across the business's assets (per IRS Form 8594, both buyer and seller must file the same allocation). Not all assets are taxed the same way:
| Asset type | Tax treatment for seller | Rate |
|---|---|---|
| Cash, accounts receivable | Ordinary income | Up to 37% |
| Inventory | Ordinary income | Up to 37% |
| Equipment (§1245 property) | Depreciation recapture = ordinary income; excess = LTCG | Up to 37% on recapture, then 15–23.8% on excess |
| Real estate (§1250 property) | Unrecaptured §1250 depreciation taxed at 25% max rate; excess = LTCG | 25% on recaptured depreciation, then 15–23.8% on excess |
| Business goodwill (entity-level) | Capital gain (§1231 asset held >1 year) | 15–23.8% |
| Personal goodwill (individual-level) | Capital gain — but only if properly documented | 15–23.8% |
| Non-compete covenant | Ordinary income | Up to 37% |
| Customer lists, trade names | Capital gain (§1221/§1231) | 15–23.8% |
The allocation between goodwill and non-compete is frequently contested between buyers and sellers because they have opposite incentives. A buyer wants more in the non-compete (which they can amortize over 15 years); a seller wants more in goodwill (capital gain rate vs. ordinary income rate). The difference can easily exceed $100,000 in taxes on a $1M transaction.
2026 federal capital gains tax rates
Long-term capital gain (assets held more than one year) is taxed at three preferential rates in 2026:1
| Rate | Single — taxable income | MFJ — taxable income |
|---|---|---|
| 0% | Up to $49,450 | Up to $98,900 |
| 15% | $49,451 – ~$550,000 | $98,901 – $613,700 |
| 20% | Above ~$550,000 | Above $613,700 |
Plus the 3.8% NIIT. The Net Investment Income Tax adds 3.8% to investment income (including capital gains from business sales) once your Modified AGI exceeds $200,000 (single) or $250,000 (married filing jointly).2 These thresholds are not inflation-adjusted and have been the same since 2013 — meaning more sellers hit the NIIT every year. Most business owners selling a profitable business will pay the NIIT on most or all of their gain.
Combined maximum federal rate: 23.8% on long-term capital gains. State taxes are on top of this — California adds up to 13.3%, making the total effective rate over 37% even on capital-gain-treated proceeds in high-tax states.
The personal goodwill doctrine: the most underused tax tool
In a service business — consulting, professional practice, agency, technology services — most of the value is you: your client relationships, your reputation, your expertise. Courts have recognized that this value is personal to the owner, not an asset of the entity. When the goodwill belongs to you personally (not to the S-corp or LLC), you can sell it directly and receive long-term capital gain treatment, rather than having the entity sell goodwill that flows through as pass-through income.
Personal goodwill requires documentation: the owner must not have a pre-existing employment agreement with the entity that transferred their client relationships to the business, and the clients must demonstrably follow the individual, not the brand. If you're thinking about a future sale, structuring this correctly years in advance matters.
Installment sales under §453: spreading the tax bill
An installment sale allows the seller to receive the purchase price over multiple years. Each payment you receive contains a proportionate share of: (1) your cost basis (tax-free), (2) your capital gain (taxed at LTCG rates in the year received), and (3) any ordinary income portion (taxed immediately or as received, depending on the asset).
Why this matters: If you receive $2M in one year, you might push yourself into the 20% LTCG bracket and pay the NIIT on a larger portion. Spread the same $2M over 5 years at $400K/year and you may stay in the 15% LTCG bracket, avoiding or reducing NIIT exposure, and potentially deferring income into years when you have offsetting deductions.
The catch: If the underlying asset would generate ordinary income (inventory, recaptured depreciation), installment treatment doesn't help — that income is all recognized in year one regardless of payment timing. Installment treatment is most valuable on the capital gain portion — typically goodwill and equity in appreciated real estate.
Some sellers also use installment notes strategically: accepting a note from the buyer at a reasonable interest rate rather than an all-cash closing. The interest payments are additional income, but the principal gain is deferred. Buyers sometimes accept this structure because it reduces their cash requirement at closing — you finance part of the acquisition.
QSBS (§1202): the C-corp advantage
Qualified Small Business Stock (QSBS) under §1202 provides a federal capital gains exclusion on gains from selling stock in a qualifying C-corporation. The One Big Beautiful Bill Act (OBBBA, July 2025) significantly expanded these benefits for stock acquired after July 4, 2025:3
- Exclusion cap raised to $15 million per issuer (up from $10M), indexed for inflation beginning in 2027.
- Tiered holding periods: 50% exclusion after 3 years, 75% after 4 years, 100% after 5 years. (Pre-OBBBA stock still requires the full 5-year hold for 100% exclusion.)
- Gross asset limit raised to $75 million (up from $50M) — the C-corp's aggregate gross assets at the time of stock issuance must not exceed this threshold.
Important limitation: QSBS does not apply to S-corps, LLCs, or partnerships — only to qualifying C-corporations. It also excludes several industries: professional services (law, accounting, health, consulting, financial services), hotels, and restaurants. Most businesses targeted by this site — service-based S-corps and single-member LLCs — do not qualify for QSBS. If you incorporated as a C-corp, received investment capital, and are in a qualifying industry (technology, manufacturing, retail, distribution), QSBS is worth reviewing with a tax attorney before any sale.
What to do with the proceeds: funding retirement
The year you sell your business is often both your highest-income year and the year your existing retirement plan contributions matter most. Before the sale closes:
- Max out your solo 401(k). If you're still operating your business in the year of the sale, you can contribute up to $72,000 to a solo 401(k) — reducing your business income and potentially your capital gains bracket. See our solo 401(k) guide.
- Consider a cash balance plan wind-down. If you have an active cash balance plan, the sale is a liquidity event that allows you to roll it into an IRA or 401(k). See our cash balance plan guide.
- Roth conversions in lower-income years. If the installment sale spreads your gain over several years, there may be windows where a partial Roth conversion is efficient. See our Roth strategy guide.
- Estate planning before a large liquidity event. OBBBA made the $15M estate and gift tax exemption permanent, but transferring business interests before a sale — at a lower pre-sale valuation — remains a useful estate-planning technique if properly timed.
Get matched with a business-exit financial advisor
Why you need a financial advisor — not just a CPA — for a business exit
A good CPA handles the return. A financial advisor who specializes in business exits does something different: they model the transaction structure before any documents are signed, run scenarios across different purchase price allocations, estimate post-tax proceeds under each option, and coordinate with your CPA and M&A attorney to negotiate the right structure into the purchase agreement.
The difference is worth multiples of the advisory fee. The decisions that affect your after-tax proceeds — asset vs. stock sale, personal goodwill documentation, installment timing, retirement plan maximization in the exit year — are irreversible once the deal closes. A specialist who has done this before knows what to look for in the LOI draft.
Fee-only financial advisors (no commissions, no product sales) are particularly valuable here because their incentive is fully aligned with your after-tax wealth, not with selling you an annuity with your proceeds.
- Long-term capital gains tax rates and income thresholds for 2026: Tax Foundation — 2026 Tax Brackets and Federal Income Tax Rates; Kiplinger — IRS Updates Capital Gains Tax Thresholds for 2026. Values reflect IRS Revenue Procedure 2025-32 inflation adjustments. All thresholds based on taxable income.
- Net Investment Income Tax: 3.8% on lesser of net investment income or MAGI above $200,000 (single) / $250,000 (MFJ). Thresholds not inflation-adjusted since enacted. IRS Topic 559 — Net Investment Income Tax.
- QSBS §1202 changes under OBBBA (One Big Beautiful Bill Act, July 2025): $15M per-issuer cap, tiered holding periods, $75M gross asset limit. Applies to stock acquired after July 4, 2025. McLane Middleton — OBBBA Changes to the QSBS Regime; Grant Thornton — Enhanced Section 1202 Benefits. Pre-OBBBA stock (acquired before July 4, 2025) governed by prior rules ($10M cap, 5-year full hold).
- IRC §453 installment sale rules: IRS Publication 537 — Installment Sales. §338(h)(10) election for S-corps: Treas. Reg. §1.338(h)(10)-1. Asset allocation in business sales: IRS Form 8594 instructions.
Values verified as of May 2026. Tax law changes frequently — confirm current-year figures with your advisor before a transaction.