Key takeaways
- S-corp vs C-corp election affects your tax treatment significantly and cannot be changed quickly before a sale
- Installment sales spread gain recognition across years, useful when you expect lower future income
- QSBS exclusion (Section 1202) can eliminate up to $10M in capital gains entirely, but only if the stock qualifies
- Charitable structures and opportunity zone investments can defer or eliminate gain, but require pre-close setup
Why timing matters more than most founders realize
Tax planning for a business sale is not something that happens at the closing table. The decisions with the largest dollar impact, entity structure, stock qualification, pre-sale reorganization, charitable planning, must be made months or years in advance. By the time a letter of intent is signed, most of the tax outcome is already determined by choices that were made, or not made, long before.
The typical founder who has not engaged a tax advisor before engaging an investment banker is not choosing between strategies. They are accepting whatever outcome their current structure produces. In the lower middle market, that can easily mean a $1–3M difference in after-tax proceeds on a $15–20M transaction.
Pre-sale tax decisions by timing window
3+ years out
QSBS qualification check; entity conversion if beneficial; opportunity zone investment setup
12–24 months out
Compensation structure review; deferred compensation cleanup; pre-sale asset cleanup
6–12 months out
Installment sale modeling; charitable remainder trust setup; pre-sale reorganization if needed
At LOI
Asset vs stock election; 338(h)(10) negotiation; earnout tax characterization
At closing
Final structure confirmation; payment mechanics; escrow treatment
Entity structure: the decision most founders cannot change in time
The biggest structural tax decision is whether your business is a C-corp or a pass-through (S-corp, partnership, LLC). In an asset sale, the most common structure in lower-middle-market deals, C-corp shareholders face double taxation: corporate-level tax on the asset gains, then dividend tax when proceeds are distributed. Pass-through entities pay only once at the shareholder level.
Converting a C-corp to an S-corp before a sale can reduce this burden, but the IRS imposes a 5-year built-in gains (BIG) period. Assets that appreciated before the S-corp election are still subject to corporate-level tax if sold within 5 years. The conversion only fully benefits founders who plan 5 or more years ahead.
Entity structure tax treatment in an asset sale
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A stock sale from a C-corp avoids double taxation because there is only one level of tax, at the shareholder level. This is why PE buyers who want asset treatment sometimes negotiate a 338(h)(10) election, which treats the deal as an asset sale for tax purposes while structuring it as a stock sale legally. The seller typically demands a price premium to compensate for the higher tax burden a 338(h)(10) creates.
Section 1202 QSBS: the exclusion most founders overlook
Section 1202 of the tax code allows shareholders of qualified small business stock (QSBS) to exclude up to $10M in capital gains (or 10x their adjusted basis, whichever is greater) from federal tax. For founders who qualify, this is one of the most valuable provisions in the tax code, and one of the least understood.
Qualification requirements are specific: the company must be a C-corp (not S-corp, not LLC) when the stock is issued, must have less than $50M in gross assets at the time of issuance, must be engaged in a qualified trade or business (most manufacturing, technology, and service businesses qualify; professional services like law and consulting do not), and the founder must have held the stock for at least 5 years.
Maximum exclusion per taxpayer per company: $10M or 10x adjusted basis
Federal tax savings at 23.8% long-term capital gains rate on $10M exclusion: approximately $2.38M
Holding period required: 5 years
State conformity: varies significantly, California does not conform; most other states do
Stacking with trusts: spouses and certain trusts can each claim the exclusion separately, potentially doubling the benefit
The catch is that QSBS only applies to C-corp stock. S-corp shareholders and LLC members do not qualify. Founders who converted from C-corp to S-corp for pass-through treatment have likely forfeited QSBS eligibility on shares issued after conversion, and may have a decision to make about whether to convert back, depending on how much appreciation remains and the timeline to exit.
Installment sales, charitable structures, and other pre-close tools
For founders who cannot use QSBS (wrong entity type, too late to qualify, assets exceed the threshold), installment sales and charitable structures are the primary remaining tools.
An installment sale allows a seller to spread gain recognition across years, paying tax only as principal is received rather than all at once at closing. This is useful when a founder expects to be in a lower tax bracket in future years, or when spreading income avoids triggering additional surtaxes. The mechanics are straightforward for all-cash deals structured with a seller note; they are more complex with earnouts.
A charitable remainder trust (CRT) allows a seller to contribute pre-close stock to a trust, which then sells the stock tax-free, reinvests the proceeds, and pays the founder an income stream for life or a term of years. At the end of the trust term, the remaining assets pass to charity. The founder avoids immediate capital gains on the full sale, receives a partial charitable deduction at contribution, and draws income from the trust. This is not a tool for every transaction, it requires meaningful charitable intent and gives up control of the principal, but for founders with philanthropic goals and large expected gains, the math can be compelling.
Frequently asked questions
What is the best way to reduce taxes on a business sale?
The highest-impact tools are entity structure (pass-through vs C-corp), Section 1202 QSBS exclusion if you qualify, installment sale treatment, and charitable structures. All require pre-close planning, most of them years before the sale. A tax advisor specializing in business transactions should be engaged before an investment banker in most cases.
What is a 338(h)(10) election?
A 338(h)(10) election allows the parties to treat a stock sale as an asset sale for tax purposes. Buyers often prefer asset treatment because they get a stepped-up basis in the assets. Sellers who agree to a 338(h)(10) typically demand a higher price to compensate for the additional tax burden it creates. The election must be made jointly, neither party can do it unilaterally.
How far in advance should I do tax planning before selling my business?
The most impactful decisions, QSBS qualification, entity structure, need to be made 3–5 years before a sale. Installment sale and charitable structure planning can be done 6–24 months out. Compensation cleanup and deferred compensation structuring should happen 12–18 months before engaging a banker. Waiting until the LOI stage eliminates most planning options.
Work with Glacier Lake Partners
Discuss pre-sale tax planning for your transaction
Tax structure decisions must be made before the LOI. We help founders understand the trade-offs and coordinate with transaction counsel.
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