The Business Exit Tax Planning Guide

The gap between price and proceeds

Most business owners think about an exit in terms of the purchase price. The more important number — the one that determines how your life actually changes — is what you walk away with after taxes. That gap is not small.

In a California asset sale, a $5M deal might produce $2.8–3.2M in after-tax proceeds after federal capital gains tax (20%), net investment income tax (NIIT, 3.8%), and California state tax (13.3%). The same $5M deal structured differently — stock sale with QSBS qualification and an installment election — might produce $3.8–4.2M. That difference is not a rounding error.

This guide covers the four factors with the most impact on your net proceeds: deal structure (asset vs. stock), QSBS eligibility (QSBS is a federal exclusion for gain on qualifying small-business stock, covered below), installment sale elections, and California’s exit tax. All of them need to be addressed before the deal is signed.

Asset sale vs. stock sale

The most consequential structural decision in any business sale is whether it’s structured as an asset sale or a stock sale. Buyers and sellers often have opposing interests here — and understanding why helps you negotiate more effectively.

Why buyers want asset deals

In an asset deal, the buyer acquires specific assets and liabilities — not the legal entity. This gives the buyer a stepped-up tax basis (basis is the number used to measure gain or loss when an asset is later sold) in the acquired assets. They can depreciate and amortize that higher basis, creating significant future tax deductions. It also allows the buyer to leave behind unknown liabilities (lawsuits, tax disputes, environmental issues) that might exist in the entity.

Why sellers prefer stock deals

In a stock deal, the seller transfers ownership of the legal entity and all of its assets in one transaction. The tax result is typically cleaner for the seller: the entire gain is treated as long-term capital gain taxed at 20% (plus NIIT) — not the mixed ordinary income and capital gains treatment of an asset deal.

• Asset deal tax treatment for seller: Goodwill → long-term capital gain. Equipment → §1245 recapture (the depreciation you already deducted gets taxed back) at ordinary rates. Non-compete → ordinary income. Inventory → ordinary income.
• Stock deal tax treatment for seller: Entire gain → long-term capital gain, assuming you held the shares for more than a year.
• The negotiation: Buyers often pay a premium for asset deals (the tax benefit to them is worth something). That premium may or may not offset the seller’s tax disadvantage.

QSBS: the exclusion most owners miss

Section 1202 of the Internal Revenue Code provides one of the largest potential tax benefits available to small business owners — and most of them have never heard of it. If your shares qualify as Qualified Small Business Stock (QSBS), you can exclude up to $15 million of capital gain from federal income tax entirely.

California does not conform to the QSBS exclusion. State capital gains tax applies regardless of QSBS status. But at a potential federal tax saving of $3 million or more on a $5M+ transaction, the California tax is still a secondary concern.

The qualification requirements

• C corporation only: The company must have been a C corporation when you acquired your shares. S-corps, LLCs, and partnerships do not qualify.
• Original issue: You must have acquired the shares directly from the company, not purchased them from another shareholder.
• Assets under $50 million: The company’s aggregate gross assets must have been under $50 million at the time of issuance (and immediately after).
• Active business: The company must be in a qualified trade or business — most services businesses qualify, but certain professional services (health, law, accounting, financial services) do not.
• Five-year holding period: You must have held the shares for more than five years before the sale.

If your company has been a C-corp since formation, you’ve owned your shares for five years, and the company stays under $50M in assets — the QSBS check is the first thing to run before any sale discussion.

Installment sales

An installment sale is a deal where you receive the purchase price over time — in annual or periodic payments rather than a single lump sum at closing. The tax benefit is that you recognize gain only as you receive payments, which can spread the tax liability across multiple tax years.

Why installments can improve after-tax proceeds

Consider a $3M gain recognized in a single year. The full gain is taxed at the top marginal rate (20% LTCG + 3.8% NIIT + 13.3% CA for California residents = ~37% effective). Spread across five years at $600k/year, each year’s payment might fall in a lower bracket — particularly if you retire and have no other significant income in those years.

• Spreading gain across years reduces the effective rate if your other income is lower post-exit
• The installment election is made on your tax return for the year of sale — you can opt out if a lump sum is better
• Interest is imputed on installment notes — the IRS requires a minimum interest rate; if the deal doesn’t specify one, they impute it
• If the buyer sells the business before all payments are made, you may have to recognize the remaining gain immediately

California exit tax

California taxes capital gains from the sale of a business even if you have already moved out of the state. If the business is a California entity and the gain has a California source, California will tax it — regardless of where you live at the time of sale.

This catches many owners off guard. The sequence is: sell the business, move to Nevada, assume the California tax problem is solved. But if the sale proceeds were sourced in California — because the business operated there, had assets there, had customers there — California can and does tax those gains.

• Residents of California at time of sale: all gain taxed in California at 13.3%
• Former residents who moved before sale: California may still source some or all gain to California depending on entity type and asset location
• S-corp stock sales: gain is generally sourced where the business operated — moving does not eliminate California exposure if the company is a California entity
• Pre-sale planning: residency changes need to be real, completed, and well-documented — California audits moves in connection with high-value asset sales

What to do before the LOI

The period before a letter of intent is the highest-leverage window in any business exit. Once the LOI is signed, deal structure is substantially negotiated. Many of the tax elections that matter have effectively been made by default.

The five things that need to happen before any LOI is signed:

• Run a pre-sale tax analysis. Model the after-tax proceeds under at least three scenarios: asset deal, stock deal, installment sale. Know your number before you negotiate.
• Check QSBS eligibility. If you qualify, this is worth millions of dollars in federal tax savings. It needs to be confirmed — not assumed.
• Review entity structure. Was the business set up for operations or for a transaction? Are you in the right entity type? Has anything changed since formation that affects your tax position?
• Assess California residency. If California tax is a concern and a move is possible, the timeline to execute that move is longer than most owners expect.
• Get your CPA and advisor in the same room. The sale proceeds fund your personal financial future. Investment strategy, income replacement, and tax planning on the proceeds all require coordination before closing — not after.

These decisions have hard deadlines — most of them set by the LOI or the nature of the asset being sold (QSBS holding periods, residency windows). Buyers are motivated. The timeline compresses fast. The planning needs to start before the buyer shows up at the table.