Do I need a special CPA for a business sale?

Yes. A transaction-experienced accountant does different work from a regular tax preparer. They model your tax exposure under different deal structures, document and defend add-backs for a quality of earnings review, and flag the issues that surface in due diligence before they become negotiating leverage for the buyer. Your current CPA may be excellent at annual tax returns but may not have done many M&A transactions. Ask how many business sales they've handled before and whether they've worked with buyers who run quality of earnings reviews. If the answer is few or none, bring in a transaction CPA alongside them.

Selling a Business · Tax Strategy

Tax planning before you sell a business

Q: What is QSBS and how does it reduce taxes when selling a business?

QSBS stands for qualified small business stock. Under IRC Section 1202, if you hold stock in a qualified C corporation for more than five years, you may exclude a significant portion of the gain from federal capital gains tax. For stock acquired after September 27, 2010, the exclusion is 100% of the gain, up to the greater of $10 million or 10 times your adjusted basis per issuer. The corporation must have had aggregate gross assets of $50 million or less when the stock was issued and must operate an active qualifying business (not professional services like law, healthcare, or financial services). State treatment varies; California, for example, does not conform to the federal exclusion. QSBS eligibility has to be structured into the entity years before a sale.

Q: What is a charitable remainder trust and how does it help sellers?

A charitable remainder trust (CRT) is an irrevocable trust you fund with appreciated stock before a sale. The trust sells the stock without paying capital gains tax (it's a tax-exempt entity) and uses the proceeds to pay you an income stream for a term of years or for life. At the end of the trust term, the remaining assets go to a charity you designate. You also get a partial charitable deduction for the present value of the charitable remainder. The key constraint: you've given up the asset. A CRT only makes sense if you have genuine charitable intent. The income you receive is taxable as it arrives, with different income tiers taxed in a specific order. These structures need to own the stock before any sale is triggered, so they can't be set up after an LOI is signed.

Q: Does an asset sale or stock sale produce better tax treatment for the seller?

It depends on your entity type and facts, and the difference can be significant. In an asset sale, the purchase price is allocated across asset categories that may be taxed at different rates, sometimes producing a mix of ordinary income and long-term capital gains. A stock sale is generally treated as the sale of an ownership interest, which may be more favorable for sellers. Buyers usually prefer asset deals for the basis step-up and liability protection. Where you end up is negotiated. Have a CPA and a transaction attorney model both structures with your actual numbers before you commit to either.

Q: Can I convert my S corp or LLC to a C corp to qualify for QSBS before selling?

A conversion to a C corporation would start a new five-year clock for QSBS purposes, since you need to hold qualifying C corp stock for more than five years from issuance. Converting shortly before a sale won't qualify you. If you're early enough in your ownership that a five-year hold is feasible before your target exit, it's worth having a CPA and tax attorney analyze whether conversion makes sense for your specific situation. There are also built-in gains tax considerations if you convert from an S corp to a C corp and then sell assets within a certain period.

Q: How far in advance should I start tax planning before selling my business?

Three or more years out is when the full range of strategies is available. That's the window for structural changes with holding-period requirements like QSBS, for setting up charitable trusts, and for getting a full model of your current tax exposure versus your after-tax goal. Two years out, you should have a plan in place and most structural changes completed. One year out, the focus shifts to deal structure, clean financials, and making sure your transaction CPA is engaged well before any letter of intent. By the time you're in the LOI stage, most of the large levers are gone.

The tax bill from a business sale can easily exceed the total fees you pay every advisor on the deal. Most of what you can do about it has to be set up in the years before closing, not the week you sign the LOI. Here's what to know about QSBS exclusions, installment sales, charitable trust structures, and how deal structure shapes what you keep.

TL;DR

QSBS: If you've held stock in a qualifying C corporation for more than five years, you may exclude up to 100% of gain under IRC Section 1202, up to $10M or 10x basis per issuer. This option has to be built into the entity long before you sell.
Installment sales: Accept payment over multiple years to spread the gain across tax years and reduce peak-year exposure. The tradeoff is credit risk on future payments and buyer resistance in many deals.
Charitable structures: A charitable remainder trust (CRT) can hold your stock before a sale, sell it tax-free inside the trust, and pay you an income stream. You've given up the asset to charity, so this only fits if you have genuine charitable intent.
Deal structure matters: An asset sale and a stock sale produce different tax outcomes for you as the seller. The choice gets negotiated, so understand both before you enter the room.
Lead time: Most of these strategies need 1 to 3 years to set up properly. Bring a transaction CPA in well before you start talking to buyers.

Why the planning window is years, not weeks

Most owners think about the tax bill after they've accepted an offer. By then, the biggest levers are already gone.

QSBS requires a five-year hold in a qualifying C corporation. A charitable trust has to own your stock before any sale is agreed. Even an installment sale, which can technically be structured at signing, works far better when a transaction CPA has reviewed the deal terms before they're final. And entity type, which is almost never changed mid-process, is the foundational variable that determines which strategies are even available to you.

The planning timeline that gives you real options: three years out, get a transaction-experienced CPA to model your current tax exposure under different deal scenarios and compare it to your after-tax goal. Two years out, make any structural changes that carry holding-period requirements. One year out, you should have a clear strategy locked in before you open the books to buyers.

If you're not sure what your business is worth today, the business valuation calculator gives you a starting point. You can't model the tax gap until you have a number to model against.

QSBS: the Section 1202 exclusion

IRC Section 1202 is one of the most valuable provisions in the tax code for founders and early shareholders. Under it, you may be able to exclude a large portion of your gain from federal capital gains tax entirely.

The mechanics: stock issued after August 10, 1993 in a qualifying C corporation, held for more than five years, can generate gain that's excluded at federal level. For stock acquired after September 27, 2010, the exclusion rate is 100%. The per-issuer limit is the greater of $10 million or 10 times your adjusted basis in the stock.

To qualify, the corporation must:

Have had aggregate gross assets of $50 million or less when the stock was issued (and immediately after)
Operate as an active business in a qualifying trade
Not be in an excluded field: professional services including law, health, consulting, financial services, banking, insurance, hospitality, farming, and a few others are specifically excluded

State tax treatment is its own question. California does not conform to the federal Section 1202 exclusion, which means a seller in California could have zero federal capital gains tax on a qualifying sale and still owe significant state tax. Other states vary. Your CPA needs to model state exposure separately.

The planning constraint that matters most: you can't create QSBS eligibility on the way to an exit. If your company is currently an LLC or S corporation and you're thinking about converting, a conversion to C corporation starts a new five-year clock. The strategy only works if the clock is already running.

Installment sales: spreading the gain over time

An installment sale means you accept payment from the buyer over multiple years rather than receiving the full price at closing. Under IRC Section 453, gain is recognized proportionally as payments arrive, not in a lump sum in the year of sale.

The benefit when it works: by spreading the income, you may stay out of the very top tax brackets and surtax thresholds in any single year. The 3.8% net investment income tax, for instance, applies above certain adjusted gross income thresholds. A single large closing year can push you past several of those lines at once; installment payments spread across years may keep you below them more often.

The tradeoffs are real and worth taking seriously:

You're extending credit to the buyer. If they default, you're in a recovery situation, not a seller's position.
Many institutional buyers, private equity firms, and larger acquirers prefer or require all-cash closings. Installment terms are more common in owner-operated deals and lower-middle-market transactions.
Some states tax the full gain in the year of sale regardless of how payments are structured federally. Know your state's treatment before you count on deferral.
Payments must carry interest at no less than the Applicable Federal Rate (AFR). That interest is ordinary income to you, not capital gain.

Done well, an installment sale can meaningfully change your after-tax proceeds. Done carelessly, the credit risk or state tax exposure can outweigh the benefit. Have your CPA model the full scenario, including state taxes, before you agree to terms.

Charitable structures: CRTs and when they make sense

A Charitable Remainder Trust (CRT) is an irrevocable trust you fund with appreciated stock before the sale. Because the trust is a tax-exempt entity, it can sell the stock without paying capital gains tax. The trust then holds the proceeds and pays you (and potentially a spouse) an income stream for a term of years or for life. At the end of the term, whatever remains goes to the charity you named when you set it up.

The tax mechanics: you take a partial charitable deduction today for the present value of the charitable remainder. The income stream you receive is taxable as it arrives, with different income tiers distributed in a specific order under federal tax rules. The net effect is that a larger pre-tax pool generates your income than if you'd paid gains first and invested the after-tax remainder.

Be direct about the constraint: a CRT requires genuine charitable intent. You've given up the asset. The remainder goes to charity when the trust ends. If philanthropy isn't part of your plan, a CRT is not a tax strategy; it's a charitable gift with tax advantages attached. Owners who use it typically have a cause they care about and would have made a charitable gift anyway.

A Charitable Lead Annuity Trust (CLAT) works in the reverse direction: the charity receives the income during the trust term, and your heirs receive the remainder. That's primarily an estate planning tool rather than an income tax strategy for the seller.

Both structures require the trust to own the stock before any sale is triggered or agreed. You cannot set up a CRT or CLAT after a letter of intent is signed and expect the tax treatment to hold. The planning window is well before the sale process begins.

Deal structure and what it means for your bill

Before any of the strategies above, deal structure is the foundational variable. An asset sale and a stock sale produce different tax outcomes, often by a meaningful margin.

Our guide to asset sale vs. stock sale explains the full mechanics. The core issue for sellers: in an asset sale, the purchase price gets allocated across asset categories. Some of those categories, goodwill is usually capital gain, but the allocation across other categories can produce ordinary income. A stock sale is generally treated as the sale of an ownership interest, which may be simpler and more favorable for you.

Buyers tend to prefer asset deals because they get a step-up in basis and can leave liabilities behind. Sellers often prefer stock deals for cleaner treatment and fewer contracts to reassign. Where the deal lands is negotiated.

Entity type adds another layer. C corporations selling assets face double taxation: corporate-level tax on the gain, then shareholder-level tax when proceeds come out. S corporations and LLCs generally pass gains through to owners directly, avoiding the entity-level tax. If your business is a C corporation and a buyer wants an asset deal, modeling that structure before you're deep into negotiations is not optional.

For a complete picture of how capital gains are calculated and taxed when you close, see our guide to capital gains tax when selling a business. It covers rates, recapture, state taxes, and how different deal structures affect your actual number.

Putting it together: what to do at each stage

Three or more years out: have a transaction CPA model your current tax exposure under two or three deal scenarios (current entity type, asset sale vs. stock sale, target exit valuation). This model shows you where the gaps are between what you'd net today and what you need. Any structural changes with holding-period requirements, including entity conversions for QSBS, happen here.

Two years out: finalize any structural decisions. Charitable trusts that need to hold pre-sale stock get set up in this window if they're part of your plan. Your exit planning and tax strategy should be running in parallel, not sequentially. The exit planning guide covers the full workstream alongside the financial and operational preparation.

One year out: the focus shifts to deal readiness. Clean financials, documented add-backs, and a transaction CPA already engaged before you see your first LOI. Buyers run quality of earnings reviews; you want your numbers to hold up before they do, not after. Knowing your strategy cold before the process starts is what separates reactive sellers from prepared ones.

None of this is legal or tax advice, and the specifics change with current law, your entity type, and your deal. But the pattern holds: the owners who keep the most from a sale are the ones who made deliberate decisions about structure and strategy years before they called a banker.

When you're ready to start a real conversation, get matched with a vetted M&A advisor. The matching is free to sellers, including no-retainer, success-only options. A good advisor will help you coordinate the M&A process with your transaction CPA so the deal structure and the tax strategy land together.

Tax planning before selling: FAQ

What is tax planning before selling a business?

Pre-sale tax planning is the work you do in the years before a sale to reduce how much of your proceeds goes to taxes. It covers understanding your current tax exposure, choosing the right deal structure, qualifying for exclusions like QSBS under IRC Section 1202, setting up charitable trust structures, and coordinating installment sale mechanics. Most strategies that move the needle require 1 to 3 years of lead time. By the time you're at LOI, the largest levers are mostly gone.

What is QSBS and how does it reduce taxes when selling a business?

QSBS is qualified small business stock. Under IRC Section 1202, if you hold stock in a qualifying C corporation for more than five years, you may exclude up to 100% of the gain from federal capital gains tax, up to the greater of $10 million or 10 times your adjusted basis. The corporation must have had aggregate gross assets of $50M or less when the stock was issued and must operate in a qualifying business (professional services, healthcare, financial services, and several others are excluded). State conformity varies; California does not conform. QSBS eligibility has to be structured into the entity years before a sale.

How does an installment sale work when selling a business?

In an installment sale, the buyer pays you over multiple years. Under IRC Section 453, you recognize gain proportionally as payments arrive instead of all in the year of sale. That can keep you out of the highest brackets and surtax thresholds in a single year. The main tradeoffs: you're extending credit to the buyer, many institutional buyers won't agree to installment terms, some states tax the full gain in the sale year regardless, and you must charge interest at the Applicable Federal Rate. Model state taxes before you count on deferral.

What is a charitable remainder trust and how does it help sellers?

A CRT is an irrevocable trust you fund with appreciated stock before a sale. The trust sells the stock without paying capital gains (it's tax-exempt) and pays you an income stream for a term of years or life. The remainder goes to charity at the end. You get a partial charitable deduction today and a larger pre-tax pool generating your income. The constraint: you've given up the asset. A CRT only makes sense with genuine charitable intent. The trust must own the stock before any sale is agreed.

Does an asset sale or stock sale produce better tax treatment for the seller?

It depends on your entity type. In an asset sale, the price is allocated across categories that can be taxed differently, sometimes mixing ordinary income and capital gain. A stock sale is generally treated as the sale of an ownership interest, which may be more favorable. Buyers usually prefer asset deals for the basis step-up and liability protection; sellers often prefer stock deals. Have a CPA and attorney model both with your actual numbers before you commit to either structure.

Can I convert my S corp to a C corp to get QSBS before selling?

A conversion to C corp starts a new five-year clock for QSBS purposes. Converting shortly before a sale doesn't qualify you. If you're early enough in your ownership that a five-year hold is feasible before your target exit, a CPA and tax attorney can analyze whether conversion makes sense. There are also built-in gains tax considerations if you convert from S corp to C corp and then sell assets within a certain window afterward.

How far in advance should I start tax planning before selling?

Three or more years out gives you the full range of options. That's when structural changes with holding-period requirements, charitable trust setups, and full tax modeling are possible. Two years out, finalize the plan and complete any structural changes. One year out, your strategy should be locked and your transaction CPA already engaged before you see your first LOI. By the LOI stage, most of the large levers are already unavailable.

Do I need a different CPA for a business sale than my regular one?

Often yes. A transaction-experienced accountant models tax exposure under different deal structures, documents and defends add-backs for quality of earnings reviews, and flags issues before they become buyer leverage. Your regular CPA may be excellent at annual returns but may not have done many M&A transactions. Ask how many business sales they've worked through and whether they've dealt with quality of earnings reviews. If the answer is few, bring in a transaction CPA alongside them for the deal.

Keep reading

Capital gains tax when selling a business: rates, recapture, state taxes, and how deal structure affects your actual number.
Asset sale vs. stock sale: the full breakdown of both structures, why buyers push for asset deals, and what that means for your taxes.
Exit planning guide: the full workstream for preparing your business, your finances, and yourself for a sale.
Business valuation calculator: get an indicative range for your business today so you can model the tax gap.
EBITDA multiples by industry: current valuation ranges by sector, which determines how big the gain you're planning around actually is.

Get your tax strategy right before you sell

The planning has to start before the deal does.

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Reviewed by Tania Kozar

Director of Partnerships, ProCloser.ai

Tania leads ProCloser's network of vetted M&A advisory firms and works with business owners every week on valuation, deal structure, and getting matched to the right advisor to sell. This article is general information, not tax or legal advice. Engage a qualified CPA and transaction attorney before making decisions. Get matched free.

ProCloser.ai is not a registered investment adviser, broker-dealer, or financial planner, and nothing on this page is tax, legal, accounting, or financial advice. Tax outcomes depend on entity type, holding periods, deal structure, state law, and current federal law, all of which change. Engage a qualified CPA, transaction attorney, and estate planner before making any decisions about the sale of your business. ProCloser provides a professional services referral and matching service only. Rankings are editorially determined under the ProCloser TrustRank methodology; positions are never sold. See our Advertiser Disclosure.