Quick answer: Tax planning before a sale starts with questions for the owner’s CPA and attorney: the entity type and what it allows, how an asset sale and a stock sale compare after tax, the owner’s basis, state tax, whether payments can be spread over time, and when a change must be made to matter. The IRS describes long-term capital gain rates of 0%, 15% and 20%, and a 3.8% net investment income tax that may apply.[1][2]
Key points
- Tax outcomes in a sale depend on the entity, the structure, the owner’s basis and the allocation of price, so each is a question to settle with the CPA and attorney before the letter of intent.
- Compare offers on after-tax proceeds, not headline price, because structure moves tax between buyer and seller.
- Entity or ownership changes made shortly before launch can cost money or draw questions from buyers, so timing is a question to settle first.
- Federal and state layers differ, and the net investment income tax may or may not reach a given gain, so each needs the CPA’s confirmation.
Who answers the tax questions, and what to bring
Tax planning before a sale is a set of questions that the owner’s CPA and attorney answer with the numbers in front of them. The owner’s job is to ask early enough that the answers can still change something. An M&A advisor adds the structures buyers are likely to propose, and the guide to how CPAs support clients through a sale shows where the CPA fits among the stages.
Bring the documents that fix the facts: formation and ownership documents, recent tax returns, depreciation schedules, records of what the owner paid in, and a list of anything the owner holds personally that the business uses, such as real estate.
The questions, and why each one matters
Eight questions cover most of what an owner needs to settle before launch.
| Question | Why it matters | Bring to the CPA |
|---|---|---|
| What is the entity’s tax classification, and what does it allow in a sale? | It decides how many layers a sale can create and which structures are workable | Entity documents, election filings, recent returns |
| Which structure would the owner prefer after tax, and what will a buyer ask for? | Asset and stock sales shift tax between the parties, so structure is part of price | A draft model of each structure |
| What is the owner’s basis in the shares or interest, and in each asset? | The gain is the amount received less basis, and depreciation lowers basis | Contribution records, depreciation schedules |
| How might the buyer allocate the price, and what does each shift cost? | The allocation decides which kind of gain each dollar becomes | Fixed asset register, inventory and receivables detail |
| Which states tax the gain? | The owner’s home state and the states where the business operates can both be involved | Where the owner lives, and where the company has people, property and sales |
| Could part of the price be paid over time, and does that help? | Payments after closing can change when gain is reported and add credit risk | Draft terms for a seller note or earnout |
| Does the net investment income tax reach this gain? | It is a separate federal layer, and its reach depends on the owner’s facts | The owner’s role in the business, filing status and other income |
| Which changes need lead time, and what would they cost? | Changes made shortly before launch can be costly or questioned | A list of changes under consideration |
The questions are linked: the entity limits the structure, the structure drives the allocation, and the allocation and state facts produce the after-tax figure on which offers should be compared.
Entity type decides how many layers the sale has
An entity’s tax classification decides whether the gain is taxed at the company level, the owner level or both. A C corporation can face a second layer of tax in an asset sale, because the corporation is taxed on its gain and the owner is taxed again when the proceeds reach the owner. Pass-through entities, such as S corporations and LLCs taxed as partnerships, generally report the gain on the owners’ returns, which narrows the gap between an asset sale and a stock sale. The comparison of asset and stock sales explains the structures themselves. The question here is which of them the entity makes costly.
Illustrative example: What entity type does to the price an owner needs
A C corporation owner is offered $10,000,000 in a stock sale or in an asset sale. The corporation’s tax basis in its assets is $2,000,000 and the owner’s basis in the stock is $1,000,000. With a placeholder rate of 20 percent at the corporate level and 20 percent on the owner’s gain, and ignoring state tax, the net investment income tax and the cost of winding up the company, the owner keeps the following. The rates are placeholders, not the rates anyone will pay.
| Step | Stock sale at $10,000,000 | Asset sale at $10,000,000 | Asset sale at $12,000,000 |
|---|---|---|---|
| Corporate gain | None | $8,000,000 | $10,000,000 |
| Corporate tax | None | $1,600,000 | $2,000,000 |
| Cash reaching the owner | $10,000,000 | $8,400,000 | $10,000,000 |
| Owner’s gain after $1,000,000 basis | $9,000,000 | $7,400,000 | $9,000,000 |
| Owner’s tax | $1,800,000 | $1,480,000 | $1,800,000 |
| Kept by the owner | $8,200,000 | $6,920,000 | $8,200,000 |
The same headline price leaves the owner $1,280,000 less in the asset sale. Closing the gap takes a $2,000,000 higher price, because each extra dollar of price is taxed at both levels and the owner keeps only 64 cents of it. The amounts and rates are invented to show the mechanics and are not benchmarks, and a pass-through entity generally faces a narrower gap.
If the company is a C corporation, ask whether a change of tax status would help and whether gain built up before the change would stay exposed to corporate-level tax. The answer turns on rules and periods that only the CPA can confirm. Assets the owner holds outside the operating company, such as real estate, are sold or leased separately, and the rent affects reported earnings, as the guides to selling a business that owns its real estate and related-party rent adjustments explain.
Federal rates, the net investment income tax and state tax
The IRS describes gain on property held longer than one year as long-term and lists long-term capital gain rates of 0%, 15% and 20%, depending on taxable income. It also lists a separate maximum rate of 25% for unrecaptured section 1250 gain and of 28% for taxable gain from qualified small business stock.[1] Ask the CPA whether any stock could qualify as qualified small business stock, since eligibility depends on facts that only a review of the records can settle. Which of these rates reaches which part of a sale depends on the structure and the allocation, and the guide to federal taxes on a business sale shows how the layers stack.
The IRS describes the net investment income tax as 3.8% and says it applies to individuals whose income is above thresholds that depend on filing status. It also says net investment income generally includes capital gains.[2] The page does not address business sales, so whether the tax reaches a particular gain is a question for the CPA.
State income tax is a separate layer, and each state sets its own rules. The owner’s home state and the states where the business operates can both be involved. Owners in North Carolina can start with the guide to North Carolina taxes on a business sale.
Installments and timing
Part of the price may be paid after closing, through a seller note or an earnout. The IRS provides Form 6252 for reporting income from an installment sale under the installment method.[3] Spreading payments can change the year in which gain is reported, but it also makes the owner a lender to the buyer, who bears the risk that later payments are not made. The installment sale guide explains the mechanism, and the CPA should model both the tax timing and the credit risk.
Ask the CPA which changes need lead time. Owners consider converting the entity, moving real estate into or out of the operating company, changing how they are paid, buying out a minority holder and transferring shares to family or trusts. Each can alter the tax result of a sale, and each can cost money or draw questions from a buyer if done shortly before launch. The advisors should say which are worth making and how much time each needs, and the launch date should follow their answer. The guide to how far ahead to prepare builds the timeline backward from launch.
A working sequence
- Before any buyer is contacted. Meet the CPA and attorney with the documents above and agree the questions in the table.
- Before launch. Decide which changes to make and give each the lead time the advisors specify. Settle the owner’s structure preference and what it would take to depart from it.
- During marketing. Update the models as offers arrive, and compare each offer after tax and not on headline price.
- At the letter of intent. Confirm the structure and ask that the principles for allocating the price appear in it, because they are hard to move afterward. The guide to purchase price allocation covers the asset classes.
- Before signing. Refresh the model with the final terms and confirm the filing steps with the CPA.
This work is one stage of the roadmap for preparing a business for sale, and this guide is general education and not tax advice.
Frequently asked questions
When should an owner start tax planning for a business sale?
Before any buyer is approached, and ideally well before launch. Some choices, such as an entity change, need lead time and can carry costs, and the CPA confirms which. Once a letter of intent is signed, little beyond structure and allocation is left to negotiate.
Does entity type affect taxes when selling a business?
Yes. Whether the gain is taxed once or at two levels, and which structures a buyer can use, depend on how the entity is classified. A C corporation can face a second layer of tax in an asset sale, while pass-through entities generally report the gain on the owners’ returns. The CPA should model the entity’s actual position.
What are the federal capital gain rates for a business sale?
The IRS describes long-term capital gain rates of 0%, 15% and 20%, depending on taxable income, for property held longer than one year.[1] Which rate reaches which part of a sale depends on structure and allocation, and some parts may be taxed as ordinary income, so the CPA has to classify each piece of the gain.
Does the net investment income tax apply when selling a business?
Possibly. The IRS describes a 3.8% tax on net investment income for individuals above income thresholds that vary by filing status.[2] Its page does not discuss business sales, so whether a given gain is reached is a question for the owner’s CPA, who will ask about the owner’s role in the business and the entity’s classification.
Can the tax on a business sale be spread over several years?
Sometimes, when part of the price is paid after closing. The IRS provides Form 6252 to report income from an installment sale using the installment method.[3] Spreading payments also makes the seller a lender to the buyer, so the CPA and attorney should weigh the credit risk against the timing benefit.
Preparing a company for sale or a buyer's diligence?
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Related guides
- Asset Sale vs. Stock Sale: How Structure Changes Your Proceeds: In an asset sale the buyer picks the assets and liabilities it takes. In a stock sale it buys the owner’s shares. See how each affects taxes, risk and proceeds.
- How CPAs Support Clients Through the Sale of a Business: Where the CPA fits when a client sells a company: readiness, normalized financials, tax structure, diligence support, the working capital true-up and proceeds.
- Federal Taxes When You Sell a Business: Capital Gain, Ordinary Income and Recapture: Federal tax on a business sale comes in layers: capital gain, depreciation recapture, ordinary income and the net investment income tax. See how they stack.
- Installment Sale of a Business: How Seller Financing Defers Tax and Adds Risk: The installment method reports gain as a seller note is paid. See how deferral works, which parts of a sale qualify and the default risk the seller takes on.
- North Carolina Taxes on the Sale of a Business: What Owners Should Ask Their CPA: North Carolina’s published flat income tax rate, how state tax layers on federal tax in a business sale, and the entity, residency and payment questions for a CPA.
- How to Prepare a Business for Sale: A Roadmap From Readiness to Launch: How to prepare a business for sale in six stages: assess readiness, clean up the numbers, document, reduce risk, package and launch, with a guide for each.
Sources
- Topic no. 409, Capital gains and losses. Internal Revenue Service. Accessed October 13, 2026.
- Net Investment Income Tax. Internal Revenue Service. Accessed October 13, 2026.
- About Form 6252, Installment Sale Income. Internal Revenue Service. Accessed October 13, 2026.
This guide is general education. It is not a valuation opinion, appraisal, investment advice, or legal or tax advice. How these guides are made.