Charitable gifts around a business sale run on one clock: the deal's. An owner who donates an interest in the company while the sale is still genuinely uncertain can generally avoid capital gains tax on the donated portion and, for gifts to public charities, deduct the appraised fair market value. Once a binding agreement makes the sale a practical certainty, the IRS can tax the donor on the gain anyway under the anticipatory assignment-of-income doctrine, and a defective appraisal can erase the deduction on top of that.
This article is educational only. It is not tax, legal, or investment advice, and nothing here is a recommendation to adopt any strategy. Charitable planning around a sale is intensely fact-specific. Owners should work with their own CPA, tax attorney, and wealth advisor before moving a single share.
The Basic Choice: Give the Asset Before, or Give Cash After
Two patterns cover most sale-year giving. In the first, the owner transfers part of the business itself (stock, LLC units, or a partnership interest) to a charity before the deal becomes binding. The charity then sells its slice alongside the owner at closing. Because a public charity generally pays no tax on the sale, the gain on the donated portion is typically never taxed to anyone, and the owner claims a deduction based on appraised fair market value.
In the second pattern, the owner sells the whole company, pays capital gains tax on the full gain, and donates cash afterward. It is simpler and carries almost no execution risk, but the tax on the donated dollars has already been paid.
A rough illustration: an owner with $1 million of basis expects a $20 million sale. Donating a 5 percent interest well before signing moves roughly $1 million of value (before any valuation discounts an appraiser may apply to a minority interest) to charity without the owner recognizing gain on that slice. Selling first and writing a $1 million check means the owner recognizes gain on the entire $19 million spread, then deducts the cash gift. The pre-sale gift usually produces the larger combined benefit, which is exactly why the IRS polices its timing so closely.
| Feature | Interest donated before a binding deal | Cash donated after closing |
|---|---|---|
| Capital gain on the donated value | Generally not taxed to the donor, if the gift clears the assignment-of-income line | Fully taxed to the owner before the gift |
| Deduction measured by | Appraised fair market value (gifts to public charities) | Amount of cash given |
| AGI limit at a public charity | Generally 30% of AGI for long-term appreciated property | Up to 60% of AGI (permanent as of 2026) |
| Substantiation | Form 8283 Section B plus a qualified appraisal above $5,000 | Receipts and a written acknowledgment |
| Timing risk | High; a gift made when the sale is a practical certainty fails | None; the deal is done |
| Moving parts | Transfer restrictions, charity acceptance, entity-type issues, appraisal | A wire transfer |
The Assignment-of-Income Doctrine: The Timing Constraint That Decides Everything
The anticipatory assignment-of-income doctrine is a rule courts have applied since the 1930s: income is taxed to the person who earns it or holds a fixed right to receive it, and that right cannot be given away at the last minute. Applied to a sale, if the owner already has a fixed right to the proceeds when the gift is made, the IRS treats the owner as having sold the shares and donated cash, taxing the gain to the owner even though the charity received the stock.
A 2023 Tax Court memorandum decision shows how this plays out. A shareholder in a closely held company contributed stock to a donor-advised fund sponsor two days before closing. By then a definitive purchase agreement existed, no meaningful contingencies remained, the company's excess working capital had already been distributed to the owners, and the remaining steps were ministerial. The court concluded the transaction was too far along, and the donor was taxed on the gain attributable to the donated shares.
Where the Line Sits
There is no bright-line number of days. The question is whether, looking at the reality and substance of all the circumstances, the seller had a fixed right to the income at the moment of transfer. Practitioner commentary on the 2023 case draws two working conclusions. First, waiting until a purchase agreement is signed, or nearly final, sharply raises the risk. Second, the gift needs to happen while a genuine possibility remains that the deal will change or die, which means the charity truly bears deal risk on its shares. Gifts made at the letter-of-intent stage, while diligence is open and terms are still moving, have historically stood on firmer ground than gifts made in the final days before closing, though every set of facts is judged on its own.
Three Common Vehicles, Described Conceptually
Donor-Advised Funds
The IRS describes a donor-advised fund as a separately identified fund or account maintained and operated by a section 501(c)(3) sponsoring organization. Once assets go in, the sponsoring organization has legal control; the donor retains advisory privileges over how the account is invested and granted out. Because sponsors are public charities, the public-charity deduction rules generally apply to contributions. Sponsors decide case by case whether to accept closely held interests, and they control the eventual sale of donated shares. The IRS has also warned about abusive donor-advised fund arrangements that generate questionable deductions or impermissible benefits to donors, so sponsor diligence matters.
Private Foundations
A private nonoperating foundation offers the most donor control and a permanent family vehicle, but the deduction math differs in two ways that matter for a business sale. Under IRS Publication 526, the deduction for capital gain property contributed to a private nonoperating foundation is limited to the donor's basis in the property, and such gifts face a 20 percent of AGI ceiling rather than 30 percent. For low-basis closely held stock, a basis-limited deduction can be a small fraction of the value given. Foundations also carry their own ongoing compliance regime, including annual filings and rules restricting transactions with insiders.
Charitable Remainder Trusts
A charitable remainder trust is an irrevocable trust that pays one or more beneficiaries for life or for a term of up to 20 years, with the remainder passing to charity. IRS rules require the charitable remainder to be worth at least 10 percent of the initial fair market value of the assets contributed. An annuity trust pays a fixed dollar amount, and a unitrust pays a fixed percentage of the trust's annually revalued assets; in each case the payout rate is set between 5 and 50 percent. The donor's deduction equals the present value of the remainder interest, and the trust structure can defer income taxes on the sale of assets transferred to it, with distributions to beneficiaries taxed under a tier system (ordinary income first, then capital gains, then other income, then principal). The trust files Form 5227 each year. Funding a remainder trust with pre-sale stock is subject to the same assignment-of-income clock as any other pre-sale gift.
Appraisal Requirements: Where Deductions Die
Noncash gifts carry substantiation rules that are unforgiving. As of 2026, the IRS requires Form 8283 for any noncash contribution deduction above $500. When the claimed deduction exceeds $5,000 per item or group of similar items, the donor must obtain a qualified appraisal and complete Form 8283 Section B. When the claimed deduction exceeds $500,000, the appraisal itself must be attached to the return.
The appraisal must be signed and dated by a qualified appraiser no earlier than 60 days before the contribution date, and the donor must receive it by the due date of the return, including extensions. A qualified appraiser generally must hold a recognized professional appraisal designation, or have at least two years of experience valuing that type of property plus relevant education, and must regularly be paid for appraisal work.
The stakes are not theoretical. In the same 2023 Tax Court case described above, the donor's charitable deduction of roughly $3.3 million was disallowed in full because the appraisal came from the donor's financial adviser, who lacked appraisal credentials, and the report itself had defects, including a wrong contribution date and missing required statements. The court declined to excuse the errors as substantial compliance. The donor was taxed on the gain and lost the deduction in a single case.
Deduction Limits as of 2026
Federal law changed for tax years beginning in 2026, so the current numbers are worth stating plainly:
- Cash gifts to public charities are deductible up to 60 percent of AGI, a limit made permanent by 2025 legislation.
- Long-term appreciated property given to public charities, including donor-advised fund sponsors, is generally limited to 30 percent of AGI.
- Capital gain property given to private nonoperating foundations is limited to 20 percent of AGI and is generally deductible only at basis.
- Beginning in 2026, itemizers may deduct charitable gifts only to the extent they exceed 0.5 percent of AGI, and taxpayers in the top bracket receive at most 35 cents of benefit per deducted dollar.
- Contributions above the applicable ceiling can generally be carried forward for up to five tax years.
These interactions are one reason sale-year gifts are modeled, not guessed. A large gift in a very high-income year can absorb the new floor efficiently, or collide with the percentage ceilings, depending entirely on the numbers.
Where the Advisor Team Fits
Pre-sale charitable gifts fail on execution details far more often than on concept. The owner's CPA models AGI capacity, the 0.5 percent floor, carryforwards, and entity questions such as the special issues raised when S corporation stock or a debt-carrying partnership interest is donated. Deal counsel and a tax attorney confirm that transfer restrictions, shareholder agreements, and buyer consent requirements permit the gift, and that the gift documents are dated and delivered before the deal crosses the certainty line. A credentialed independent appraiser needs to be engaged early enough to satisfy the 60-day window. A wealth advisor helps the owner compare vehicles against family goals. Each of these professionals sees a different failure mode, and the 2023 case managed to hit two of them at once.
Sources
- IRS: Charitable Remainder Trusts
- IRS: Donor-Advised Funds
- IRS: Instructions for Form 8283, Noncash Charitable Contributions
- IRS: Publication 526, Charitable Contributions
- McGuireWoods: Timing Is Critical for Gift of Appreciated Stock to Avoid Capital Gain From Sale of Company
- DAFgiving360: What the One Big Beautiful Bill Act Means for Charitable Giving
Frequently asked questions
- Can I donate shares of my business to charity before selling it?
- Often yes, if the company's governing documents permit the transfer and the charity agrees to accept a closely held interest. Timing is the real constraint: when the sale is already a practical certainty at the moment of the gift, the IRS can tax the donor on the gain under the assignment-of-income doctrine. Gifts made while genuine deal risk remains have fared far better. This is educational information, not advice.
- What is the anticipatory assignment of income doctrine?
- It is the long-standing principle that income is taxed to the person who earned it or holds a fixed right to receive it, even if the underlying asset is given away first. In a 2023 Tax Court case, stock donated to a donor-advised fund two days before closing, after a definitive purchase agreement was signed, left the donor taxable on the gain despite a completed gift.
- Do I need a qualified appraisal to donate private company stock?
- Generally yes for claimed deductions above $5,000: IRS rules require a qualified appraisal plus Form 8283 Section B, and deductions above $500,000 require attaching the appraisal to the return. The appraisal must be signed no earlier than 60 days before the gift and received by the return's extended due date. Courts have disallowed multimillion-dollar deductions over defective appraisals, so credentials and content both matter.
- Is a donor-advised fund or a private foundation better for a gift before a business sale?
- Neither is better in the abstract; the tax mechanics simply differ. Gifts of long-term appreciated interests to a donor-advised fund sponsor, a public charity, are generally deductible at appraised fair market value up to 30 percent of AGI. Gifts of the same property to a private nonoperating foundation are generally deductible only at basis, capped at 20 percent of AGI, with more control and more administration. Owners should model both with their advisors.
- How much of my income can I deduct for charitable gifts in the year I sell my business?
- As of 2026, cash gifts to public charities are deductible up to 60 percent of AGI, and long-term appreciated property to public charities is generally capped at 30 percent, with lower limits for private nonoperating foundations. Itemizers must exceed a new 0.5 percent-of-AGI floor, top-bracket benefit is capped at 35 cents per dollar, and unused amounts generally carry forward up to five years.
Considering a sale in the next few years? See what a prepared process looks like.
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