Tax
Tax Affecting: Why Your S Corp Valuation Subtracts a Tax the Company Never Pays
Your S corp owes no entity-level income tax. The Tax Court still let an appraiser cut 26.2% from its earnings. When tax affecting holds up, and when it fails.
By 409.AI Team - 2026-09-24
# Tax Affecting: Why Your S Corp Valuation Subtracts a Tax the Company Never Pays
The first time an owner of an S corporation reads a valuation report closely, one line usually stops them. Somewhere in the income approach, the appraiser has taken the company's projected earnings and reduced them by income tax. The company has never filed a corporate return. It has never written the IRS a check for entity-level income tax, because Subchapter S pushes that tax onto the owners' personal returns instead, a few narrow exceptions like the built-in gains tax aside. So why is a tax that doesn't exist pulling roughly a quarter out of the value?
That question has been argued in front of judges since 1999, and the answer in 2026 is not a rule you can look up. It's an evidentiary question, and the Tax Court has now answered it both ways depending on what the appraiser put in the report. The practice is called tax affecting, and if you own an S corp or an LLC and you're about to gift shares, trigger a buy-sell, or borrow against the business, it's the single assumption most likely to move your number.
The mismatch that started the fight
An S corporation is a domestic entity that has elected under [Section 1362](https://www.law.cornell.edu/uscode/text/26/1362) to be taxed under Subchapter S. Its income, deductions, and credits flow through to the shareholders under [Section 1366](https://www.law.cornell.edu/uscode/text/26/1366), who pay tax at their own rates. Plenty of LLCs make the same election, so this isn't only a corporate-form question.
Now look at how an appraiser builds a discount rate. The cost of capital comes from observed returns on publicly traded companies, and public companies are taxable C corporations. A 2014 IRS job aid written for the agency's own valuation analysts makes the point plainly: rate-of-return data gathered from publicly traded taxable corporations "reflects entity-level tax in the calculation of the reported rates-of-return." Those returns are what's left after the corporate tax has already been paid.
Put a pre-tax earnings stream on top of an after-tax discount rate and the arithmetic quietly inflates the answer. That's the mismatch, and the numbers are not subtle.
Take a company throwing off $2 million of pre-tax earnings, capitalized at 12%. Leave the earnings untaxed and you get roughly $16.7 million. Apply a 26.2% hypothetical entity-level tax first, and $1.48 million capitalized at the same 12% gives about $12.3 million. Same company, same day, same [income approach](https://409.ai/articles/income-approach-409a-valuation). A $4.4 million spread, driven entirely by one assumption about a tax the entity will never pay. A [market approach](https://409.ai/articles/market-approach-409a-valuation) built on C corporation multiples carries the same problem in a different wrapper.
Where the IRS planted its flag
The modern dispute starts with Gross v. Commissioner, T.C. Memo. 1999-254, affirmed at 272 F.3d 333 (6th Cir. 2001), where the Tax Court refused to apply hypothetical corporate tax to an S corporation's earnings. Appraisers had been tax affecting as a matter of habit. After Gross, the IRS had a case to point at, and it pointed at it for two decades.
In October 2014 the agency went further and published the job aid quoted above, [Valuation of Non-Controlling Interests in Business Entities Electing to be Treated as S Corporations](https://www.irs.gov/pub/irs-lbi/S%20Corporation%20Valuation%20Job%20Aid%20for%20IRS%20Valuation%20Professionals.pdf). Its conclusion is worth reading in the original: "absent a compelling showing that unrelated parties dealing at arms-length would reduce the projected cash flows by a hypothetical entity level tax, no entity level tax should be applied in determining the cash flows of an electing S Corporation."
Read that sentence again and notice what it isn't. It isn't a prohibition. It's a default with an exception built into the first five words, and the exception is evidence about what real buyers and sellers would do. The same document also tells IRS analysts that "pass-through entities should be, where at all possible, compared to other pass-through entities in the valuation process," which is a fix for the mismatch rather than a denial that the mismatch exists. It also carries a disclaimer on every page: the job aid "is not Official IRS position and was prepared for reference purposes only." It sits with the agency's other appraiser material on the IRS [valuation of assets](https://www.irs.gov/businesses/valuation-of-assets) page.
Then the courts started saying yes
Four cases moved the ground.
In Kress v. United States, 372 F. Supp. 3d 731 (E.D. Wis. 2019), a family had gifted minority stock in Green Bay Packaging to children and grandchildren and sued for a gift tax refund. All three valuation experts, including the government's own, tax affected the company's earnings at a C corporation rate. The government's expert then added an S corporation premium on top. The court took the tax affecting and threw out the premium. When the IRS's own witness uses the method, arguing against it gets harder.
Estate of Jones v. Commissioner, T.C. Memo. 2019-101, came the same year, and the Tax Court accepted tax affecting there too.
Then Estate of Jackson v. Commissioner, T.C. Memo. 2021-48, the Michael Jackson estate case, went the other way. The court rejected tax affecting because the estate had not shown that a C corporation would be the hypothetical buyer of the contested assets. The method didn't fail. The justification did.
Estate of Cecil v. Commissioner, T.C. Memo. 2023-24, involved gifts of noncontrolling, nonmarketable shares in The Biltmore Company, with a $13,022,552 gift tax deficiency at stake. The court allowed tax affecting and then added a warning that every appraiser should have taped to their monitor: it was "not necessarily holding that tax affecting is always, or even more often than not, a proper consideration for valuing an S corporation."
Pierce, and the 26.2% that stuck
The most useful case for owners is the most recent. In Pierce v. Commissioner, T.C. Memo. 2025-29, decided in April 2025, two owners of Mothers Lounge, LLC, a baby products business taxed as an S corporation, each gifted a 29.4% interest to an irrevocable trust in June 2014 and sold a 20.6% interest for promissory notes. The IRS came back with a deficiency of roughly $4.8 million plus a penalty of about $1.9 million.
Both sides agreed a discounted cash flow was the right method, and the court built its own answer out of pieces from each expert. It took the taxpayer's projections and a 3% long-term growth rate. It took the government's 18% base cost of equity. It threw out the taxpayer's 5% company-specific risk adjustment as unexplained and unquantified. It allowed a 5% discount for lack of control and a 25% discount for lack of marketability.
And on the pass-through question, it accepted tax affecting using the Delaware Chancery method at a hypothetical entity-level rate of 26.2%, reasoning that the adjustment can be necessary when the valuation data comes from C corporations, to correct what it described as the mismatch between pre-tax cash flows and after-tax discount rates. The opinion repeated the Cecil caution almost word for word.
So the pattern across six cases is consistent, even though the outcomes differ. Tax affecting survives when the appraiser ties it to the data actually used in the report. It dies when it rests on a story about a hypothetical C corporation buyer that nobody can support.
What the Delaware Chancery method actually does
The name comes from Delaware Open MRI Radiology Associates v. Kessler, 898 A.2d 290 (Del. Ch. 2006), a squeeze-out merger among radiologists. One expert treated the company as a C corporation at 40%. The other ignored taxes entirely. The court refused both, on the view that "what is important to an investor is what the investor ultimately can keep in his pocket," and built a middle answer: an equivalent pre-dividend S corporation rate of 29.4%, lower than a full corporate rate because S corporation owners escape the second layer of tax on dividends, higher than zero because they still pay personal tax on what flows through.
That's the point people miss. The Delaware approach is not a back door to C corporation treatment. It preserves most of the pass-through benefit and prices the rest. Pierce's 26.2% belongs to that family of math, not to the 21% federal corporate rate.
The discount does not always run in your favor
Owners tend to hear "lower value" and assume it's good news. Whether it is depends on which side of the transaction you're standing on.
For a gift to a trust or a transfer at death, a lower defensible value is usually the goal, which is why tax affecting shows up in gift tax cases far more than anywhere else, and why it matters when you're [gifting equity against the current exemption](https://409.ai/articles/gifting-startup-equity-2026-estate-tax-exemption). For a departing partner bought out under a shareholders' agreement, a bank sizing a loan, or a spouse in a divorce, that same reduction is money leaving your side of the table. [Buy-sell agreements](https://409.ai/articles/buy-sell-agreement-valuation-connelly-life-insurance) are where this bites hardest, because the number is not a negotiating position, it's a contract term.
What you cannot do is switch positions by engagement. Tax affect the gift, refuse to tax affect the buyout two years later, and you've handed the other side a document that contradicts your own appraiser. Reports get subpoenaed and compared.
Three questions worth asking before you sign
Ask your appraiser where the discount rate came from, and whether the underlying return data is after entity-level tax. If it is, the report owes you an explanation of how it handled the mismatch.
Ask what rate was applied and why, in terms of what a buyer and seller would actually negotiate. "Everyone does it" is the reasoning that lost in Jackson. The mechanics of the Delaware method, or a pass-through peer set, is the reasoning that won in Pierce.
Ask whether the guideline companies are pass-throughs or C corporations, because the IRS's own job aid says to compare pass-throughs to pass-throughs where possible. If the comparables are all taxable corporations, tax affecting is fixing a problem the appraiser created two chapters earlier.
If you run a C corporation, this isn't your fight yet
A Delaware C corporation getting a [409A valuation](https://409.ai/products/409a) has no pass-through question to argue. The tax is real and it's already in the model. But the issue arrives the moment the entity is an LLC, and it shapes the hurdle on [profits interests](https://409.ai/articles/profits-interests-llc-equity-hurdle-valuation) the same way it shapes a gift. It also matters on conversion day, when an [LLC becomes a C corporation](https://409.ai/articles/llc-to-c-corp-conversion-qsbs-valuation-section-1202) and the valuation crossing that line has to be internally consistent about which tax regime it's pricing.
Note too that tax affecting is a separate adjustment from the [discount for lack of marketability](https://409.ai/articles/discount-lack-marketability-dlom-409a-valuation), and the two stack. In Pierce, 26.2% came off the cash flows before 5% and 25% came off the equity value. Order of operations is not a footnote when the result is a gift tax return.
The takeaway
Tax affecting is not a checkbox and it has never been settled by a rule. More than twenty-five years after Gross, what decides it is a paragraph of reasoning in your appraisal, and whether that paragraph connects the tax adjustment to the data the report actually used.
Before you sign a Form 709 or a buy-sell valuation for an S corp or an LLC, find that paragraph. If it says a hypothetical buyer would be a C corporation and stops there, you're holding the version of the argument that lost. If it explains the mismatch between a pre-tax earnings stream and an after-tax discount rate, and prices it the way Delaware did, you're holding the version that has now won three times in the Tax Court. Getting that reasoning on paper is the job an expert-reviewed [SMB valuation](https://409.ai/products/smb-valuation) or [gift and estate tax valuation](https://409.ai/products/gift-estate-tax) is supposed to do. The tax line is not where an appraiser saves you money. It's where the report either holds up under examination or doesn't.