Valuation Discounts Under Scrutiny: A Deep Dive Into Estate Planning Risk

A family sits down with an estate attorney, forms an LLC, drops in a rental portfolio or a brokerage account, and then transfers minority slices of that LLC to a trust at a price well below the pro-rata share of the underlying assets. On paper, that’s the whole trick behind valuation discounting for estate planning. In practice, it’s one of the most contested corners of gift and estate tax law, and the last several years have made that friction sharper rather than softer.

Why Valuation Discounts Are Under Renewed Pressure Right Now

Interest rates that stayed elevated through much of the mid-2020s pushed families back toward two tools that thrive in a higher-rate environment for one leg and a low-rate environment for the other: intentionally defective grantor trust (IDGT) installment sales, which work well regardless of rate direction, and grantor retained annuity trusts (GRATs), which perform best when the underlying asset outgrows the IRS Section 7520 hurdle rate. Both techniques get a boost when the asset moved into the trust is valued as low as legally defensible at the moment of transfer, because every dollar shaved off today’s value is a dollar that isn’t taxed later when it appreciates outside the estate.

Family limited partnerships and family LLCs have been the vehicle of choice for that valuation compression for three decades, because breaking a $10 million portfolio into a general partner interest and a set of minority limited interests creates real, defensible arguments for lack-of-control and lack-of-marketability discounts. These entities are usually just one piece of a broader plan; families layering discounted transfers on top of a trust structure often coordinate the timing with the rest of their estate planning for generational wealth transfer strategy, since the entity, the trust, and the family’s overall documents need to move together rather than as disconnected pieces. A 20% limited interest in an LLC can’t force a distribution, can’t compel a sale of the underlying property, and can’t be sold to a stranger without restriction, so appraisers argue it’s worth less per dollar of underlying net asset value than a pro-rata slice would suggest.

The pressure point is that the IRS has spent two decades watching this technique get pushed further than the courts are comfortable with, and estate examiners now routinely flag any FLP or LLC funded shortly before a death, gift, or trust sale, especially when the entity holds marketable securities rather than an operating business. Add a wave of Tax Court decisions trimming claimed discounts, the long shadow of the 2016 proposed Section 2704 regulations, and a larger IRS estate and gift tax enforcement budget under recent funding cycles, and you have a planning technique that still works — but only when it’s built correctly and documented as if an examiner will read every page.

What Lack-of-Control and Lack-of-Marketability Discounts Actually Measure

Both discounts answer the same underlying question from different angles: what would a hypothetical willing buyer actually pay for this specific slice of ownership, given its real-world limitations, rather than what the buyer would pay for a proportional slice of the entity’s total value.

The Discount for Lack of Control (DLOC)

A discount for lack of control, sometimes called a minority interest discount, reflects the fact that a non-controlling owner cannot direct the entity’s operations, compel distributions, force a liquidation, amend the governing agreement, or approve a sale of underlying assets. If a family LLC holds a $10 million apartment building, the general partner or managing member decides when it refinances, when it sells, and when — or whether — cash gets distributed to the limited interest holders. A buyer stepping into that limited interest is buying a claim on future value with no say in the timing or the terms, and appraisers price that powerlessness as a reduction from the interest’s pro-rata net asset value.

The Discount for Lack of Marketability (DLOM)

A discount for lack of marketability reflects the simple fact that there is no public market for a slice of a private family entity. There’s no ticker, no daily quote, and usually a right-of-first-refusal clause or outright transfer restriction in the operating agreement that keeps the interest from being sold to anyone outside the family without consent. A buyer of that interest is locking up capital indefinitely, with no clear exit, and demands a lower price to compensate for that illiquidity — the same logic that makes restricted stock trade below its freely tradable counterpart.

When both discounts apply to the same interest — which is the normal case for a minority stake in a closely held family LLC — appraisers typically apply them sequentially rather than adding the percentages together, because DLOM is applied to the value that already reflects the lack of control. That sequencing matters more than it looks; stacking a 15% and a 25% discount by simple addition would imply a 40% reduction, while applying them in sequence produces a smaller combined effect, as the worked example below shows.

How Appraisers Actually Calculate These Discounts

Nobody pulls a discount percentage out of the air, or at least nobody should. Defensible appraisals build the number from data, and IRS examiners know exactly which shortcuts to look for.

Restricted stock and pre-IPO studies for DLOM

The most common empirical basis for a marketability discount comes from studies comparing the trading price of restricted shares of public companies against the freely tradable shares of the same company, and from studies comparing pre-IPO private transaction prices against the eventual public offering price. These datasets — going back to studies from the 1970s through more recent academic work — show average discounts clustering in a fairly wide band, and a competent appraiser adjusts within that band based on factors specific to the entity: how long the holding period is likely to be, whether the entity distributes cash regularly, whether there’s a realistic path to liquidity such as a buy-sell agreement, and how volatile or predictable the underlying assets are.

The Mandelbaum factors

Since the Tax Court’s decision in Mandelbaum v. Commissioner, appraisers and examiners alike have organized the marketability analysis around a now-standard list of factors: the entity’s financial statement strength, its dividend or distribution policy, the nature of the business and its historical earnings, the entity’s management, the amount of control the transferred block represents, any restrictions on transferability in the governing documents, the holding period the buyer would realistically face, the entity’s redemption policy, and the costs associated with a public offering if one were ever contemplated. An appraisal report that walks through each factor with entity-specific facts is far more defensible than one that cites an industry-average discount and stops there.

Quantitative models for DLOC

Control discounts are frequently benchmarked against control premium data from completed mergers and acquisitions of similar companies — the inverse of a control premium is a rough proxy for a minority discount — as well as put-option and option-pricing models that price the cost of the lack of control as an implicit hedge the minority holder can’t buy. For entities holding passive investment assets like marketable securities or a single piece of real estate, appraisers also look at closed-end fund discounts to net asset value as a real-world benchmark, since publicly traded closed-end funds trade at a discount to their underlying holdings for reasons that echo the control and liquidity limitations of a family LLC interest.

Why the IRS Scrutinizes Aggressive Discounting So Closely

The IRS doesn’t dispute that discounts are theoretically legitimate — decades of case law say they are. What draws audit attention is a specific pattern of red flags that shows up again and again in litigated cases.

Circular valuation and last-minute funding

Examiners look hard at the sequence of events. If a family funds an LLC with a brokerage account on a Tuesday and gifts or sells minority interests to a trust the following week, the IRS will argue the entity had no independent business purpose and existed solely to manufacture a discount — a fact pattern courts have penalized under the step-transaction doctrine and under Section 2036, which can pull the full value of transferred assets back into the taxable estate if the transferor retained too much practical control or enjoyment of the underlying property. “Circular valuation” also describes appraisals that value the LLC interest by starting from the desired outcome and reverse-engineering a discount to hit it, rather than building the number from market data forward.

Weak or non-independent appraisals

A disproportionate share of discount disputes trace back to appraisal quality rather than the underlying legal theory. Reports prepared by an in-house accountant with no valuation credential, reports that recycle boilerplate discount percentages from a prior client’s report, or reports that skip a formal analysis of entity-specific facts all invite challenge. The IRS Engineering Program routinely refers large discount claims for a second appraisal, and when the agency’s appraiser and the taxpayer’s appraiser are 15 to 20 percentage points apart, litigation often follows.

The Section 2704 proposed regulations and their aftermath

In August 2016, Treasury proposed regulations under Internal Revenue Code Section 2704 that would have sharply curtailed valuation discounts for transfers of interests in family-controlled entities, largely by disregarding certain lapsing rights and restrictions that don’t reflect genuine arm’s-length terms. The proposal triggered an unusually large volume of public comment, much of it warning that the rules would have swept in ordinary operating businesses and family farms, not just the passive-asset holding companies the rules were aimed at. Treasury withdrew the proposed regulations in October 2017 after a broader regulatory review, and no replacement has been finalized since. That withdrawal didn’t end IRS scrutiny — it just moved the fight from rulemaking back to case-by-case audit and litigation, where the agency has continued to challenge aggressive discounts using existing doctrines like Section 2036 and economic substance arguments instead of a bright-line rule.

What Recent Tax Court Cases Say About Discount Percentages

Litigated cases give planners the closest thing to real-world guardrails, because they show what a court actually accepted after both sides’ experts were cross-examined.

Courts have generally been willing to sustain combined discounts in a moderate range — often somewhere between the mid-20s and mid-30s as a percentage of net asset value — when the appraisal used recognized methodologies, the entity had a real economic rationale beyond tax savings, and the restrictions on transfer and control were consistent with the entity’s governing documents rather than invented for the appraisal. Cases have gone the other way, and dramatically so, when the entity was funded with cash or securities shortly before death or gift, when the transferor kept effective control over distributions in practice even without holding it on paper, or when the taxpayer’s expert used a discount percentage that wasn’t tied to any comparable data set. In several closely watched decisions, courts split the difference between the IRS position and the taxpayer’s claimed discount, landing on a blended figure that neither side had originally proposed — a pattern that should make planners treat any single discount percentage as a negotiating range rather than a guarantee.

The throughline across this case law is procedural as much as substantive: the taxpayers who kept the entity running for a genuine period before any transfer, respected the partnership or operating agreement in actual practice, and hired an appraiser with a documented, factor-by-factor analysis fared far better than those who treated the FLP or LLC as a paper formality wrapped around a pre-existing brokerage account.

A Worked Example: Sizing the Discount on an IDGT Sale

Numbers make the mechanics concrete. Assume a family LLC holds $10,000,000 of marketable securities and a small commercial property, contributed by the parents in exchange for a 2% general manager interest and a 98% limited interest. The parents then plan to sell a 20% limited interest to an existing intentionally defective grantor trust in exchange for a promissory note.

The trust buys that 20% interest for its appraised fair market value of $1,275,000, paying with a nine-year promissory note bearing interest at the applicable federal rate in effect for the month of the sale — call it 4.5% for illustration. Because the trust is a grantor trust for income tax purposes, the sale triggers no capital gain, and the note’s interest payments are not separately taxable income to the parents. To satisfy the seed-capital guidance that practitioners generally follow for IDGT sales, the trust should already hold unencumbered assets equal to roughly 10% of the purchase price — about $127,500 here — typically funded through a prior gift, before the sale closes.

From that point forward, the trust owns an asset appraised at $1,275,000 that represents a $2,000,000 pro-rata claim on the LLC’s underlying portfolio. If that portfolio grows at 7% annually, the value inside the trust — outside the taxable estate — grows on the full $2,000,000 economic base, not the discounted purchase price, while the parents’ estate is left holding only a promissory note earning 4.5%. The discount didn’t just reduce a gift or sale price on day one; it widened the gap between what left the estate and what the trust actually controls, which is the entire point of combining valuation discounts with an estate freeze technique.

Typical Discount Ranges by Entity and Interest Type

Discount size isn’t uniform — it moves with the type of underlying asset, the size of the block transferred, and how restrictive the entity’s governing documents actually are in practice, not just on paper.

Ranges reflect commonly cited outcomes across published appraisal literature and litigated valuation cases; they are illustrative benchmarks, not a guarantee of what any specific appraisal or audit will support.

Visualizing the Discount Stack

The chart below shows how the two discounts compress the value of a hypothetical $2,000,000 pro-rata interest step by step, using the same figures as the worked example above.

Common Mistakes That Trigger IRS Challenges

Most discount disputes trace back to a small set of recurring errors, and nearly all of them are avoidable with enough lead time and a properly briefed appraiser.

• Funding the entity and transferring interests too close together. When an LLC is formed and funded within weeks of a gift or IDGT sale, the IRS treats the entire sequence as a single transaction designed to manufacture a discount, and courts have applied the step-transaction doctrine to collapse the steps and disregard the discount entirely.
• Retaining informal control over distributions. If the transferor keeps writing checks from the LLC’s account for personal expenses after the transfer, or keeps directing distributions on an as-needed basis regardless of what the operating agreement says, examiners argue the transferor never actually gave up the control the discount is supposed to compensate for — which invites a Section 2036 argument to pull the full value back into the estate.
• Hiring an appraiser without a recognized valuation credential or without entity-specific analysis. A boilerplate report that applies an “industry standard” 35% discount without walking through the Mandelbaum factors or citing empirical restricted-stock and pre-IPO data is an easy target on cross-examination.
• Ignoring the entity’s own governing documents. If the operating agreement grants a right of first refusal, mandatory buyout terms, or specific distribution triggers, but the appraisal doesn’t reference any of them, the report looks disconnected from the actual legal restrictions it’s supposed to be pricing.
• Funding the entity with only cash or marketable securities and no operating purpose. Passive-asset-only entities face heavier scrutiny than entities that also run an active business, hold illiquid real estate with genuine management needs, or serve a documented non-tax purpose such as consolidating family investment decision-making.
• Skipping a contemporaneous appraisal at the date of transfer. Retroactive or backdated valuations, or appraisals commissioned only after an audit notice arrives, undercut credibility even when the underlying discount conclusion might otherwise be reasonable.

Practical Checklist Before Transferring a Discounted Interest

Key Takeaways

• Lack-of-control and lack-of-marketability discounts remain legally sound tools for valuing minority interests in family LLCs and FLPs, but the size of the discount is exactly what the IRS contests.
• Discounts should be built from empirical data — restricted stock studies, pre-IPO studies, and the Mandelbaum factors — not pulled from a generic industry percentage.
• Combined DLOC and DLOM discounts are applied sequentially, not additively, and typically land between roughly 22% and 45% depending on the underlying asset and entity type.
• The withdrawn 2016 Section 2704 proposed regulations didn’t end IRS scrutiny; the agency now leans on Section 2036 and economic substance arguments case by case.
• Funding timing, respected governing documents, and a credentialed, entity-specific appraisal are the strongest defenses against an audit challenge.

Frequently Asked Questions

What’s the difference between a discount for lack of control and a discount for lack of marketability?

A discount for lack of control reflects the reduced value of an ownership interest that cannot direct distributions, management, or a sale of the entity’s assets. A discount for lack of marketability reflects the reduced value that comes from having no ready market to sell that interest to an outside buyer. Both discounts can apply to the same minority interest, and appraisers typically apply them sequentially rather than adding the percentages together.

Are valuation discounts for family LLCs and FLPs still legal after the Section 2704 controversy?

Yes. The 2016 proposed regulations that would have curtailed certain discounts were withdrawn by Treasury in October 2017 and were never finalized. Valuation discounts remain a recognized part of gift and estate tax law, supported by decades of Tax Court precedent, though the IRS continues to challenge specific discount amounts and the facts surrounding how an entity was formed and operated.

How large can a combined valuation discount realistically be?

Combined discounts most often land somewhere between roughly 20% and 45% of pro-rata net asset value, depending on the type of underlying asset, the size of the transferred interest, and how restrictive the entity’s actual governing documents are. Passive investment holding entities tend to sit at the lower end of that range, while interests in operating businesses with real management complexity can support discounts toward the higher end.

What triggers an IRS audit of a discounted FLP or LLC transfer?

Common triggers include funding the entity shortly before a gift, sale, or death; an appraisal that lacks entity-specific analysis or empirical support; a transferor who continues to exercise informal control over distributions after the transfer; and entities holding only cash or marketable securities with no apparent business purpose beyond tax planning.

Does an IDGT sale of a discounted interest trigger capital gains tax?

No, as long as the trust is structured as a grantor trust for income tax purposes. Because the grantor and the trust are treated as the same taxpayer for income tax purposes, a sale between them is disregarded for income tax reporting, so no gain is recognized even though the sale is respected for gift and estate tax purposes.

Should a family avoid valuation discounts entirely given the increased scrutiny?

Not necessarily. The technique remains viable when the entity has a real operating history, the appraisal is independent and well-documented, and the family actually respects the entity’s governing terms after the transfer. The risk isn’t the discount concept itself — it’s discount amounts and fact patterns that look manufactured for a tax outcome rather than grounded in how a real buyer would price the interest.

References

• Internal Revenue Code Section 2704 and its legislative history concerning restrictions on liquidation rights.
• Treasury’s August 2016 proposed regulations under Section 2704 and the October 2017 withdrawal notice.
• Mandelbaum v. Commissioner, T.C. Memo 1995-255, and its enumerated marketability discount factors.
• Internal Revenue Code Section 2036 regarding retained life estates and transfers with retained enjoyment or control.
• Published restricted stock and pre-IPO discount studies commonly cited in business valuation practice.
• Published Tax Court decisions addressing family limited partnership and LLC valuation discounts.