What Is Section 751(b)? Hot Assets and Deemed Exchanges

Section 751(b) of the Internal Revenue Code is the rule that stops partners from using a partnership distribution to convert ordinary income into capital gain. When a distribution changes a partner’s proportionate share of the partnership’s “hot assets” — its unrealized receivables and substantially appreciated inventory — the disproportionate portion is pulled out of the normal tax-free distribution rules and taxed as if the partner and the partnership had swapped property at fair market value. The concept is simple. The execution is not.

What Counts as a Hot Asset

The statute never uses the phrase “hot asset,” but practitioners use it to describe the two categories of ordinary-income property that Section 751 singles out: unrealized receivables and substantially appreciated inventory items.¹ Everything else the partnership owns — cash, investment securities, real estate held for appreciation, other capital and Section 1231 assets — is “cold.”

Unrealized Receivables

Section 751(c) starts with the obvious case: rights to payment for goods delivered or services performed that the partnership has not yet included in income. A cash-method law firm’s billed-but-uncollected fees are the textbook example.

The definition then reaches further. Built-in ordinary-income recapture on partnership property is also treated as an unrealized receivable, including depreciation recapture under Sections 1245 and 1250 and recapture tied to mining exploration and oil and gas property.¹ A partnership holding fully depreciated equipment may not think of itself as owning hot assets, but the recapture gain baked into that equipment qualifies.

Substantially Appreciated Inventory

Section 751(d) defines inventory broadly to cover property held for sale to customers and any other property that would produce ordinary income (not capital or Section 1231 gain) if the partnership sold it.¹ Accrual-method receivables often land here.

The catch for 751(b) is that inventory is only hot if it has “appreciated substantially in value,” meaning the partnership’s inventory as a whole has a fair market value exceeding 120% of its adjusted basis.¹ Inventory with a $90,000 basis and a $100,000 fair market value sits at 111% and does not qualify. Push the basis down to $80,000 and it hits 125% and does.

Two features of this test matter. First, it is applied to inventory in aggregate, not item by item. Second, it applies only to distributions under Section 751(b). When a partner sells their partnership interest under Section 751(a), all inventory is treated as hot regardless of appreciation — a 2017 change that did not extend to 751(b).²

When a Distribution Is Disproportionate

Identifying hot assets is only half the analysis. Section 751(b) fires only when a distribution shifts a partner’s proportionate share of those assets relative to the partnership’s cold assets. A truly pro-rata distribution, where the partner takes their exact slice of each category, does not trigger the rule.²

Proportion is measured by reference to the gross fair market value of the partnership’s assets at the time of the distribution, not book value or tax basis.³ Two flavors of imbalance trigger the rule:

The partner receives more than their share of cold assets and gives up part of their hot-asset interest in return.
The partner receives more than their share of hot assets and gives up part of their cold-asset interest in return.

A worked example makes the mechanics concrete. A 25% partner sits in a partnership that holds $200,000 of substantially appreciated inventory (hot) and $600,000 of investment securities (cold). The partner’s proportionate share is $50,000 of hot and $150,000 of cold. If the partnership distributes $200,000 in cash, the partner has walked away with $50,000 more cold than their share, and is treated as having surrendered the full $50,000 of their hot-asset interest to get it. That shift is what Section 751(b) taxes.

How the Deemed Exchange Works

Once a distribution flunks the proportionality test, the existing 1956 regulations treat the disproportionate slice as a two-step transaction between the partner and the partnership.¹

Step one: the partnership is treated as first distributing to the partner the assets the partner is giving up. In the example above, that is the partner’s relinquished $50,000 share of inventory. This deemed distribution is governed by the ordinary Section 731 nonrecognition rules, with the partner taking a carryover basis in the property.

Step two: immediately after that deemed distribution, the partner and the partnership are treated as exchanging property at fair market value. The partner hands back the hot assets received in step one and receives the excess cold assets that were actually distributed. Both sides recognize gain or loss on the exchange. The partnership-level gain or loss flows through to the remaining partners under their profit-sharing ratios; the distributee partner is excluded.

Character of the Gain

Character is set by the property each side gives up, not what it receives. That is the whole point of the rule: it locks in the ordinary character of income that would otherwise ride out of the partnership as capital gain.

Take the receivables case. A partner’s relinquished share of unrealized receivables has a $0 basis and a $50,000 fair market value. In the deemed exchange the partner surrenders those receivables for $50,000 cash and recognizes $50,000 of ordinary income — the same result that would have followed if the partnership had collected the receivables and distributed the proceeds. When the partnership gives up cold assets to fund the distribution, its gain on those cold assets is capital.

Basis After the Fact

After the deemed exchange, the partner takes a fair-market-value basis in the property actually received, which prevents the same economic gain from being taxed a second time on a later sale.

What Falls Outside Section 751(b)

The rule reaches only actual distributions of partnership property to a partner acting as a partner. Several common transactions look adjacent but are not covered:

Contributions of property to a partnership are governed by Section 721 and are not distributions.⁴
Distributions returning previously contributed property to the contributing partner are carved out by Section 751(b)(2)(A).
Payments to a partner acting as a non-partner (Section 707(a)) are treated as transactions with an outsider.
Guaranteed payments under Section 707(c) are already ordinary income, so there is nothing for 751(b) to protect.
Gifts of a partnership interest and transfers at death are not distributions of partnership property.

Retiring Partners and Section 736

Payments to a retiring partner or a deceased partner’s successor are split by Section 736. Amounts paid for the retiring partner’s share of partnership property fall under Section 736(b) and are treated as distributions, so Section 751(b) can apply to any disproportionate portion.⁵ Other amounts, including payments for unrealized receivables and (usually) goodwill, run through Section 736(a) as distributive shares or guaranteed payments rather than distributions.

The exclusion of unrealized receivables from the Section 736(b) bucket applies only when the retiring partner was a general partner and capital was not a material income-producing factor for the partnership. That test typically covers service partnerships like law firms and consulting practices. For capital-intensive partnerships, the retiree’s share of unrealized receivables stays inside Section 736(b), and Section 751(b) applies in the usual way.

Tiered Partnerships

When a partnership owns an interest in another partnership, Section 751(f) looks through the upper-tier partnership and treats it as owning its share of the lower tier’s assets for classification purposes.¹ Hot assets cannot be buried a level down. In a multi-tier structure that means inventorying hot and cold assets at every level before running the proportionality test.

Where the Rules May Be Heading

The regulations under Section 751(b) date to 1956. In November 2014 the IRS published proposed regulations that would replace the current framework with a “hypothetical sale” approach: the partnership would calculate each partner’s share of ordinary income if all partnership property were sold at fair market value just before the distribution, compare that to each partner’s share of ordinary income after the distribution, and treat any reduction as a Section 751(b) amount subject to immediate tax.⁶

The proposed rules would also drop the rigid two-step asset-exchange framework in favor of any reasonable method consistent with the statute’s anti-conversion purpose, and would require a Section 704(b) revaluation of partnership property in connection with hot-asset distributions. The hypothetical-sale calculation would incorporate Section 704(c) principles, so it would account for built-in gains and losses tied to specific partners’ prior contributions — something the current gross-value method ignores.

As of 2026 those proposed regulations have not been finalized. The 1956 regulations and the deemed-exchange mechanics described above remain the law.

1
Office of the Law Revision Counsel. 26 U.S. Code 751 – Unrealized Receivables and Inventory Items
2
Internal Revenue Service. 26 CFR 1.751-1 – Unrealized Receivables and Inventory Items
3
Internal Revenue Service. Notice 2006-14 – Certain Distributions Treated as Sales or Exchanges
4
Office of the Law Revision Counsel. 26 U.S. Code 721 – Nonrecognition of Gain or Loss on Contribution
5
Office of the Law Revision Counsel. 26 U.S. Code 736 – Payments to a Retiring Partner or a Deceased Partners Successor in Interest
6
Federal Register. Certain Distributions Treated as Sales or Exchanges – Proposed Rule