I’m Selling a Cost-Segregated Real Estate Partnership Interest. Is the Gain Ordinary?

Not necessarily all of it. When you sell a real estate partnership interest, Section 751(a) generally makes your share of gain attributable to the partnership's “hot assets” ordinary. A prior cost-segregation study can increase the importance of this test because shorter-lived Section 1245 components may carry potential ordinary depreciation recapture. The remaining partnership-interest gain may include unrecaptured Section 1250 gain and other capital gain. The partnership's asset-level records—not a single rate applied to the check you receive—must support the split. The IRS Form 8308 instructions require separate reporting of these categories.

If a sale is being negotiated or a K-1 has arrived without the character breakdown, AE can reconcile the sale agreement, outside basis, liability relief, cost-segregation schedule, and partnership reporting before your return is filed.

Start with the interest sale, not a direct building sale

A partner selling an interest generally calculates total gain or loss from amount realized less adjusted outside basis. Amount realized includes cash and other consideration plus the selling partner's relief from partnership liabilities; outside basis also reflects the partner's liability share and prior adjustments. IRS Publication 541 gives a liability-relief example. Selling the interest is not the same transaction as the partnership selling its rental building. For asset-level sale recapture, use AE's Section 1245-versus-1250 property-sale guide; this page addresses the partner-level transfer.

Next, the partnership computes the seller's share of ordinary gain or loss as if it had sold its assets for fair market value immediately before the interest transfer. Section 751(a), not Section 751(b), governs the sale of the interest. Section 751(b) addresses certain disproportionate distributions of hot and non-hot assets—a separate transaction requiring its own analysis. The Form 8308 instructions describe the deemed-sale calculation, while Publication 541 explains the interest-sale character split.

What counts as a hot asset after cost segregation?

Hot assets include unrealized receivables and inventory. “Unrealized receivables” is broader than an unpaid invoice: it also includes potential ordinary-income gain from certain property if the partnership sold it at fair market value on the transfer date. For a cost-segregated rental, that can include recapture on Section 1245 personal-property components and any ordinary recapture on Section 1250 property. The IRS identifies these categories in Form 8308 instructions and Publication 541. The study's five-, seven-, or fifteen-year recovery label alone does not settle whether an asset is Section 1245 or Section 1250 property.

Do not label all prior building depreciation “Section 751 ordinary income.” Straight-line building depreciation may instead contribute to unrecaptured Section 1250 gain, a separately reported capital-gain category subject to a maximum 25% rate for applicable individual taxpayers—not an automatic flat 25% tax. Form 8308 Part IV distinguishes hot-asset ordinary gain, collectibles gain, and unrecaptured Section 1250 gain. If the partnership also has receivables, development inventory, or other hot assets, those belong in the same partnership-level review; a rental-property label does not exempt the partnership from the test.

Illustration: one check, three possible characters

Assume a partner sells an entire interest for $700,000 cash, is relieved of $100,000 of partnership liabilities, and has $400,000 of adjusted outside basis immediately before the transfer. The simplified amount realized is $800,000 and the total gain is $400,000. Assume the partnership's supported deemed-sale workpaper assigns $120,000 of that seller's gain to Section 751 ordinary hot assets and $80,000 to unrecaptured Section 1250 gain. The remaining $200,000 is other capital gain if the interest's holding period and other facts support long-term treatment. The $80,000 is not added again to the $400,000 total; it is one part of it. These numbers are illustrative—actual Section 751 ordinary gain can even exceed net interest-sale gain and leave a capital loss, so do not force a percentage of the check into each bucket.

An installment note does not necessarily defer the hot-asset portion. Publication 541 says gain allocable to unrealized receivables or inventory is reported in the sale year even when the remainder qualifies for installment treatment. Review any note terms and sale-year reporting with the character schedule before signing. The buyer's possible Section 743(b) basis adjustment is a different, transferee-specific computation; it does not erase the seller's Section 751 amount.

What the partnership and seller should reconcile

1. Notify the partnership of the transfer. Send the executed agreement, date, ownership percentage, buyer and seller information, and consideration. Ask who will prepare the Section 751 and Form 8308 calculations before the K-1 is finalized.
2. Build the basis and liability rollforward. Reconcile beginning outside basis, contributions, distributions, allocations, prior Section 743(b) adjustments if applicable, and the seller's share of debt through closing. Do not use tax-basis capital on the K-1 as a substitute for outside basis.
3. Value and classify the partnership assets. Tie the fixed-asset ledger and cost-segregation study to current fair values, adjusted bases, accumulated depreciation, receivables, and inventory. A stale study allocation or book-only value is not a sale-date deemed-sale workpaper.
4. Reconcile the reported character. Current Form 8308 instructions call for Part IV to show entity- and seller-level hot-asset gain, collectibles gain, and unrecaptured Section 1250 gain. The partnership reports the seller's relevant amounts on Schedule K-1 box 20, codes AB, AC, and/or AD; the seller generally reports Section 751 gain or loss on Form 4797 and capital gain or loss on Form 8949, as applicable. Avoid reporting the same amount twice.
5. Match federal, state, and deal records. State conformity, prior depreciation, installment terms, and any foreign-transferor requirements can change the final filing package. Have the sale agreement and tax return agree on the transferred interest and timing.

Form 8308, the K-1, and a return already filed

A partnership generally files Form 8308 for a Section 751(a) exchange once it has notice, unless an instruction-level exception applies. Under the November 2025 Form 8308 instructions, completed Parts I–IV are generally attached to the relevant Form 1065; Parts I–III go to transferor and transferee by the stated January 31 or later-notice deadline, while the seller's character amounts are furnished through the K-1 reporting. Do not assume a preliminary copy of Form 8308 is the final taxable gain calculation.

If the partnership return is already filed, first identify what is wrong. The IRS instructions distinguish a missing Form 8308 with otherwise correct K-1 amounts from an incorrect K-1 character amount. If a superseding return is still timely, it may be available. After that period, a non-BBA partnership may need an amended Form 1065 and corrected K-1, while a BBA partnership may need an administrative adjustment request; the instructions specify timing and exceptions. AE's AAR-versus-amendment guide explains that separate filing decision. Do not amend only the seller's Form 1040 based on an estimate while the partnership's reporting remains inconsistent.

Documents to bring before closing or amending

• Interest purchase agreement, closing statement, note and payment schedule, ownership and debt schedules immediately before and after transfer.
• Seller's outside-basis rollforward, prior Schedules K-1 and returns, capital-account reconciliation, and records of distributions or prior partner-specific adjustments.
• Partnership asset ledger, cost-segregation report, depreciation history, sale-date valuations, receivables and inventory detail, and Section 1245/1250 classification support.
• Draft or filed Form 1065, seller's K-1 box 20 statement, Form 8308, and any Form 4797, Form 8949, Schedule D, or state sale schedules.

Failure points that change the tax result

• Treating the whole partnership sale as capital gain. The Section 751 deemed-sale computation can create ordinary gain even when the transferred asset is an interest in an LLC taxed as a partnership.
• Calling all depreciation ordinary recapture. Section 1245, possible Section 1250 ordinary recapture, unrecaptured Section 1250 gain, and other gain are different character calculations.
• Ignoring debt relief or using K-1 capital as outside basis. Either can distort total gain before character is allocated.
• Assuming restructuring or collecting receivables makes the tax disappear. A change in accounting method, pre-sale collection, or asset transfer may accelerate other income, trigger transfer rules, or change the economics. Model actual consequences; do not promise capital-gain treatment by moving assets on paper.
• Missing the partnership reporting handoff. An incomplete Form 8308 or inconsistent K-1 can require correction by the partnership and then the seller, with different routes for BBA and non-BBA partnerships.

This is a federal framework, not a tax conclusion for every sale. Tiered partnerships, prior Section 743(b) adjustments, special allocations, foreign owners, partial-interest transfers, and state law need fact-specific review. AE can reconcile the asset-level study to the sale workpaper, Form 8308, seller K-1, and the owner return before filing or correcting it.