Form 8308: sale or exchange of a partnership interest
Form 8308 is the IRS form a partnership files to report a partner's sale or exchange of a partnership interest when part of the price is attributable to unrealized receivables or inventory items, a section 751(a) exchange. It is attached to Form 1065, and a copy goes to both the seller and the buyer.
“Partnerships file Form 8308 to report the sale or exchange by a partner of all or part of a partnership interest where any money or other property received in exchange for the interest is attributable to unrealized receivables or inventory items (that is, where there has been a section 751(a) exchange).” IRS, About Form 8308
Who has to file Form 8308?
The partnership files Form 8308, not the selling partner. According to the Instructions for Form 8308 (Rev. November 2025), a partnership must file a separate Form 8308 for each section 751(a) exchange of an interest in the partnership. A section 751(a) exchange is a sale or exchange of all or part of an interest where some of the money or property received is attributable to unrealized receivables or inventory items. The instructions add that, generally, any sale of an interest while the partnership holds those assets is a section 751(a) exchange.
No Form 8308 is needed when a Form 1099-B is required for the sale under section 6045, or when the transfer is entirely a gift. The filing duty starts once the partnership has notice: written notice from the transferor, or knowledge of a transfer made while it held unrealized receivables or inventory. Treas. Reg. 1.6050K-1(d) requires the transferor to give that notice within 30 days of the exchange, or by January 15 of the following year if earlier.
When is Form 8308 due and who gets a copy?
Form 8308, with Parts I through IV complete, is attached to Form 1065 for the partnership tax year that includes the last day of the calendar year in which the exchange took place. It is due with the return, including extensions. Separately, the partnership furnishes a copy with Parts I through III to both the transferor and the transferee by January 31 of the year after the exchange, or 30 days after it has notice, if later.
The November 2025 instructions dropped the requirement to furnish Part IV to the parties. The seller gets the Part IV column (c) amounts on Schedule K-1 (Form 1065) box 20 under codes AB, AC and AD instead, and the instructions tell a partner to rely on the K-1 if the two disagree. A partnership that learns of the exchange after Form 1065 is filed files Form 8308 within 30 days of notification, with a superseding return, an amended return or an administrative adjustment request (AAR), depending on its audit regime.
What goes on each part of Form 8308?
Form 8308 (Rev. October 2024) has four parts, and each one draws on a different document in the partnership file. Parts I and II identify the beneficial owner immediately before and immediately after the transfer. A nominee holder is looked through to the beneficial owner, and a disregarded entity is reported through its first regarded owner. Part III dates the transfer and classifies the interest, and Part IV is the only part with dollar amounts.
| Document | What it supplies | Form 8308 line |
|---|---|---|
| Transferor's written notice | Names, addresses and TINs of seller and buyer | Part I and Part II |
| Purchase agreement or assignment | Date of the sale or exchange | Part III, 1 |
| Partnership agreement | Capital, preferred, profits or other interest | Part III, 2 |
| Deemed sale computation | Partnership-level section 751(a) gain (loss) | Part IV, 1, column (a) |
| Fixed asset and collectibles records | Collectibles gain; unrecaptured section 1250 gain | Part IV, 2 and 3, column (a) |
| Capital account or unit register | Percentage or units transferred | Part IV, column (b1) or (b2) |
| Allocation of column (a) to the seller | Partner-level gain, reported in K-1 box 20 codes AB, AC, AD | Part IV, column (c) |
The form is signed only when it is filed by itself rather than with Form 1065. Column (a) is the entity-level figure for each category, column (b1) or (b2) is the share transferred, and column (c) is the seller's portion. If a partner is treated as transferring an interest because of a distribution but its ownership doesn't change, the instructions say to enter zero in column (b1) or (b2).
How is the section 751(a) gain on Form 8308 figured?
Treas. Reg. 1.751-1(a)(2) measures the ordinary part of the seller's gain with a hypothetical sale. The partnership is treated as selling all its property for fair market value immediately before the transfer, and the seller's share of income from section 751 property is ordinary. The rest of the gain on the interest is capital gain. Part IV also isolates collectibles gain under section 1(h)(5) and unrecaptured section 1250 gain under section 1(h)(6), because both are taxed above the regular long-term capital gain rates.
For example, Dana sells a 25% interest for an amount realized of $400,000, including her share of liabilities relieved. Her outside basis is $250,000. On a hypothetical sale, the partnership would recognize $120,000 on cash-method receivables, $80,000 of section 1245 recapture and $150,000 of unrecaptured section 1250 gain, and it shares income in proportion to interests.
| Step | Where it goes | Amount |
|---|---|---|
| Partnership-level 751(a) gain ($120,000 plus $80,000) | Part IV, 1, column (a) | $200,000 |
| Partnership-level unrecaptured section 1250 gain | Part IV, 3, column (a) | $150,000 |
| Interest transferred | Part IV, column (b1) | 25% |
| Dana's section 751(a) ordinary gain | Part IV, 1, column (c); K-1 box 20, code AB | $50,000 |
| Dana's unrecaptured section 1250 gain | Part IV, 3, column (c); K-1 box 20, code AD | $37,500 |
| Total gain ($400,000 less $250,000) | Dana's return | $150,000 |
| Capital gain ($150,000 less $50,000) | Form 8949 and Schedule D | $100,000 |
Dana reports the $50,000 on Form 4797 and the $100,000 on Form 8949, with $37,500 of it treated as unrecaptured section 1250 gain.
What penalties apply to Form 8308?
The Instructions for Form 8308 describe the penalties without stating dollar amounts. Penalties may be imposed for each failure to file a correct Form 8308 by the due date, including extensions, which covers incorrect or missing information, and the instructions point to sections 6721, 6724 and 6698. A separate penalty may apply to each failure to furnish a correct copy to the transferor or the transferee when due, under sections 6722 and 6724. Each penalty increases for intentional disregard, and each may be waived for reasonable cause and not willful neglect.
Treas. Reg. 1.6050K-1(g) also points to section 6722(b) for a transferor who fails to notify the partnership. Corrections depend on the audit regime. A BBA partnership that misreported the exchange on Schedule K-1 after the superseding return window closed files an AAR with a correct Form 8308, and a non-BBA partnership files an amended return. If only Form 8308 was missing and the K-1 was right, the partnership files Form 8308 by itself within 30 days of notification.
What do reviewers check on Form 8308?
A reviewer checking Form 8308 confirms six items, each tied to the Instructions for Form 8308 or a Treasury regulation. The first document to pull is the transferor's written notice, because it fixes the date the partnership had notice and therefore the furnishing deadline.
The reviewer also needs the purchase agreement, the partnership's deemed sale computation at fair market value immediately before the transfer, and the seller's and buyer's K-1s for the year. The deemed sale computation drives three places on the return: Part IV of Form 8308, box 20 of the seller's K-1, and any section 743(b) adjustment for the buyer if a section 754 election is in effect. Running all three from one computation keeps the seller's and buyer's numbers consistent.
Every line checked against the documents the client sent
Filed reads the transferor's notice, the purchase agreement, the deemed sale computation and the K-1s, then checks every line of Form 8308 against them. Anything that doesn't tie comes back as a review item with a citation to the source.
Book a demoForm 8308, Part IV, line 1, column (c) shows $50,000 of section 751(a) gain, but the seller's K-1 box 20, code AB reports $42,500. Confirm which deemed sale computation is final before the K-1 is furnished.
Common questions
Does the selling partner file Form 8308?
The selling partner does not file Form 8308; the partnership does. The seller has two duties of its own: notify the partnership in writing within 30 days of the exchange, or by January 15 of the next year if earlier, and attach the statement required by Treas. Reg. 1.751-1(a)(3) to its own return showing the date, the 751 gain or loss and the capital gain or loss.
Is Form 8308 required if the partnership has no inventory?
Form 8308 can be required even if the partnership has no inventory, because unrealized receivables count too. The Instructions for Form 8308 include cash-method receivables and the ordinary income part of section 1245 and 1250 property, so a partnership holding equipment with depreciation recapture has section 751 property when an interest is sold.
Do partners still receive Part IV of Form 8308?
Partners no longer receive Part IV of Form 8308. The Instructions for Form 8308 (Rev. November 2025) removed the requirement to furnish Part IV by January 31. The partnership still furnishes Parts I through III, files all four parts with Form 1065, and reports the seller's column (c) amounts in Schedule K-1 box 20 using codes AB, AC and AD.
Sources
- IRS, Instructions for Form 8308 (Rev. November 2025)
- IRS, Form 8308 (Rev. October 2024)
- IRS, About Form 8308
- Treas. Reg. 1.6050K-1, returns relating to sales or exchanges of certain partnership interests
- Treas. Reg. 1.751-1, unrealized receivables and inventory items
- IRC section 6050K, returns relating to exchanges of certain partnership interests