721 UPREIT PROS / CONTRIBUTED PROPERTY RECORDS

Built-in gain after a Section 721 contribution: annual Section 704(c) record checklist

Keep the contribution-date property statement, each complete Schedule K-1 package, the Item N beginning-to-ending rollforward, Box 20 code AA detail and notices of later property events in one continuing file. Section 704(c) reporting can change from year to year, but the current K-1 alone may not reconstruct the original facts.

By 721 UPREIT Pros · September 30, 2026 · Original contribution-date and annual evidence checklist

This guide answers one narrow question: what records should an OP-unit holder preserve for Section 704(c) built-in gain after property is contributed in a potential Section 721 transaction? It supports the 721 UPREIT risk and due-diligence guide. It does not calculate an allocation, decide whether Section 721 applies, predict a property sale, or determine the tax result of an OP-unit redemption or conversion.

What is the Section 704(c) built-in-gain record?

It is the continuing evidence of the difference between a contributed property's fair market value and adjusted tax basis at contribution, plus the partnership's annual reporting of any remaining unrecognized amount and current-year allocations. Preserve the original contribution statement and every later tax package. Do not replace the history with a single current-year number.

Treasury Regulation Section 1.704-3, current through September 28, 2026 when checked on September 30, explains that Section 704(c) is intended to prevent the shifting of precontribution tax consequences among partners. It generally requires partnership allocations related to contributed property to take account of the difference between adjusted tax basis and fair market value at contribution. The regulation also says the rules apply property by property, subject to specific aggregation rules and exceptions.

IRS Publication 541, revised December 2025, explains the basic investor-facing concept: if the partnership sells contributed property, built-in gain or loss is allocated to the contributing partner, and cost-recovery allocations also take the disparity into account. Actual allocations depend on the partnership agreement, the chosen reasonable Section 704(c) method, the property and later events.

Why does the record continue after the contribution closes?

The original contribution file anchors the property, date, value and tax basis. Later K-1 reporting can show remaining unrecognized gain or loss and current-year allocations, but it may not repeat every original document or explain every movement in enough detail for the investor's preparer. A complete file lets the preparer trace annual information back to the closing record.

The 2025 Partner's Instructions for Schedule K-1 identify three especially useful records:

• Item M and its statement. When property with built-in gain or loss was contributed during the year, Item M is checked and the partnership attaches a statement with the property, contribution date and amount of built-in gain or loss. The instructions define that amount as the difference between fair market value and adjusted basis at contribution.
• Item N. The partnership reports the partner's beginning and ending share of net unrecognized Section 704(c) gain or loss. The instructions note that this can arise from contributed property or a partnership revaluation, sometimes called reverse Section 704(c).
• Box 20, code AA. This reports the portion of current-year income or deduction items allocated under Section 704(c). Those items are also included elsewhere among the K-1 income or deduction lines.

These records are related, but they are not interchangeable. Item M anchors contribution-year facts. Item N is an annual net unrecognized amount. Code AA identifies current-year income or deduction determined under Section 704(c). None of them, standing alone, states the investor's tax bill, cash received, outside basis or the proceeds of a future sale.

How should the three core records be organized?

If the investor also needs to reconcile the K-1 capital account with partner-level basis, use the separate K-1 capital account versus outside-basis worksheet. Outside basis and Section 704(c) built-in gain are different records. They may interact with the same transaction history, but one should not be substituted for the other.

What belongs in the annual Section 704(c) evidence file?

1. Lock the contribution-date anchor. Retain the exact legal owner, property description, contribution date, fair market value, adjusted tax basis, valuation support and initial built-in gain or loss. Preserve the version actually used at closing.
2. Save the full K-1 package. Keep the K-1, Item M statement, Item N fields, every Box 20 statement, state schedules, footnotes and later corrections. A single downloaded K-1 page is incomplete.
3. Roll Item N from beginning to ending. Compare this year's beginning amount with last year's ending amount for the same legal entity and partner. Record the partnership's explanation for the change rather than inventing a plug.
4. Trace current-year allocations. Preserve code AA detail and identify where those income or deduction items also appear on the K-1. Ask the preparer how they enter the return and the partner's continuing records.
5. Log property and partner events. Capture any sale, partial disposition, refinancing, transfer, distribution, partnership revaluation, OP-unit transfer, redemption or conversion notice. The event log is a prompt for analysis, not a tax conclusion.
6. Close with open questions visible. List missing statements, entity mismatches, unexplained Item N changes and pending professional conclusions. Carry unresolved items into next year's file.

Download the annual Section 704(c) checklist

Worked example: four numbers that should not be forced to match

This example is hypothetical, simplified and not a tax-return position. Assume an investor contributes a property with a documented fair market value of $2,400,000 and adjusted tax basis of $900,000. The contribution-year Item M statement therefore shows $1,500,000 of built-in gain. Assume the partnership's next annual K-1 reports $1,500,000 as beginning Item N and $1,350,000 as ending Item N. A Box 20 code AA statement separately reports $25,000 of current-year income determined under Section 704(c).

The $150,000 Item N movement and $25,000 code AA amount answer different questions. Do not assume the annual reduction in net unrecognized gain must equal code AA. The partnership may need to explain cost recovery, dispositions, aggregation, revaluations, method-specific allocations or other facts. The investor's file should preserve that explanation without trying to reverse-engineer a final tax result from summary fields.

The example also does not establish outside basis, tax-basis capital, market value of the OP units, a protected amount under an agreement, or gain from a later transaction. Keep those analyses separate.

Which later events deserve a dated record?

The record should not wait for a year-end K-1 when a material event occurs. Save the notice, effective date, affected property or units, governing agreement section and professional follow-up.

• Sale or partial disposition of contributed property. Publication 541 explains that built-in gain or loss is allocated to the contributing partner when the partnership sells contributed property. The actual allocation and character require the partnership's records.
• Distribution of contributed property to another partner. The 2025 Form 1065 instructions discuss a seven-year rule and a Box 20 code W statement for certain precontribution gain or loss. Do not treat seven years as a universal holding promise or the only relevant rule.
• Distribution of other property to the contributing partner. The partner instructions identify Section 737 as a separate possible issue and use Box 19 code B for a distribution subject to Section 737. The event requires professional review of the actual facts.
• Transfer of OP units or a partnership interest. The regulation states that remaining built-in gain or loss can follow a transferred partnership interest to the transferee under its rules. Preserve transfer documents and do not assume the record disappears.
• Partnership revaluation. Item N can include reverse Section 704(c) amounts created by a book-up or book-down. Ask whether Item N includes contributed-property amounts, revaluation amounts or both.
• Corrected tax package. Retain every version and use the late or corrected K-1 decision log before changing the annual file.

If the original contribution occurred after a DST holding period, preserve the separate DST-to-OP-unit transition-year record checklist. That page owns the entity and period cutover. This page carries the Section 704(c) property record forward after contribution.

Questions for the partnership and tax preparer

Ask the partnership or administrator

• Which property and contribution-date records support Item M and the initial built-in gain or loss?
• Does Item N include contributed-property Section 704(c), reverse Section 704(c), or both?
• What explains the change from beginning to ending Item N for this tax year?
• Which Section 704(c) allocation method applies to each relevant property?
• Which K-1 income or deduction lines include the amount reported under Box 20 code AA?
• Was any property sold, partially disposed of, transferred, distributed or replaced in a nonrecognition transaction?
• Is another statement, corrected package or lower-tier partnership detail still expected?

Ask the tax preparer

• Do the contribution-date fair market value, adjusted tax basis and initial built-in gain records agree?
• How should code AA items be reported and preserved in the continuing workpapers?
• Does the Item N movement require more support before the return is completed?
• Does a sale, transfer, distribution, revaluation or unit transaction require a separate analysis?
• Which records belong in the outside-basis schedule, and which belong only in the Section 704(c) file?
• What unresolved question should remain open for the partnership rather than be estimated?

Prepare investment and agreement questions separately

Section 704(c) work belongs with the partnership and the investor's tax professional. It does not tell the investor whether the operating partnership is financially strong, whether distributions are sustainable, or whether an agreement protects a future tax result. Use the separate tax-protection agreement checklist for contractual questions.

For follow-up education, compare this record checklist with DST 1031 Experts' discussion of 721 tax deferral, basis and trade-offs and its broader 721 UPREIT guide. Those pages provide broader context. This article owns the contribution-date and annual Section 704(c) evidence file.

If the partnership later reports a sale of the contributed asset, continue with the contributed-property sale tax-record handoff. It separates sale economics from partnership gain, partner allocation and tax character.

When the preparer also needs the original asset classifications and depreciation schedules, use the depreciation and property-history record chain. It keeps the annual Section 704(c) rollforward separate from the later Section 1245, Section 1250 and other character analysis.

One-minute video: preserve the Section 704(c) record

A one-minute silent explainer with English captions. The complete transcript is available below.

Sources and scope

Primary references checked September 30, 2026: Treasury Regulation Section 1.704-3, eCFR current through September 28, 2026; 2025 Partner's Instructions for Schedule K-1 (Form 1065), including Items M and N and Box 20 code AA; 2025 Instructions for Form 1065; and Publication 541, Partnerships, revised December 2025. Use instructions for the actual tax year and the investor's complete records.

General education by 721 UPREIT Pros with AI assistance. No independent professional review is represented. The example is hypothetical and does not determine Section 721 treatment, a Section 704(c) allocation, outside basis, capital account, gain recognition, depreciation, distribution treatment, sale timing, agreement coverage, investment suitability, liquidity or returns.