IRC §754 election and §743(b) basis adjustment: the partnership basis step-up on sale or death, the inside-vs-outside basis problem, the mandatory adjustment for substantial built-in losses, and the irrevocability of the election

When an interest in a partnership is sold or passes to an heir at death, a problem emerges that doesn't exist in the corporate world: the gap between the "outside basis" (what the new partner paid, or the stepped-up value at death) and the "inside basis" (the partnership's actual basis in its underlying assets). If this gap is not addressed, the new partner faces "phantom gain": they're allocated taxable income on assets they've already effectively paid for at current value.

IRC §754 is the mechanism to fix this. It allows the partnership to elect to adjust the basis of its assets to reflect the new partner's outside basis, aligning the inside and outside basis and eliminating the phantom gain problem. The actual computation of the adjustment is performed under §743(b), and the allocation of the adjustment among the partnership's assets follows §755.

The provision is technical, but its practical impact is substantial. For partnerships with appreciated assets (real estate, business goodwill, investments), a §754 election can save the transferee partner hundreds of thousands of dollars in tax on income that economically belongs to the pre-transfer period.

The inside-vs-outside basis problem

Partnership taxation operates on a dual-basis system:

Outside basis. Each partner has an "outside basis" in their partnership interest. This is generally what the partner paid for the interest (or, if the interest was received by gift or inheritance, the transferred or stepped-up basis). Outside basis increases with income allocations and additional contributions, and decreases with loss allocations and distributions.

Inside basis. The partnership has a "basis" in each of its assets (its "inside basis"). This is generally what the partnership paid for the assets, reduced by depreciation and adjusted for other items.

For an original partner who contributed cash to the partnership and has been allocated income and losses over time, the outside and inside basis are naturally aligned. But when a new partner acquires the interest by purchase or by inheritance, the alignment breaks.

Here's the core problem. Assume a partnership holds a building with an inside basis of $200,000 and a fair market value of $1,000,000. Partner A owns 50% and sells their interest to Partner B for $500,000 (50% of the $1,000,000 value). Partner B's outside basis is $500,000 (what they paid). But Partner B's share of the partnership's inside basis in the building is $100,000 (50% of the $200,000 basis).

Without a §754 election, when the partnership sells the building, it recognizes $800,000 of gain (the difference between the $1,000,000 value and the $200,000 basis). Partner B is allocated $400,000 of that gain (50%). But Partner B already paid $500,000 for an interest worth $500,000; the $400,000 of gain is "phantom" to the extent it reflects appreciation that occurred before Partner B bought in. Partner B is taxed on gain that economically accrued to Partner A.

The §754 election fixes this by adjusting the partnership's inside basis in its assets, specifically for Partner B, to reflect Partner B's $500,000 outside basis. Partner B's share of the building's basis is stepped up from $100,000 to $500,000, eliminating the phantom gain.

The death scenario

The problem is even more acute when a partnership interest passes at death. Under §1014, the heir receives a stepped-up basis equal to the fair market value of the interest at the date of death. If the decedent's 50% interest in the partnership was worth $500,000 at death, the heir's outside basis is $500,000.

Without a §754 election, the heir's share of the partnership's inside basis remains at the original $100,000, and the heir faces $400,000 of phantom gain on the sale of the building even though they received the interest at a $500,000 stepped-up basis. The step-up at death is supposed to eliminate the tax on pre-death appreciation; without the §754 election, the step-up applies to the outside basis but not to the inside basis, defeating the purpose.

The §754 election is critical in the death context. Estate planning for partners should always consider whether a §754 election is in place, because the absence of one can substantially reduce the economic benefit of the §1014 step-up.

How §743(b) works

When a §754 election is in effect and a partnership interest is transferred (by sale, exchange, or death), §743(b) computes the basis adjustment:

The adjustment equals the difference between the transferee's outside basis and their proportional share of the partnership's adjusted basis in its assets.

The adjustment is specific to the transferee partner. Other partners' allocations are not affected; only the transferee's share of income, gain, loss, and deduction is adjusted.

The adjustment is allocated among the partnership's assets under §755, which divides the partnership's assets into two classes (capital/§1231 assets and ordinary-income assets) and allocates the adjustment based on the difference between the fair market value and the basis of each asset.

The mechanics produce a "special basis adjustment" that is tracked separately on the transferee partner's records and reflected in the partnership's Schedule K-1 reporting.

The irrevocability

The §754 election, once made, applies to all future partnership interest transfers and all future distributions of partnership property (under §734(b)). The election is irrevocable.

The irrevocability is the primary reason some partnerships do not make the §754 election. Once made, every future transfer of a partnership interest triggers a §743(b) calculation, and every future distribution of property triggers a §734(b) calculation. For partnerships with many partners and frequent transfers (large investment funds, for example), the administrative burden of tracking individual basis adjustments for every partner can be substantial.

For smaller partnerships with infrequent transfers, the irrevocability is less concerning, because the adjustments are infrequent and the benefit (eliminating phantom gain for transferee partners) is clear.

The partnership makes the election by attaching a statement to its return for the year of the transfer. The election must be filed with a timely return (including extensions). A late election requires IRS approval.

The mandatory adjustment for substantial built-in losses

Since the TCJA (Tax Cuts and Jobs Act of 2017), the §743(b) adjustment is mandatory (without a §754 election) when the partnership has a "substantial built-in loss" following the transfer. Per §743(d), a substantial built-in loss exists when the partnership's adjusted basis in its assets exceeds the fair market value of those assets by more than $250,000.

The mandatory adjustment means that if the partnership's assets have depreciated substantially (basis exceeds value by more than $250,000), the transferee partner automatically gets a downward basis adjustment even without a §754 election. This prevents the transferee from claiming losses on depreciated assets that the transferee "bought at a loss" (i.e., the transferee paid fair market value for the interest, which is less than the proportional inside basis).

The mandatory adjustment addresses the mirror image of the phantom gain problem: without it, a transferee buying into a loss partnership could claim losses that economically accrued before the transfer.

The distribution side: §734(b)

When a §754 election is in effect, it also applies to distributions of partnership property under §734(b). If the partnership distributes property and the distribution produces a gain or loss to the distributee partner (or the distributed property has a different basis in the partner's hands than in the partnership's hands), the partnership adjusts its basis in the remaining assets.

The §734(b) adjustment is less commonly discussed than the §743(b) adjustment, but it's part of the same election. Making the §754 election triggers both; the partnership cannot elect one without the other.

Coordination with other small business provisions

The §754 framework coordinates with several other Halstonberg small business provisions:

Partnership tax fundamentals cover the basic partnership tax structure, including the dual-basis system that creates the inside-vs-outside basis problem.

§721 partnership formation covers the initial contribution of property to a partnership, which establishes the original inside basis.

Business succession planning frequently involves the transfer of partnership interests at death or by gift, where the §754 election determines whether the inside basis is stepped up to match the transferred outside basis.

§1031 like-kind exchanges can interact with the §754 framework when a partnership exchanges real property, because the exchange affects the partnership's inside basis in its assets.

Cost segregation studies can affect the inside basis of a partnership's real property assets, which in turn affects the magnitude of the §743(b) adjustment when an interest is transferred.

Practical guidance

For partnerships and their advisors:

If the partnership holds appreciated assets and partnership interests are likely to be transferred (by sale or at death), the §754 election is almost always beneficial. The elimination of phantom gain is the primary justification, and the administrative burden is manageable for partnerships with relatively few partners and infrequent transfers.

For estate planning, confirm whether the partnership has a §754 election in place before relying on the §1014 step-up. Without the election, the step-up applies to the outside basis but not the inside basis, creating phantom gain that defeats the economic benefit of the step-up. If the partnership doesn't have an election and a partner is elderly or in poor health, consider making the election before the death occurs.

For buyers of partnership interests, negotiate for the partnership to have a §754 election in place (or to make one at the time of the transfer). Without it, you face the phantom gain problem on pre-acquisition appreciation. The election protects you; the absence of one hurts you.

For large partnerships with many partners and frequent transfers, weigh the administrative burden against the benefit. The irrevocability means the election applies to every future transfer; if the partnership regularly admits and redeems partners, the tracking burden can be substantial. Some large partnerships avoid the election and let the phantom gain issue be addressed at the partner level (though this is generally less efficient).

For partnerships with assets that have depreciated substantially (basis exceeds value by more than $250,000), the §743(b) adjustment is mandatory regardless of whether a §754 election exists. The mandatory adjustment operates automatically.

File the election on time. The §754 election must be attached to a timely-filed return. A late election requires an application to the IRS under the regulations, which is more burdensome.

The §754 election is a foundational partnership tax planning tool. For partnerships with appreciated assets and expected transfers (which describes most real estate partnerships, family partnerships, and closely-held operating partnerships), the election eliminates one of the most significant distortions in partnership taxation. The irrevocability and the administrative burden are the costs; for most partnerships, the benefits clearly outweigh them.