Improvement 1031 Exchange Guide
An improvement 1031 exchange, often called a construction or build-to-suit exchange, is a structure for acquiring replacement real property that is improved before you receive it. The practical answer is strict: improvements count only to the extent they are part of the replacement property you receive within the exchange period. Future work after you take title does not become replacement property in the exchange just because it was planned from the start.
The common safe-harbor structure uses an exchange accommodation titleholder, or EAT, under Rev. Proc. 2000-37. The EAT parks the replacement property while improvements are made, and the taxpayer receives the improved property before the deadline. That deadline does not stretch to fit the construction schedule. In a deferred exchange, the replacement property must be received by the earlier of 180 days after the relinquished property transfer or the due date, including extensions, of the federal income tax return for the transfer year (IRS Fact Sheet FS-2008-18; Rev. Proc. 2004-51).
What an improvement exchange is
Section 1031 is a deferral rule, not a tax-free step-up. The IRS describes like-kind exchange gain as tax-deferred rather than forgiven, and current Form 8824 instructions limit section 1031 treatment to real property held for business or investment use, other than real property held primarily for sale (IRS Fact Sheet FS-2008-18; Instructions for Form 8824).
A standard delayed exchange works well when the replacement property already exists. A construction exchange is used when the investor wants the replacement property to include new construction, tenant improvements, renovations, or other work before the investor receives it. The reason structure matters is that a taxpayer generally cannot exchange real estate for improvements made to land the taxpayer already owns. Rev. Proc. 2004-51 states that an exchange of real estate owned by a taxpayer for improvements on land owned by the same taxpayer does not meet section 1031 requirements.
That is why improvement exchanges usually focus on who owns the replacement land during construction. If the taxpayer already owns the land, later construction on that land is not property received from another party in the exchange. If an EAT or other accommodation party holds the property under a qualifying parking arrangement, the taxpayer can receive the land and completed improvements as replacement property when the exchange closes.
How Rev. Proc. 2000-37 parking works
Rev. Proc. 2000-37 provides a safe harbor for certain parking transactions through a qualified exchange accommodation arrangement, or QEAA. Under the source packet, the IRS safe harbor treats the EAT as the beneficial owner of property held in a QEAA if the exchange otherwise satisfies section 1031 and the revenue procedure requirements (Rev. Proc. 2004-51).
In the improvement exchange context, the basic sequence is:
- The taxpayer transfers the relinquished property as part of an intended exchange.
- An EAT acquires or holds qualified indicia of ownership of the replacement property.
- The taxpayer and EAT enter into the QEAA within the required safe-harbor timing.
- Exchange proceeds are applied to the parked replacement property and improvements.
- The taxpayer receives the replacement property before the exchange period closes.
The source packet includes IRS written-determination language describing a QEAA entered into within five business days of the lease date and stating that the taxpayer had a bona fide intent for the property held by the titleholder to represent replacement property in a section 1031 exchange (IRS Written Determination 202520001).
This article focuses on the Rev. Proc. 2000-37 safe harbor. The IRS has also said that no inference is intended for similar arrangements outside the safe harbor and that parking transactions can be accomplished outside it (IRS Field Attorney Advice 20050203F). Non-safe-harbor structures are more fact-specific and should be reviewed by tax counsel before closing.
The 180-day construction constraint
The construction schedule is the hardest part of an improvement exchange. A project can be permitted, financed, and contracted, but section 1031 still looks to the replacement property received within the exchange period.
For a deferred exchange, the IRS states two core timing limits: replacement property must be identified within 45 days after the relinquished property transfer, and the replacement property must be received and the exchange completed no later than the earlier of 180 days after the sale or the due date, with extensions, of the income tax return for the year in which the relinquished property was sold (IRS Fact Sheet FS-2008-18). Rev. Proc. 2004-51 states the same statutory deadline as the earlier of 180 days after transfer or the tax-return due date, determined with regard to extensions.
For replacement property that is to be produced, the identification must include the underlying land and construction detail. The IRS written determination in the source packet states that produced replacement property must be identified by a legal description of the underlying land and as much detail as practicable regarding the construction improvements at the site (IRS Written Determination 202520001).
If the project is not complete by the deadline, the exchange does not get extra time merely because contractors are still working. The source packet describes a structure in which, if construction was not completed within 180 days of the QEAA date, the titleholder would transfer the replacement property before full completion to complete the section 1031 exchange under Rev. Proc. 2000-37.
When improvements count
Improvements count when they are part of the real property received in the exchange. Land plus completed improvements can be replacement real property. Planned improvements, unspent construction funds, and work performed after the taxpayer owns the replacement property are different.
The IRS fact sheet gives a useful boundary: most real estate is like-kind to other real estate, but improvements conveyed without land are not like-kind to land (IRS Fact Sheet FS-2008-18). Rev. Proc. 2004-51 gives another boundary: exchanging property for improvements on land already owned by the same taxpayer does not satisfy section 1031.
The result is simple but unforgiving. If the EAT transfers a partially improved property on day 180, the land and improvements then conveyed may be part of the replacement property. Work finished on day 181, after the taxpayer owns the property, is not replacement property received in the exchange. The taxpayer may still improve the property later, but later work does not absorb exchange proceeds for section 1031 deferral.
The IRS written determination also addresses leftover construction funds. It states that if all relinquished-property proceeds are not fully reinvested in construction improvements, the taxpayer will receive the remaining funds as boot and recognize gain to the extent of that boot (IRS Written Determination 202520001).
Hypothetical construction example
Assume an investor sells business or investment real property for $900,000 with an adjusted basis of $500,000. Debt, closing costs, depreciation recapture character, and exchange expenses are ignored to keep the illustration focused on the construction timing.
The EAT parks replacement land for $650,000. Before the exchange deadline, $220,000 of improvements are completed and conveyed with the land. The investor originally wanted another $80,000 of work, but that work will be done after the investor receives the property. At the transfer date, $30,000 of exchange funds remain unused.
| Item | Hypothetical amount |
|---|---|
| Sale price of relinquished property | $900,000 |
| Adjusted basis | $500,000 |
| Realized gain | $400,000 |
| Replacement land received | $650,000 |
| Completed improvements received before deadline | $220,000 |
| Exchange funds not reinvested before transfer | $30,000 |
In this simplified example, the investor received $870,000 of replacement property within the exchange period: $650,000 of land plus $220,000 of completed improvements. The $80,000 of later construction is not counted as replacement property in the exchange because it is not received before the exchange closes. The $30,000 of unused exchange funds is cash boot. Because the realized gain is $400,000, the recognized gain in this simplified example is $30,000, and the remaining $370,000 is deferred.
The lesson is not that every project should stop at day 180. It is that the tax exchange must close based on what can actually be transferred in time.
Practical watchpoints
Start with the deadline, not the construction wish list. Identify the replacement property in writing within 45 days, including the legal description and as much construction detail as practicable for produced property. Then build a budget that distinguishes work likely to be completed before transfer from work that may continue afterward.
Avoid treating parked-property rules as a cure for taxpayer-owned land. Rev. Proc. 2004-51 limits the Rev. Proc. 2000-37 safe harbor when the taxpayer owned the intended replacement property during the 180-day period ending on the date qualified indicia of ownership are transferred to the EAT. That rule matters for investors who already control a parcel and want to use exchange proceeds to build on it.
Keep exchange proceeds out of the taxpayer’s control. The IRS fact sheet warns that taking control of cash or other proceeds before the exchange is complete may disqualify the transaction. It describes use of a qualified intermediary or other exchange facilitator as one way to avoid premature receipt. That is a proceeds-control point, not a statement that every possible exchange structure is identical.
Finally, plan reporting early. Form 8824 is used to report each exchange of business or investment real property for like-kind real property, and Part III is used to figure gain required to be reported when cash or non-like-kind property is involved (Instructions for Form 8824).
Frequently asked questions
It is a 1031 exchange structure in which replacement real property is improved before the taxpayer receives it. In the common Rev. Proc. 2000-37 safe-harbor version, an exchange accommodation titleholder parks the replacement property while improvements are made.
Only improvements that are part of the replacement property received within the exchange period count in the exchange. Work completed after the taxpayer receives the property may improve the property economically, but it is not replacement property received in that exchange.
For a deferred exchange, the replacement property must be received by the earlier of 180 days after the relinquished-property transfer or the due date, including extensions, of the federal income tax return for the transfer year.
Rev. Proc. 2004-51 states that exchanging real estate for improvements on land owned by the same taxpayer does not meet section 1031 requirements, and it limits the Rev. Proc. 2000-37 safe harbor when the taxpayer owned the intended replacement property during the specified 180-day lookback period.
The source packet describes unused relinquished-property proceeds that are not reinvested in construction improvements as boot. Boot can require gain recognition to the extent of the boot, subject to the taxpayer's realized gain and other facts reported on Form 8824.
Educational disclaimer
This article is for general tax education only. It is not legal, tax, accounting, or investment advice, and it does not evaluate your documents, deadlines, related-party issues, financing, depreciation, state tax treatment, or reporting position. Improvement exchanges are document-heavy and deadline-sensitive; review the structure with a qualified tax advisor before signing purchase, construction, parking, or exchange agreements.
Primary sources
- IRS Fact Sheet FS-2008-18, Like-Kind Exchanges Under IRC Section 1031
- Instructions for Form 8824 (2025), Internal Revenue Service
- IRS Written Determination 202520001
- Rev. Proc. 2004-51, Treasury archive
- IRS Field Attorney Advice 20050203F