A standard 1031 exchange assumes you are trading one finished property for another. An improvement exchange, sometimes called a build-to-suit exchange, assumes something different: that the replacement property does not fully exist yet, and that some of your exchange proceeds will go toward building it out before the clock runs out.
That structure can unlock a lot of flexibility. It can also turn a manageable 180-day exchange into a construction project with a hard deadline. Below are the topics worth raising with your advisors before you commit to this path.
What makes an improvement exchange different
In a typical exchange, a qualified intermediary holds your sale proceeds and uses them to acquire a replacement property that already exists in the form you want. In an improvement exchange, the intermediary (or more precisely, an exchange accommodation titleholder, or EAT) takes title to the replacement property first and directs construction or renovation using your exchange funds, before the property is deeded to you.
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The mechanism that makes this legal is a parking arrangement under Revenue Procedure 2000-37, the same safe harbor that governs reverse exchanges. The EAT parks title to the property, oversees or contracts for improvements, and transfers the completed (or partially completed) asset to you once the exchange period closes.
The 180-day clock does not pause for construction
This is the detail that trips people up most often. Whether you are building from the ground up or making substantial renovations to an existing structure, all of it has to happen inside the same 180-day exchange window that governs any other 1031 exchange. Permitting delays, weather, subcontractor scheduling, and supply chain hiccups do not extend the deadline.
Questions worth reviewing with your advisors and a general contractor before you commit exchange proceeds to construction:
- Is the construction timeline realistic within 180 days, accounting for permitting and inspection lead times in this jurisdiction?
- What happens to unfinished improvements if the exchange period closes before construction is complete?
- Does the property still qualify for like-kind treatment if delivered partially finished?
Only completed improvements count toward exchange value
The IRS looks at what has actually been built and paid for by the end of the exchange period, not what is contractually promised. If you identify a replacement property with $500,000 in planned improvements but only $300,000 of that work is complete and paid for when the exchange closes, only the completed portion typically counts toward satisfying your exchange requirements.
That gap between planned and completed value can create unexpected boot, the taxable portion of an exchange that occurs when you receive value that is not offset by like-kind replacement property. Topics to clarify with a tax advisor here include how progress payments are tracked, what documentation the EAT needs from contractors at each draw, and how a shortfall in completed value would be treated.
Identification rules still apply, with a twist
Like any exchange, you still have 45 days from the sale of your relinquished property to identify the replacement property in writing. For an improvement exchange, that identification typically needs to describe the property as it will exist once improvements are substantially complete, not just its current state.
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Because the identified property has to be described with enough specificity, some investors work with their qualified intermediary and architect to draft the identification language well before the 45-day deadline, rather than scrambling in the final days. That is a scheduling and documentation question worth raising early, not a last-minute task.
Financing the construction gap
Exchange proceeds from the sale of your relinquished property typically fund only part of an improvement exchange. Construction costs often exceed available exchange funds, especially on ground-up builds, which means many investors bring in supplemental financing or additional cash.
Topics to review with a lender and tax advisor before signing anything:
- How does supplemental financing interact with the exchange structure, and does the EAT need to be a party to any construction loan?
- If you contribute outside cash to cover a funding gap, how does that affect your basis and any potential boot?
- What are the carrying costs (interest, insurance, property tax) during the period the EAT holds title, and who is responsible for them?
Choosing an exchange accommodation titleholder
Not every qualified intermediary offers improvement exchange services, since the EAT role involves holding title, contracting for or overseeing construction, and managing draws, which is a materially different scope than a standard exchange. Topics to clarify before selecting one:
- What is their track record specifically with improvement exchanges, not just standard or reverse exchanges?
- How do they document construction draws and improvement completion for IRS purposes?
- What are their fees for the extended scope of work, and how do those compare to a standard exchange fee?
Advisor verification resources can help you check credentials and track record before engaging a qualified intermediary or EAT for a structure this specialized.
Related-party and self-dealing considerations
If the improvements are being built by a contractor you are related to, or on land you or a related party already partially owns, additional scrutiny applies. The related-party rules that govern standard exchanges do not disappear just because construction is involved, and layering an improvement structure on top of a related-party transaction adds complexity worth discussing with a tax advisor early, not after the EAT has already taken title.
Exit and cost basis documentation
Once the exchange period closes and the property (finished or not) transfers to you, the improvements become part of your basis calculation alongside the value carried over from the relinquished property. Keeping thorough records, contractor invoices, draw schedules, and the EAT's accounting, matters well beyond the closing date. If you sell this property in a future exchange, your advisors will need a clean paper trail to establish basis and depreciation history.
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Insurance and liability during construction
While the EAT holds title, someone still has to insure the property and manage liability exposure on an active job site. This is a detail that catches investors off guard because it falls outside the scope of a normal exchange conversation. Topics worth clarifying before construction starts:
- Who carries builder's risk insurance during the improvement period, the EAT or the investor, and how is that cost allocated?
- What liability coverage applies if a subcontractor or visitor is injured on the property while the EAT technically holds title?
- How are property tax assessments handled during a period when title sits with an accommodation entity rather than the eventual owner?
These are not exotic risks. They are ordinary construction-site questions that happen to intersect with an unusual title arrangement, and getting clear answers in writing before the EAT takes title avoids disputes later.
Tax reporting timing
An improvement exchange spans at least one, and sometimes two, tax years depending on when the relinquished property sold and when the 180-day period closes. That timing affects when and how the exchange gets reported on Form 8824, and it can affect estimated tax planning if the exchange period straddles a year-end. Topics to review with a tax advisor well before filing season:
- Does the exchange period cross a calendar year-end, and if so, how does that affect the filing deadline for the return covering the relinquished property sale?
- What documentation from the EAT will the tax preparer need to substantiate the improvement costs that count toward exchange value?
- If the exchange fails to fully qualify because of incomplete construction, how would that affect the current year's estimated tax obligations?
Coordinating your advisor team
An improvement exchange typically involves more moving parts than a standard exchange: a qualified intermediary or EAT, a tax advisor, potentially a real estate attorney, a general contractor, and a lender if supplemental financing is involved. Topics worth setting expectations on before the relinquished property even sells:
- Who is the point of contact for construction draws and how quickly can approvals happen?
- How will the team communicate if the timeline slips?
- What is the fallback plan if the property cannot be substantially completed within the exchange period?
Questions to ask an advisor before engaging a team for a transaction this involved can help you compare how different advisors and intermediaries handle scheduling, documentation, and worst-case scenarios.
A narrower alternative: DSTs with built-in improvements
For investors who want 1031 exposure to real estate without managing a construction timeline directly, a Delaware Statutory Trust that already owns a stabilized or recently improved property is worth discussing as an alternative. It removes the construction and EAT coordination entirely, though it comes with its own due diligence questions around sponsor track record and trust structure.
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The 1031 & DST advisor matching resource on Capivise can help connect you with professionals who specialize in comparing improvement exchanges against DST and other replacement property structures, so you can weigh the tradeoffs with someone who has seen both paths play out.
Where to learn more
The IRS outlines the general exchange framework in Publication 544, and Revenue Procedure 2000-37 (the safe harbor for parking arrangements used in both reverse and improvement exchanges) is available through the IRS guidance library. For a broader look at how exchange accommodation titleholders operate, the Federation of Exchange Accommodators publishes educational material aimed at investors and intermediaries alike. General background on construction cost tracking and draw schedules is also covered well by the Associated General Contractors of America.
The bottom line
Improvement exchanges give you room to reshape a replacement property instead of taking it as-is, but that flexibility runs on the same unforgiving 180-day clock as every other exchange, with the added complexity of construction scheduling, EAT coordination, and basis tracking layered on top. None of this is a reason to avoid the structure. It is a reason to get your advisor team aligned early and to ask specific, documented questions before your relinquished property closes.
If you are weighing an improvement exchange against a more conventional replacement, Capivise's advisor matching tool can help you find professionals experienced with these structures specifically, rather than starting your search from scratch.
