In an improvement or build-to-suit 1031 exchange, your qualified intermediary can hold your exchange proceeds and pay contractors directly for improvements, additions, or construction on your replacement property. The value of that work counts toward your exchange, but timing slips and cost overruns can wreck it if you aren't careful.
In an ordinary 1031 exchange, you sell one property and buy another that already exists. An improvement exchange, also called a build-to-suit or construction exchange, lets you buy the property and build on it instead. You use your exchange proceeds to fund the construction or renovation, and you defer capital gains on both the purchase price and the improvement costs. It works because a third party, the Exchange Accommodation Titleholder (EAT), holds title to the replacement property while the work gets done, under the IRS safe harbor - the set of rules that, followed correctly, keeps the exchange valid.
How the structure works
In a standard delayed exchange, you take title to a finished property. In an improvement exchange, the EAT takes title first. Your exchange funds pay for improvements through a construction draw process, with your qualified intermediary (QI) - the neutral party holding your proceeds - releasing money in stages as work is completed. You take final title only after the improvements are substantially complete. All of it happens within 180 days.
The purchase price and the improvement value are separate pieces, and both count toward the total exchange value used to figure your boot - the value that doesn't get reinvested into the replacement property and stays taxable. The catch is timing: the improvements have to be finished before you take title.
180-day execution timeline
The 180-day deadline is absolute. It doesn't stretch for construction delays, bad weather, or a failed inspection.
Phase | Days | Activity |
|---|---|---|
Pre-acquisition | 1-30 | Permitting, final drawings, contractor selection. Identify replacement property. |
Acquisition | 30-45 | EAT closes on replacement property. Construction contract signed. |
Construction | 45-140 | Improvements in progress. Weekly milestone reviews. QI releases funds via construction draws. |
Final phase | 140-160 | Punch-list completion, final inspections, approval. |
Buffer | 160-180 | Reserve for delays. Title transfer to you upon substantial completion. |
The practical targets sit well inside that window: close on the property by Day 45, reach substantial completion by Day 150, and hold the last 30 days as buffer. Construction schedules slip. Without that cushion, a delay past Day 180 ends the exchange.
Boot calculation with improvements
Improvements count dollar-for-dollar toward your exchange value, right alongside the purchase price. Say you sold a property for $600,000, buy land for $400,000, and improve it for $200,000. Total investment: $600,000, and zero boot.
The danger is a cost overrun. If your contractor estimated $200,000 and the actual cost comes to $250,000, that extra $50,000 has to come from somewhere: your personal funds, which reduces your return; more exchange proceeds, which can create boot if there isn't enough to cover it; or a reduced scope, which can leave the replacement property below the value you were aiming for. All three are problems, which is why people build fixed-price contracts and a 10-15% contingency into the improvement budget.
What qualifies as an improvement
Generally qualifies (capital) | Generally does not qualify (repair/maintenance) |
|---|---|
Adding square footage | Replacing existing systems in kind |
New structural systems (roof, foundation, HVAC, electrical, plumbing) | Cosmetic updates (paint, flooring, fixtures) |
Zoning changes or use modifications | Appliances and personal property |
Exterior improvements (parking, landscaping, site prep) | Furniture, equipment, tools |
Major systems replacements | Ordinary repairs to extend asset life |
Interior finishing in new space |
|
The gray areas - rehabilitation versus repair, a system upgrade versus a straight replacement, interior finishes - come down to professional judgment. A written agreement from your CPA and QI on which improvements count toward exchange value, settled before construction begins, takes the guesswork out later.
Execution risks
Contractor delays carry the sharpest teeth, because the 180-day clock doesn't care why the work ran late. The usual defenses: explicit contractual deadlines and penalty clauses, a contractor experienced with time-critical projects, weekly milestone meetings, and 30-plus days of schedule buffer.
Scope creep kills timelines. Locking the scope down completely before construction starts, and routing every change order through the QI so it preserves both the timeline and the budget, keeps it contained.
Cost overruns are quieter. The standard guards are a fixed-price contract with a guaranteed maximum price (GMP), a detailed site investigation before the scope is final, and a 10-15% contingency in the budget.
When an improvement exchange fits, and when a standard one does
An improvement exchange tends to fit when:
- you've identified land that suits your investment strategy
- you need a custom-built or substantially renovated property
- raw land is cheaper than finished property and you have construction-management experience
- the property's highest and best use requires development
A standard delayed exchange tends to fit when:
- you want to minimize complexity and execution risk
- finished property that meets your needs is available
- you don't have development or construction-management experience
- you want rental income right after closing
Working with your QI and EAT
Your QI does more in an improvement exchange than in a standard one. The typical safe-harbor structure runs like this:
- An EAT holds title to the replacement property during construction.
- Exchange funds are disbursed for improvements through construction draws.
- The QI or EAT verifies the improvements are complete before you take title.
- Improvement costs and timeline are documented to meet exchange requirements.
Many QIs charge $1,000-$3,000 more for an improvement exchange than for a standard one, and some decline to handle them at all. Ask your QI directly whether they handle improvement exchanges and what documentation they require.
Pre-construction checklist
Before starting an improvement exchange:
Executed with discipline, a build-to-suit exchange gives you the exact property you need while deferring the capital gains tax. Executed without enough planning, it becomes a missed deadline and a boot problem.
Improvement exchanges are a strong tool for acquiring raw land and building to suit your investment needs, but execution is unforgiving. Missing the 180-day deadline, spending past your exchange proceeds, or losing control of contractors can leave you with boot or lost 1031 treatment. Work with a QI and legal team experienced in construction exchanges before you start.
Frequently asked questions
Can my qualified intermediary pay for improvements directly to my contractor?
Yes. Your QI can pay contractors directly for agreed-upon improvements, which is one of the main advantages of an improvement exchange. The QI stays in legal control of the improvement funds until the work is complete, which helps satisfy IRS requirements.
Do improvements completed after I take title count toward my exchange value?
Generally no. Most improvement exchanges require the work to be completed, or substantially completed, before you take formal title, or within a specific timeframe defined in your exchange agreement. Improvements made after closing typically don't count toward exchange value and can create boot.
What happens if my contractor delays the project past 180 days?
This is a serious problem. Your 180-day deadline covers the improvements, not just the property purchase. If the replacement property is acquired but the work isn't finished by day 180, you may have taken title to property that hasn't reached the required exchange value, which creates boot. Building a 30-40 day safety margin into the contractor timeline is the common protection.
How is the value of improvements calculated for 1031 purposes?
The improvement value is the cost of the work, labor and materials. If a replacement property is acquired for $400K and you spend $100K on improvements, the total exchange value is $400K + $100K. That combined value has to equal or exceed your relinquished property's sale price, plus exchange costs, to avoid boot.
What improvements count toward the exchange vs. which ones don't?
Capital improvements - structural additions, permanent systems, zoning changes, building additions - typically count. Ordinary repairs, in-kind replacements of existing systems, cosmetic updates, and personal property typically don't. Your QI and CPA should agree on the treatment before you start work.