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1031 Improvement Exchange Calculator

Improvement (build-to-suit) exchanges let you defer gain on a smaller replacement property by adding improvements that bring the total value up to the relinquished. This calculator checks whether the combined purchase + improvements clears the replacement value test — and sizes any shortfall that triggers boot.

Relinquished property value

Replacement purchase price

Improvement budget on replacement

EAT hold period (days)

EAT (accommodator) fee

Total replacement value (purchase + improvements)

$2,200,000

Fully deferred

Yes

Shortfall (taxable boot)

Additional improvements needed

EAT fee

$15,000

How the math works

A reverse/improvement exchange uses an Exchange Accommodation Titleholder (EAT) to hold replacement property title while improvements are made. Unlike a standard forward 1031, you can defer gain on a replacement property that needs upgrades — improvement dollars count toward replacement value.

180-day EAT hold limit applies. Improvement value above what's completed by day 180 is boot — taxable. Plan the construction schedule carefully; overruns can trigger partial boot recognition.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This 1031 Improvement Exchange Calculator is built to give a quick, browser-based estimate for 1031 improvement exchange. Improvement (build-to-suit) exchanges let you defer gain on a smaller replacement property by adding improvements that bring the total value up to the relinquished. This calculator checks whether the combined purchase + improvements clears the replacement value test — and sizes any shortfall that triggers boot. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the 1031 improvement exchange result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this 1031 improvement exchange estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter relinquished property value.
Enter replacement purchase price and improvement budget.
Enter EAT hold period (typically 180 days max).
Enter EAT (accommodator) fee.
Read total replacement value and shortfall analysis.

Frequently Asked Questions

How does EAT structure work?

Exchange Accommodation Titleholder (a qualified intermediary) takes title to the replacement property for up to 180 days. You fund the purchase and improvements. At day 180, title transfers to you; any uncompleted improvements become boot.

Parked property vs improvement exchange?

Parked (reverse): EAT holds relinquished property until replacement is closed. Improvement: EAT holds replacement while you build improvements. Both use the same EAT structure but for different purposes.

EAT fees?

Typical: 1-2% of property value, capped. Plus setup legal (~$10K-$20K). Ongoing costs during the 180-day hold. Only viable for deals >$1M in deferred gain.