Most investors treat a 1031 exchange like free money. It is not. It is a tax deferral with strict deadlines, real costs, and a clock that starts the day you close. This 1031 exchange calculator shows you the actual tax deferred, the boot exposure if your replacement property falls short, and the depreciation recapture that follows the new property like a shadow. Run the numbers before you commit to a timeline that leaves zero margin for error.
The two deadlines that make or break the exchange
Section 1031 gives you two windows. Miss either one and the exchange dies. There is no appeal process, no hardship exception, and no workaround.
- 45-day identification period. From the day your relinquished property closes, you have exactly 45 calendar days to identify replacement properties in writing to your qualified intermediary. You can identify up to three properties regardless of value (the three-property rule), or more than three if their combined value does not exceed 200% of the sold property (the 200% rule). Most investors identify two or three and close on one.
- 180-day closing deadline.You must close on at least one identified replacement property within 180 calendar days of the original sale. Not 180 business days. Calendar days. If you sell on January 15, your identification deadline is March 1 and your closing deadline is July 14. A seller dragging their feet on the replacement property is your problem, not the IRS's.
In practice, the 45-day window is the pressure point. An investor in San Diego selling a $700,000 duplex has six weeks to find, vet, and formally identify the next deal. In a competitive market, that means you start looking before the sale closes. The 180-day window rarely becomes the bottleneck unless the replacement seller stalls or financing falls apart.
Boot: the tax bill inside a "tax-free" exchange
A 1031 exchange is only fully tax-deferred if you reinvest everything. Any value you pull out of the exchange is called boot, and boot is taxable. There are two types:
- Cash boot. Sale proceeds that go to you instead of the replacement property. If you sell for $500,000, your closing costs and mortgage payoff total $330,000, and you deposit $170,000 with the QI but keep $10,000 for yourself, that $10,000 is cash boot and gets taxed as a capital gain.
- Mortgage boot. This catches people off guard. If you had a $300,000 mortgage on the relinquished property and only take a $250,000 mortgage on the replacement, the $50,000 difference is mortgage boot. You are receiving debt relief, and the IRS treats it like income. To avoid mortgage boot, take on equal or greater debt on the replacement property.
The simplest way to avoid all boot: reinvest 100% of the net proceeds and buy a replacement property at equal or higher value with equal or higher debt. An investor in Atlanta selling a $450,000 rental with a $270,000 mortgage needs a replacement priced at $450,000+ with at least $270,000 in new financing. Anything less creates boot, and boot creates a tax bill.
Depreciation recapture: the 25% tax that never disappears
Every dollar of depreciation you claimed on the relinquished property follows the exchange. When you eventually sell without exchanging, the IRS recaptures that depreciation at 25%, regardless of your ordinary income bracket.
On a property with $60,000 in accumulated depreciation, that is $15,000 in recapture tax waiting in the wings. A 1031 exchange does not erase it. It pushes it forward onto the replacement property's basis. Your new property starts with a lower adjusted basis, which means higher future gain when you sell.
The only way to truly eliminate depreciation recapture is to hold until death. Your heirs inherit the property at its stepped-up fair market value, and the accumulated depreciation vanishes. For an investor in their 60s with $200,000 in deferred recapture across three exchanged properties, the step-up at death saves $50,000 in taxes that would otherwise come due.
The full capital gains tax picture
The tax deferred in a 1031 exchange is not just the federal capital gains rate. It is a stack of taxes that adds up faster than most investors expect:
- Federal long-term capital gains: 0%, 15%, or 20% depending on income. Most real estate investors fall in the 15% bracket ($47,026 to $518,900 for single filers, 2024 thresholds). High earners hit 20%.
- Net Investment Income Tax (NIIT): 3.8% surtax on investment income for individuals with modified AGI above $200,000 ($250,000 married filing jointly). This applies on top of the capital gains rate, so the effective federal rate for a high-income investor is 23.8%.
- Depreciation recapture: 25% on all depreciation previously claimed, separate from the capital gains rate.
- State capital gains tax: Varies from 0% (Texas, Florida, Nevada, Wyoming, Tennessee, South Dakota) to 13.3% (California). An investor selling a $700,000 rental in Los Angeles with $200,000 in gain owes roughly $26,600 to the state alone.
Like-kind: broader than you think
"Like-kind" does not mean same type. Under Section 1031, any US real property held for investment or business use qualifies as like-kind for any other US real property held for investment or business use. The categories are deliberately broad:
- A single-family rental in Denver can exchange into raw land in Montana.
- A strip mall in Houston can exchange into an apartment complex in Philadelphia.
- A warehouse in Phoenix can exchange into a vacation rental in Maui (as long as it is rented, not personal use).
- Vacant land in Jacksonville can exchange into an office building in Chicago.
The restriction is on property type and location, not property class. The property must be real (not personal property, not stocks, not partnership interests). It must be in the United States (foreign property does not qualify). And it must be held for investment or productive use in a trade or business, not for personal use or immediate resale. A fix-and-flip held for four months is dealer property, not investment property, and does not qualify.
Qualified intermediary: the gatekeeper you cannot skip
You cannot touch the sale proceeds. The moment money from the relinquished property hits your bank account, the exchange is dead. A qualified intermediary (QI) holds the funds between the sale and the replacement purchase. The QI is not optional, and it cannot be your agent, attorney, accountant, or anyone who has acted as your agent in the prior two years.
QI fees run $750 to $1,500 for a standard forward exchange. The QI should carry a fidelity bond and errors-and-omissions insurance. Ask about their segregated account policy: your exchange funds should sit in a separate, FDIC-insured account, not commingled with other clients' money. A few high-profile QI bankruptcies (LandAmerica in 2008 being the most notable) wiped out exchange funds because accounts were not segregated.
The QI also earns interest on your parked funds. On a $400,000 exchange held for 120 days at 4%, that is roughly $5,300 in interest. Some QIs pass a portion back to you, others keep it. Ask upfront.
Reverse 1031 exchanges
A standard 1031 is sell first, buy second. A reverse exchange flips the order: you buy the replacement property before selling the relinquished one. This is useful when you find the perfect replacement property and cannot afford to lose it while waiting for your current property to sell.
The mechanics are more complex. An Exchange Accommodation Titleholder (EAT), usually set up by your QI, takes title to the replacement property. You have 45 days to identify the relinquished property (in this case, the one you plan to sell) and 180 days to complete the sale. The EAT holds the parked property until the exchange closes.
Reverse exchanges cost significantly more: $3,000 to $6,000 in QI and EAT fees, plus legal costs for the parking arrangement. In a market like Austin where a desirable fourplex might receive multiple offers within a week, the extra cost buys you certainty. In a market like Cleveland where inventory sits for months, the premium is hard to justify.
Worked example: $500K sale into $600K replacement
Here is a concrete scenario. An investor in Portland, Oregon sells a rental property:
| Item | Amount |
|---|---|
| Sale price | $500,000 |
| Original cost basis | $320,000 |
| Depreciation claimed | $60,000 |
| Adjusted basis ($320K - $60K) | $260,000 |
| Selling costs (commissions, closing) | $30,000 |
| Amount realized ($500K - $30K) | $470,000 |
| Total gain ($470K - $260K) | $210,000 |
Tax without a 1031 exchange
| Tax component | Calculation | Amount |
|---|---|---|
| Capital gains (gain minus recapture) | $150,000 × 15% | $22,500 |
| Depreciation recapture | $60,000 × 25% | $15,000 |
| NIIT (assuming AGI above threshold) | $210,000 × 3.8% | $7,980 |
| Oregon state tax | $210,000 × 9.9% | $20,790 |
| Total tax owed: $66,270 | ||
With the 1031 exchange into a $600,000 replacement
The investor buys a $600,000 property with a 75% loan ($450,000 mortgage). The replacement price exceeds the sale price. The new mortgage exceeds the old payoff. All net proceeds go through the QI. Result: zero boot, full deferral. The entire $66,270 tax bill rolls forward.
The replacement property's starting basis is $260,000 (carryover adjusted basis) plus $100,000 (the additional capital invested above the relinquished property), giving a depreciable basis on the new building that reflects both the deferred gain and the new money. The depreciation calculator can model the new annual deduction from there.
State tax traps: not every state conforms
Most states follow federal 1031 rules, but several do not, or add their own conditions:
- Californiarequires you to file Form 3840 every year to track deferred gain on property exchanged out of state. Sell a California rental and exchange into a Texas property, and California still wants its cut when you eventually sell the Texas property. The state "follows" the gain.
- Oregon conforms to federal 1031 rules, but with its 9.9% top rate, the deferred state tax alone on a $200,000 gain is $19,800.
- Massachusetts conforms but imposes a 12% short-term capital gains rate on property held less than a year. For 1031 purposes this rarely matters since you need investment intent, but be aware if the holding period is borderline.
- Washington enacted a 7% capital gains tax on gains exceeding $250,000 in 2022. Many investors still assume Washington is a zero-tax state. If you sell a rental in Seattle with $300,000 in gain, the state takes $3,500 on the amount above the threshold. A 1031 exchange defers this alongside federal tax.
An investor selling in a high-tax state and exchanging into a no-income-tax state (Florida, Texas, Nevada) still owes the origin state's tax on the deferred gain in most cases. California is the most aggressive about enforcing this, but New York, New Jersey, and Connecticut have similar clawback mechanisms. Check your state's conformity before assuming the exchange covers everything.
When NOT to do a 1031 exchange
A 1031 exchange is a powerful tool, but it is not always the right one. Here are situations where paying the tax outright makes more sense:
- Small gains. If your total tax liability on the sale is under $30,000 to $50,000, the QI fees ($750 to $1,500), the compressed timeline, and the risk of missing the 45-day deadline may not justify the deferral. A $25,000 tax bill paid now is often better than a panicked purchase made under a 6-week clock.
- You need the cash. A 1031 locks up all your equity in the next property. If you need liquidity for another investment, a business opportunity, or simply to diversify out of real estate, forcing an exchange to avoid tax is the tail wagging the dog.
- Step-up at death. If you are 65 or older and plan to hold real estate until death, your heirs receive a stepped-up basis equal to fair market value at the date of death. All deferred capital gains and depreciation recapture disappear. An investor with $500,000 in cumulative deferred gains across multiple exchanges could save their heirs over $150,000 in taxes through the step-up.
- Forced into a bad deal. The 45-day deadline creates urgency. Urgency leads to overpaying. If the only properties available within your timeline are overpriced or in markets you do not understand, take the tax hit. A $40,000 tax bill is cheaper than a $80,000 mistake on a property you bought because you were running out of time.
Combining 1031 exchanges with other strategies
A 1031 exchange does not exist in isolation. It connects to other parts of your investment math:
- Cap rate on the replacement property determines whether you are exchanging into a better or worse yield. Trading a 7% cap in Memphis for a 4% cap in San Francisco defers the tax but sacrifices income. Run the cap rate on both properties before committing.
- ROI analysis of the replacement property should factor in the lower cost basis you inherit. Your cash-on-cash looks great because you put less new money in, but the total return picture includes the deferred gain sitting on the books.
- Cash-on-cash return on the new deal gets a boost because the exchange lets you deploy more equity into the replacement property instead of sending it to the IRS. On a $600,000 replacement where you would have lost $66,000 to taxes, that is $66,000 more working capital generating returns.
- Depreciation on the replacement property starts from the carryover basis, not the new purchase price. This means your annual depreciation deduction may be smaller than expected. Model it before assuming the new property offers the same tax shelter as buying fresh.
Running the 1031 exchange calculator
Enter your sale price, original cost basis, and depreciation claimed on the relinquished property. Add selling costs (commissions, title, closing fees). Then enter the replacement property price and your planned loan percentage. The calculator shows you the total tax you would owe without an exchange, the amount deferred, and any boot tax triggered by the replacement falling short. Adjust the federal capital gains rate and state rate to match your tax bracket. Most investors in the 15% federal bracket with a mid-range state rate are deferring 25% to 35% of their total gain in combined taxes.
Frequently asked questions
How does a 1031 exchange calculator work?
A 1031 exchange calculator takes your sale price, original cost basis, accumulated depreciation, and replacement property details, then computes the capital gains tax and depreciation recapture you would owe without an exchange. It compares that to the tax due after the exchange, factoring in any boot received. The difference is your deferred tax. If you swap a $500,000 property into a $600,000 replacement with no boot, the full tax bill rolls forward.
What is boot in a 1031 exchange and how do I avoid it?
Boot is any non-like-kind value you receive during the exchange. Cash boot happens when you pocket sale proceeds instead of rolling them into the replacement. Mortgage boot occurs when your new loan is smaller than the old one. To avoid boot entirely, reinvest all net proceeds and take on equal or greater debt. On a $500,000 sale with a $300,000 mortgage payoff, you need at least $300,000 in new debt and must reinvest the full $200,000 equity.
What are the deadlines for a 1031 exchange?
You have 45 calendar days from the sale closing to identify up to three replacement properties in writing (the identification period). You then have 180 calendar days from closing to complete the purchase of at least one identified property. These deadlines are hard. No extensions, no exceptions, no matter the reason. If day 45 lands on a Sunday, it is still day 45. Miss either deadline and the entire exchange fails, and you owe taxes immediately.
How much does a qualified intermediary cost?
Qualified intermediary fees run $750 to $1,500 for a standard forward exchange. Reverse exchanges cost $3,000 to $6,000 because the QI must hold title to the parked property through an exchange accommodation titleholder (EAT). Some QIs also charge $300 to $500 per additional property identified beyond the first. Compare at least two QIs and confirm they carry fidelity bond and errors-and-omissions insurance. The cheapest option is not always the safest.
Can I do a 1031 exchange on my primary residence?
No. Section 1031 applies only to property held for investment or business use. Your primary residence does not qualify. If you converted a rental into your primary home, you might combine a 1031 with the Section 121 exclusion ($250K single, $500K married), but the rules are strict: you must have owned and used it as your primary residence for two of the last five years. Talk to a tax advisor before attempting this combination.
What happens to depreciation in a 1031 exchange?
Depreciation recapture does not disappear. It gets deferred. Your new property inherits the old property's adjusted basis plus any additional capital you invested. If your relinquished property had an adjusted basis of $260,000 and you bought a $600,000 replacement, your depreciable basis on the new property starts at $260,000 plus whatever new money you added. The remaining $340,000 of value is the deferred gain riding along. When you eventually sell without exchanging, the recapture comes due at 25%.
Is a reverse 1031 exchange worth the extra cost?
A reverse exchange lets you buy the replacement property before selling the relinquished one. This eliminates timing risk: you lock in the property you want without racing the 45-day clock. The cost is $3,000 to $6,000 in QI fees, plus the EAT structure adds legal complexity. In hot markets like Austin, Phoenix, or Boise where good deals close in days, paying the premium beats losing a target property. In slower markets, a standard forward exchange works fine.
When should I skip a 1031 exchange and just pay the tax?
Skip the exchange when the gain is small (under $50,000 in deferred tax is often not worth the $750 to $1,500 QI cost and timeline pressure). Skip it if you need the cash elsewhere. Skip it if you are over 65 and planning to hold until death, because your heirs get a stepped-up basis that erases the gain entirely. A $400,000 deferred gain evaporating at death through step-up beats rolling into a property you do not want.