A 1031 exchange can let a real estate investor sell one property, buy another, and defer the capital gains tax on the sale. That benefit comes with a strict set of rules. Miss a deadline or handle the money the wrong way, and the whole exchange can fail, leaving you with the tax bill you were trying to defer.

This article walks through the main rules in plain language: timelines, identification limits, the role of the intermediary, how title must be held, and what creates taxable boot. It is general information, so always check your own plan with a tax professional.

Rule 1: Both Properties Must Be Held for Investment or Business Use

The property you sell and the property you buy must both be held for productive use in a trade or business or for investment. Rentals, commercial buildings, and land held for investment usually qualify.

Your primary residence does not. Neither does property you bought mainly to fix up and resell quickly. Those properties are treated as inventory, not investments.

Vacation homes are a gray area. The IRS has a safe harbor for some second homes that are rented out regularly and used personally only a limited number of days. If your property is partly personal, get advice before relying on an exchange.

Rule 2: The Properties Must Be Like-Kind

For real estate, like-kind is broad. Real property in the United States can generally be exchanged for other real property in the United States, regardless of type or quality. Land for a building, a duplex for an office, or a warehouse for a group of rental homes can all qualify.

Since 2018, only real property qualifies. Personal property such as equipment and vehicles cannot be exchanged under Section 1031. Foreign property can only be exchanged for other foreign property.

Rule 3: The 45-Day Identification Period

From the day the sale of your old property closes, you have 45 calendar days to identify possible replacement properties. Weekends and holidays count. There are no extensions for finding the right property.

The identification must be:

In writing
Signed by you
Delivered to the qualified intermediary or another proper party
Specific enough to describe the property, such as a street address or legal description

A property you actually buy within the 45 days is treated as identified.

Rule 4: The 180-Day Exchange Period

You must close on the replacement property within 180 days of the sale, or by the due date of your tax return for that year, including extensions, whichever comes first.

That last part catches people. If you sell late in the year, your return may be due before the 180 days are up. Filing an extension on your return can preserve the full 180 days.

The 45-day and 180-day periods run at the same time. You do not get 45 days plus 180 days.

Rule 5: Identification Limits

To stop investors from identifying every property on the market, the IRS sets limits on how many properties you can name. You must meet one of these three tests:

Three-property rule. You may identify up to three properties of any value. This is the most common approach.

200 percent rule. You may identify any number of properties, as long as their total value does not exceed 200 percent of the value of the property you sold.

95 percent rule. You may identify any number of properties of any total value, but you must then buy at least 95 percent of the total value identified. This rule is rarely used because it is so hard to meet.

Naming backups is smart. Deals fall through, inspections fail, and sellers change their minds.

Rule 6: You Cannot Touch the Money

Between the sale and the purchase, the proceeds must be held by a qualified intermediary. If the money passes through your hands or your bank account, even briefly, the IRS treats it as received, and the exchange fails.

The intermediary cannot be someone who has acted as your agent recently, such as your attorney, accountant, real estate agent, or employee within the past two years, with some limited exceptions. Choose an established intermediary, and ask how client funds are held and protected.

Rule 7: Same Taxpayer on Both Sides

The taxpayer who sells the old property must be the same taxpayer who buys the new one. If you sell as an individual, you generally need to buy as that individual. If an LLC sells, that LLC generally needs to buy.

There are some exceptions. A single-member LLC that is ignored for tax purposes is usually treated as the same taxpayer as its owner. But changing ownership structure in the middle of an exchange is risky. Plan structure changes well before or well after the exchange.

Rule 8: Equal or Greater Value to Defer All Tax

To defer all of the gain, you generally need to:

Buy replacement property of equal or greater value than what you sold
Reinvest all of the net cash proceeds
Take on debt equal to or greater than the debt paid off, or add cash to make up the difference

If you fall short, the difference is boot, and it is taxable.

Rule 9: Understand Boot

Boot is anything you receive in the exchange that is not like-kind property. Common forms include:

Cash boot. Money you take out of the exchange.
Mortgage boot. A reduction in debt that is not offset by new debt or added cash.
Other property. Personal property or other non-qualifying items.

Some closing costs can be paid from exchange funds without creating boot, such as commissions and title fees. Others, such as prorated rents, security deposits, and loan fees, may create boot if handled the wrong way. Review the settlement statement carefully with your adviser.

Rule 10: Watch Related-Party Rules

You can do an exchange with a related party, such as a family member or a company you control, but extra rules apply. In general, both parties must hold the exchanged properties for at least two years. If either sells sooner, the deferred gain can become taxable. Buying replacement property from a related party is especially restricted.

Rule 11: Holding Period Matters

The law does not set a fixed holding period for exchange properties, but intent matters. If you sell soon after buying, or exchange into a property and quickly sell it, the IRS may argue it was not held for investment. Many advisers suggest holding for at least a year or more, though the right answer depends on the facts.

Rule 12: Report It Correctly

Exchanges are reported on IRS Form 8824 for the year the relinquished property was sold. The form shows the properties involved, the dates, and the calculation of any gain recognized and the basis carried to the new property. States may have their own reporting rules as well.

Putting It All Together

The 1031 exchange rules are not hard to understand, but they are unforgiving. Most failed exchanges come from simple mistakes: starting too late, missing a deadline, touching the money, or misunderstanding boot. A short checklist helps:

Talk to a tax adviser and qualified intermediary before listing the property
Put the intermediary agreement in place before closing
Start looking for replacement property early
Identify properties in writing within 45 days, with backups
Close within 180 days, and extend your tax return if needed
Match or exceed the value, equity, and debt of the old property
Keep the same taxpayer on both sides
Review closing statements for boot
Report the exchange on Form 8824

Final Thoughts

A 1031 exchange can be one of the most valuable tax tools a real estate investor has. But the benefit depends entirely on following the rules. Plan early, work with experienced professionals, and treat every deadline as fixed. This article is for general education and is not tax or legal advice.