1031 Identification Rules: The 3-Property, 200% and 95% Rules

The 45-day identification window is the part of a 1031 exchange where good intentions most often turn into taxable mistakes. The IRS limits how many replacement properties you can name and how much they can be worth, through three rules, and it requires the identification to be made a particular way. None of this is difficult, but all of it is unforgiving: an identification that breaks a rule or is made improperly can invalidate the exchange even if every other step is flawless. This memo covers each rule, how to put a valid identification on paper, and how to think strategically about what to name.

The three identification rules at a glance

Within your 45 days, you may identify replacement property under any one of three rules. You only have to satisfy one of them:

These rules sit inside the broader 45-day clock covered in our timeline memo.

The reason there are three rules rather than one is that investors have different needs. Some want a primary target and a couple of backups; some want to assemble a diversified portfolio of many properties; and the rules accommodate both, while the 95% rule exists as a strict backstop for anyone who oversteps the first two.

The three-property rule

The simplest and by far the most-used option lets you identify up to three replacement properties, regardless of their value, and then acquire any one, two, or all three. Its appeal is that it requires no arithmetic — three properties, any prices, done. Most investors use it precisely because it allows a primary target plus one or two backups without any value ceiling to track. Remember that identifying three doesn't obligate you to buy three; it simply preserves options, and naming a backup or two is prudent insurance against a primary deal falling through.

The 200% rule

When three isn't enough — typically because you're spreading proceeds across several smaller properties or building a diversified portfolio — the 200% rule lets you identify any number of properties, as long as their combined fair market value does not exceed 200% of the value of what you sold. Sell a $1,000,000 property and you may identify any number of replacements totaling up to $2,000,000. The discipline this rule demands is watching the aggregate: it's easy to add "just one more" candidate and quietly breach the 200% ceiling, which throws you out of the rule entirely unless you can satisfy the 95% rule instead.

The 95% rule

The 95% rule is an escape valve, not a strategy. If you identify more than three properties and their combined value exceeds 200% of what you sold, your identification is still valid only if you actually acquire at least 95% of the total value you identified. In practice this is hard to rely on: it requires you to close on nearly everything you named, leaving little room for a deal to fall through. Sophisticated investors treat it as a backstop that occasionally saves an over-broad identification, not as a deliberate plan. If you find yourself counting on the 95% rule, it usually means the identification should have been structured differently.

How to write a valid identification

Satisfying a rule isn't enough; the identification itself must be done correctly, or it fails on form:

• In writing and signed by you, the taxpayer.
• Delivered by midnight on Day 45 to your qualified intermediary or another party to the exchange — not to your own agent, attorney, or a relative, who don't count for this purpose.
• Unambiguous. Each property must be described clearly enough that there's no doubt what was identified — typically a street address or legal description, not "a property in Dallas."

One useful nuance is the incidental property rule: property that is incidental to a larger property and worth no more than 15% of that property's value — appliances, furnishings, or equipment that come with a building, for example — generally does not have to be separately identified. It travels with the main asset. That keeps you from having to itemize every refrigerator in an apartment building you've named.

Revoking and changing an identification

You are not locked into your first draft. You can revoke and re-identify as many times as you like, in writing, up until the 45-day deadline. After midnight on Day 45, however, the identification freezes — whatever stands at that moment is what you must work with for the remainder of the exchange. The practical advice is to treat the deadline as real and finalize a day or two early rather than amending at the last minute, when a delivery failure or a misdescription has no time left to be corrected.

Strategy: how many properties to identify

The rules are mechanical; the judgment is in how you use them. For most investors buying a single replacement, the three-property rule with a primary target and one or two genuine backups is the sensible default — it costs nothing to name backups and they can rescue an exchange if the primary deal collapses. A fast-closing Delaware Statutory Trust is a popular backup precisely because it can settle in days. Investors assembling a portfolio lean on the 200% rule but must police the aggregate-value ceiling. And nearly everyone should avoid relying on the 95% rule, which leaves no margin for a deal to fail. The overarching principle: identify with the same care you'd close with, because a sloppy identification can undo an otherwise perfect exchange.

Common identification mistakes

Identification failures are almost always procedural, and almost always avoidable. The recurring ones:

• Vague descriptions. "A retail center in Phoenix" isn't an identification; a street address or legal description is. Ambiguity can void the designation.
• Delivering to the wrong party. The notice must reach your qualified intermediary or another party to the exchange — not your own real estate agent, attorney, or a relative, none of whom count.
• Oral or informal identification. It must be in writing and signed. A phone call, a text, or an unsigned email won't do.
• Breaching the 200% ceiling. Adding "just one more" candidate can tip you over the limit and out of the rule unless you can meet the 95% test.
• Relying on the 95% rule. Counting on acquiring 95% of everything identified leaves no room for a deal to fall through.
• Waiting until Day 45. A last-minute delivery that fails has no time left to fix. Finalize early.

Every one of these is a self-inflicted wound. The defense is a written, signed, unambiguous notice delivered to the right party with days to spare.

Identifying DSTs and fractional interests

Replacement property doesn't have to be a whole building. A fractional interest — a Delaware Statutory Trust interest or a tenant-in-common interest — can be identified and acquired like any other replacement, which is what makes these vehicles such useful backups within the 45-day window. The key is description: you identify a fractional interest by naming the specific offering or trust and the percentage or beneficial interest you intend to acquire, clearly enough to remove ambiguity, rather than by a street address alone.

Because a DST can absorb a precise dollar amount and close in days, many investors name one among their three identified properties specifically as insurance: if a primary deal collapses late in the window, the DST is already identified and can be completed inside the remaining time. It's the cleanest way to keep the 45-day decision from becoming a single point of failure.

Frequently Asked Questions

Glossary

Three-Property Rule

Lets you identify up to three replacement properties of any value.

200% Rule

Lets you identify any number of properties whose combined value is no more than twice the relinquished property's value.

95% Rule

Permits identifying beyond the other limits only if you acquire at least 95% of the total identified value.

Incidental Property Rule

Property incidental to a larger asset and worth no more than 15% of its value need not be separately identified.

Identification Notice

The signed written document naming replacement property, delivered to the qualified intermediary by Day 45.

Disclosures