The 45-Day Rule: Everything You Need to Know

What the 45-day rule actually says

From Day 0 (the day your relinquished property closes), you have 45 calendar days to deliver a written, signed identification of replacement properties to your qualified intermediary. Three things matter:

• Calendar days. Not business days. If Day 45 lands on Sunday, it still expires Sunday at midnight.
• Written. Oral identification doesn't count. Must be on paper, signed, and dated.
• To the QI. Delivering to your agent, attorney, or the title company doesn't count. Must be the QI.

Miss any of these three and the identification is void. You then have no qualifying replacement property and the exchange fails.

Why it trips people up

Three reasons the 45-day rule is harder than it looks:

1. People underestimate how fast 45 days goes. Between due diligence on your replacement, negotiating, and the actual transaction logistics, six weeks disappears. If you're starting from zero (no replacement candidates sourced yet), you're already behind.

2. No extensions. Financing takes too long, inspections come back bad, the deal falls through — none of it extends Day 45. Only a federally-declared disaster declaration can extend the deadline, and only for properties in the affected area.

3. The identification document rules are technical. Properties must be identified unambiguously — by street address, legal description, or other clear identifier. "A property on Main Street" doesn't count. "123 Main Street, Anywhere, TX 75001" does.

The three identification rules

You pick one. Most investors use the first.

3-property rule

Identify up to 3 properties regardless of total value. By far the most common choice. You're not committing to buy all 3 — you're just listing them as possibilities. You can ultimately close on any one (or more, if the purchase is structured that way).

200% rule

Identify any number of properties as long as their combined fair market value is ≤ 200% of the relinquished property's sale price. Useful when you want a longer shortlist — say, 5-6 smaller rentals totaling less than 200% of your sold property.

95% rule

Identify any number of properties of any value, but close on properties representing ≥ 95% of the total identified value. Rarely used because the closing requirement is brutal — if you identify 5 properties totaling $2M and can only close on $1.8M of them, the whole exchange fails.

How to never miss Day 45

One strategy works. Every other approach involves prayer.

Start sourcing replacement properties before you list your sale. Tour options during the 30-60 days your property is on the market. Get under contract on your top choice before Day 0 if possible. That way, Day 1 you're not scrambling — you're confirming a deal already in motion.

Second-tier strategies:

• Use the 3-property rule with real backups, not just one desired property
• Have your QI's delivery instructions saved and ready on Day 1
• Put Day 45 in your calendar with a 5-day reminder and a 1-day reminder
• Use overnight courier or email with confirmed delivery — don't rely on first-class mail

What happens if you miss it

The exchange is void. Your QI returns the proceeds to you. The sale becomes a standard taxable event and you owe the full capital gains plus depreciation recapture on your tax return that year.

There's no appeal. The IRS does not grant extensions for this deadline outside of federally-declared disaster zones. Even legitimate reasons — your father died, your lender pulled out, you were hospitalized — don't extend Day 45.

If the deadline is approaching and you don't have acceptable replacements identified, you can also choose to partially identify — list the properties you have, even if you're not 100% sure. After Day 45 you can drop or replace with other identified properties; you just can't add new ones.