The 1031 exchange, explained for a Long Island landlord
Sell an investment property, buy another, and the capital gains tax waits. That is the whole idea. The rules around it are strict, the clock is short, and one wrong step at closing ends the deal. This page walks the rules, the calendar, and the mistakes, so you can plan the sale before the sign goes up.
What it is
Section 1031 of the federal tax code lets you sell real property held for business or investment and buy other real property held for business or investment without paying capital gains tax now. The tax is deferred, not forgiven. Your old basis carries into the new property, and the gain comes due when you finally sell for cash. Many investors never do, and the heirs take the property with a stepped up basis.
What qualifies: a rental house, a two family you rent out, a strip center unit, an office, land held for investment. What does not: the home you live in (that one has its own exclusion, on the capital gains page), a house you bought to flip, and property outside the United States. A vacation house can qualify when it has been a real rental: the IRS safe harbor wants it rented at fair rent for at least fourteen days in each of the two years before the sale, with your own use kept under fourteen days or ten percent of the rented days.
The calendar, and why it kills exchanges
Both clocks start the day your sale closes. By day 45 you must identify the replacement property in writing to the intermediary. By day 180 you must close on it, or by the due date of your tax return for that year if that comes first. Weekends and holidays count. There are no extensions unless the IRS grants disaster relief for your area.
On Long Island that is the hard part. Inventory is thin, and a good replacement can take months to find. So the order of work is backwards from what people expect: find the next property first, then list the one you are selling. An investor who lists in May and closes in July has until early September to name the replacement and until January to close on it. One who starts looking on closing day usually ends up overpaying for whatever is available on day 44.
How many can you name
Three properties of any value. Or any number of properties as long as their total value is no more than twice what you sold. Or any number at any value if you end up closing on 95 percent of that total value. Almost everyone uses the three property rule and names a first choice plus two backups.
The money rules
You never touch the proceeds. A qualified intermediary, a company that does this for a living, holds the sale money from your closing until the purchase closing. If the money passes through your account, or your attorney's escrow account, even for a day, the exchange fails and the whole gain is taxed. The intermediary is hired before the sale closes, not after.
Buy equal or up. To defer all of the gain, the replacement must cost at least as much as what you sold, and you must put all of the equity back in and replace the mortgage you paid off with equal or greater debt or fresh cash. Buy cheaper, or take cash out, and the difference is called boot and is taxed that year.
Depreciation rides along. The depreciation you took on the old property would normally be taxed at sale. In an exchange it defers too. That is often the bigger number for a landlord who has owned a Long Island rental for twenty years.
New York follows. New York State honors the federal deferral for state income tax. A seller who lives outside New York files the nonresident estimated tax form at closing and claims the exchange on it. Your CPA handles the forms; the federal return reports the exchange on Form 8824.
Where it breaks
- Closing without the intermediary in place. The most common failure. Once your attorney has the check, there is no exchange.
- Missing day 45. A verbal pick does not count. The identification is a signed writing with the address, delivered to the intermediary.
- Buying in a different name. The same taxpayer that sold must buy. Selling in your name and buying in your LLC breaks it; ask the CPA first.
- Naming a property you cannot actually close. A backup you never inspected is not a backup.
- Moving in. The replacement must be held for investment. Turning it into your home right away invites the IRS to unwind the exchange; the safe harbor wants two years of real rental use first.
- Counting on an extension. There is none.
The reverse exchange
If the perfect replacement shows up before your sale, a reverse exchange lets an exchange company take title to the new property and hold it until your old one sells, inside the same 180 days. It costs more and needs cash or a lender comfortable with the structure, but on Long Island it is often the only way to land the right building in time.
Who does what
Your CPA decides whether the exchange makes sense against simply paying the tax, and runs the boot math. Your attorney writes the exchange language into both contracts. The qualified intermediary holds the money and the paperwork. Muds finds the replacement, which in practice means the buy box: the asset type, towns, price, and return you need, so the search starts before the sale and not on day one of the clock. Muds is not a CPA, an attorney, or an intermediary, and earns nothing from any of them.
Common questions
Can I do a 1031 exchange on the house I live in
No. Section 1031 is for property held for business or investment. A primary home uses the Section 121 exclusion instead, $250,000 of gain for a single owner and $500,000 for a married couple. A home that was a rental for years and then your residence can sometimes use both; that is a CPA conversation.
Do the 45 and 180 days run at the same time
Yes. Both start on the day your sale closes. Day 180 is 180 days after closing, not 180 days after you identify. Weekends and holidays count, and there are no extensions outside IRS disaster relief.
Can I exchange a Long Island rental for property in another state
Yes. Any real property in the United States held for investment is like kind to any other. A two family in Suffolk can become a warehouse in Florida. Property outside the United States is not like kind to property inside it.
What if I take some cash out
The cash you keep, and any mortgage you pay off without replacing, is called boot and is taxed in the year of the sale. The rest of the gain still defers. Partial exchanges are allowed; they are just partly taxed.
Does New York State tax the exchange
New York follows the federal rule, so the state tax defers with the federal tax. A seller who is not a New York resident files the state's nonresident form at closing and claims the exchange on that form rather than paying the estimated tax.
Where this comes from, and what it is not
Internal Revenue Code Section 1031 and its regulations, IRS Form 8824 and its instructions, IRS Revenue Procedure 2008-16 (the vacation home safe harbor) and 2000-37 (reverse exchanges), and the New York State nonresident real property estimated tax rules, read October 2026. Tax law changes and your facts decide the answer. This page is not tax or legal advice. Your CPA, your attorney, and a qualified intermediary run the exchange; Muds runs the search.