A 1031 exchange, named after Section 1031 of the Internal Revenue Code, lets a real estate investor defer capital gains taxes by reinvesting the proceeds from selling one investment property into another. Instead of paying taxes on the gain at the time of sale, the tax liability carries forward into the replacement property. Many investors use this strategy to grow their portfolios without giving up a large portion of their equity to taxes each time they sell.

There are two strict deadlines that govern every 1031 exchange. The first is the 45-day identification period. Starting from the day you close on the sale of your relinquished property, you have exactly 45 calendar days to identify potential replacement properties in writing. Miss this deadline and the exchange fails. Most investors identify up to three properties to give themselves options in case one falls through.

The second deadline is the 180-day exchange period. You must close on your replacement property within 180 calendar days of selling the original property. This deadline runs concurrently with the 45-day period, so in practice you have 180 days total from the sale to complete the purchase. These timelines do not get extended for weekends, holidays, or other circumstances. If day 180 falls on a Sunday, you close on Friday.

You cannot handle the proceeds yourself. The IRS requires that a qualified intermediary hold the funds between the sale and the purchase. The intermediary is a neutral third party who receives the proceeds from your sale and then uses them to acquire the replacement property on your behalf. If the money touches your hands or your bank account, even briefly, the exchange is disqualified. Working with a fractional CFO for real estate who understands the process helps ensure nothing falls through the cracks during the exchange timeline.

A 1031 exchange applies to real property held for investment or for use in a trade or business. Rental properties, commercial buildings, and land all qualify. Your primary residence does not. Vacation homes you also rent out are a gray area that depends on how much personal use they see. The replacement property must also be held for investment or business use, though it does not need to be the same type of property. You can exchange an apartment building for a retail center if you want.

The accounting around a 1031 exchange needs to tie into your broader tax advisory and planning strategy. The deferred gain carries forward and affects your basis in the replacement property, which impacts depreciation and future tax calculations. Getting this right from the start ensures the numbers stay clean and the full tax deferral is captured correctly.