A Section 1031 Exchange defers the 3.8% Net Investment Income Tax right alongside your regular capital gains tax — because gain you never recognize isn’t investment income yet, and the surtax has nothing to attach to. The moment you take boot, that calculation changes.
What the Tax Is
The Net Investment Income Tax is an extra federal layer of 3.8%, added by the Affordable Care Act — sometimes called the “Obamacare tax.” It applies only above specific income thresholds: single filers with more than $200,000 in annual income, and married couples filing jointly with more than $250,000. If your income sits below those lines, this tax doesn’t touch you regardless of what you sell or exchange.
For those above the thresholds, it reaches net investment income — and capital gains from the sale of investment real estate fall squarely within that definition.
How the Exchange Keeps It Deferred
A clean 1031 Exchange produces no recognized gain. You sell the Relinquished Property, the proceeds move to a Qualified Intermediary, and you acquire Replacement Property of equal or greater value. Because the gain is deferred rather than recognized, it isn’t investment income yet. There is nothing for the 3.8% to attach to.
This works in exactly the same way that the exchange defers your regular capital gains tax and depreciation recapture — the mechanics are the same. The surtax follows the gain. Defer the gain, and you defer the surtax along with it.
Where Boot Changes the Picture
Boot is where the 3.8% reappears. Boot is anything you receive in the exchange that isn’t like-kind real property — cash left over, debt relief, or personal property pulled out of the deal. All of it is taxable up to your gain, and that recognized gain can carry the 3.8% on top of the regular tax.
Say you’re a joint filer well above the $250,000 threshold. You sell a duplex, net $100,000 in cash boot, and your recognized gain equals that $100,000. The regular federal capital gains rate applies — and then the 3.8% stacks on top of it. The surtax doesn’t replace your ordinary tax; it adds to it.
This is why boot deserves careful attention from higher-earning Exchangors. It isn’t just a matter of “a little cash back.” Every dollar of recognized boot is a dollar exposed to two separate federal taxes simultaneously.
Depreciation Recapture Carries the Same Risk
The 3.8% doesn’t distinguish between capital gain and depreciation recapture when both are recognized. If you take boot and a portion of your recognized gain is attributable to depreciation you claimed on the building — taxed at a maximum of 25% under the Section 1250 recapture rules — the 3.8% layers on top of that as well. On personal property recapture, taxed as ordinary income at up to 37%, the same principle applies to any portion that is recognized rather than deferred.
A full exchange defers all of it: the capital gain, the depreciation recapture, and the 3.8% surtax. Recognized gain, however it is characterized, is the opening the surtax needs.
The Practical Takeaway
If your income is above the thresholds, your actual federal tax cost on any recognized gain will run 3.8% higher than a standard capital gains calculation shows. A clean exchange eliminates that exposure entirely for the duration of the exchange — keep exchanging, and at death your heirs take the property at stepped-up basis, potentially eliminating the deferred gain altogether. Take boot, and you hand the IRS two bites at the same apple.
The 3.8% is a relatively narrow tax — it only reaches higher earners, and only gain you actually recognize. But for those it reaches, structuring the exchange to minimize or eliminate boot isn’t just about the regular tax. It’s about both taxes at once.