1031 vs Sell at $300K Gain: When Paying 23.8% Wins

Marcus owns a small apartment building in Phoenix. He bought it for $480,000, took $100,000 of depreciation over the years, and just got a clean offer to sell for $680,000. His adjusted basis is $380,000, so his total gain is $300,000. He files single, and between his W-2 job and this gain his MAGI clears $250,000. His broker is pushing a 1031 exchange — “don’t give the IRS a dime” — but Marcus is tired of being a landlord and wants out of real estate.

The decision is not philosophical. It is arithmetic. If Marcus sells and pays, his federal tax bill is about $66,400, or roughly $86,500 all-in once a typical state layer is added. If he 1031s into a replacement property he plans to flip in three years anyway, he is taking on a $1,200 qualified-intermediary fee, a 45-day identification scramble, and the risk of overpaying in a tight market — to defer a tax he will simply pay in three years. At his holding horizon, selling wins. Below is the math that proves it, and the break-even line where the answer flips.

The $300K gain is not one number — it is three tax layers

The single biggest mistake investors make is treating a rental gain as “capital gains taxed at 15%.” A rental sale is taxed in three distinct layers, and the layers carry very different rates.

1. Unrecaptured §1250 depreciation recapture. The portion of your gain attributable to depreciation you previously claimed is taxed at a flat 25% maximum rate — not the LTCG rate. Marcus took $100,000 of depreciation, so $100,000 of his gain falls here.
2. Long-term capital gain on appreciation. The remaining $200,000 — the true appreciation above his original cost — is taxed at the LTCG rate. For a single filer with taxable income inside $48,351–$533,400, that rate is 15% (IRC §1(h)).
3. Net Investment Income Tax. Under IRC §1411, an additional 3.8% applies to the lesser of net investment income or MAGI over $200,000 (single) / $250,000 (MFJ). Rental gain is net investment income, so the full $300,000 is exposed.

Worked example: Marcus sells and pays

Federal alone is $66,400. Marcus is in Arizona (2.5% flat on the gain), so his all-in bill is about $73,900. Run the same gain in California (top rate 13.3%, which taxes the gain as ordinary income) and the state layer jumps to nearly $40,000 — pushing the all-in number past $105,000. The 2.5%-flat Arizona figure is the current published state rate; substitute your own state’s rate, since most states tax this gain as ordinary income with no preferential bracket.

For the break-even analysis below, the relevant number is the total tax a 1031 would defer — federal plus state. Federal alone is $66,400. Add a mid-tier state layer of roughly $20,100 (about a 6.7% effective rate, between Arizona’s 2.5% flat and California’s 13.3%) and the all-in deferral is about $86,500. That $86,500 is the headline figure for a typical mid-to-high-tax-state investor; a no-income-tax-state seller defers only the $66,400 federal, which shortens the break-even, while a California seller defers over $106,000, which lengthens it.

What the 1031 actually defers

A 1031 exchange under IRC §1031 lets Marcus roll the entire $300,000 gain — including the $100,000 of recapture — into a like-kind replacement property, paying $0 now. The deferred tax of roughly $86,500 stays invested instead of going to the Treasury. That is the whole pitch: tax-free compounding on money you would otherwise hand over.

But a 1031 is not free, and it is not flexible. The rules (IRC §1031; Rev. Proc. 2000-37) are strict:

• 45-day identification. You must formally identify replacement property within 45 days of closing the sale. No extensions.
• 180-day closing. You must close on the replacement within 180 days (or your tax-filing deadline, whichever is earlier).
• Qualified intermediary required. You cannot touch the sale proceeds. A QI holds the funds; touching them blows the exchange. Expect an $800–$1,500 QI fee.
• Real property only. Since TCJA 2017, only real property qualifies — no swapping into equipment, crypto, or a business.
• Equal-or-up rule. To fully defer, you must reinvest all proceeds and replace your debt. Any cash you pocket is taxable boot.

The break-even: when deferral beats paying

A deferred tax is not a forgiven tax — unless you hold until death. So the question is: how long must Marcus hold the replacement property for the compounding on his $86,500 deferral to outrun the cost of doing the exchange?

Think of the 1031 as an interest-free loan from the IRS equal to the deferred tax. The benefit is the after-tax return that $86,500 earns while it stays invested. The cost is the friction: the QI fee, higher transaction costs from buying into a tight market, and the eventual tax when he sells the replacement (assuming no further exchange).

At a 7% after-tax return, the deferred $86,500 throws off about $6,055 of tax-free earnings in year one. The friction of selling — a $1,200 QI fee plus the realistic cost of overpaying 2–3% in a thin replacement market — eats roughly two to three years of that benefit before the exchange pulls ahead. That is why the break-even lands near six years. Marcus, who wants to flip in three, is squarely in “sell and pay” territory.

What most people get wrong: “never pay tax” is a slogan, not a strategy

The most common myth is that a 1031 is always the smart move because “you never want to pay the tax.” That confuses deferral with elimination. A 1031 does not erase the $86,500 — it pushes it onto the basis of the next property. Sell that property without exchanging again, and the full deferred gain comes due, often at a higher rate if you have moved into a higher bracket or NIIT exposure.

Deferral only becomes elimination through one door: death and the §1014 step-up. If your plan is “exchange until I die and let my heirs inherit a stepped-up basis,” the 1031 is extraordinary — you may legitimately never pay a dime. But if your plan is “buy something, hold a few years, sell, and enjoy the money,” you are just renting the deferral and paying friction for the privilege.

The second myth: that depreciation recapture goes away in an exchange. It does not. The $100,000 of recapture rides along inside the deferred gain. The 25% recapture rate is fixed by statute and follows the gain into the replacement property — you are deferring it, not escaping it.

The partial 1031 escape hatch Marcus actually used

Marcus does not have to choose all-or-nothing. A partial 1031 lets him exchange most of the proceeds and pull some cash out. The cash he keeps is “boot,” taxable now — and here is the part that surprises people: boot is taxed against the recapture layer first, at 25%, before any appreciation.

Say Marcus exchanges into a replacement but pulls out $50,000 cash to pay down personal debt. That $50,000 of boot is taxed first as recapture: $50,000 × 25% = $12,500, plus 3.8% NIIT ($1,900), for about $14,400 now. The remaining $250,000 of gain stays deferred. He gets liquidity and partial deferral — a middle path the all-or-nothing framing hides.

The four questions that actually decide this

Forget “is a 1031 good?” Answer these four, in order, and the decision resolves itself.

1. How long will you hold the replacement? Under ~6 years → lean sell. 6+ years → lean 1031. Until death → 1031, no contest.
2. Do you want to stay in real estate at all? If you want out — to diversify into index funds, a business, or cash — a 1031 chains you to like-kind property. Selling buys freedom for ~$86,500.
3. What is your state rate? A no-income-tax state (Texas, Florida, Nevada, Washington) makes selling far cheaper. California or New York makes the deferral far more valuable.
4. Can you find a worthy replacement in 45 days? If the market is thin and you would overpay just to beat the clock, the deferral benefit evaporates against the overpayment.

The decision lever

The lever is your holding horizon on the next property, not the size of the gain. At $300,000, the deferral is large enough to be worth defending — about $86,500 of tax that could keep compounding. But it only beats selling if you will hold the replacement at least six years, or hold until death for the §1014 wipeout. Marcus, who wants to exit real estate inside three years, should sell, pay the $66,400 federal (plus his state layer), and redeploy into something he actually wants to own — a clean, flexible basis with no 45-day clock and no recapture riding shotgun into the next deal. Run your own number against the six-year line: if you cannot honestly commit past it, paying the 23.8% now is the winning move.