Capital Gains Tax: What You Keep on a $5M Jupiter Home
On a simplified $5 million Jupiter waterfront sale, the federal tax in the example is about $785,400. The number that matters is what you keep after basis, the home sale exclusion, and tax.
If you have owned waterfront in Jupiter or Tequesta for a long time, the number that should shape your next move is not the list price. It is what you actually keep after selling expenses, adjusted basis, the primary residence exclusion, and federal capital gains tax.
I walked through a simplified $5 million Jupiter waterfront sale for a longtime owner. Under the assumptions in that example, the estimated federal tax is about $785,400. That is not a prediction for your house. It is a reminder that a big sale price and a big check at closing are not the same thing.
This is educational, not tax advice. I am a real estate broker, not a CPA. Your CPA owns the final number. My job is to get you a realistic sale range and estimated selling costs so that conversation is based on your property, not a headline.
The exclusion most owners remember, and the part they forget
The IRS lets qualifying owners exclude gain on the sale of a main home. The cap is $250,000 if you file as an individual and $500,000 if you are married filing jointly. You generally need to have owned the home and used it as your main home for at least two of the five years ending on the sale date, and you generally cannot have used the exclusion on another home in the two years before this sale. Those rules live in IRS Topic 701.
On a typical Jupiter starter home that exclusion can wipe out the entire gain. On a long held waterfront house that traded for well under a million years ago, $500,000 is a meaningful shield and still leaves a large taxable remainder.
Florida does not add a state income tax on top of that federal bill. That is why the federal calculation is the one that actually moves the net.
How a $5 million sale turns into a $785,400 tax estimate
The example in the video stacks four layers. Selling expenses come off first, because you do not pay tax on the commission and closing costs you never receive. Then you subtract adjusted basis, which starts with what you paid and rises with properly supported capital improvements. Then you subtract the Section 121 exclusion if you qualify. What is left is the taxable gain.
On a high income waterfront sale, that remainder is usually taxed as long term capital gain at 20 percent, plus the 3.8 percent net investment income tax. Together that is 23.8 percent. The $785,400 figure is what those simplified assumptions produce. Change the basis, the filing status, the exclusion, or the income assumption and the tax moves with it.
For 2026, the IRS set the 20 percent long term capital gains rate to begin above $545,500 of taxable income for single filers and above $613,700 for married couples filing jointly. The 3.8 percent NIIT still starts at $200,000 of modified adjusted gross income for single filers and $250,000 for married filing jointly. Those NIIT thresholds have not been indexed for inflation. A $5 million waterfront close will put most owners in both buckets.
Get a current sale range and estimated selling costs for your Jupiter or Tequesta waterfront home.
Why adjusted basis is the lever most longtime owners still have
You cannot rewrite the purchase price. You can often rewrite the basis if the file is complete.
Seawalls, docks, boat lifts, roofs, impact windows, pools, additions, kitchens, bathrooms, and major renovations can raise basis when they are capital improvements and when you can support them. Routine maintenance does not. Your CPA decides what qualifies. My job is to help you gather the file before you list, not after the closing statement is already printed.
I have sat with Jupiter Inlet Colony and Admirals Cove owners who remembered the dock and forgot the seawall, or remembered the kitchen and had no invoices for the impact glass. That gap is not academic. Every dollar of documented basis is a dollar that never enters the taxable gain.
If you want the proceeds conversation in one place first, I already wrote a separate guide on estimating what you actually keep after commissions and closing costs. This page is the tax layer that sits on top of that.
Run the numbers before you list, not after you accept
The sequence that protects you is simple. Get a property specific sale range. Estimate selling costs on that range. Hand both numbers to your CPA with the basis file. Then decide whether listing now, waiting, or holding is the better after tax move.
Listing first and doing the tax math later is how owners get surprised at a number they cannot unwind. A $5 million contract feels like a win until the federal estimate shows up. If the after tax number does not fund the next house, the boat, or the retirement plan, the list price was never the right target.
I can put a current range and estimated selling costs in your hands. You take that packet to your CPA. That is the cleanest way to decide whether selling a Jupiter or Tequesta waterfront home actually gets you where you want to go.
Request a confidential sale range plus the Basis File Checklist.
This page is for education only. It is a simplified hypothetical, not tax, legal, or financial advice, and not a prediction of your result. Talk to your CPA and tax attorney about your facts.
Kyle Camerlinck | Taiter Realty, Jupiter FL Luxury Real Estate