In Miami, this question comes up constantly—especially in Coconut Grove, Coral Gables, and Pinecrest where values have moved fast and long-time owners are sitting on real appreciation.

The honest answer is: maybe. But in many cases, sellers don’t owe capital gains tax on a primary residence because of a powerful federal exclusion—if you qualify.

I’m not a CPA, but here’s the clean framework I use to help sellers understand what to ask their tax pro.

The big rule: the primary residence exclusion

If the home is your primary residence, you may be able to exclude up to:

• $250,000 of capital gain if you’re single

• $500,000 of capital gain if you’re married filing jointly

To qualify, the typical test is the 2-out-of-5 rule: you must have owned and lived in the home for at least two years out of the last five years before the sale (with some exceptions and special situations).

If you meet that test, a huge portion of gains can be tax-free.

How to estimate whether you have a gain

Capital gain is generally the difference between:

Sale price (minus selling costs)
and
Your cost basis (purchase price + certain improvements)

This is where Miami sellers often miss something: major improvements can increase your basis, which can reduce taxable gain. Think: roof replacement, impact windows, HVAC replacement, renovations, additions—especially common in older Grove/Gables homes.

Selling costs also matter: commissions and many closing costs reduce the “net sale price” used in the gain calculation.

Situations where capital gains become more likely

You’re more likely to owe capital gains tax if:

• the home was not your primary residence (second home, investment property)

• you didn’t meet the 2-out-of-5 timeline

• the property was a rental for part of the time (depreciation rules can trigger tax even if you later lived there)

• your gain exceeds the exclusion amount, which can happen in high-appreciation pockets or long hold periods

For Brickell and Miami Beach condos, this often comes up when the unit was rented, used as a second home, or held in an LLC—those details can change everything.

What I recommend you gather before you talk to your CPA

• your original purchase documents

• receipts for major improvements

• the closing disclosure from your sale (once you have it)

• dates you lived in the home vs rented it out