Denver’s long run-up in home values is great news right up until tax season, when a big gain can turn into a surprising bill. The good news is that most people selling their primary home owe far less than they fear, and many owe nothing at all. Here is what sellers and investors along the Front Range should understand about taxes when selling a house in Colorado before they get to closing, including the one exclusion that wipes out the bill for most homeowners and the strategies that help when it does not. If you want to go deeper on spreading a gain over time, we cover installment sales here.
Do You Pay Capital Gains Tax When You Sell a House in Colorado?
Here is the short answer. You only pay capital gains tax on a home sale in Colorado on your profit, not on the full sale price, and only on the profit that sits above the federal exclusion. There are two layers to think about: the federal capital gains tax and Colorado’s flat state income tax, which also applies to the gain. For most primary-residence sellers, the federal exclusion erases the federal bill entirely, and often the state one too. For investors and rental owners the math is different, and we cover that below.
The Home-Sale Exclusion Is Your Best Friend
The single most important rule for anyone selling a house in Denver is the federal primary residence exclusion, known as the Section 121 exclusion. If the property was your main home for at least two of the last five years, you can exclude up to $250,000 of gain if you are single, or $500,000 if you are married filing jointly, per IRS Section 121 and Publication 523.
That is why so many Denver sellers owe nothing federally. Consider a couple who bought in 2016 for $400,000 and sell in 2026 for $850,000. Their gain is $450,000, which sits under the $500,000 married exclusion, so they owe $0 in federal capital gains tax on the sale. This is the part worth understanding early, because it turns a scary number into a manageable one for most homeowners.
The catch is that you have to qualify, so keep your records. Document how long you owned the home and that you lived in it as your primary residence, since the two-of-five-years ownership and use test is what unlocks the exclusion.
How Colorado Taxes the Gain
Colorado is refreshingly simple here. The state does not have a separate capital gains rate. Instead, it taxes the gain as ordinary income at its flat state income tax rate, which is currently around 4.4%. There is no distinction between short-term and long-term gains at the state level the way there is federally, so the holding period does not change your Colorado rate.
One planning note: Colorado once offered a state-level capital gains subtraction, but that benefit has largely expired, so plan on the full flat rate applying to any taxable gain rather than counting on a state deduction. Figures should be confirmed as current at the time you sell, since rates can change.
What You’ll Actually Pay: A Denver Example
Once your gain is above the exclusion, the profit becomes a taxable capital gain after selling your house. Held more than a year, it is taxed federally at 0%, 15%, or 20% depending on your income, and higher earners may also owe the 3.8% net investment income tax.
Here is how it looks with real numbers. Take that same couple, but say they sell for $1,000,000 instead. Their raw gain is $600,000. First, subtract the $500,000 exclusion, leaving $100,000 that is potentially taxable. At a 15% federal long-term rate, that is $15,000 federally, plus Colorado’s roughly 4.4% on the $100,000, or about $4,400, for a combined bill near $19,400.
And that is before adjustments that usually shrink the number further. Your taxable gain is reduced by your cost basis, which includes the original purchase price, the cost of capital improvements over the years, and selling costs like real estate commissions. A new roof, a finished basement, or an addition all raise your basis and lower the gain, so tracking those receipts genuinely pays off.
Selling a Rental or Investment Property
Investment property plays by different rules. Rental and investment properties do not get the Section 121 exclusion, so the full gain is generally taxable. On top of that, they face depreciation recapture, meaning the depreciation you claimed over the years gets taxed when you sell, at a federal rate of up to 25%. If you have owned a Denver rental for a while, this is often the biggest and most overlooked piece of the bill, so it is worth taking the time to model it before you list. The strategies in the next section, especially the 1031 exchange, are aimed squarely at investors in this position.
Selling an Inherited Home or a Second Home
Two more situations come up constantly along the Front Range. If you are selling a house you inherited, the news is usually good. Inherited property receives a stepped-up basis, meaning its cost basis resets to the fair market value on the date of the previous owner’s death. Heirs who sell soon after inheriting often owe little or no capital gains tax on inherited property in Colorado, because there has been almost no gain since that step-up.
A second home is the opposite story. It does not qualify for the primary residence exclusion, since it was not your main home, so the capital gains tax on a second home applies to the full gain above your basis. If you are thinking about selling a mountain place or a rental you once lived in, the timing and the paper trail matter.
Three Ways to Lower or Defer the Tax
If you are going to owe, you have real options. Here are the three that matter most for avoiding capital gains tax when selling a house in Colorado, or at least softening it.
- 1031 exchange. A 1031 exchange in Colorado lets investors defer the gain entirely by rolling the proceeds into another investment property, as long as you follow the strict timelines: 45 days to identify the replacement property and 180 days to close. This is an investor tool, not something for a primary residence, but it is powerful for building a real estate portfolio without a tax hit at every sale.
- Installment sale. An installment sale lets you spread the gain, and the tax, across multiple years by carrying part of the financing and receiving payments over time. Because the gain lands in smaller pieces each year, it can keep you in a lower bracket and reduce the total bite. We break the whole strategy down here.
- Timing and basis. Track every capital improvement you make, because those costs raise your basis and shrink the taxable gain. Timing the sale into a lower-income year, or coordinating it with other deductions, can also pull you into a friendlier federal bracket.
Does Colorado Have a Real Estate Transfer Tax?
This one is a pleasant surprise. There is no statewide Colorado real estate transfer tax. The state charges only a small documentary fee of one cent per $100 of value, which comes to about $40 on a $400,000 home. A handful of Colorado towns, such as Winter Park, do levy their own local transfer tax, so if your property sits inside one of those municipalities, factor that in. For most Front Range sellers, though, transfer tax is a non-issue.
Frequently Asked Questions
Do I pay capital gains tax if I sell my primary home in Denver?
Only on gain above the federal exclusion. If you owned and lived in the home for two of the last five years, you can exclude up to $250,000 of gain if single or $500,000 if married filing jointly, and many sellers owe nothing as a result.
How much is capital gains tax in Colorado?
Colorado taxes capital gains as ordinary income at its flat state rate, currently around 4.4%, on top of any federal capital gains tax you owe.
Do you pay capital gains when you sell an inherited house in Colorado?
Often very little. Inherited property gets a stepped-up basis to its value on the date of the prior owner’s death, so if you sell soon after inheriting, there is usually little gain to tax.
How long do I have to live in a house to avoid capital gains in Colorado?
You generally need to have owned and used the home as your primary residence for at least two of the five years before the sale to claim the federal exclusion.
Does Colorado have a real estate transfer tax?
No statewide transfer tax, just a documentary fee of one cent per $100 of value. A few individual towns add their own local transfer tax.
Get Help Planning Your Denver Home Sale
The bottom line for Denver sellers is to model the tax before you list, not after. A short conversation with a Colorado tax professional can be worth thousands, especially on investment property where depreciation recapture and a 1031 exchange are in play. And if you are selling while you also owe back taxes, Boxelder’s tax relief team can help you handle both at once. Boxelder’s Denver team helps sellers and investors plan around capital gains before they close: https://boxelderconsulting.com/contact-us/.
