Better Homeowners
Selling Colorado and the Colorado Lifestyle

Understanding Capital Gains on Your Home Sale - 12/31/2025

Selling your home can be a significant financial event and it's important to understand how capital gains taxes may apply. Fortunately, U.S. tax law offers generous exclusions for homeowners under certain conditions, and with proper recordkeeping, many can reduce or eliminate their tax burden altogether.

Here's what every homeowner should know about capital gains, exclusions, and the importance of documenting improvements.

What Are Capital Gains?

Capital gain is the profit you make from selling your home. It's calculated as the difference between your adjusted cost basis and the sale price (minus allowable selling costs, such as real estate commissions).

Sale Price ... (Purchase Price + Capital Improvements + Selling Costs) = Capital Gain

Capital Gains Exclusion for Your Primary Residence

Under IRS rules, if the home you're selling is your primary residence, you may be eligible to exclude a portion of the capital gain from taxation.  If the home you're selling is your primary residence, you may be able to exclude up to $250,000 in capital gains if you're single, or up to $500,000 if you're married and file jointly.

To qualify, you must have owned and lived in the home for at least two of the five years before the sale, and you must not have used this exclusion on another property in the past two years. This exclusion can make a significant difference in the net proceeds from your sale.

Example: A married couple sells their home for $800,000. They bought it for $400,000 and made $50,000 in qualifying improvements. After deducting $30,000 in selling expenses, their gain is $320,000. Since that's under the $500,000 exclusion, they owe no capital gains tax.

Why Tracking Home Improvements Matters

Your cost basis isn't just the purchase price; it includes the cost of capital improvements made to the home. These improvements can reduce your taxable gain by increasing your basis.

Capital improvements are upgrades that either add value to the home, prolong its useful life, or adapt it to new uses.  It is only necessary to meet one of these requirements.

Examples of improvements that increase your basis:

  • Adding a room or garage
  • Installing a new roof or HVAC system
  • Remodeling a kitchen or bathroom
  • Replacing windows or flooring
  • Building a deck or finishing a basement

Routine maintenance and repairs, such as painting, fixing a leaky faucet, or patching a roof, do not qualify. They may be necessary, but they don't add to your basis.

Pro Tip: Keep a Home File

Keeping a folder or digital record that includes purchase documents, receipts for improvements, contractor invoices, permits and plans, and records of major appliance installations can be valuable for proof in case of an audit.  Photos before and after can also be helpful.

This documentation can make a significant difference when it's time to sell and report your capital gain.  For more information, contact your tax professional and download IRS Publication 530.

In Summary

  • Capital gains are based on your sale price minus your adjusted cost basis.
  • Homeowners may exclude up to $250,000 (single) or $500,000 (married) in gains on their primary residence.
  • Documenting improvements is essential to reduce your potential tax bill.
  • Only capital improvements, not maintenance, add to your cost basis.

By understanding these rules and keeping good records, you can make the most of the tax advantages of homeownership and retain more of your equity when you sell.  Download our Homeowners Tax Guide.

Kathleen Harken CRS, GRI, SFR, AHWD Keller Williams Realty DTC Englewood, CO (303) 909-5990 My introduction to the world of real estate came at an early age, working alongside my father in the industry. This early exposure instilled in me a deep appreciation for the intricate dynamics of the field. After brief detours into investment banking, mortgage lending, and marketing, I found my true calling in real estate in 1995. My diverse background equips me with a unique perspective that I use in crafting informed and strategic solutions for my clients. With each client I serve, my primary goal is to cultivate a tailored and educational experience. I understand that every individual approaches the real estate process with distinct aspirations and requirements. My dedication to client education stands as a cornerstone of my practice. I firmly believe that an informed client is an empowered one. I take the time to elucidate the intricate details of the buying and selling process, ensuring that my clients make decisions with confidence and clarity. This commitment to education extends to navigating the ever-evolving market landscape, equipping clients with insights that enable them to make confident choices. I've also been an active participant in the real estate community. Serving as Chairman of the Board at the local board of REALTORS in 2005-2006, a state director at the Colorado Association of REALTORS, and roles in the Colorado state CRS chapter, I continually seek ways to contribute and stay attuned to industry trends and best practices. While my professional commitment is unwavering, I also relish the Colorado outdoors and adventure that comes with it. Whether scaling Colorado's peaks or enjoying the camaraderie of a hockey game, or a bike ride/run on one of the many trails around the city, I find solace in the exhilaration of these pursuits. And, amidst all these ventures, my greatest adventure has been the 25+-year journey of marriage to my husband, Dale, and our shared commitment to fostering and raising large breed dogs. A unique fact about me is my non-skiing status ... a quirk that adds a touch of individuality to my Colorado roots. With a profound dedication to professionalism, client education, and a keen understanding of market trends, I offer a comprehensive experience that places the client at the forefront. Navigating the real estate landscape can be complex, but with my guidance and educational approach, my clients are empowered to make informed choices that align with their goals. Contact Me Visit my Website Send a Referral Subscribe to Newsletter