Will You Owe Capital Gains Tax Selling Your Fairfax Home?
Do you have to pay capital gains tax when you sell your home in Fairfax, VA?
Most homeowners don’t. The IRS lets you exclude up to $250,000 of profit from tax if you’re single, or $500,000 if you’re married filing jointly, as long as you’ve owned and lived in the home as your main residence for at least two of the last five years. If your profit falls under that number, you owe nothing in capital gains tax. If it’s above it, only the excess is taxed — and Fairfax County’s appreciation over the past couple of decades means more sellers here are bumping into that ceiling than you’d expect.
By Cristina Dougherty | July 27, 2026
I get some version of this question from almost every seller who’s owned their home more than ten years: “Am I going to get hit with a huge tax bill when I sell?”
The honest answer is that most people won’t owe a dime. Here’s how the math actually works, so you know which camp you’re in before you list.
The $250,000/$500,000 exclusion, and how it actually works
Under IRC Section 121, the IRS lets you exclude a chunk of your home sale profit from capital gains tax entirely — not defer it, not roll it into your next purchase, just exclude it, permanently. The exclusion is $250,000 if you file single, and $500,000 if you file a joint return with your spouse.
To qualify, you need to pass two tests, both measured over the five years before your closing date:
- The ownership test. You owned the home for at least two of those five years.
- The use test. You lived in it as your main residence for at least two of those five years.
The two years don’t have to be consecutive, and they don’t have to overlap perfectly with each other. You also generally can’t have used this exclusion on a different home sale within the two years before this one.
Here’s the part that surprises people: your “profit” for this calculation isn’t just sale price minus purchase price. It’s your sale price minus your adjusted cost basis, which is your original purchase price plus the cost of capital improvements you’ve made over the years — a new roof, a kitchen remodel, a finished basement, an addition. Routine maintenance and repairs don’t count, but real improvements do, and they directly reduce your taxable gain. If you’ve been in your home a while, digging up those old renovation receipts before you list is worth the time.
Why long-time Fairfax owners are the ones who need to check the math
Fairfax County’s home values have climbed steadily for years, and the first half of 2026 kept that trend going: the median sale price across the county came in at $780,000, up from $765,000 a year earlier, with the average sale price now over $928,000.
If you bought a single-family home in Chantilly, Herndon, Franklin Farm, or Franklin Glen back when prices were a third or a quarter of today’s numbers, and you’re now selling in the $900,000 to $1,750,000 range, it’s worth sitting down and actually running your gain. A couple who bought for $250,000 in the late 1990s and sells today for $1,100,000 has roughly $850,000 in appreciation before accounting for improvements and selling costs — comfortably inside the $500,000 married exclusion in some cases, and well past it in others, depending on their basis and how long they’ve owned it.
This is exactly the kind of situation where the exclusion still helps enormously, but doesn’t necessarily wipe out the entire gain. And that’s the calculation I walk clients through before we even talk about listing price, because it changes how someone thinks about their net proceeds and their timing.
What happens to the gain above the exclusion
If your gain is bigger than your exclusion, the excess is taxed as a long-term capital gain at the federal level, at 0%, 15%, or 20%, depending on your total taxable income for the year. For most sellers with a meaningful gain above the exclusion, the 15% bracket is where they land. High earners may also owe an additional 3.8% Net Investment Income Tax on top of that.
Virginia doesn’t have a separate capital gains tax. Stack those together, and a seller with gain above the exclusion could be looking at somewhere in the neighborhood of 20% to 26% combined federal and state tax on the excess, before factoring in the Net Investment Income Tax if it applies. That’s a real number worth knowing well before your closing date, not the week of it.
None of this replaces sitting down with a CPA or tax preparer who can look at your actual basis, your filing status, and your full financial picture. If you’re also weighing what closing costs will look like on top of this, my breakdown of Fairfax County seller closing costs is a good next stop.
What to do before you list
If you’ve owned your home for a decade or more, or you know your neighborhood has appreciated significantly since you bought, take these steps before you sign a listing agreement:
- Pull your original purchase documents to confirm your starting basis.
- Gather receipts or records for capital improvements — additions, major renovations, new systems — since routine repairs don’t count, but these do.
- Estimate your likely sale price using a current market analysis, not a Zestimate.
- Run the numbers with a tax professional if your estimated gain is anywhere close to your exclusion amount.
- Map your listing against your timeline — the home selling timeline I walk clients through covers how pricing, prep, and closing dates all interact with this kind of planning.
Frequently Asked Questions
Do I have to pay capital gains tax if I sell my house in Virginia?
Most sellers who’ve owned and lived in their home for at least two of the last five years owe nothing.
How is my capital gain actually calculated?
It is not simply today’s price minus what you originally paid.
Does Virginia have its own capital gains tax rate?
No. Virginia taxes capital gains as ordinary income rather than at a special capital gains rate.
Can I use the exclusion more than once?
Yes, but generally not more than once every two years, and only for a home that passes both the ownership and use tests during the five years before that particular sale.
What if I only lived in the home for part of the two years, due to a job change or health issue?
You may still qualify for a partial exclusion in certain circumstances, such as a change in employment, health, or other unforeseen circumstances. This is a fact-specific determination, so it’s worth reviewing with a tax professional rather than assuming either way.
Most sellers in Chantilly, Herndon, Franklin Farm, and Franklin Glen are going to fall comfortably under the exclusion and never think about this again. I’m happy to walk through what your specific situation looks like, alongside the rest of your net proceeds picture.
Call or text Cristina at 703-969-0471, or visit www.GetKeyedUp.com to get started.
About Cristina Dougherty
Cristina Dougherty is a top-producing REALTOR® in Fairfax and Loudoun Counties with 20+ years of experience and 500+ homes sold. Based in the Western Fairfax County area, she specializes in downsizing, first-time buyers, and move-up sellers.