Capital Gains Tax and Selling Your Home: What Idaho Sellers Should Know | Kuna, ID

If you bought your Kuna home in 2018 for $350,000 and it's worth $550,000 today, you've built real equity. Maybe you're looking at retirement, maybe you're relocating for work, or maybe you just want something smaller and easier to maintain. That $200,000 in appreciation is a powerful resource, but there's one question a lot of sellers bring up once we start running numbers: What happens when the IRS notices?

Here's the short version. If you sell your primary residence in Kuna and meet a couple basic conditions, the IRS typically lets you exclude up to $250,000 of gain as a single filer or up to $500,000 as a married couple filing jointly. That means for most Kuna homeowners, your profit on the sale will be entirely tax-free. But if you exceed those limits or don't meet the requirements, capital gains tax kicks in, and you'll want to know what that looks like before you list.

Writing from September 2026, the Kuna market is showing signs of sustained appreciation. In August 2026, the median sold price in Kuna hit $474,990, up from $443,990 a year earlier in August 2025. That's a solid year-over-year increase in a town where buyers are still chasing space, privacy, and access to the Treasure Valley without Boise or Meridian price tags. If you've owned your home for five or ten years, that appreciation adds up quickly.

How the Capital Gains Exclusion Works

You qualify for the exclusion if you've owned your home for at least two years and lived in it as your primary residence for at least two of the last five years. The two years don't have to be consecutive. They don't have to be the most recent two years. They just have to total 24 months within the five-year lookback period before your sale date.

If you meet those rules, you exclude up to $250,000 of gain as a single person or $500,000 if married and filing jointly. Your gain is the difference between your sale price and your adjusted basis, which is typically your original purchase price plus the cost of major improvements, minus any depreciation if you used part of the home as a rental or business property.

Let's say you bought a home in Rising Sun in 2019 for $380,000. You put in a new deck, upgraded the HVAC, and finished part of the basement for another $40,000 in improvements. You sell in 2026 for $575,000. Your basis is $420,000, so your gain is $155,000. You're married and filing jointly. That entire gain is excluded. Zero federal tax on that $155,000. That's how the exclusion works when everything lines up.

What Happens If You Exceed the Limit

If your gain is bigger than the exclusion amount, you'll owe long-term capital gains tax on the excess. The current federal long-term capital gains rate is 0%, 15%, or 20%, depending on your income. Most Treasure Valley sellers fall into the 15% bracket. Idaho also has a state capital gains tax, which is taxed as ordinary income at a top marginal rate of 5.8% for 2026.

Let's use another example. You bought a larger custom home in Caspian for $450,000 in 2018, and you're selling now for $825,000. That's a $375,000 gain. You're married, so you exclude $500,000, but that still leaves you with zero taxable gain in this case. But if that same home had been purchased for $300,000 instead, your gain would be $525,000. After the $500,000 exclusion, you'd owe tax on $25,000. At a 15% federal rate, that's $3,750 in federal tax, plus roughly $1,450 at Idaho's 5.8% rate. You're still keeping most of your profit, but you need to plan for it.

The Primary Residence Requirement Matters More Than You Think

Your home has to be your primary residence, not a vacation home, rental property, or second home. If you've been renting it out, even for a few months, the IRS may prorate your exclusion or disallow it entirely depending on how long the rental period lasted. If you've lived in the home for most of the last five years and rented it out for the last six months before selling, you can still qualify for a partial exclusion. But if you converted it to a rental two years ago and it's been generating income ever since, you're probably not getting the full benefit.

I work with sellers in Kuna who bought homes five or six years ago and rented them out for a couple of years before moving back in. Your CPA will need to look at the timeline and calculate how much of your ownership period qualifies. This is one of those situations where talking to a tax professional early, before you list, can save you a surprise at closing.

What Counts as Your Adjusted Basis

Your basis isn't just what you paid for the house. You get to add in the cost of capital improvements, which are upgrades that add lasting value to the property, not just routine repairs. A new roof counts. New windows count. Finishing a basement, adding a deck, installing central air, upgrading electrical panels, all of that adds to your basis and reduces your taxable gain.

What doesn't count: painting, replacing a garbage disposal, fixing a leaky faucet, mowing the lawn. Those are maintenance, not improvements. If you've kept receipts and contractor invoices over the years, pull them together. Your CPA will want them, and they can make a real difference if you're close to the exclusion limit.

If you refinanced and rolled closing costs into your loan, those costs don't increase your basis. Neither do your monthly mortgage payments. What you're looking for are capital expenses that physically improved or extended the life of the property.

Kuna's Market Appreciation and What It Means for Gains

Kuna saw steady appreciation through 2025 and into 2026, even as inventory improved slightly across Ada County. In August 2026, the median sold price was $474,990, compared to $443,990 in August 2025. That's about a 7% year-over-year increase. Homes are selling with a median days on market of just 14 days, which means buyers are still moving quickly when they find a property they like.

If you've owned your home for three to five years, you've likely captured a meaningful portion of that appreciation. If you bought in Fossil Creek, Valor, or Crimson Point before 2022, you may have seen values climb 20% to 30% or more depending on the specific timing and condition. That's great news when you're ready to sell, but it also means you need to be realistic about what the tax picture looks like if your gain exceeds the exclusion.

For homes purchased after 2020, appreciation has been slower but still present. Prices softened slightly in early 2023 and then stabilized through 2024 and 2025. If you bought in 2022 or 2023 near the peak, your gain may be smaller, and the exclusion will cover it entirely. Either way, running the numbers before you list is part of good planning.

When Do You Pay Capital Gains Tax

Capital gains tax isn't deducted at closing. You report the sale when you file your federal and Idaho income tax returns for the year in which the sale closed. If you close in October 2026, you'll report it on your 2026 tax return, which you'll file in early 2027. If you know you're going to owe tax, you may need to make estimated payments to avoid underpayment penalties. Your CPA can walk you through that once they see the final closing statement.

You'll receive a Form 1099-S from the title company if your sale meets certain reporting thresholds. Even if you don't receive one, you're still required to report the sale. The IRS gets a copy of your closing statement through other channels, so there's no hiding a home sale.

What If You Don't Qualify for the Full Exclusion

There are partial exclusion rules if you had to sell early due to a job change, health issue, or unforeseen circumstance. The IRS defines unforeseen circumstances pretty narrowly: divorce, death, multiple births, job loss, casualty loss, things like that. Moving because you want a bigger house or a nicer neighborhood doesn't count.

If you qualify for a partial exclusion, the amount you can exclude is prorated based on how long you actually lived in the home. If you owned it for one year instead of two, you get half the exclusion. Again, this is tax-specific advice that your CPA needs to confirm, but it's worth knowing the option exists if life didn't give you the full two years.

Strategies to Reduce or Defer Capital Gains

If you're selling an investment property or second home, not your primary residence, you can't use the exclusion. But you can do a 1031 exchange to defer the tax by reinvesting the proceeds into another like-kind property within strict timelines. That's a whole separate process with its own rules, and it doesn't apply to primary residences, but it's a tool if you're selling a Kuna rental property and rolling it into another investment.

For primary residences, your best move is usually just making sure you meet the ownership and use tests so you can claim the full exclusion. If you're married and filing separately, you each get a $250,000 exclusion tied to your own ownership and use. If one spouse owned the home before marriage, there are nuances about how the exclusion applies. Again, talk to your CPA.

Another strategy some sellers consider is holding off on the sale until they've lived in the home long enough to qualify. If you're at 18 months, waiting another six months may be worth tens of thousands of dollars in tax savings. That only works if the market supports the delay and if you're not facing a hard deadline.

How This Connects to Pricing and Positioning Your Kuna Home

When I sit down with sellers to discuss pricing strategy through The Seller's Edge system, one of the questions I ask is whether there's a tax consideration that affects the timing or net proceeds calculation. If you're going to owe tax on part of your gain, that changes how much cash you'll actually walk away with after closing. It doesn't change the list price, but it changes how we set expectations around your bottom line.

For example, if you're selling at $575,000 and your gain puts you $30,000 over the exclusion limit, you may owe around $6,000 to $7,000 in combined federal and Idaho tax. That's money you need to set aside. If your goal is to net a certain amount for your next purchase or retirement, we need to factor that in from the beginning.

Selling a home isn't just about the sale price. It's about what you keep. And part of keeping more is understanding where the tax line is and planning around it.

If you're thinking about selling your Kuna home and you're not sure how capital gains tax applies to your situation, the first step is talking to a CPA who understands Idaho tax law and real estate transactions. The second step is making sure your home is priced, prepared, and positioned to capture full market value so you're maximizing the gain you worked hard to build. That's what we do.

Have more questions about selling your Kuna home? Visit our Kuna Home Selling FAQ for straight answers on pricing, closing costs, timing, and more.

Barry Lance | Owner/Broker/Realtor® | 208-488-1433 | [email protected] | LanceRealty.com