A bill working its way through Congress would double the capital gains tax exclusion on home sales — from $250,000 to $500,000 for single filers, and from $500,000 to $1,000,000 for married couples filing jointly. If it passes, this would be the first meaningful update to those limits since they were set back in 1997. That’s nearly three decades of inflation, appreciation, and rising home values — with a tax threshold that hasn’t moved an inch.
For most of the country, this might be a nice-to-have. For Phoenix-area homeowners, it could genuinely change the math on whether to sell.
Why This Exclusion Matters More in Arizona Than Most States
Let’s be direct: $250,000 in profit sounds like a lot until you look at what Phoenix home values have done over the past five years. Median home prices in the Phoenix metro climbed from roughly $300,000 in early 2020 to over $450,000 as of recent market data. Homeowners who bought in Chandler, Gilbert, or Scottsdale a decade ago and put a reasonable down payment down are sitting on equity gains that can blow past the current single-filer exclusion without much effort.
Take a real scenario. A single homeowner bought in Ahwatukee in 2014 for $285,000. The same home is now worth $520,000 or more. That’s over $235,000 in gain — and they’re cutting it close. If they made any improvements, adjusted their basis carefully, and have a good CPA, they might stay under. But plenty of people don’t, and many have gains significantly larger than that.
Married couples in the East Valley, especially those who bought before 2018, are in an even tighter spot. The current $500,000 joint exclusion isn’t the ceiling it once was. A couple who bought in Scottsdale near McCormick Ranch or Paradise Valley adjacent back when prices were half what they are today — they’re looking at potential taxable gains that the current exclusion doesn’t cover.
What the Bill Actually Proposes
The legislation gaining traction in Congress targets Section 121 of the Internal Revenue Code — the provision governing the primary residence exclusion. Here’s a quick breakdown of the proposed changes:
- Single filers: Exclusion increases from $250,000 to $500,000
- Married filing jointly: Exclusion increases from $500,000 to $1,000,000
- Indexing for inflation: Some versions of the bill include future automatic adjustments tied to CPI, so the threshold doesn’t erode over the next 27 years the way the current one has
The two-year primary residence requirement stays in place — so this isn’t a windfall for flippers or short-term speculators. You still need to have lived in the home as your primary residence for at least two of the last five years.
Worth noting: this is still working through the legislative process. It has bipartisan co-sponsors and some real momentum, but it’s not law yet. Sellers who are timing a move around this should watch closely and plan with a CPA, not assume anything.
The Lock-In Effect — and Whether This Could Loosen It
One of the biggest quiet forces suppressing inventory in the Phoenix metro right now is older homeowners sitting on highly appreciated homes — and doing nothing. They don’t want to lose their low-rate mortgage. They don’t want to hand a chunk of their gain to the IRS. So they stay put.
This is related to the broader mortgage lock-in effect driving up accidental landlord behavior across the country. The capital gains piece is a separate but connected layer of friction. Raise the exclusion, and some of those sellers come off the sidelines. That matters in a market where inventory has been a persistent pressure point.
If even a fraction of the long-term owners in places like Tempe, Mesa, or north Scottsdale decide the after-tax math now makes sense, that adds supply at price points where the market genuinely needs it. Not dramatically — but enough to notice.
What Phoenix Sellers Should Be Thinking About Now
Don’t wait for the bill to pass before having the conversation. If you’ve owned your home for more than five or six years in almost any part of the Phoenix metro, you should already be working with a CPA to understand your current gain exposure. A few specific things worth reviewing:
- Calculate your adjusted cost basis — this includes your purchase price plus qualifying improvements (new roof, HVAC replacement, kitchen remodel, etc.). Many sellers underestimate this and overestimate their taxable gain.
- Confirm your primary residence status — two of the last five years, not necessarily the most recent two. Rules around exceptions for job relocation, medical necessity, and other circumstances also exist.
- Evaluate timing strategically — if the bill passes and you’re close to crossing the current exclusion threshold, waiting could mean a meaningful difference in your net proceeds.
- Don’t let taxes be the only driver — if rates drop, if a life change requires a move, or if affordability conditions shift further in buyers’ favor, those factors matter just as much.
The exclusion update wouldn’t eliminate capital gains taxes — it just raises the threshold before they kick in. Any gain above the new limits would still be taxed at long-term capital gains rates, typically 15% to 20% depending on your income.
The Bottom Line for Arizona Homeowners
Phoenix has been one of the highest-appreciation markets in the country over the past decade. That’s been great for wealth building. It’s also created a situation where more and more everyday homeowners — not just mansion owners in Paradise Valley — are bumping up against a tax rule written when the median Phoenix home cost under $130,000.
Doubling the exclusion is overdue. If Congress gets it done, the sellers most likely to benefit are the exact people who’ve been holding the market back: long-term Phoenix-area owners sitting on significant equity, weighing whether a sale actually pencils out after taxes. For anyone in that position, now is the time to run the numbers — not after the bill passes, not when you’re already under contract. Get ahead of it.