Capital Gains Tax When Selling Your San Diego Home (2026)
By Dylan Eterovich
| July 1, 2026
How capital gains tax really works when selling a San Diego home: the
TLDR
If you sell your primary San Diego home, you can exclude up to
M+ of appreciation.
Important: This article is educational, not tax advice. Everyone's situation is different — talk to a CPA or tax attorney before making decisions. Tax law changes; verify current rules at irs.gov and ftb.ca.gov.
Why This Matters So Much in San Diego
San Diego home values have roughly tripled since 2010. If you bought a house in Clairemont for $350,000 in 2009 and it's worth
.1 million today, you're sitting on $750,000 of gain. Whether you owe tax on that — and how much — depends entirely on the rules below.
We talk to sellers every week who either:
- Overestimate the tax hit and stay stuck in a home that no longer fits their life, or
- Underestimate it and get an ugly surprise at tax time
Both mistakes are expensive. Here's how it actually works.
The Home Sale Exclusion (Section 121): The Big One
If the home is your primary residence, federal law lets you exclude:
| Filing Status | Excluded Gain |
|---|---|
| Single | 50,000 |
| Married filing jointly | $500,000 |
The Requirements
- Ownership test: You owned the home for at least 2 years out of the last 5 before sale.
- Use test: You lived in it as your main home for at least 2 years out of the last 5. The 2 years don't need to be continuous.
- Frequency limit: You haven't used the exclusion on another sale in the past 2 years.
California conforms to this exclusion — if your gain is fully excluded federally, it's excluded on your state return too.
San Diego Example
Maria (married) bought a North Park house in 2008 for $420,000 and sells in 2026 for
,050,000. After $60,000 in selling costs, her gain is $570,000. The couple excludes $500,000 — they pay capital gains tax on only $70,000, not $570,000.
50K/$500K exclusion?
How Your "Gain" Is Actually Calculated
Your gain is not just sale price minus purchase price. It's:
Sale price − selling costs − adjusted basis = gain
Your adjusted basis starts with what you paid and grows with:
- Capital improvements — remodels, additions, new roof, HVAC, solar (owned), landscaping projects, permitted ADUs
- Certain closing costs from when you bought
It does NOT include repairs and maintenance (painting, fixing leaks).
Keep every receipt from every improvement. A
50,000 kitchen-and-ADU history can directly erase
50,000 of exclusion — often enough to wipe out the entire gain.
50,000 of taxable gain. This is where San Diego sellers leave the most money on the table.
00,000 of gain above the $500K exclusion might pay roughly 15% federal + ~9.3% state ≈ $48,000-$50,000 in combined tax on that excess.
What Rates Apply to Gains Above the Exclusion
Federal Long-Term Capital Gains (held over 1 year)
| 2026 Taxable Income (married joint, approx.) | Rate |
|---|---|
| Lower incomes | 0% |
| Middle incomes (most sellers) | 15% |
| Roughly $600K+ | 20% |
High earners may also owe the 3.8% Net Investment Income Tax (NIIT) on gains above the exclusion.
California State Tax
California has no special capital gains rate — gains are taxed as ordinary income at rates from 1% to 13.3%. For a typical San Diego household, expect roughly 9.3% on significant gains.
Combined Reality Check
A married San Diego couple with
Special Situations (Where Most San Diego Sellers Actually Live)
Inherited Homes: The Stepped-Up Basis
When you inherit a home, your basis "steps up" to the fair market value at the date of death. Decades of appreciation vanish for tax purposes.
Example: Mom bought the La Mesa house in 1985 for
20,000. It's worth $900,000 when she passes. Your basis is $900,000. Sell it for $920,000 and you owe capital gains tax on roughly
0,000 — not $800,000.
This is why inherited homes are often best sold relatively soon after inheritance. For the full picture, see our inherited property guide and probate sale guide.
Rental & Investment Properties
No Section 121 exclusion. You'll face:
- Capital gains tax on the full gain
- Depreciation recapture taxed at up to 25% federally — this surprises nearly every first-time landlord seller
- California ordinary income rates on everything
The main escape hatches:
- 1031 exchange — defer all of it by buying another investment property (strict 45/180-day deadlines)
- Move in for 2 years — convert it to your primary residence to earn a partial exclusion (post-2008 rules prorate it)
Divorce
Transfers between spouses in a divorce are tax-free at the time of transfer. If you sell as part of the divorce, careful timing can preserve the full $500,000 joint exclusion. See our divorce home sale guide.
Partial Exclusion for Unforeseen Circumstances
Sold before hitting 2 years because of a job move (50+ miles), health condition, or unforeseen circumstances (divorce, multiple births, death in family)? You may qualify for a prorated exclusion. Living there 12 of 24 months gets a married couple up to
Over 55? Prop 60/90 Is Gone — But Prop 19 Helps
California's Prop 19 lets homeowners who are 55+, disabled, or wildfire victims transfer their low property tax base to a new home anywhere in California, up to 3 times. This isn't capital gains relief, but it removes the property-tax penalty of moving — a huge deal for longtime San Diego owners contemplating a downsize.
Withholding at Closing: California's 3⅓% Surprise
When you sell California real estate, escrow generally must withhold 3⅓% of the gross sale price (or an elected alternative based on estimated gain) and send it to the Franchise Tax Board — unless you certify an exemption (most common: the home was your principal residence). Non-resident sellers and investors, plan for this cash-flow hit at closing. You settle up (refund or balance) when you file your return.
7 Legitimate Ways San Diego Sellers Reduce the Tax Bill
- Document every improvement since purchase — raise your basis
- Time the sale for a lower-income year (retirement year sales are popular)
- Use the 2-of-5 rule strategically — a former rental can regain partial exclusion after you move back in
- Harvest losses elsewhere in your portfolio the same tax year
- 1031 exchange for investment property
- Installment sale — spread the gain (and the tax) across years
- Hold until death if it's the family plan — heirs get the stepped-up basis
And one thing that does NOT work: selling "off the books" cheap to a relative. The IRS treats bargain sales to family as part-gift, and you can create gift-tax problems without saving anything.
Frequently Asked Questions
Do I owe capital gains tax if I sell my San Diego house at a loss?
No tax is owed — but losses on a personal residence are not deductible either. Investment property losses generally are.
I've lived in my house 30 years and my gain is way over $500K. Now what?
You'll owe tax only on the amount above your exclusion, and your improvement history reduces that further. Many longtime owners find the actual bill far smaller than feared once basis is properly calculated. Get a CPA to run the real numbers before letting tax fear keep you in a house that doesn't fit.
Does selling to a cash buyer change my taxes?
No. The IRS doesn't care whether your buyer used cash or a mortgage — your gain calculation is identical. What changes: certainty, speed, and zero commissions (which effectively reduces your selling costs and slightly increases your gain, but commissions were deductible from the sale price anyway).
How does the $500K exclusion work if my spouse died?
A surviving spouse can still use the full $500,000 exclusion if the home sells within 2 years of the spouse's death (and the tests were met). Community property in California also generally gets a full double step-up in basis at the first spouse's death — often eliminating the gain entirely. This is a huge, underused benefit; talk to a CPA.
What about the rumored change to the
Congress periodically proposes raising the exclusion (it hasn't been adjusted since 1997). As of this writing nothing has changed — plan around current law and check with your tax professional at sale time.
Do I have to report the sale on my tax return?
If you receive a Form 1099-S from escrow (most sellers do), report the sale even if the gain is fully excluded. If no 1099-S is issued and the gain is fully excludable, reporting may not be required — but when in doubt, report.
The Bottom Line for San Diego Sellers
For most owner-occupants, the primary-residence exclusion wipes out most or all of the tax. The people who genuinely need planning are:
- Longtime owners with $500K+ of gain
- Landlords facing depreciation recapture
- Heirs who wait years to sell an inherited property while it appreciates past the stepped-up basis
- Sellers with less than 2 years in the home
If taxes are part of what's keeping you from selling, get real numbers from a CPA — and if you want a real number for what your house is worth in cash today, that part we can do in 24-48 hours.
Get a no-obligation cash offer or call us. We're local, we work alongside your tax professional's timeline, and we can close in 7-21 days — or on whatever date works best for your tax year.