California Prop 19 Master Guide

Complete basis transfer explanation, limits, timing, worked examples, tax strategy for 55+ downsizers

⚠ IMPORTANT: This is educational. You need a California tax accountant or CPA to apply Prop 19 to your specific situation. Tax law is complex; this guide covers basics only.

What Is Prop 19?

Proposition 19 (passed 2020, effective 2021) allows California homeowners who are 55+ (or disabled, or victims of wildfire/disaster) to transfer their current home's assessed property tax basis to a replacement home anywhere in California, even if the replacement is more expensive.

Why this matters: California's Prop 13 (1978) froze property tax assessments at time of purchase + 2% annual increases. When you sell and buy a new home, your assessment resets to market value (often resulting in 50–100% higher taxes). Prop 19 lets you keep your old assessment on the new home.

The Numbers: Why Prop 19 Is Valuable

Without Prop 19:

Sell Bay Area home ($2M market, $300K assessed basis). Buy San Diego home ($1M market).

New assessment: $1M × 1.25% = $12,500/yr property tax

With Prop 19:

Same homes. But your $300K basis transfers to the new home.

New assessment: $300K × 1.25% = $3,750/yr property tax

Annual savings: $8,750 | 20-year savings: $175,000

This is not a small advantage. This is the most valuable tax law for California retiring homeowners.

Key Rules & Limits

Who Qualifies

  • Must be 55+ at time of sale of original home
  • Must have owned the home 2 of the last 5 years before sale
  • Must occupy home as principal residence
  • Can only do this once per homeowner (lifetime)

Timing

  • Must purchase replacement home within 2 years of selling original home
  • Replacement home must be in California (can be any county, any city)

Price Limits

  • Purchase up to or more expensive: Full basis transfer (best case)
  • Purchase cheaper: Reduced basis transfer (you lose the downsize advantage)
  • Example: Selling $2M home with $400K basis, buying $1.5M replacement = basis reduced proportionally to $300K

Multiple Parcels

  • Basis can transfer to ONE replacement property only
  • If replacement home is more than one parcel, basis still applies to primary residence only

The Two-Year Window: Timing Critical

Start the clock when: Your original home sale closes (money exchanges hands)

Must complete: New home purchase within exactly 2 years from original sale closing date

Strategy: Sell first, then take time to find the right San Diego home. You have 2 years. Don't rush.

How Much Basis Transfers?

Scenario 1: Downsizing (Most Common)

Original home: $2.2M market value, $350K assessed basis

Replacement home: $1.0M purchase price

Basis that transfers: $350K (full amount, even though buying cheaper). Assessment on new home: $350K

Result: Annual tax on $1M home = $4,375/yr (instead of $12,500/yr)

Scenario 2: Upsizing (Rare for Retirees)

Original home: $800K market value, $250K assessed basis

Replacement home: $1.5M purchase price

Basis that transfers: $250K (your full old basis) + market value difference ($1.5M – $800K = $700K new assessment) = $950K total new assessment

Result: Annual tax on $1.5M home = $11,875/yr (instead of $18,750/yr without basis transfer)

What About Improvements?

Improvements to original home increase your basis: If you put $50K into renovations (kitchen, roof, etc.) documented with permits and receipts, your basis can increase by $50K.

Strategy: Keep records of all capital improvements (roof replacement, major renovation, new HVAC, addition). These increase your transferred basis.

Cosmetic updates (painting, landscaping, minor repairs) don't count. Only structural/capital improvements.

What Prop 19 Does NOT Do

  • Does not eliminate capital gains taxes: Federal capital gains tax on home sale still applies (though $250K/$500K exclusion covers most primary residence sales)
  • Does not transfer between spouses easily: Both spouses must meet 55+ rule for both to get benefit
  • Does not apply to investment property: Only primary residence
  • Does not freeze future increases: Once transfer happens, new home assessment grows at 2%/year like normal

Implementation: How to File

  1. Sell original home. Document sale price, closing date, and get your assessed basis from county assessor's office.
  2. Purchase replacement home within 2 years. Make sure to occupy it as primary residence.
  3. File Prop 19 claim with county assessor of the county where new home is located. This must happen BEFORE the new assessment notice is issued (usually 60 days after purchase).
  4. Get a CPA or tax accountant to verify. They'll help file the claim and respond to any assessor questions.

Red Flags & Common Mistakes

  • Missing the 2-year window: If you close on purchase more than 2 years after sale, you lose Prop 19. Don't miss this deadline.
  • Not filing claim on time: File within 60–90 days of purchase. Missing this window may cost you the benefit.
  • Assuming it's automatic: County assessor won't automatically apply Prop 19. You must file the claim.
  • Buying before selling: If you buy replacement before selling original, you may lose benefit. Timing matters.

The Real Wealth Transfer: $100K–$300K Over 20 Years

For most California retirees downsizing to San Diego, Prop 19 saves $5,000–$15,000 per year in property taxes. Over 20 years, that's $100K–$300K in savings that you keep instead of sending to the state.

This is the single biggest financial advantage of moving from expensive CA markets to San Diego.

Next Steps

1. Get your current home's assessed basis from county assessor's office (online, free). 2. Find a California CPA who specializes in real estate & Prop 19. Budget $500–$1,000 for consultation. 3. Calculate your specific advantage based on your home value and target San Diego purchase price. 4. Plan your timeline around the 2-year window.

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