If a wildfire, flood, earthquake, house fire, or other sudden event damages your home or building, California property tax relief after a disaster starts with a calamity reassessment under Revenue and Taxation Code Section 170. File a claim with your county assessor and your property is reappraised in its damaged condition, lowering your tax bill from the first day of the month the damage occurred until you rebuild.1California Board of Equalization. Disaster Relief The damage must knock at least $10,000 off the property’s market value to qualify. Related provisions then let you keep your Proposition 13 base year value when you reconstruct, or carry it to a replacement home elsewhere in California.
What Damage Qualifies
Section 170 covers two kinds of events. A calamity is a widespread disaster such as a wildfire, flood, or earthquake. A misfortune is an isolated incident like a house fire or a burst pipe. Both share a common thread in how California courts read the statute: the event must be sudden, unexpected, and unusual, not the slow result of deferred maintenance.2Sacramento County Assessor. Flood, Fire, Or Disaster: Property Tax Relief That May Save You Money A rotting roof does not qualify. A tree crashing through it in a storm does.
You do not need a Governor’s proclamation for the basic property tax reduction. A house fire on an ordinary weekday counts. A proclamation matters later, when you want to rebuild larger or move to a different county without losing your base year value. The reduction is available whether the loss hits the land, the structure, personal property on site, or a combination, so long as the combined drop in market value reaches the $10,000 floor.1California Board of Equalization. Disaster Relief Loss of access counts too when a Governor-declared disaster cuts off the property, even if the structure itself was not hit.
How to File with the County Assessor
You file an Application for Reassessment of Property Damaged by Misfortune or Calamity with the assessor in the county where the property sits. Most counties post the form online and accept it by web submission, mail, or in person. The form asks for the Assessor’s Parcel Number from your latest tax bill, the date of the incident, a description and estimated dollar amount of the damage, and the estimated current value of the land and anything still standing.3LA County Assessor. Disaster Relief
The deadline is 12 months from the date of damage, or the period specified in your county’s local ordinance, whichever is later.1California Board of Equalization. Disaster Relief Miss the window and you lose the reassessment. If the assessor sends you a notice and application within that year, you get an additional 60 days from the notice date to respond.2Sacramento County Assessor. Flood, Fire, Or Disaster: Property Tax Relief That May Save You Money
Documentation shortens the process. Take photos of the damage as soon as it is safe. Collect written repair estimates from licensed contractors. Save anything showing the property’s condition beforehand, such as a recent appraisal or listing photos. An appraiser from the assessor’s office may visit to verify the damage before issuing the new value.
How the Reduced Bill and Refund Work
Once the claim is approved, the assessor determines the full cash value of your land, improvements, and personal property immediately before and immediately after the event, calculates the percentage drop for each category, and applies those percentages to the values already on the roll. The reduction cannot exceed your actual loss. The adjusted value takes effect on the first day of the month the damage occurred and stays in place until you rebuild or repair.1California Board of Equalization. Disaster Relief
If you already paid taxes based on the higher pre-disaster value, the county issues a prorated refund covering the date of damage through the end of the fiscal year. The same math applies to supplemental assessments from a recent purchase or new construction: if disaster strikes before the supplemental period ends, the supplemental value gets adjusted down and any overpayment refunded. When damage and restoration both fall inside the same tax year, you can end up with both a refund for the damaged period and a new supplemental bill for the restored value.4Nevada County. Disaster Relief
Keeping Your Base Year Value When You Rebuild
Rebuilding does not trigger a reassessment to current market value, and this is one of the more valuable protections in California property tax law. If you reconstruct on the same site in a substantially equivalent manner, your prior Proposition 13 base year value is reinstated no matter what the construction actually costs. Only the portion that goes beyond what existed before, an added bathroom or extra square footage, is treated as new construction and assessed at current market value.1California Board of Equalization. Disaster Relief
For property damaged in a Governor-proclaimed disaster, Section 70.5 gives you more room. The reconstructed property can be worth up to 120 percent of the pre-disaster market value and still keep its original base year value. Only the amount above the 120 percent threshold is added to the base.5Ventura County Assessor. Rebuilding Your Damaged or Destroyed Property That headroom is where upgraded materials and disaster-resistant construction usually fit.
Moving to a Replacement Property Instead
Sometimes rebuilding on the same lot is not what you want. Two provisions let you carry your base year value to a replacement home, and they work differently enough that the choice matters.
Proposition 19, effective April 1, 2021, lets disaster victims transfer their base year value to a replacement property anywhere in California, including a different county, with no county ordinance required. To qualify, the original property must have been substantially damaged or destroyed by a Governor-declared disaster, meaning it lost more than 50 percent of its improvement value. You must sell the damaged property within two years of buying the replacement, and file a claim with the assessor in the replacement county within three years of acquiring or constructing it.6California Board of Equalization. Proposition 19 Base Year Value Transfer Guidance
Section 69.3 is the older path. The replacement property must be of equal or lesser value than the original, adjusted on a sliding scale: 105 percent within the first year, 110 percent within the second, 115 percent within the third. You have three years from acquiring the replacement to file.1California Board of Equalization. Disaster Relief Which provision saves you more depends on the price of the replacement relative to the original, so run the numbers under both before filing.
Casualty Loss Deductions on Income Taxes
Your income tax return is a separate track from the property tax bill, and the rules are stricter than most people expect.
On federal returns, personal casualty losses are deductible only if the damage came from a federally declared disaster.7Internal Revenue Service. Topic No. 515, Casualty, Disaster, and Theft Losses A house fire that is not part of a larger declared disaster fails this test even though it fully qualifies for property tax relief under Section 170. When a federal declaration does apply, you subtract insurance reimbursement and salvage value from the total loss, then apply a $100 floor per casualty event ($500 under the qualified disaster loss rules), and only losses exceeding 10 percent of adjusted gross income are deductible.8Internal Revenue Service. Form 4684 – Casualties and Thefts Report the deduction on IRS Form 4684.
California’s Franchise Tax Board generally follows federal law but also allows a deduction for losses from a Governor-declared disaster even when no federal declaration was issued.9California Franchise Tax Board. Disaster Loss Deduction One rule applies to both returns: if you had insurance coverage, you must file a timely claim. Skipping the insurance claim and deducting the full loss is not allowed.7Internal Revenue Service. Topic No. 515, Casualty, Disaster, and Theft Losses
How Insurance and FEMA Payments Interact
FEMA disaster assistance grants are not taxable income and do not affect eligibility for Social Security, Medicare, Medicaid, SNAP, or other federal benefits.10FEMA. FAQ: Will FEMA Assistance Affect My Other Benefits? For a federal casualty loss deduction, though, any reimbursement from insurance or FEMA has to be subtracted from your loss first. Only the unreimbursed portion is deductible.7Internal Revenue Service. Topic No. 515, Casualty, Disaster, and Theft Losses
The Section 170 property tax reduction works differently. It reflects what the property is actually worth in its damaged state, and insurance proceeds or FEMA grants do not reduce the relief. When you rebuild, the assessor restores your prior base year value under the rules described above.
If the Assessor Denies or Undervalues Your Claim
You can appeal a denial, a post-damage value you think is too high, or a refund you believe is too small. Every California county has an Assessment Appeals Board, or a Board of Supervisors acting in that role, and its decisions are legally binding.11California Board of Equalization. Assessment Appeals
Start by calling the assessor’s office. A lot of disagreements come from incomplete documentation or a narrow reading of the damage, and staff can often resolve them without a hearing. If that does not work, file with the Assessment Appeals Board in your county and bring independent evidence: a professional appraisal, contractor repair estimates, comparable sales of damaged properties, and photographs. Appraisals for damage documentation typically run a few hundred dollars depending on complexity. Keep paying the current tax bill while the appeal is pending; any overpayment is refunded if you win.