What Is Decline in Value
A decline in value is a temporary reduction in your property's assessed value when its market value drops below the assessed value established in the previous year. This typically occurs after major market downturns, natural disasters, or significant property damage. Unlike permanent assessment changes, a decline in value is usually reversed when market conditions improve and comparable sales data supports a higher valuation.
When Decline in Value Applies
Most assessors use an annual review process tied to the assessment roll. If your property's fair market value falls below the prior year's assessed value, you may qualify for a decline in value reduction. The key threshold is typically a 5% to 10% drop in market value, depending on your jurisdiction and the specific assessment cycle.
Common triggers include neighborhood market corrections, property damage from fire or flooding, major structural defects discovered during appraisal, rezoning that reduces permitted uses, or environmental contamination. If comparable sales in your area show declining prices year-over-year, this strengthens your claim.
How to File and File Deadlines
You typically file a decline in value appeal directly with your county assessor's office, separate from a board of review hearing. Filing deadlines vary by state and county, but most require submission within 30 to 45 days of receiving your assessment notice. In California, for example, you must file by the assessment roll close date, which is typically in early July.
Your filing should include:
- A completed decline in value or supplemental assessment appeal form
- Evidence of comparable sales in your neighborhood from the past 90 days
- Documentation of property damage, defects, or physical depreciation
- Recent appraisals or broker price opinions if available
- Photos showing damage or deferred maintenance
Using Comparable Sales Data
Assessors use the sales comparison approach to establish fair market value. You'll need to identify 3 to 5 recently sold properties similar to yours in location, size, condition, and use. Sales must be arm's-length transactions from willing buyers and sellers, not distressed sales or family transfers.
Adjust your comparable sales for differences in square footage, lot size, condition, and amenities. If a comparable sold for $450,000 and your property is 10% smaller, you'd adjust downward accordingly. The goal is demonstrating that your assessed value exceeds what similar properties actually sold for in the current market.
Assessment Ratios and the Rule
States vary on assessment ratios. In some jurisdictions, your assessed value must be a specific percentage of market value, typically 30% to 50%. If your assessed value is $200,000 and comparable sales show your home's market value is $350,000, but the assessment ratio is 50%, the assessor may argue your assessment is correct. However, if market value falls to $300,000, your assessed value would now exceed the proper ratio, supporting your decline claim.
Board of Review Appeal Process
If the assessor denies your decline in value request, you can appeal to your county board of review (or assessment appeals board, depending on your state). Present your comparable sales evidence, explain market conditions affecting your neighborhood, and request a specific reduced assessment amount. The board will compare your evidence against the assessor's valuation. Be prepared to discuss your comps' relevance, market trends, and property-specific issues affecting value.
Common Questions
- Will filing a decline in value appeal trigger a reassessment that raises my value later?
- Not automatically. A decline in value addresses temporary market downturns. When your market value eventually rises back to previous levels, the assessed value typically adjusts accordingly at the next normal assessment cycle. You're not locked into a permanently lower assessment. However, in states with Proposition 13 or similar caps, you may retain some assessment benefits even as market values recover.
- How much documentation do I need to prove decline in value?
- Assessors require evidence sufficient to demonstrate fair market value. Three to five solid comparable sales usually suffice. If your property has damage or defects, photos and repair estimates strengthen your case. The stronger your comparable sales evidence, the less supplemental documentation you'll need.
- Can I file both a decline in value appeal and a regular assessment appeal?
- In some jurisdictions, yes, but strategies differ. A decline in value appeal focuses on market conditions and recent comparable sales. A standard assessment appeal may challenge the appraisal method, assessment ratio, or property characteristics. Consult your local assessor's office on which avenue best fits your situation.