What Is Assessed to Market Ratio
The assessed to market ratio is the percentage of a property's actual market value that the assessor has assigned as its taxable assessed value. If your home sold for $400,000 but the assessor valued it at $320,000, your assessed to market ratio would be 80 percent. This metric reveals whether your property is over-assessed, under-assessed, or fairly valued relative to comparable properties in your jurisdiction.
Most states require assessment ratios to fall within a specific range, typically between 25 and 100 percent depending on local property classification and statutory requirements. Many states target ratios between 90 and 100 percent to ensure uniform taxation across similar properties. When your ratio deviates significantly from the standard, you have grounds for an appeal.
How Assessors Establish Ratios
Assessors determine your ratio by dividing the assessed value by the property's estimated market value. To find market value, they use three primary appraisal methods: the sales comparison approach (analyzing recent comparable sales), the income approach (for rental properties), and the cost approach (construction cost plus land value minus depreciation).
The sales comparison approach is most common for residential properties. Assessors pull data on similar properties that sold within the past 12 to 24 months in your neighborhood or market area. They adjust for differences like lot size, condition, age, and amenities. If comparable homes sold between $380,000 and $420,000, but yours is assessed at $320,000, that's a red flag worth investigating.
Why Your Ratio Matters in Appeals
Your assessed to market ratio is the foundation of any successful property tax appeal. At the board of review hearing, assessors must justify their valuation. If you can demonstrate that similar properties in your area have ratios of 95 percent while yours is 75 percent, you've proven discriminatory or unlawful assessment. This is the core argument in most successful appeals.
The equalization rate (set by your state) adjusts assessed values across jurisdictions for comparison purposes, but your individual ratio tells the real story of whether you're paying your fair share. Properties should have consistent ratios within the same municipality.
Finding Comparable Sales Data
To challenge your ratio, gather recent sales data for properties similar to yours. Check your county assessor's website, county deed records, local real estate boards, or MLS databases. Look for homes that sold in the past 18 months within a quarter-mile radius (for residential) or in the same market area.
- Document sale price, sale date, property address, lot size, square footage, and year built
- Note any unusual circumstances like distressed sales, foreclosures, or non-arm's length transactions, which should be excluded
- Calculate the assessed to market ratio for each comparable property
- Present properties with ratios that differ significantly from yours as evidence of inconsistent assessment
Understanding Assessment Ratio vs. Equalization Rate
The assessment ratio is slightly different from assessed to market ratio. Assessment ratio measures what percentage of property values within a class (residential, commercial, agricultural) are actually assessed by the assessor. Assessed to market ratio is individual and property-specific. At a board of review hearing, you'll likely hear both terms. Know that your individual ratio supports the broader assessment ratio conversation.
Common Questions
- What ratio should I target in an appeal? Most jurisdictions expect ratios between 90 and 100 percent. If yours is below 85 percent and comparable properties are at 95 percent, you have a strong case. Some states with lower statutory ratios (like 50 percent) accept different benchmarks, so check your state's rules.
- How often do assessments change? Many jurisdictions reassess every 1 to 4 years depending on state law. After a reassessment, your ratio may shift. If it moves dramatically upward, request the assessor's market value estimate and compare it against recent sales of your property type.
- Can I use my own appraisal to prove my ratio is wrong? Yes. A third-party appraisal showing a lower market value strengthens your appeal significantly. Professional appraisals are more persuasive than comparable sales analysis alone, though they cost $400 to $600 for residential properties.