What Is Adjustment
An adjustment is a dollar or percentage modification applied to a comparable property's sale price to account for differences between that property and the subject property being appraised. Appraisers use adjustments when no two properties are truly identical, and they're essential to the sales comparison approach used in property tax assessments.
If a comparable property sold for $300,000 but had a finished basement while your property does not, the appraiser might subtract $15,000 to $25,000 (depending on local market data) to make that sale comparable to yours. These adjustments are where assessment disputes often begin, because disagreement over adjustment amounts directly changes the final assessed value.
Types of Adjustments Used in Assessments
- Physical adjustments: Square footage, lot size, condition, age, number of bathrooms, garage spaces, roof condition
- Location adjustments: Proximity to highways, schools, commercial areas, or undesirable features like power lines
- Market adjustments: Time of sale (properties sold 18 months ago may warrant adjustment for market appreciation or depreciation), financing terms, or non-arm's length sales
- Legal/regulatory adjustments: Zoning differences, easements, deed restrictions, or pending code violations
How Adjustments Affect Assessment Ratios
Most states establish assessment ratios (the percentage of market value at which property is assessed). New Jersey assesses at 100% of market value; Iowa at 90%; Florida varies by county from 85% to 100%. When the assessor makes adjustments to comparable sales, the resulting adjusted values directly determine what assessment ratio your property falls into.
If adjusted comparables average $350,000 and your property is assessed at $280,000 in a 100% assessment state, you're being assessed at 80% of the derived market value. This is a red flag for your board of review hearing, because it suggests your property is being undervalued relative to the market data the assessor used.
Challenging Adjustments at Board of Review Hearings
At a board of review hearing or appraisal appeal, you can directly challenge the adjustments the assessor applied. Request the assessor's adjustment schedule, which shows each comparable and every modification. Common challenges include:
- Adjustments that are too large or too small relative to market evidence
- Adjustments for features that don't actually exist or weren't present at time of sale
- Failure to adjust for sales that occurred in a different market cycle (adjusting for time is critical if your comparable sold during rising or falling markets)
- Inconsistent adjustment standards across different comparable properties
Bring your own appraisal or market study showing different adjustment amounts for the same features. If you have recent sales of nearly identical properties that required minimal adjustments, those are your strongest evidence.
Common Questions
How much adjustment is reasonable?
There's no universal standard, but typical adjustments range from 2% to 8% per feature in stable markets. A 15% adjustment for a missing garage in a market where garages average $18,000 is reasonable; a 25% adjustment for the same feature is excessive. Compare adjustment amounts to actual replacement costs or market-based pricing in your area.
Can an assessor make adjustments for exemptions?
No. Adjustments modify comparable sales to estimate market value. Exemptions (agricultural, homestead, disabled veteran, non-profit) reduce the taxable value after market value is determined. These are separate steps in the appraisal process.
What if I disagree with the adjustment amounts?
Request the assessor's adjustment justification and comparable sales data before your hearing. Obtain your own appraisal if the adjustment spread is significant (some jurisdictions allow appraisal costs as part of appeal recovery). Testify specifically about which adjustments you dispute and why, referencing comparable data from your area.