What Is Sales Comparison Approach
The Sales Comparison Approach is a valuation method that estimates a property's market value by analyzing recent sales of similar properties in the same geographic area. Assessors use this method to establish the assessed value on your property tax bill. Instead of using income potential or construction costs, this approach relies on what comparable properties actually sold for in the open market.
How Assessors Use It in Your Assessment
When your local assessor values your property, they typically gather 3 to 5 comparable sales from the past 6 to 12 months. They then make adjustments to account for differences between your property and the comps. A typical adjustment factors in square footage, lot size, age of the building, condition, parking, lot frontage, and any special features.
For example, if a comparable home sold for $350,000 but has an updated kitchen worth $15,000 more than yours, the assessor subtracts $15,000 to reflect your property's actual value. Most states aim for assessment ratios between 85% and 95% of true market value, though some allow up to 100%.
Why This Matters for Your Appeal
The Sales Comparison Approach is the most common and defensible method assessors use. At a Board of Review hearing, assessors justify their valuation by presenting the comps they selected and the adjustments they made. If you believe your assessment is too high, you can challenge this method by presenting your own comparable sales data showing lower values.
Understanding which comps the assessor chose, whether they're truly comparable, and whether adjustments were made fairly gives you concrete grounds for an appeal. Many successful appeals rest on proving that the comps used don't accurately reflect your property's actual market value.
The Mechanics in Practice
- Assessors identify properties with similar characteristics, location, and sale dates within the past 12 months.
- Each comparable receives line-item adjustments for differences from your property, typically ranging from 2% to 15% per adjustment.
- The adjusted sale prices are averaged to establish the estimated market value and corresponding assessment.
- You have the right to request the comps and adjustment details from your assessor before your Board of Review hearing.
- Challenge the selection of comps if they're from different neighborhoods, sold under duress, or required excessive adjustments (over 25% total).
Common Questions
- Can I use my own comps at a Board of Review hearing? Yes. Bring 2 to 4 comparable sales that support a lower valuation. Focus on properties sold within 6 months and in your immediate area. Document the sales price, condition, and any adjustments that make them more relevant to your property than the assessor's picks.
- What if there are no recent sales in my area? Assessors may use properties from adjacent neighborhoods or extend the time window to 18 months. This weakens their case. You can argue that older comps don't reflect current market conditions, and you should present more recent sales from similar areas to counter this.
- Do exemptions affect the Sales Comparison Approach? No. Agricultural, homestead, or charitable exemptions are applied after value is determined, not during the Sales Comparison Approach process. Your property is assessed at market value first, then the exemption reduces your tax bill.