Assessed vs Market Value Comparison Calculator
Instantly compare your property’s tax assessed value to its estimated market value and evaluate potential property tax implications or over-assessment.
Compare Your Property Values
Enter your property’s estimated market value, current assessed value, and local tax rate. The calculator instantly reveals your assessment ratio and estimated annual tax liability.
Value Comparison Estimator
Calculate assessment ratios and estimate potential property taxes.
Understanding Property Values
Key factors that influence your property assessment
Market Value Dynamics
Market value fluctuates based on supply, demand, interest rates, and recent sales of comparable properties (“comps”) in your immediate neighbourhood.
Assessed Value Lag
Tax assessors often update values on a cyclical basis (e.g., annually or every 3-5 years). This can cause assessed values to lag behind rapid market changes.
The Assessment Ratio
This is the percentage of market value that is actually taxed. A ratio over 100% is a major red flag indicating your property is likely over-assessed.
Exemptions & Reliefs
Many areas offer homestead exemptions, senior citizen discounts, or veteran relief that reduce the taxable assessed value, lowering your final bill.
Assessed Value vs Market Value
Generalised comparisons to help you understand the fundamental differences between these two critical property metrics.
| Feature | Market Value | Assessed Value | Primary Use |
|---|---|---|---|
| Definition | Estimated sale price on the open market | Value assigned by government for taxation | N/A |
| Volatility | Changes frequently with market conditions | Changes on a set government schedule | N/A |
| Who Determines It | Buyers, sellers, and professional appraisers | Municipal or county tax assessors | N/A |
| Financial Impact | Determines your equity and selling price | Determines your annual property tax bill | N/A |
| Can It Be Disputed? | No (it’s an estimate until a sale occurs) | Yes, via a formal assessment appeal process | Assessed Value |
Property Value Calculator FAQ
Answers to the most frequently asked questions about assessed value, market value, and property taxes.
Market value is the estimated amount a property would sell for on the open market under normal conditions. Assessed value is the dollar value assigned to a property by a local government tax assessor specifically for the purpose of calculating property taxes.
Yes, though it is less common. If your assessed value is significantly higher than your current market value (resulting in an assessment ratio over 100%), your property may be over-assessed, and you might have strong grounds to appeal your property tax bill.
The assessment ratio is calculated by dividing the assessed value by the market value, then multiplying by 100 to get a percentage. For example, an assessed value of £200,000 on a home with a market value of £250,000 results in an 80% assessment ratio.
If you believe your property is over-assessed, you can file a formal appeal with your local tax assessor’s office within their designated window. You will need to provide evidence, such as recent comparable sales (comps) or a professional appraisal, showing the market value is lower than the assessed value.
Yes, significant renovations (like adding a bedroom, expanding square footage, or major kitchen remodels) can trigger a reassessment and increase your property’s assessed value, which may subsequently increase your property taxes.