When your property tax bill goes up, the cause is always one of two things: your property's assessed value, or the tax rate your local government levies. That's the core explanation offered by the Mississippi Department of Revenue, which notes that "there are two factors that affect your property tax: your property value and the millage rate levied in your jurisdiction." Understanding how those two levers interact—and how the rate is tied to the budget that funds your schools, police, and roads—is the key to evaluating any local tax proposal you'll encounter.
Understanding Your Property Tax Bill: The Two Key Factors
Property tax is a two-part calculation. First, someone assigns a value to your property. Second, your local government applies a rate—often called the millage rate—to that value. Multiply them together, and you get the core of your tax bill. Exemptions and credits can adjust the final number, but assessed value and tax rate are the primary components.
The crucial insight is that these two inputs move independently. Your assessment is driven largely by the market and by physical changes to your property. The millage rate is a political decision, set by officials responding to their budget needs. A change in either one can move your bill—and a change in one can offset a change in the other.
Property Assessments: What They Are and How They Change
An assessment is an estimate of what your property is worth for tax purposes. In Mississippi, for example, values are determined by the State Tax Commission using information from a nationwide valuation service, with depreciation applied on a set schedule. The exact process varies by jurisdiction, but the general principle holds everywhere: an assessor estimates a market or "just" value for your home.
That estimate can rise for reasons outside your control. The Mississippi Department of Revenue explains that physical changes such as additions or improvements, inflation, and other economic factors can all push your property's value upward. When home prices climb across your neighborhood, assessments tend to follow—even if you've changed nothing about your house.
