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How come the government can value a home more than was paid for the house?
The property tax valuation and the fair market price are NOT one and the same.  They track each other, correlate to each other, but are almost NEVER the same number. In some parts of the USA, a municipality has to re-assess property tax values every ten years.  In these places, the tax value of a property is on something like a 10-year moving average, NOT on the volatile daily market price. EDIT:  It is easy to fall into the "trap" of thinking that property tax valuation is intended to represent fair market value.  It's INTENT is to provide an accurate (or, as accurate as possible) RELATIVE VALUATION of your property compared to the other properties in the municipality. The sum of all the property values is the tax base of the municipality.  When the town budget (which is paid in part via property taxes) is set, the town simply divides the tax base into the budget total to arrive at the ratio of tax-to-collect, to the tax base, also called the "tax rate per thousand dollars of valuation."  i.e. if the town tax base is US$10,000,000, and the town budget is US$500,000, then the ratio is 0.05, or $50 per thousand dollars of valuation.  If your property is assessed at US$100,000, then you would pay 100 x $50, or $5000 in property taxes that year. Since this is the goal of the property tax valuation, NOT deciding what your house is worth on the open market, then we are left with the question of "why use the market value of a house for property assessment?" and the answer is that of all the various schemes and algorithms you can try, "fair market value" is the easiest and most accurate...IF TIME FLUCUTATIONS ARE TAKEN OUT.  For example, if I buy a house in a development for $250,000 today, and next summer the housing market crashes, and you buy the identical house next door to me for $150,000, it does NOT stand to reason that you should pay less taxes than me, because your house is "worth" $100,000 less.  In fact, BOTH our houses are worth $100,000 less. What matters most in property tax valuation isn't the actual number, but rather, is YOUR valuation the same as other essentially similar properties in your tax base?  Getting the RELATIVE ratio of value between you and your neighbors correct is the goal of property tax valuation.