The tax documents probably say (mine did, on the back) that the reason a house is appraised by the assessor is to determine what it would likely sell for on the market. Then your taxes are based on the appraisal amount.
If you just bought the house, you have established what the house would sell for on the open market. I disputed the value the county had appraised it at for tax purposes, because they had my house valued at 100K more than I paid for it. I argued that my buying the house proved its value because it was not a distress sale, foreclosure, etc. I got the value reduced by $100k and saved a ton on taxes. The County assessor, who was in the room, was pissed. Nothing she could do about it though.
If you just bought the house, you have established what the house would sell for on the open market. I disputed the value the county had appraised it at for tax purposes, because they had my house valued at 100K more than I paid for it. I argued that my buying the house proved its value because it was not a distress sale, foreclosure, etc. I got the value reduced by $100k and saved a ton on taxes. The County assessor, who was in the room, was pissed. Nothing she could do about it though.