Most of the literature that discusses the effect of property taxes on housing values has focused on the degree of capitalization of the property taxes in different areas under different nominal tax rates. We argue that even under a uniform nominal tax rate across different areas, the difference of effective property tax rates will affect housing values. We try to provide some solid evidence in this regard with a careful estimation of the true effective tax rates of properties transacted in two representative districts of Taipei, Ta-Tung and Nei-Hu. After careful estimation, we found that the average effective rates for the sampled properties in the combined districts range from 0.0886 precent to 0.1304 precent. These rates account for only one-fifth of the weighted nominal rate stipulated by the authorities. From the empirical results, we found that the lifting of the effective property tax rate has significant negative effects on housing prices. When the effective property rate increases 1 percent, housing prices will decrease by 2.02 percent. With a 3 percent discount rate and infinite house life to discount the difference between the nominal tax rate and effective property tax rate, housing prices will drop 15 percent. The capitalization rate is about 13 percent, much lower than in other countries.