systems provide an upper limit on earnings subject to the tax. A few systems provide that the tax is payable only on wages above a particular amount. Such upper or lower limits may apply for retirement but not for health-care components of the tax. Some have argued that such taxes on wages are a form of "forced savings" and not really a tax, while others point to redistribution through such systems between generations (from newer cohorts to older cohorts) and across income levels (from higher income levels to lower income-levels) which suggests that such programs are really taxed and spending programs. Payroll or workforce Unemployment and similar taxes are often imposed on employers based on the total payroll. These taxes may be imposed in both the country and sub-country levels. Wealth A wealth tax is levied on the total value of personal assets, including: bank deposits, real estate, assets in insurance and pension plans, ownership of unincorporated businesses, financial securities, and personal trusts. Liabilities (primarily mortgages and other loans) are typically deducted, hence it is sometimes called a net wealth tax. Property Recurrent property taxes may be imposed on immovable property (real property) and on some classes of movable property. In addition, recurrent taxes may be imposed on the net wealth of individuals or corporations. Many jurisdictions impose estate tax, gift tax or other inheritance taxes on property at death or at the time of gift transfer. Some jurisdictions impose taxes on financial or capital transactions. Property taxes A property tax (or millage tax) is an ad valorem tax levy on the value of a property that the owner of the property is required to pay to a government in which the property is situated. Multiple jurisdictions may tax the same property. There are three general varieties of property: land, improvements to land (immovable man-made things, e.g. buildings), and personal property (movable things). Real estate or realty is the combination of land and improvements to the land. Property taxes are usually charged on a recurrent basis (e.g., yearly). A common type of property tax is an annual charge on the ownership of real estate, where the tax base is the estimated value of the property. For a period of over 150 years from 1695, the government of England levied a window tax, with the result that one can still see listed buildings with windows bricked up in order to save