I choose to mention the nickname Japanese have for this tax. Really it is the municipal-tax which is either 7% (I think) of the income, or minimum of 180 USD/mo

I choose to mention the nickname Japanese have for this tax. Really it is the municipal-tax which is either 7% (I think) of the income, or minimum of 180 USD/month (in my area, in Tokyo it is higher). The tax is used for the local infrastructure, but has risen dramatically in the past years to cover the costs of pensions. Therefor it got the nickname "elderly tax".