noun
income-based levy; per income levy; taxation on income basis
A tax or levy calculated based on income, often used in the context of Japanese local inhabitant taxes (住民税) where the income-based portion is contrasted with the per-capita portion.
住民税は所得割と均等割から成る。
The inhabitant tax consists of an income-based levy and a per-capita levy.
所得割の税率は自治体によって異なる。
The tax rate for the income-based levy varies by municipality.
Compound of 所得 (income) and 割 (proportion, levy).