noun
fixed rate; flat rate
Refers to a rate that is set at a constant percentage, as opposed to a fixed amount. Common in tax, finance, and fee structures.
この税金は定率で計算されます。
This tax is calculated at a fixed rate.
定率の手数料がかかります。
A flat-rate commission will be charged.
定額 means a fixed amount (e.g., a flat fee), while 定率 means a fixed percentage rate.
Compound of 定 (fixed) and 率 (rate).