excess profit

Translations
избыточная прибыль
The company was taxed on its excess profits.
Компания была обложена налогом на избыточную прибыль.
Definitions
Excess profit refers to the amount of profit earned by a business or individual that exceeds the normal or expected level of profit in a particular industry or market. It is often considered as profit above what is necessary to cover costs and provide a reasonable return on investment, and may result from factors such as monopoly power, market inefficiencies, or unique advantages.
Words
excess

adjective
избыточная
profit

noun
прибыль