value added
Economic term for the increase in value created through production or processing.
added value
Business term for the extra worth or benefit a product or service provides beyond its basic function.
Develop products with high added value.
This service provides added value to customers.
付加価値 is a formal business term for added value, whereas プラスアルファ is a casual, everyday way of saying 'a little extra'.
Compound of 付加 (fuka, 'addition') and 価値 (kachi, 'value').