What is another word for additional payment?
Pronunciation: [ɐdˈɪʃənə͡l pˈe͡ɪmənt] (IPA) 
There are numerous synonyms to describe an additional payment, depending on the context of its use. Some of the commonly used terms include an extra fee, a supplemental charge, a supplementary cost, an add-on expense, and a surcharge. A premium may refer to an extra payment for superior service or a better product. Depending on the business model, a gratuity or tip could also be used as a means of additional payment. Some other terms that could be used include a bonus, commission, or incentive. It is important to choose the right synonym to convey the intended meaning accurately.
