This is the 7211th most frequent Japanese word.
上乗せ
"上乗せ" means "an addition or increase on top of something."
上乗せ is used to mean 'addition' or 'increase' to the existing terms or elements mentioned in the sentence.
彼は契約の条件に上乗せを要求しています。
He is asking for an addition to the contract terms.
上乗せ conveys the idea of 'being added on' as an increase to the existing tax policies.
新しい税金が上乗せされる予定です。
A new tax is planned to be added.
上乗せ describes the action of 'adding on' additional charges or elements to a given value or cost.