An Existing Customer Deposit Bonus is a promotional offer provided by financial institutions or online platforms to reward their current customers for making additional deposits. This incentive typically comes in the form of a percentage match on the deposited amount, enhancing the customer's account balance and encouraging further engagement. Such bonuses can vary in terms of eligibility, minimum deposit requirements, and withdrawal conditions, making it essential for customers to read the terms carefully. Overall, these bonuses serve to strengthen customer loyalty and promote continued investment with the institution.