A minimum security deposit is a minimum amount you need to pay to the bank as collateral for your loan. The minimum deposit is usually around $200 but can be lower or higher depending on the issuer’s requirements. The collateral acts as a security for an issuer. If you do not make payments on your credit card or loan, the issuer will use your security deposit to cover the expenses and may even close your account without refunding the security deposit. However, if you pay on time, the deposit will stay untouched and when you pay off the credit account and close it, most issuers will refund your security deposit back.