租客的押金是否需要单独放账号

It is a landlord's responsibility to store tenants' security deposits during tenancy, but California law does not include any specific requirements for doing so. Unlike states such as Iowa, the deposit does not have to be placed in a separate bank account and, unlike New Hampshire, it is not required to earn interest.

Texas law doesn't require landlords to store a security deposit in a particular way. But again, that's at the state level. It's entirely possible that some localities have various rules and regulations.

纽约：The security deposit must be kept by the owner in an interest-bearing account in a New York State bank. The owner must notify the tenant of the name and address of the bank and pay the tenant the full annual interest, less 1% of the security deposit per year for the owner's administrative costs.