Why Does Cash App Need SSn? The Cash app asks for your ssn or social security number when you make online transactions or purchase something from your Cash app balance and it is just because of verification of your identity. Once the ssn is verified by the Cash app then, you can send money easily. And it is also possible to pay your monthly bills or send money even without the verification of ssn. To attain more clarity, do not forget to make a visit on the website through the given link.