For your security, Vanguard authenticates your linked bank accounts to ensure that you are authorized to act on the account. We use micro deposits as a part of the authentication process.
You will receive 2 micro deposits on one business day; these are credits to the bank account. The next business day, we pull the sum of the two deposits back to Vanguard, this will show as a debit to your account. You only need to verify the credits with Vanguard.
Once you receive the micro deposits in your bank account, you can go to your bank information page and enter the two micro deposit credit amounts.
You will only be able to use your bank account for purchases into Vanguard until the authentication process is complete.