>> Those numbers at the bottom of a cheque? Yeah, they include your account number. > Yes, as well as the routing number. >> There's no inherent information risk to giving out an account number … >Of _course_ there is. In the US, the account + routing number is sufficient to perform a ACH transfer, write checks against that account, etc. The risk is enormous.

So… how does writing a check remove this risk then? That was the original point, that writing a check is safer than giving out your account number.