I added this to all my letters, but I delete it if it's not needed:

[@FDIDirDeP]DO YOU WANT to electronically deposit your refund, Yes or No? Is this the correct account, or do we need this information completed, if you say Yes?

[@FDIEFDwP]IF YOU OWE MONEY, do you want to debit it electronically? Yes or No? We will do debit or you will pay by check, but NOT both.

Bank: <@FDIBank>

Routing number: <@FDIRTN> or change to this: ___________________

Account number: <@FDIAcctNo> or change to this: ___________________

Please sign AND RETURN THIS FORM TO ME to verify these numbers: ________________