Bank letterhead; Account number; Routing number; Business name. 1. Electronically - Go to our website at MyTax.illinois.The Illinois Department of Revenue (IDOR) sends letters and notices to request additional information and support for information you report on your tax return. Need help setting up or understanding direct deposit? For all changes to your account please complete sections 1 and 7 in addition to the sections that apply to your change (e.g. Understand what types of money and personal property can be protected from debt collectors and how creditors access wages and bank accounts. You can also find your account number on the home page of your CEFCU On-Line® or Mobile Banking account, or with the Account Letter found under Services. "Letters of Office" is not really a letter. Direct Deposit allows State of Illinois payees to electronically receive their payments. Requires two of the following documents: Bank statement (dated within 90 days prior to application).