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When you join Alliant, you are given a 10-digit member account number (otherwise know as an S01) for your initial savings account. Get to know this number and have it handy. Knowing this number will make it easier for you to do business with Alliant - particularly if you call our 24/7 Member Contact Center at 800-328-1935 for personal assistance with your accounts.

Your Alliant member account number is used for direct deposits, electronic bill payments, IRS tax refunds, Social Security deposits and any ACH deposit, withdrawal, or payment to and from your Alliant loan or deposit accounts.

If you don't know your correct member account number, you may experience problems, such as not receiving a proper credit for a loan payment you made, having credits or debits from outside sources applied to another member's account or being unable to transfer money from your account to another Alliant member.

Where can you find your Alliant account number? On:

• Your account statements
• Your loan documents
• Other Alliant correspondence to you 
• In Alliant Online Banking

Perhaps, the easiest - and quickest - way to get your S01 savings account number handy is to log in to Alliant Online Banking, click "Help" on the top of the screen and then choose the "Electronic transfer guide" button. If you use your S01 number to log in to Alliant Online Banking, consider the option to change and personalize your "Username or Account Number" to make it easier for you to remember.

If you call Alliant's Member Contact Center and don't know your member account number, a Member Service Representative will ask you to provide your Social Security Number (SSN). If you don't give out your SSN, you'll experience a longer process to have your account validated and may have your call escalated to a supervisor. To keep all our members' accounts secure, the Member Contact Center cannot accept your credit card or debit card numbers to access your account and its Member Service Representatives cannot verbally give you your account number over the phone. (You can only receive your member account number by mail or fax.) So take it easy on yourself and get to know your Alliant member account number.

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