BUSINESS SAVINGS ACCOUNTS Blackhawk Bank & Trust business savings accounts are open to non-profits, municipalities, corporations, and sole proprietors. This is an interest bearing account with a minimum opening deposit of $100. BUSINESS MONEY MARKET DEPOSIT ACCOUNT Available to non-profits, municipalities, corporations and sole proprietorships. This is a non-personal, interest-bearing account. Minimum deposit to open is $2,500. If you have questions or would like more information on Business Savings Accounts, please call a Customer Service Representative at 309.787.4451.