Q: How does the deposit insurance coverage on noninterest-bearing transaction accounts affect a customer’s insurance coverage for other types of accounts?
A: he insurance coverage on noninterest-bearing transaction accounts is separate from, and in addition to, the coverage provided for other accounts maintained at the same IDI. Funds held in noninterest-bearing transaction accounts will not be aggregated for purposes of determining deposit insurance coverage on the depositor’s interest-bearing accounts. For example, if under the single ownership category a customer has $500,000 in a noninterestbearing transaction account and $250,000 in a certificate of deposit, the FDIC would fully insure the entire $750,000.
This can be found in - FAQ#7 of FDIC’s FAQs. FDIC’s FAQs can be found at: http://www.fdic.gov/deposit/deposits/unlimited/faq.pdf