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How does a big lottery winner cash his huge check risk-free?
If the funds are deposited into a noninterest-bearing account, they will be covered by FDIC insurance regardless of the amount (However, this extended coverage may not be valid after Dec. 31, 2012): On November 9, 2010, the FDIC issued a Final Rule implementing section 343 of the Dodd-Frank Wall Street Reform and Consumer Protection Act that provides for unlimited insurance coverage of noninterest-bearing transaction accounts. Beginning December 31, 2010, through December 31, 2012, all noninterest-bearing transaction accounts are fully insured, regardless of the balance of the account, at all FDIC-insured institutions.   (Source: http://www.fdic.gov/deposit/deposits/changes.html)