SLGS securities are non-marketable and cannot be bought, sold, or transferred after they are originally issued. Time Deposit SLGS securities are issued in whole dollar amounts with a minimum amount of $1,000. Demand Deposit SLGS securities are automatically rolled over each day until redemption is requested. Demand Deposit SLGS are also issued with a minimum of $1,000, but are not required to be whole dollar amounts. Congress sets a limit, known as the debt limit, on the amount the Federal Government is allowed to borrow. During past debt limit impasses, new Time and Demand Deposits SLGS sales have been suspended. Consistent with the Department of the Treasury's past practice, outstanding Demand Deposit securities will be rolled over into special 90-day Certificates of Indebtedness.