Such fees, late payment penalties, and accrued interest collected shall be credited to the account that incurs the cost and shall remain available without fiscal year limitation to pay the expenses incurred by the Secretary in carrying out this chapter. Such funds collected (including late payment penalties and any interest earned) may be invested by the Secretary in insured or fully collateralized, interest-bearing accounts or, at the discretion of the Secretary, by the Secretary of the Treasury in United States Government debt instruments.