; and in addition, an amount, not to exceed 2 percent of the amount provided herein, shall be available proportional to the amount by which the product of recipients and the average benefit received exceeds the amount available for payment of vested dual benefits: Provided , That the total amount provided herein shall be credited in 12 approximately equal amounts on the first day of each month in the fiscal year. Federal payments to the railroad retirement accounts For payment to the accounts established in the Treasury for the payment of benefits under the Railroad Retirement Act for interest earned on unnegotiated checks, $150,000, to remain available through September 30, 2019, which shall be the maximum amount available for payment pursuant to section 417 of Public Law 98–76 . Limitation on administration For necessary expenses for the Railroad Retirement Board ( Board ) for administration of the Railroad Retirement Act and the Railroad Unemployment Insurance Act, $113,500,000, to be derived in such amounts as determined by the Board from the railroad retirement accounts and from moneys credited to the railroad unemployment insurance administration fund: Provided , That notwithstanding section 7(b)(9) of the Railroad Retirement Act this limitation may be used to hire attorneys only through the excepted service: Provided further , That the previous proviso shall not change the status under Federal employment laws of any attorney hired by the Railroad Retirement Board prior to January 1, 2013. Limitation on the office of inspector general For expenses necessary for the Office of Inspector General for audit, investigatory and review activities, as authorized by the Inspector General Act of 1978, not more than $10,000,000, to be derived from the railroad retirement accounts and railroad unemployment insurance account. Social security administration Payments to social security trust funds For payment to the Federal Old-Age and Survivors Insurance Trust Fund and the Federal Disability Insurance Trust Fund, as