This is а direct appeal by the United States from a district court judgment holding unconstitutional § 501 (c)(14)(B) of the Intеrnal Revenue Code of 1954, '26 U. S. C. §501 (c)(14)(B) (1964 ed., Supp. V), on the ground that it arbitrarily discriminates between Maryland Savings-Share Insurance Corp. (MSSIC), the ap-pellee, and-other similar nonprofit, mutual insurers.
MSSIC was established by the Maryland Legislature with the object of insuring the accounts of shareholders of member sаvings and loan associations. Although first chartered in 1962, it seeks the benefit of § 501 (c) (14) (B), which exempts from tаx nonprofit corporations such as appellee but only if organized before Seрtember 1, 1957. 1 *5 MSSIC’s position is that September 1, 1957,. is an arbitrary and unconstitutional cutoff date which must be excised from the section, leaving the section applicable to all corporations of the same nature as itsélf regardless of the date of their creation. We do not agree.
Prior to 1951, all savings and loan associations were exempt from taxation of income derived from their operations. Also exempt were nonprofit corporations that insured thе savings institutions. In 1951, the exemption for savings and loan associations was discontinued, on findings that the industry had dеveloped to a. point comparable to that of commercial banks. The exemption for insurers, however, was continued, provided they were already in existence as оf September 1, 1951. See Revenue Act of 1951, § 313 (b), 65 Stat. 490; S. Rep. No. 781, 82d Cong., 1st Sess., 22-29; 2 U. S. Code Cong. & Ad. News 1969, 1991-1997 (1951). As of that date thrеe private insurers fell within the scope of the section — two of them in Massachusetts and onе in Connecticut. Then, in 1956,'a fourth such corporation was organized in Ohio, and four years later Cоngress moved the cutoff date forward to September 1, 1957. Act of April 22, 1960, 74 Stat. 54.
In 1963, a similar bill, H. R. 3297, 88th Cong., 1st Sess., which would have moved the cutoff, date forward to January 1, 1963, for the benefit of MSSIC, passed the House, but was never reported out by the Senate Finance Committee. Testimony before the committeе indicated *6 that continued forward movement of the date might lead to proliferation of state insurers that could hinder the operations and threaten the financial stability of -the Federаl Deposit Insurance Corporation and the Federal Savings and Loan Insurance Corporation. See Hearing on H. R. 3297 before the Senate Committee on Finance, 88th Cong., 2d Sess., 9-10 (1964).
Against this background, the District Court’s invalidation of § 501 (c) (14) (B) was error. The fact that Con-: gress enacts a statute cоntaining a “grandfather clause,” which exempts from the general income tax certain cоrporations organized prior to a specified date, does not of itself indicate that Congress has made an arbitrary classification. Cf
. Stanley
v.
Public Utilities Comm’n,
Having noted probаble jurisdiction by order of October 12, 1970, we now reverse the judgment of the District ^our^'
So ordered;
Notes
Internal Revenue Code § 501 (c) (14) (B), 26 U. S. C. §501 (c)(14)(B) (1964 ed., Supp. V), provides:
“(B) Corporations or assоciations without capital stock organized before September 1, 1957, and operatеd for mutual • purposes and *5 without profit for the purpose of providing reserve funds for, and insurance of shares or deposits in—
“(i) domestic building and loan associations,
“(ii) cooperative banks without capital stock organized and operated for mutual purposes and without profit, or
“(in) mutual savings banks not having capitаl stock represented by shares.”
The District Court’s reliance on
Mayflower Farms, Inc.
v.
Ten Eyck,
