Federal code and international treaty make it pretty clear what the service corporations are supposed to do, or in this case not do, when it comes to taxes.
31 U.S. Code § 3124. Exemption from taxation
(a) Stocks and obligations of the United States Government are exempt from taxation by a State or political subdivision of a State. The exemption applies to each form of taxation that would require the obligation, the interest on the obligation, or both, to be considered in computing a tax, except—
(1) a nondiscriminatory franchise tax or another nonproperty tax instead of a franchise tax, imposed on a corporation; and
(2) an estate or inheritance tax.
(b) The tax status of interest on obligations and dividends, earnings, or other income from evidences of ownership issued by the Government or an agency and the tax treatment of gain and loss from the disposition of those obligations and evidences of ownership is decided under the Internal Revenue Code of 1986 (26 U.S.C. 1 et seq.). An obligation that the Federal Housing Administration had agreed, under a contract made before March 1, 1941, to issue at a future date, has the tax exemption privileges provided by the authorizing law at the time of the contract. This subsection does not apply to obligations and evidences of ownership issued by the District of Columbia, a territory or possession of the United States, or a department, agency, instrumentality, or political subdivision of the District, territory, or possession.
18 U.S. Code § 8. Obligation or other security of the United States defined
The term “obligation or other security of the United States” includes all bonds, certificates of indebtedness, national bank currency, Federal Reserve notes, Federal Reserve bank notes, coupons, United States notes, Treasury notes, gold certificates, silver certificates, fractional notes, certificates of deposit, bills, checks, or drafts for money, drawn by or upon authorized officers of the United States, stamps and other representatives of value, of whatever denomination, issued under any Act of Congress, and canceled United States stamps.
ICCPR (International Covenant on Civil and Political Rights)
Part 1 Article 1
2. All peoples may, for their own ends, freely dispose of their natural wealth and resources without prejudice to any obligations arising out of international economic co-operation, based upon the principle of mutual benefit, and international law. In no case may a people be deprived of its own means of subsistence.
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