delivered the opinion of the Court.
This suit was brought in the Court of Claims to recover an overpayment of income taxes made by respondent. The United States conceded that the amount claimed was owed. But the Comptroller General, pursuant to his power under § 305 of the Budget and Accounting Act of 1921 (42 Stat. 20, 31 U. S. C. § 71) settled and adjusted the claim by offsetting against it an amount which he concluded respondent owed the United States under a contract. Since the latter claim equalled the overassessment on the income taxes, the Comptroller General refused to authorize a refund to respondent. This suit followed. The Court of Claims denied the offset and entered judgment for respondent in the amount claimed with interest. 101 Ct. Cls. 85,
The contract under which the claim against respondent was asserted was made in November, 1935. Respondent agreed to supply rice to the Navy Department at the bid prices specified in the contract. A typical price provision listed 290,000 pounds of rice at a unit price (per pound) of .0460 or a total price of 113,340. The contract contained the following provision:
“Prices bid herein include any federal tax heretofore imposed by the Congress which is applicable to the material on this bid. Any sales tax, duties, imposts, revenues, excise or other taxes which may hereafter (the date set for the opening of this bid) be imposed by the Congress and made applicable to the material on this bid will be charged to the Government and entered on invoices as a separate item.”
Respondent made the required deliveries to the United States and received the full price specified in the contract. Respondent was the first domestic processor of the rice and accordingly paid the processing taxes imposed by the Agricultural Adjustment Act (48 Stat. 31, 7 U. S. C. §§ 609, 611) from April 1, 1935, until September 20, 1935. Before paying the processing tax on the rice processed for the month of October, 1935, respondent obtained an injunction against its collection. The tax was held invalid in
United States
v.
Butler,
*109
The tax was a federal tax “applicable” to the rice within the meaning of the contract.
United States
v.
Glenn L. Martin Co.,
The present contract provides for payment by the United States of sales and other taxes thereafter imposed by Congress and made applicable to the rice. But while it makes that provision for upward readjustment of the price, it provides for no downward revision in case of subsequent changes in any tax. That silence gains added significance here in view of the fact that at the time the contract was made the payment of these processing taxes was being hotly contested and the litigation resulting in
United States
v.
Butler, supra,
was well under way. The inference is strong therefore that the parties intended the price to be firm, except as it might be increased through the imposition of new taxes. The provision for the inclusion of applicable taxes provides a formula for determining the price to be billed. Since the tax in question could not by the terms of the contract be. billed to the United States, there was no overcharge. If the contractor lawfully avoids payment of a tax he reduces his cost and increases his profit. But in absence of a provision which authorizes it the reduction of cost is hardly the basis of a refund to the United States. As the Court of Claims points out, it is hard to see how the vendor could be re
*111
quired to pay the United States any savings which it made as a result of reductions in tariff duties.. Yet the difference between them and other taxes under this contract is not apparent. Although there will be exceptions, in general the United States as a contractor must be treated as other contractors under analogous situations. When problems of the interpretation of its contracts arise the law of contracts governs.
Hollerbach
v.
United States,
Affirmed.
Notes
See Act of February 13, 1925, § 3 (b), 43 Stat. 939, amended by the Act of May 22, 1939, 53 Stat. 752, 28 U. S. C. § 288 (b).
Respondent did, however, pay an unjust enrichment tax of $72,072.30 on account of being relieved of the processing tax. See Title III of the Revenue Act of 1936, 49 Stat. 1648, 1734. It was computed and assessed upon the basis of inclusion of units involved *109 in this suit. If those units had been excluded, the unjust enrichment tax would have been reduced by $1,706.59. If respondent is required to reduce its price by the amount of the unpaid processing tax, it is not subject to the unjust enrichment tax on these transactions. See United States v. Kansas Flour Mills Corp., supra, p. 216, note 6. The United States concedes that if it prevails the respondent is entitled to recover $1,706.59.
