Justice Rehnquist
delivered the opinion of the Court.
The State of Washington’s principal source of revenue is a sales and use tax imposed on the buyer or consumer in all retail sales and consumer uses of tangible personal property.1 [538]*538In this case the United States contends that one aspect of that tax statute — its application to building construction — is invalid under the Supremacy Clause of the United States Constitution. The statutory provisions are most easily understood in light of their history.
Before 1941, building contractors were treated as consumers for sales tax purposes. All sales of tangible personal property, such as construction materials, to contractors were subject to the sales tax. The legal incidence of this tax was on the contractor; the tax was collected by suppliers who sold to contractors, and remitted by them to the State.
In 1941, Washington changed the sales tax system it applied to contractors by defining the landowner who purchases construction work from the contractor, rather than the contractor, as the “consumer.” The legal incidence of the tax was now on the landowner, who paid tax on the full price of the construction project. The net result was that contractors’ labor costs and markups were added to the tax base, which had previously included only the cost of tangible personal property sold to contractors.
The post-1941 tax system could not, however, be applied to construction for the Federal Government because the Supremacy Clause prohibits States from taxing the United States directly. United States v. New Mexico, 455 U. S. 720 (1982). Thus, when the United States was the landowner, Washington did not collect any tax on the sale either of tangible personal property to the contractor or of the finished building to the Government.
In 1975, the Washington Legislature acted to eliminate the complete tax exemption for construction purchased by the United States.2 It did so by reimposing the pre-1941 tax on [539]*539contractors that work for the Federal Government (“federal contractors”).3 Thus, Washington now taxes the sale of non-federal projects to the landowner, and taxes the sale of materials to federal contractors. The net result is that for federal projects the legal incidence of the tax falls on the [540]*540contractor rather than the landowner, and the tax is measured by a lesser amount than the tax on nonfederal projects because the contractor’s labor costs and markup are not included in the tax base.
Shortly after the new statute was enacted, the United States sued the State in the District Court for the Western District of Washington, seeking a declaratory judgment and a permanent injunction against the assessment and collection of the sales tax from federal contractors, and an order requiring the refund of sales taxes already so collected, for which the United States had reimbursed its contractors. The District Court granted the United States’ motion for partial summary judgment, holding that the statutes discriminate against federal contractors in violation of the Supremacy Clause. On appeal, the Court of Appeals for the Ninth Circuit affirmed. 654 F. 2d 570 (1981). Washington appealed pursuant to 28 U. S. C. §1254(2), and we noted probable jurisdiction. 456 U. S. 970 (1982).
In recent years this Court has examined in some detail the history of the Federal Government’s constitutional immunity from state taxation. United States v. New Mexico, supra, at 730-738; United States v. County of Fresno, 429 U. S. 452, 457-464 (1977). There is no reason to repeat these discussions here; it suffices to restate our conclusions. In New Mexico, we explained that “immunity may not be conferred simply because the tax has an effect on the United States, or even because the Federal Government shoulders the entire economic burden of the levy. . . . Similarly, immunity cannot be conferred simply because the state tax falls on the earnings of a contractor providing services to the Government.” 455 U. S., at 734. In Fresno, we stated the rule that, “[s]o long as the tax is not directly laid on the Federal Government, it is valid if nondiscriminatory... or until Congress declares otherwise.” 429 U. S., at 460 (citing James v. Dravo Contracting Co., 302 U. S. 134, 150, 161 (1937)). Accord, Memphis Bank & Trust Co. v. Garner, 459 U. S. 392, 397 (1983).
[541]*541The United States’ principal argument is that the tax is invalid because Washington has circumvented the Federal Government’s tax immunity by identifying a federal activity for different tax treatment. Brief for United States 10, 21-31; Tr. of Oral Arg. 29-33, 40-41. Because Washington does not impose a sales tax on contractors who do not work for the Federal Government, the argument goes, it discriminates against the Federal Government and those with whom it deals.
Washington does, however, impose a sales tax on all purchases from contractors who do not deal with the Federal Government. The tax is imposed on every construction transaction, and the tax rate is the same for everyone. The only deviation from equality between the Federal Government and federal contractors on one hand, and every other taxpayer on the other, is that the former are taxed on a smaller proportion of the value of the project than the latter.4 Thus the Federal Government and federal contractors [542]*542are both better off than other taxpayers because they pay less tax than anyone else in the State. This hardly seems, on its face, to be the mistreatment of the Federal Government against which the Supremacy Clause protects.
The United States relies upon Phillips Chemical Co. v. Dumas Independent School District, 361 U. S. 376 (1960), in which Texas taxed the lessees of property owned by the State on the value of their leasehold interest, but taxed some lessees of property owned by the United States on the full value of the premises. However, the Court there rejected the United States’ argument that the tax was invalid simply because it treats those who deal with the Federal Government differently than it treats others.5 Id., at 382. We plainly stated that a determination whether a tax is discriminatory “requires ‘an examination of the whole tax structure of the state.’” Id., at 383 (quoting Tradesmens National Bank v. Oklahoma Tax Comm’n, 309 U. S. 560, 568 (1940)).6 The Texas tax was invalid only because it imposed “a heavier tax burden on lessees of federal property than is imposed on lessees of” state property.7 361 U. S., at 383, 387. See
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Justice Rehnquist
delivered the opinion of the Court.
The State of Washington’s principal source of revenue is a sales and use tax imposed on the buyer or consumer in all retail sales and consumer uses of tangible personal property.1 [538]*538In this case the United States contends that one aspect of that tax statute — its application to building construction — is invalid under the Supremacy Clause of the United States Constitution. The statutory provisions are most easily understood in light of their history.
Before 1941, building contractors were treated as consumers for sales tax purposes. All sales of tangible personal property, such as construction materials, to contractors were subject to the sales tax. The legal incidence of this tax was on the contractor; the tax was collected by suppliers who sold to contractors, and remitted by them to the State.
In 1941, Washington changed the sales tax system it applied to contractors by defining the landowner who purchases construction work from the contractor, rather than the contractor, as the “consumer.” The legal incidence of the tax was now on the landowner, who paid tax on the full price of the construction project. The net result was that contractors’ labor costs and markups were added to the tax base, which had previously included only the cost of tangible personal property sold to contractors.
The post-1941 tax system could not, however, be applied to construction for the Federal Government because the Supremacy Clause prohibits States from taxing the United States directly. United States v. New Mexico, 455 U. S. 720 (1982). Thus, when the United States was the landowner, Washington did not collect any tax on the sale either of tangible personal property to the contractor or of the finished building to the Government.
In 1975, the Washington Legislature acted to eliminate the complete tax exemption for construction purchased by the United States.2 It did so by reimposing the pre-1941 tax on [539]*539contractors that work for the Federal Government (“federal contractors”).3 Thus, Washington now taxes the sale of non-federal projects to the landowner, and taxes the sale of materials to federal contractors. The net result is that for federal projects the legal incidence of the tax falls on the [540]*540contractor rather than the landowner, and the tax is measured by a lesser amount than the tax on nonfederal projects because the contractor’s labor costs and markup are not included in the tax base.
Shortly after the new statute was enacted, the United States sued the State in the District Court for the Western District of Washington, seeking a declaratory judgment and a permanent injunction against the assessment and collection of the sales tax from federal contractors, and an order requiring the refund of sales taxes already so collected, for which the United States had reimbursed its contractors. The District Court granted the United States’ motion for partial summary judgment, holding that the statutes discriminate against federal contractors in violation of the Supremacy Clause. On appeal, the Court of Appeals for the Ninth Circuit affirmed. 654 F. 2d 570 (1981). Washington appealed pursuant to 28 U. S. C. §1254(2), and we noted probable jurisdiction. 456 U. S. 970 (1982).
In recent years this Court has examined in some detail the history of the Federal Government’s constitutional immunity from state taxation. United States v. New Mexico, supra, at 730-738; United States v. County of Fresno, 429 U. S. 452, 457-464 (1977). There is no reason to repeat these discussions here; it suffices to restate our conclusions. In New Mexico, we explained that “immunity may not be conferred simply because the tax has an effect on the United States, or even because the Federal Government shoulders the entire economic burden of the levy. . . . Similarly, immunity cannot be conferred simply because the state tax falls on the earnings of a contractor providing services to the Government.” 455 U. S., at 734. In Fresno, we stated the rule that, “[s]o long as the tax is not directly laid on the Federal Government, it is valid if nondiscriminatory... or until Congress declares otherwise.” 429 U. S., at 460 (citing James v. Dravo Contracting Co., 302 U. S. 134, 150, 161 (1937)). Accord, Memphis Bank & Trust Co. v. Garner, 459 U. S. 392, 397 (1983).
[541]*541The United States’ principal argument is that the tax is invalid because Washington has circumvented the Federal Government’s tax immunity by identifying a federal activity for different tax treatment. Brief for United States 10, 21-31; Tr. of Oral Arg. 29-33, 40-41. Because Washington does not impose a sales tax on contractors who do not work for the Federal Government, the argument goes, it discriminates against the Federal Government and those with whom it deals.
Washington does, however, impose a sales tax on all purchases from contractors who do not deal with the Federal Government. The tax is imposed on every construction transaction, and the tax rate is the same for everyone. The only deviation from equality between the Federal Government and federal contractors on one hand, and every other taxpayer on the other, is that the former are taxed on a smaller proportion of the value of the project than the latter.4 Thus the Federal Government and federal contractors [542]*542are both better off than other taxpayers because they pay less tax than anyone else in the State. This hardly seems, on its face, to be the mistreatment of the Federal Government against which the Supremacy Clause protects.
The United States relies upon Phillips Chemical Co. v. Dumas Independent School District, 361 U. S. 376 (1960), in which Texas taxed the lessees of property owned by the State on the value of their leasehold interest, but taxed some lessees of property owned by the United States on the full value of the premises. However, the Court there rejected the United States’ argument that the tax was invalid simply because it treats those who deal with the Federal Government differently than it treats others.5 Id., at 382. We plainly stated that a determination whether a tax is discriminatory “requires ‘an examination of the whole tax structure of the state.’” Id., at 383 (quoting Tradesmens National Bank v. Oklahoma Tax Comm’n, 309 U. S. 560, 568 (1940)).6 The Texas tax was invalid only because it imposed “a heavier tax burden on lessees of federal property than is imposed on lessees of” state property.7 361 U. S., at 383, 387. See Memphis Bank & Trust Co. v. Garner, supra, at 398.
[543]*543In United States v. County of Fresno, supra, the county imposed a tax on the owners of real property. Of course, property owned by the United States was exempt from the tax. Rather than forgo all revenue from federally owned, land, the county taxed private lessees’ interests in real property rented from the Federal Government and other tax-exempt owners.8 It did not tax the interests of any lessees of nonexempt property. We rejected the United States’ contention that the tax system discriminated against lessees of federal property. Because the economic burden of a tax imposed on the owner of nonexempt property is ordinarily passed on to the lessee, we explained that those who leased property from the Federal Government were no worse off than their counterparts in the private sector. 429 U. S., at 464-465.
Similarly, in United States v. City of Detroit, 355 U. S. 466, 473-474 (1958), Michigan taxed private property owners, but not the United States or other exempt owners. Instead, the State taxed nonexempt parties’ use of exempt property. It did not tax the use of nonexempt property. We upheld the tax because the State may “equate the tax burden imposed on private enterprise using exempt property with that carried by similar businesses using taxed property.”9 Id., at 473. We explained that “[tjhose using ex[544]*544empt property are required to pay no greater tax than that placed on private owners or passed on by them to their business lessees.” Id., at 473-474.
In this case, federal contractors are required to pay no greater tax than that placed on private buyers of construction work or passed on by them to their contractors. The Court of Appeals sought to distinguish Detroit on the ground that the tax burden in this case is not necessarily shifted to the nonfederal contractors. 654 F. 2d, at 576. But there was no proof in either Detroit or Fresno that private owners would necessarily pass the tax on to their lessees; the opportunity for the parties to allocate the economic burden of the tax among themselves was sufficient. No more should be required here.
The important consideration, therefore, is not whether the State differentiates in determining what entity shall bear the legal incidence of the tax, but whether the tax is discriminatory with regard to the economic burdens that result. The only difference between this case and Fresno and Detroit is that the taxpayer here is a vendor of services to the United States, rather than one who receives an economic benefit from the Federal Government. To rest upon this distinction would be to elevate form over substance. The entire trend of our decisions since James v. Dravo Contracting Co., 302 U. S. 134 (1937), has been to avoid “wooden formalism.” United States v. New Mexico, 455 U. S., at 737. See Fresno, 429 U. S., at 460-461, and n. 9. See generally Comment, Federal Immunity from State Taxation, 45 U. Chi. L. Rev. 695, 700-702 (1978). The State does not discriminate against the Federal Government and those with [545]*545whom it deals unless it treats someone else better than it treats them.10
The Court of Appeals thought that the Washington statutes do not provide a “political check against abuse of the taxing power,” Fresno, supra, at 463, because “there is no broad state constituency taxed as are the prime contractors who deal with the federal government.” 654 F. 2d, at 577. A “political check” is provided when a state tax falls on a significant group of state citizens who can be counted upon to use their votes to keep the State from raising the tax excessively, and thus placing an unfair burden on the Federal Government. It has been thought necessary because the United States does not have a direct voice in the state legislatures. See generally Fresno, swpra, at 458-459, and n. 6.
The Court of Appeals focused only on the taxes levied directly on contractors, and not on “ ‘the whole tax structure of the state.’” Phillips, 361 U. S., at 383 (quoting Trades-mens, 309 U. S., at 568). The tax on federal contractors is part of the same structure, and imposed at the same rate, as the tax on the transactions of private landowners and contractors. Indeed, the tax on contractors is part of a single sales tax scheme that is imposed at the same rate on every retail transaction in Washington; virtually every citizen is af[546]*546fected by the tax in the same way. As long as the tax imposed on those who deal with the Federal Government is an integral part of a tax system that applies to the entire State, there is little chance that the State will take advantage of the Federal Government by increasing the tax.11
In short, Washington has not singled out contractors who work for the United States for discriminatory treatment. It has merely accommodated for the fact that it may not impose a tax directly on the United States as the project owner. This the State may do without running afoul of the Supremacy Clause. As the Court stated in United States v. New Mexico, supra, at 737-738:
“If the immunity of federal contractors is to be expanded beyond its narrow constitutional limits, it is Congress that must take responsibility for the decision, by so expressly providing as respects contracts in a particular form, or contracts under particular programs. James v. Dravo Contracting Co., 302 U. S., at 161; Carson v. Roane-Anderson Co., 342 U. S. 232, 234 (1952). And this allocation of responsibility is wholly appropriate, for the political process is ‘uniquely adapted to accommodating the competing demands’ in this area. Massachusetts v. United States, 435 U. S. 444, 456 (1978) .... But absent congressional action, we have emphasized that the States’ power to tax can be denied only under ‘the clearest constitutional mandate.’ Michelin Tire Corp. v. Wages, 423 U. S. 276, 293 (1976).”12
The judgment of the Court of Appeals is
Reversed.