Mr. Chief Justice Hughes
delivered the opinion of the Court.
The Mountain States Telephone and Telegraph Company brought this suit to restrain the enforcement of two acts of the legislature of Montana imposing annual license taxes. The first act is Chapter 174 of the Laws of 1933 prescribing a tax, to be paid on or before January first, for each telephone instrument used in the conduct of the business of operating or maintaining telephone lines and furnishing telephone service in the State of Montana. The tax is not to be imposed on telephone instruments where the rate charged to the customer does not exceed specified monthly amounts. The second act, Chapter 54 of the Laws of 1933-34, amended the first act with respect. to the amount of the tax, the date of payment, and other particulars, and continued the first act in force as to taxes already accrued. The text of the acts is set forth in the margin.
The acts were assailed as repugnant to both the federal and state constitutions. One of these grounds, that the acts were invalid under the commerce clause of the Fed
eral Constitution, was sustained by the District Court of three judges (28 U. S. C. 380) which entered a final decree permanently enjoining enforcement. 7 F. Supp. 12. The defendants, state officers, bring this appeal.
The District Court received evidence and made findings of fact substantially as follows: Plaintiff is a Colorado corporation operating a statewide telephone system in Montana; it furnishes telephone service of an interstate and intrastate character; its system extends throughout Mon
tana, Idaho, Utah, Wyoming, Colorado, Arizona, New Mexico, and a part of Texas; its telephone instruments in Montana are an integral part of its system, and are a part of a still greater system extending throughout the United States and to many foreign countries, so that each of the telephones in Montana (except 45 not affected by the statute) is available for interstate and foreign communication by connection with many millions of telephones; the statute in question affects over 34,000 of the telephones in Montana, and, of these, more than 10,000 have actually been used in interstate and foreign commerce since the statute was enacted, and it is reasonably likely that all plaintiff’s telephone instruments in Montana will be so used; plaintiff pays the usual property taxes in Montana and also the corporation license or occupation taxes, which are a percentage of its intrastate revenues; all its telephones are instrumentalities of interstate and foreign commerce and plaintiff “ could not discontinue its intrastate business and operations in Montana without virtually destroying and being compelled to abandon and withdraw from its interstate and foreign business.”
Appellants contend that the taxes are imposed solely upon intrastate commerce and do not burden interstate commerce. They insist that the taxes are laid upon the intrastate business measured by the number of telephones in intrastate use. Appellants challenge the findings that all of appellee’s telephones in Montana are instrumentalities of interstate and foreign commerce, and that appellee could not discontinue its intrastate business without being compelled to withdraw from its interstate and foreign business, as being unsupported by the evidence.
1. It does not appear that these acts have been construed by any decision of the state courts. Appellants cite a decision of the Supreme Court of Montana construing § 4071 of the Political Code of 1895, as amended by the laws of 1897, p. 202, which provided for a tax on tele
phone companies doing business in the State of a certain amount per year for each instrument in use.
State
v.
Rocky Mountain Bell Telephone Co.,
27 Mont. 394; 71 Pac. 311. In view of the terms of that statute, the court concluded that the legislature intended to impose a license tax
“
on each telephone instrument used in purely local or intrastate business, and that as to instruments used in interstate business it was intended to have no application whatever.”
Id.,
p. 404. Compare
Ogden City
v.
Crossman,
17 Utah 66; 53 Pac. 985. A few days later, the Supreme Court of Montana decided the case of
State
v.
Northern Pacific Express Co.,
27 Mont. 419; 71 Pac. 404; and held that the occupation tax imposed by § 4074 of the Political Code of the State, as applied to an express company, offended against the commerce clause of the Federal Constitution. The court distinguished its ruling in the case of the
Rocky Mountain Bell Telephone Co.
because the statute there “ by express terms ” had discriminated “ between local and interstate commerce ” and the intention that “ only local business ” should be subject to the license tax “ was clearly expressed.” The court thus stated the principle which it considered to be applicable
(id.,
p. 422): “ If, however, the terms of the statute are general, and the license fee a unit charged against the business of the carrier as such,—as strictly an occupation tax,—and no attempt is made by the language of the statute to discriminate between the local and interstate business, but the license is required as a condition precedent to the carrier’s commencing or conducting business, then the imposition of the tax will be deemed an interference with and an attempt to regulate interstate commerce, and for that reason void.” Applying that principle, the court found the tax upon the express company to be invalid as the statute did not “ by its terms attempt to make any discrimination between the local and interstate business of the defendant company, ,and no such
discrimination can be made under any fair construction of the language employed.”
Id.,
p. 427. It is evident that these decisions of the state court do not aid appellants’ contention.
The tax is a privilege, or occupation, tax. The terms of the acts are explicit with respect to the incidence of the tax. Chapter 174 of the Laws of 1933 provides that every corporation
“
engaged in the business of operating or maintaining telephone lines and furnishing telephone service in the State of Montana . . . shall pay ... a license tax . . . for each telephone instrument used, controlled and operated by it in the conduct of such business.” The business is the maintaining of telephone lines and the furnishing of telephone service in the State. No distinction is made between interstate and intrastate service. The tax is then stated to be
“
for each telephone instrument used, controlled and operated.” Again, there is no limitation as to use, control or operation in intrastate business. The tax is “ based upon the number of telephone instruments owned, controlled and operated” during all or any part of the calendar year.
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Mr. Chief Justice Hughes
delivered the opinion of the Court.
The Mountain States Telephone and Telegraph Company brought this suit to restrain the enforcement of two acts of the legislature of Montana imposing annual license taxes. The first act is Chapter 174 of the Laws of 1933 prescribing a tax, to be paid on or before January first, for each telephone instrument used in the conduct of the business of operating or maintaining telephone lines and furnishing telephone service in the State of Montana. The tax is not to be imposed on telephone instruments where the rate charged to the customer does not exceed specified monthly amounts. The second act, Chapter 54 of the Laws of 1933-34, amended the first act with respect. to the amount of the tax, the date of payment, and other particulars, and continued the first act in force as to taxes already accrued. The text of the acts is set forth in the margin.
The acts were assailed as repugnant to both the federal and state constitutions. One of these grounds, that the acts were invalid under the commerce clause of the Fed
eral Constitution, was sustained by the District Court of three judges (28 U. S. C. 380) which entered a final decree permanently enjoining enforcement. 7 F. Supp. 12. The defendants, state officers, bring this appeal.
The District Court received evidence and made findings of fact substantially as follows: Plaintiff is a Colorado corporation operating a statewide telephone system in Montana; it furnishes telephone service of an interstate and intrastate character; its system extends throughout Mon
tana, Idaho, Utah, Wyoming, Colorado, Arizona, New Mexico, and a part of Texas; its telephone instruments in Montana are an integral part of its system, and are a part of a still greater system extending throughout the United States and to many foreign countries, so that each of the telephones in Montana (except 45 not affected by the statute) is available for interstate and foreign communication by connection with many millions of telephones; the statute in question affects over 34,000 of the telephones in Montana, and, of these, more than 10,000 have actually been used in interstate and foreign commerce since the statute was enacted, and it is reasonably likely that all plaintiff’s telephone instruments in Montana will be so used; plaintiff pays the usual property taxes in Montana and also the corporation license or occupation taxes, which are a percentage of its intrastate revenues; all its telephones are instrumentalities of interstate and foreign commerce and plaintiff “ could not discontinue its intrastate business and operations in Montana without virtually destroying and being compelled to abandon and withdraw from its interstate and foreign business.”
Appellants contend that the taxes are imposed solely upon intrastate commerce and do not burden interstate commerce. They insist that the taxes are laid upon the intrastate business measured by the number of telephones in intrastate use. Appellants challenge the findings that all of appellee’s telephones in Montana are instrumentalities of interstate and foreign commerce, and that appellee could not discontinue its intrastate business without being compelled to withdraw from its interstate and foreign business, as being unsupported by the evidence.
1. It does not appear that these acts have been construed by any decision of the state courts. Appellants cite a decision of the Supreme Court of Montana construing § 4071 of the Political Code of 1895, as amended by the laws of 1897, p. 202, which provided for a tax on tele
phone companies doing business in the State of a certain amount per year for each instrument in use.
State
v.
Rocky Mountain Bell Telephone Co.,
27 Mont. 394; 71 Pac. 311. In view of the terms of that statute, the court concluded that the legislature intended to impose a license tax
“
on each telephone instrument used in purely local or intrastate business, and that as to instruments used in interstate business it was intended to have no application whatever.”
Id.,
p. 404. Compare
Ogden City
v.
Crossman,
17 Utah 66; 53 Pac. 985. A few days later, the Supreme Court of Montana decided the case of
State
v.
Northern Pacific Express Co.,
27 Mont. 419; 71 Pac. 404; and held that the occupation tax imposed by § 4074 of the Political Code of the State, as applied to an express company, offended against the commerce clause of the Federal Constitution. The court distinguished its ruling in the case of the
Rocky Mountain Bell Telephone Co.
because the statute there “ by express terms ” had discriminated “ between local and interstate commerce ” and the intention that “ only local business ” should be subject to the license tax “ was clearly expressed.” The court thus stated the principle which it considered to be applicable
(id.,
p. 422): “ If, however, the terms of the statute are general, and the license fee a unit charged against the business of the carrier as such,—as strictly an occupation tax,—and no attempt is made by the language of the statute to discriminate between the local and interstate business, but the license is required as a condition precedent to the carrier’s commencing or conducting business, then the imposition of the tax will be deemed an interference with and an attempt to regulate interstate commerce, and for that reason void.” Applying that principle, the court found the tax upon the express company to be invalid as the statute did not “ by its terms attempt to make any discrimination between the local and interstate business of the defendant company, ,and no such
discrimination can be made under any fair construction of the language employed.”
Id.,
p. 427. It is evident that these decisions of the state court do not aid appellants’ contention.
The tax is a privilege, or occupation, tax. The terms of the acts are explicit with respect to the incidence of the tax. Chapter 174 of the Laws of 1933 provides that every corporation
“
engaged in the business of operating or maintaining telephone lines and furnishing telephone service in the State of Montana . . . shall pay ... a license tax . . . for each telephone instrument used, controlled and operated by it in the conduct of such business.” The business is the maintaining of telephone lines and the furnishing of telephone service in the State. No distinction is made between interstate and intrastate service. The tax is then stated to be
“
for each telephone instrument used, controlled and operated.” Again, there is no limitation as to use, control or operation in intrastate business. The tax is “ based upon the number of telephone instruments owned, controlled and operated” during all or any part of the calendar year. A “ telephone instrument ” is defined in section two of the act as “ a transmitter and receiver capable of use in the transmitting and receiving of telephone communications.” The tax is thus laid simply by reason of the fact that the company is furnishing telephone service and is based upon the number of telephone instruments used in that service without regard to its character whether intrastate or interstate. The provision of the second tax act, Chapter 54 of the Laws of 1933-34, is in this respect substantially the same.
To support their contention, appellants point to the proviso, in the first act, that the tax
“
shall not be imposed on any telephone instrument where the rate charged the customer therefor does not exceed Two Dollars ($2.00) per month for residence phone, or Three Dollars ($3.00) per month for business house or office phone.” There is a cor
responding exclusion in the second act.
But these are merely exempting provisions. They carve out of the statute telephone instruments for which certain monthly rates are paid. The question is not as to the instruments that are not taxed, but as to those which are taxed. All the telephone instruments, not excepted, whether they are used in intrastate or interstate commerce and however the service is paid for, are left subject to the tax. It is urged that monthly rates are charged to the customer for merely local service and are distinct from toll rates or charges for long distance calls which, whether intrastate or interstate, are on a
“
board to board ” basis. But the tax is not laid on revenues. It is not laid on revenue derived from monthly rates as distinguished from toll charges. It is not imposed with respect either to the nature of the revenue, or to the character of the service from which the revenue is derived, or to the manner in which the charges for the service are fixed.
The evidence supports the findings that these telephone instruments are available for interstate and foreign communications. Appellants contend that a “ potential use, or even an occasional use for interstate or foreign commerce, is too remote, indefinite and indirect to permit such instruments to be classified as instrumentalities of interstate or foreign commerce, when, in fact, such instruments are used exclusively or almost exclusively for intrastate commerce.” But the telephone instruments constitute a class of facilities, which, as such, are subject to the tax, and the findings, based on evidence, show that the interstate use is actual, not merely potential; substantial, not negligible. More than 10,000 of these instruments have actually been used in interstate and foreign commerce since the tax was laid. The evidence also shows that the same telephones, the same signaling apparatus, the same
wires, land, buildings, central office equipment, and operating organization are used in common for all services, interstate as well as intrastate. It was in this view that the District Court held that it was not feasible to provide separate statewide systems for intrastate and interstate telephones. But, apart from that question, it appears that in the operation of this unified system, the telephone instruments are the means by which the customers command at their pleasure the service they desire whether intrastate or interstate. And, so far as the instruments are not excepted, the tax is laid indiscriminately with respect to each of these facilities, regardless of the nature of their use.
2. There is no question that the State may require payment of an occupation tax from one engaged in both intrastate and interstate commerce.
But a State cannot tax interstate commerce; it cannot lay a tax upon the business which constitutes such commerce or the privilege of engaging in it.
And the fact that a portion of a business is intrastate and therefore taxable does not justify a tax
either upon the interstate business or upon the whole business without discrimination.
Leloup
v.
Mobile,
127 U. S. 640. There are “ sufficient modes ” in which the local business may be taxed without the imposition of a tax “which covers the entire operations.”
Id.,
p. 647. See
Williams
v.
Talladega,
226 U. S. 404, 419. Where the tax is exacted from one doing both an interstate and intrastate business, it must appear that it is imposed solely on account of the latter; that the amount exacted is not increased because of the interstate business done; that one engaged exclusively in interstate commerce would not be subject to the tax; and that the one who is taxed could discontinue the intrastate business without also withdrawing from the interstate business.
Sprout
v.
South Bend,
277 U. S. 163, 171;
East Ohio Gas Co.
v.
Tax Commission,
283 U. S. 465, 470.
A privilege or occupation tax which a State imposes with respect to both interstate and intrastate business, through an indiscriminate application to instrumentalities common to both sorts of commerce, has frequently been held to be invalid.
Leloup
v.
Mobile, supra; Pickard
v.
Pullman Southern Car Co.,
117 U. S. 34, 46;
Crutcher
v.
Kentucky,
141 U. S. 47, 59;
Adams Express Co.
v.
New York,
232 U. S. 14, 29, 31;
United States Express Co.
v.
New York,
232 U. S. 35, 36;
Bowman
v.
Continental Oil Co.,
256 U. S. 642, 647, 648. In the cases of the express companies, the principle was applied to a privilege tax imposed alike with respect to wagons used in the movement of both interstate and intrastate shipments. The local shipments “were handled in the same vehicles, and by the same men ” that were employed in connection with the interstate transportation and it was impracticable to effect a separation.
Adams Express Co.
v.
New York, supra; United States Express Co.
v.
New York, supra.
In
Bowman
v.
Continental Oil Co., supra,
the question arose under a statute of New Mexico’ laying an annual license tax of
fifty dollars for each station distributing gasoline. The Court pointed out the distinction between an excise tax on sales of gasoline where, as the subject matter was separable, full protection could be afforded by enjoining enforcement as to the interstate business, and the license tax which with its prohibition fell upon the business as a whole. The Court said: “ But with the license tax it is otherwise. If the statute is inseparable, then both by its terms and by its legal operation and effect this tax is imposed generally upon the entire business conducted, including interstate commerce as well as domestic; and the tax is void.” The difficulty, continued the Court, “ is that, since plaintiff, so far as appears, necessarily conducts its interstate and domestic commerce in gasoline indiscriminately at the same stations and by the same agencies, the license tax cannot be enforced at all without interfering with interstate commerce unless it be enforced otherwise than as prescribed by the statute—that is to say, without authority of law. Hence, it cannot be enforced at all.”
In the instant case, the tax, being indivisible and indiscriminate in its application, necessarily burdens interstate commerce. We do not pass upon the other questions presented. .
Decree affirmed.