Mr. Justice Van Devanter
delivered the opinion of the court.
This is an action to recover money paid under protest as a tax alleged to be forbidden by the Constitution.
The plaintiff is the United States District Judge for the Western District of Kentucky, and holds that office under an appointment by the President made in 1899 with the advice and consent of the Senate. The tax which he calls in question was levied under the Act of February 24, 1919, c. 18, 40 Stat. 1062, on his net income for the year 1918, as computed under that act. His compensation or salary as District Judge was included in the computation. Had it been excluded he would not have been called on to pay any income tax for that year. The inclusion was in obedience to a provision in § 213 requiring the computation to. embrace all gains, profits, income and the like, “including in the case ojf the President of the United States, the judges of the Supreme and inferior courts of the United States, [and others] . . . the compensation received as such.” Whether'he could be subjected to such a tax in [247]*247respect of his salary, consistently with the Constitution, is the matter in issue. If it be resolved against the tax he will be entitled to recover what he paid; otherwise his action must fail. It did fail in the District Court. 262 Fed. Rep. 550.
The Constitution establishes three great coordinate departments of the National Government, — the legislative, the executive, and the judicial, — and distributes-among them the powers confided to that Government by the people. Each department is dealt with in a separate Article, the legislative in the first, the executive in the second and the judicial in the third. Our present concern is chiefly with the third Article. It defines the judicial power, vests it in one supreme court and such inferior courts as Congress may from time to time ordain and establish, and declares: -"The Judges, both of the supreme and inferior Courts, shall hold their Offices during good Behaviour, and shall, at stated Times, receive for their Services, a Compensation, which shall not be diminished during their Continuance in Office. ”
The plaintiff insists that the provision in § 213 which subjects him to a-tax in respect of'his compensation as a judge by its necessary operation and effect diminishes that compensation and therefore is repugnant to the constitutional limitation just quoted.
Stated in its broadest aspect, the contention involves the power to tax the compensation of federal judges in general, — and also the salary of the President, as to which the Constitution (Art. II, § 1, cl. 6) contains a similar limitation. Because of the individual relation of the. members of this court to the question, thus broadly stated, we cannot but regret that its solution falls to us; and this although each member has been paying the tax in respect of his salary voluntarily and in regular course. But jurisdiction of the present case cannot be declined or renounced. The plaintiff was entitled by law to invoke our [248]*248decision on the question as respects his own compensation, in which no other judge can have any direct personal interest; and there was no other appellate tribunal to which under the law he could go. He brought the case here in due course, the Government joined him in asking an early determination of the question involved, and both have been heard at the bar and through printed briefs. In this situation, the only course open to us is to consider and decide the cause, — a conclusion supported by precedents reaching back many years. Moreover, it appears that, when this taxing provision was adopted, Congress regarded it as of uncertain constitutionality and both contemplated and intended that the question should be settled by us in a case like this.1
With what purpose does the Constitution provide that the compensation of the judges “shall not be diminished during their continuance in office”? Is it primarily to benefit the judges, or rather to promote the public weal by giving them that independence which makes for an impartial and courageous discharge of the judicial function? Does the provision merely forbid direct diminution, such [249]*249as expressly reducing the compensation from a greater to a less sum per year, and thereby leave the way open, for indirect, yet effective, diminution, such as withholding or calling back a part as a tax on the whole? Or, does it mean that the judge shall have a sure and continuing right to the compensation, whereon he confidently may rely for his support during his contiÜíknce in office, so that he need have no apprehension, lest his situation in this regard may be changed to his disadvantage?
The Constitution was framed on the fundamental theory that a larger measure of liberty and justice would be assured by vesting the three great powers, — the legislative, the executive, and the judicial, — in separate departments, each relatively independent of the others; and it was recognized that without this independence — if it was not made both real and enduring — the separation would fail of its purpose. All agreed that restraints and checks must be imposed to secure the requisite measure of independence; for otherwise the legislative department, inherently the strongest, might encroach on or even come to dominate the others, and the judicial, naturally the weakest, might be dwarfed or swayed by the other two, especially by the legislative.
The particular need for making the judiciary independent was elaborately pointed out by Alexander Hamilton in the Federalist, No. 78, from which we excerpt the following:
"The Executive not only dispenses the honors, but holds the sword of the community. The legislature not only commands the purse, but prescribes the rules by which the duties and rights of every citizen are to be regulated. The judiciary, on the contrary, has no influence over either the swor(3> or the purse; no direction either of the strength or of the wealth of the society; and can take no active resolution whatever. It may truly be said to have neither force nor will, but merely judgment,. . . . This simple view of [250]*250the matter suggests several important consequences. It proves incontestably, that the judiciary is beyond comparison the weakest of the three departments of power; that it can never attack with success either of the other two; and that all possible care is requisite to enable it to defend itself against their attacks. ”
“The complete independence of the courts of justice is peculiarly essential in a limited Constitution. By a limited Constitution, I understand one which contains certain specified exceptions to the'legislative authority; such, for instance, as that it shall pass no bills of attainder, no ex post facto laws, and the like. Limitations of this kind can be preserved in practice no other way than through the medium of courts of justice, whose duty it must be to declare all acts contrary to the manifest tenor of the Constitution void. Without this, all the reservations of particular rights or privileges would amount to nothing. ”
At a later period John Marshall, whose rich experience as lawyer, legislator, and Chief Justice enabled him to speak as no one else could, tersely said (Debates Va. Conv., 1829-1831, pp. 616, 619):
“Advert, Sir, to the duties of a Judge. He has to pass between the Government and the man whom that Government is prosecuting: between the most powerful individual in the community, and the poorest and most unpopular. It is of the last importance, that in the exercise of these duties, he should observe the utmost fairness. Need I press the necessity of this? Does not every man feel that his own personal security and the security of his property depends on that fairness? The Judicial Department comes home in its effects to every man’s fireside: it passes on his property, his reputation, his life, his all. Is it not, to the last degree important, that'he should be rendered perfectly and completely independent, with nothing to influence or control him but God and his conscience? ... I have always thought, from my earliest youth till now, that the [251]*251greatest scourge an angry Heaven ever inflicted upon an ungrateful and a sinning people, was an ignorant, a corrupt, or a dependent Judiciary.”
More recently the need for this independence was illustrated by Mr. Wilson, now the President, in the following admirable statement:
"It is also necessary that there should be a judiciary endowed with substantial and independent powers and' secure-.against all corrupting or perverting influences; secure, also/hgainsVihe arbitrary authority of the administrative heads oftfie government.
"Indeed there is a sense in which it may be said that the whole efficacy and reality of constitutional government resides in its courts. Our definition of liberty is that it is the best practicable adjustment between the powers of the government and the privileges of the individual.”
"Our courts are the balance-wheel of our whole constitutional system; and Ours is the only constitutional system so balanced and controlled. Other constitutional systems lack complete poise and certainty of operation because they lack the support and interpretation of authoritative, undisputable courts of law. It is clear beyond all need of exposition that for the definite maintenance of constitutional understandings it is indispensable, alike for the preservation of the liberty of the individual and for the preservation of the integrity of the powers of the government, that there should be some non-political forum in which those understandings can be impartially debated and determined. That forum our courts supply. There the individual may assert his rights; there the government must accept definition of its authority. There the individual may challenge the legality of governmental action and have it adjudged by the test of fundamental principles, and that test the government must abide; there the government can check the too aggressive self-assertion of the individual and establish its power upon lines which all [252]*252can comprehend and heed. The constitutional powers of the courts constitute the ultimate safeguard alike of individual privilege and of governmental prerogative. It is in this sense that our judiciary js the balance-wheel of our entire system; it is meant to maintain that nice adjustment between individual rights and governmental powers which constitutes political liberty.” Constitutional Government in the United States, pp. 17, 142.
Conscious of the nature and scope of the power being vested in the national courts, recognizing that they would be charged with responsibilities more delicate and important than any ever before confided to judicial tribunals, arid appreciating that they were to be, in the words of George Washington,1 “the keystone of our political fabric,” the Convention with unusual accord incorporated in the Constitution the provision that the judges “shall hold their offices during good behaviour, and shall, at stated times, receive for their services, a compensation, which shall riot be diminished during their continuance in office. ” Can there be any doubt that the two things thus coupled in place — the clause in respect of tenure during good behavior and that in respect of an undiminishable compensation — were equally coupled in purpose? And is it not plain that their purpose was to invest the judges with an independence in keeping with the delicacy and importance of their task and with the imperative need for its impartial and fearless perforrriance? Mr. Hamilton said in explanation and support of the provision (Federalist, No. 79): “Next to permanency in office, nothing can contribute more to the independence of the judges than á fixed provision for their support.' . . : . In the general course of human nature, a power over a man’s subsistence amounts to a power over his will. .... The enlightened, friends of good government in every State, have seen cause to lament the want of precise and explicit precautions in [253]*253the State constitutions on this head. Some of these indeed have declared that permanent salaries should be established for the judges; but the experiment has in some instances shown that such expressions are not sufficiently definite to preclude legislative evasions. Something still more positive and unequivocal has been evinced to be requisité. . . . This provision for the support of the judges bears every mark of prudence and efficacy; and it may be safely affirmed that, .together with the permanent tenure of their offices, it affords a better prospect of their independence than is discoverable in the constitutions of any of the States in regard to their own judges.” The several commentators on the Oonstitution have adopted and reiterated this view,1 2 — Judge Story adding: “Without this provision [as to an undiminishable compensation], the other, as to the tenure- of office, would haVe been utterly nugatory, and indeed a mere mockery”; and Chancellor Kent observing: “It tends, also, to secure a succession of learned men on the bench, who, in consequence of a certain undiminished support, are enabled and induced to quit the lucrative pursuits of private business for the duties of that important station.”
These considerations make it very plain, as we think, that the primary purpose of the prohibition against diminution was not to benefit the judges, but, like the clause in respect of tenure, to attract good and competent men to the -bench and to promote that independence of action and judgment which is essential to the maintenance of the guaranties, limitations and pervading principles of the Constitution and to the administration of justice without respect to persons and with equal concern for the poor and the rich. Such being its purpose, it is to be construed, not as a private grant, but as a limitation imposed in the public interest; in other words, not restrictively, but in [254]*254accord with its spirit and the principle on which it proceeds.
Obviously, diminution may be effected in more ways than one. Some may be direct and others indirect, or even evasive as Mr. Hamilton ■ suggested. But all which by their necessary operation and effect withhold or take from the judge a part of that which has been promised by law for his services must be regarded as within the prohibition. Nothing short of this will give full effect to its spirit and principle. Here the plaintiff was paid the full compensation, but was subjected to an involuntary obligation to pay back a part, and the obligation was promptly enforced. Of what avail to him was the part which was paid with one hand and then taken back with the other? Was he not placed in practically the same situation as if it had been withheld in the first instance? Only by subordinating substance to mere form could it be held that his compensation was not diminished. Of course, the conclusion that it was diminished is the natural one. This is illustrated in Dobbins v. Commissioners of Erie County, 16 Pet. 435, 450, which involved a tax charged under a law of Pennsylvania against a revenue officer of the United States who was' a citizen and resident of that State. The tax was adjusted or proportioned to his compensation, and the state court sustained it. 7 Watts, 513. In reversing that decision, this court, after showing that the compensation had been fixed by a law of Congress, said: "Does not a tax, then, by a state upon the office, diminishing the recompense, conflict with the law of the United States, which secures it to the officer in its entireness? It certainly has such an effect; and any law of a state imposing such a tax cannot be constitutional.”
But it is urged that what the plaintiff was made to pay back was an income tax, and that a like tax was exacted of others engaged in private employment.
If the tax in respect of his compensation be prohibited, [255]*255it can find no justification in the taxation of other income as to which there is no prohibition;, for, of course, doing what the Constitution permits gives no license to do what it prohibits.
The prohibition is general, contains no excepting words and appears to be directed against all diminution, whether for one purpose or another; and the reasons for its adoption, as publicly assigned at the time and commonly accepted ever since, make with impelling force for the conclusion that the fathers of the Constitution intended to prohibit diminution by taxation as well as otherwise,— that they regarded the independence of the judges as of far greater importance than any revenue that could come from taxing their salaries.
True, the taxing power is comprehensive and acknowledges few exceptions. But that there are exceptions, besides the one we here recognize and sustain, is well settled. In Collector v. Day, 11 Wall. 113, it was held that Congress could not impose an income tax in respect of the salary of a judge of a state court; in Pollock v. Farmers’ Loan & Trust Co., 157 U. S. 429, 585, 601, 652, 653, it was held — the full court agreeing on this point— that Congress was without power to impose such a tax in respect of interest received from bonds issued by a State or any of its counties or municipalities; and in United States v. Railroad Co., 17 Wall. 322, there was a like holding as to municipal revenues derived by the city of Baltimore from its ownership of stock in a railroad company. None of those decisions was put on any express prohibition in the Constitution, for there is none; but all recognized and gave effect to a prohibition implied from the independence of the States within their own spheres.
■ When we consider, as was done in those cases, what is comprehended in the congressional power to tax, — where its exertion is not directly or impliedly interdicted, — it becomes additionally manifest that, the prohibition now [256]*256under discussion was intended to embrace and prevent diminution through the exertion óf that power ; for, as this court repeatedly has held, the power to tax carries with it “the power- to embarrass and ddstroy”; may be applied to every object within its range “in such measure as Congress may determine”; enables that body “to select one calling and- omit another, to tax one class of property and to forbear to tax another”; and may be applied in.different ways to different objects so long as there is Vgeographical uniformity” in the duties, imposts and excises imposed. McCulloch v. Maryland, 4 Wheat. 316, 431; Pacific Insurance Co. v. Soule, 7 Wall. 433, 443; Austin v. The Aldermen, 7 Wall. 694, 699; Veazie Bank v. Fenno, 8 Wall. 533) 541, 548; Knowlton v. Moore, 178 U. S. 41, 92, 106; Treat v. White, 181 U. S. 264, 268-269; McCray v. United States, 195 U. S. 27, 61; Flint v. Stone Tracy Co., 220 U. S. 107, 158; Billings v. United States, 232 U. S. 261, 282; Brushaber v. Union Pacific R. R. Co., 240 U. S. 1, 24-26. Is it not therefore morally certain that the discerning statesmen who framed the Constitution andvwere so sedulously bent on securing the independence of the judiciary intended to protect the compensation of .the judges from assault and diminution in the name or form of a tax? Could not the purpose of the prohibition be wholly thwarted if this avenue of attack were left open? Certainly there is nothing in the words of the prohibition indicating that it is directed against one legislative power and not another; and in our. opinion due regard for its spirit and principle requires that it be taken as directed against them all.
This view finds support in rulings in Pennsylvania, Louisiana and North Carolina made under like constitutional restrictions, Commonwealth ex rel. Hepburn v. Mann, 5 Watts & Serg. 403, 415, et seq.;1 New Orleans v. Lea, 14 [257]*257La. Ann. 197; 48 N. Car. Appendix; N. Car. Public Documents 1899, Doc. No. 8, p. 95; 131 N. Car. 692; Purnell v. Page, 133 N. Car. 125, and has strong sanction in the actual practice of the Government, to which we now advert.
No attempt was made to tax the compensation of federal judges prior to 1862. A statute of that year, c. 119, § 86, 12 Stat. 472, with its amendments, subjected the salaries of all civil officers of the United States to an income tax of three per cent, and was construed by the revenue officers as including the compensation of the President and the judges. Chief Justice Taney, the head of the judiciary, wrote to the Secretary of the Treasury a letter of protest (157 U. S. 701), based on the prohibition we are considering, and in the course of the letter said:
“The act in question, as you interpret it, diminishes' the ompensation of every judge three per cent, and if it can oe diminished to that extent by the name of a tax, it may in the same way be reduced from time to time at the pleasure of the legislature.
“The Judiciary is one of the three great departments of the government, created and established by the Constitution. Its duties and powers are specifically set forth, and are of a character that requires'it to be perfectly independent of the two other departments, and in order to place it beyond the reach and above even the suspicion of any such influence, the power to reduce their compensation is expressly withheld from Congress, and excepted from their powers of legislation.
“Language could not be more plain than that used in [258]*258the Constitution.- It is moreover one of its most important and essential provisions. For the articles which limit the powers of the legislative and executive branches of the government, and those which provide safeguards for the protection of the citizen in his person and property, would be of little value without a judiciary to uphold and maintain them, which was free from every influence, direct or indirect, that might by possibility in times of political excitement warp their judgments.
“Upon these grounds I regard an act of Congress retaining in the Treasury a portion of the compensation of the judges, as unconstitutional and void. ”
The collection of the tax proceeded, and, at the suggestion of the Chief Justice, this court ordered his' protest spread on its records. In 1869 the Secretary of the Treasury referred the question to the Attorney General (Judge Hoar) and that officer rendered an opinion in substantial accord with Chief Justice Taney’s protest, and also advised that the tax on the President’s compensation was likewise invalid. 13 Ops. Atty. Gen. 161. The tax on the compensation of the President and the judges was then discontinued, and the amounts theretofore collected were all refunded, — a part through administrative channels and a part through the action of the Court of Claims and ensuing appropriations by- Congress. Wayne v. United States, 26 Ct. Clms. 274; c. 311, 27 Stat. 306. Thus the Secretary of the Treasury, the accounting officers, the Court of Claims and Congress accepted and gave effect to the view expressed by the Attorney General. In the Income Tax Act of 1894, c. 349, § 27, et seq., 28 Stat. 509, nothing was said about the compensation of the judges; but Mr. Justice Field regarded it as included and gave that as one reason for joining in the decision holding the act unconstitutional. 157 U. S'. 604-606. On the rehearing the Attorney General (Mr. Olney) frankly said in his brief: “There has never been a doubt since the opinion of Attorney General Hoar [259]*259that the salaries of the President and judges were exempt. ” The Income Tax Acts of 1913, 1916 and 1917 (c. 16, 38 Stat. 168; c. 463, 39 Stat. 758; c. 63, 40 Stat. 329) severally excepted the compensation of the judges then in office,— also that of the President for the then current term. In short, during a period of more than one hundred and twenty years there was but a single real attempt to tax the judges in respect of their compensation, and that attempt soon was disapproved and pronounced untenable by the concurring action of judicial, executive and legislative officers. And so it is apparent that in the actual practice of the Government the prohibition has been construed as embracing and preventing diminution by taxation.
Does the Sixteenth Amendment authorize and support this tax and the attendant diminution; that is to say, does it bring within the taxing power subjects theretofore excepted? The court below answered in the negative; and counsel for the Government say, “It is not, in view of recent decisions, contended that this Amendment rendered taxable as income' anything which was not so taxable before.” We might rest the matter here, but it seems better that our view and the reasons therefor be stated in this opinion, even if there be some repetition of what recently has been said in other cases.
Preliminarily we observe that, unless there be some real conflict-between the Sixteenth Amendment and the prohibition,, in Article III, § 1, making the compensation of the judges undiminishable, effect must be given to the latter as well as to the former; and also that a purpose to depart from or imperil a constitutional principle so widely esteemed and so vital to our system of government as the independence of the judiciary is not lightly to be assumed.
In Knowlton v. Moore, supra, p. 95, this court said: “The necessities which gave birth to the Constitution, the controversies which preceded its' formation, and the [260]*260conflicts of opinion which were settled by its adoption, may properly be taken into view for the purpose of tracing to its source any particular provision of the Constitution, in order thereby to be enabled to correctly interpret its meaning.” . This sound rule is as applicable to the Amendments as to the provisions of the original Constitution.
Let us turn then to the circumstances in which this Amendment was proposed and ratified and to the con-, troversy it was intended to settle. 'By the Constitution all direct taxes were required to be apportioned among the several States according to their population, as ascertained by. a census or enumeration (Art. I, § 2, cl. 3, and § 9, cl.-4), but no such requirement was imposed as to other taxes. And apart - from capitation taxes, with which we now are not concerned, no rule was given for determining what taxes were direct and therefore to be apportioned, or what were indirect and not within that requirement. Controversy ensued and ultimately centered around the right classification of income from taxable real estate and from investments in taxable personal- property. The matter then came before this court in Pollock v. Farmers’ Loan & Trust Co., 157 U. S. 429; 158 U. S. 601; and the decision when announced disclosed that the same differences in opinion existing elsewhere were shared by the members of the court, — five, the controlling number, regarding a tax on such income as in effect a direct tax on the property from which it.arose and therefore as requiring apportionment, and four regarding it as. indirect and not to be apportioned. Much of the law then under consideration had been framed according to the latter view and because of this and the adjudged inseparability of other portions the entire law was held invalid. Afterwards, to enable Congress to reach all taxable income more conveniently and effectively than would be possible as to much of it if an apportionment among the States wére essential, the Sixteenth [261]*261Amendment was proposed and ratified. In other words, the purpose of the Amendment was to eliminate all occasion for such an apportionment because of the source from which the income came, — a change in no wise affecting the power to tax but only the mode of exercising it. The message of the President1 recommending the adoption by Congress of a joint resolution proposing the Amendment, the debates 2 on the resolution by which, it was proposed, and the public appeals 3— -corresponding to those in the Federalist — made to secure its ratification leave no doubt on this point. And that the proponents of the Amendment in drafting it lucidly arid aptíy expressed this as its object is shown by its words:
“The Congress shall have power to lay and collect taxes on incomes, from whatever source derived, without apportionment among the several States, and without regard to any census or enumeration.”
True, Governor Hughes, of New York, in a message laying the Amendment before the legislature of that State for- ratification or rejection, expressed some apprehension lest it might be construed as extending the taxing power to income not taxable before; but his message promptly brought forth from statesmen who participated in proposing the Amendment such'convincing expositions of its purpose,4 as here stated, that the apprehension was effectively dispelled and ratification followed.
Thus the genesis and words of the Amendment unite in showing that it does not extend the taxing power to new or excepted subjects, but merely removes all occasion otherwise existing for an apportionment among the States of taxes laid on income, whether derived from one [262]*262source or another.1 And we have so held in other cases.
In Brushaber v. Union Pacific R. R. Co., 240 U. S. 1, where the purpose and effect of the Amendment were first drawn in question, the Chief Justice reviewed at length the legislative and judicial action which prompted its adoption and then, referring to its text and speaking for a unanimous court, said, pp. 17-18:
“It is clear on the face of this text that it does not purport to confer power to levy income taxes in a generic sense — an authority already possessed and never questioned — or to limit and distinguish between one kind of income taxes and another, but that the whole purpose of the Amendment was to relieve all income taxes when imposed from apportionment from a consideration of the source whence the income was derived. Indeed in the light of the history which we have given and of the decision in the Pollock Case and the ground.upon which the ruling in that case was based, there is no escape from the conclusion that the Amendment was drawn for the purpose of doing away for the future with the principle upon which the Pollock Case was decided,, that is, of determining whether a tax on income was direct not by a consideration of the burden placed on the taxed income upon which it directly operated, but by taking into view the burden which resulted on the property from which the income was derived, since in express terms the Amendment provides that income taxes, from whatever source [263]*263the income may be derived, shall not be subject to the regulation of apportionment.”
What was there said was reaffirmed and applied in Stanton v. Baltic Mining. Co., 240 U. S. 103, 112-113, and Peck & Co. v. Lowe, 247 U. S. 165, 172; and in Eisner v. Macomber, 252 U. S. 189,. decided at the present term, we again held, citing the prior cases, that the Amendment “did not extend the taxing power to new subjects, but merely removed the necessity which otherwise might exist for an apportionment among the States of taxes laid on income.”
After further consideration, we adhere to that view and accordingly hold that the. Sixteenth Amendment does not authorize or support the tax in question.
Apart from his salary, a federal judge is as much within the taxing power as other men are. If he has a home or other property, it may be taxed just as if it belonged to another. If he has an income other than his salary, it also may be taxed in the same way. And, speaking generally, his duties and obligations as a citizen are not different from those of his neighbors. ' But for the common good — to render him, in the words of John Marshall, “perfectly and completely independent, with nothing to influence or control him but God and his conscience”— his compensation is protected from diminution in any form, whether by a tax or otherwise, and is assured to him in its entirety for his support.
The court below concluded that the compensation was not diminished, and regarded this as inferable from our decisions in Peck & Co. v. Lowe, 247 U. S. 165,174-175, and United States Glue Co. v. Oak Creek, ibid. 321, 329. We think neither case tends to support that view. Each related to a business — one to exportation, the other to interstate commerce — which the taxing power — of Congress ia one case, of a State in the other — was restrained from directly burdening; and the holding in both was [264]*264that an income tax laid, - not on the gross receipts, but on the net proceeds remaining after all expenses were paid and losses adjusted, did not directly burden the business, but only indirectly and remotely affected "it. Here the Constitution expressly forbids diminution of the judge’s compensation, meaning, as we have shown, diminution by taxation as well as otherwise. The taxing act directs that the compensation — the full sum, with no deduction for expenses — be included in computing the net income, on which the tax is laid. If the compensation be the only income, the tax falls on it alone; and, if there be other income, the inclusion of the. compensation augments the tax accordingly. In either event the compensation suffers a diminution to the extent that it is taxed.
We conclude that the tax was imposed contrary to thé constitutional prohibition and so must be adjudged invalid.
Judgment reversed.