The revenue or profit arising from stock naturally divides itself into two parts; that which pays the interest, and which belongs to the owner of the stock; and that surplus part which is over and above what is necessary for paying the interest.

This latter part of profit is evidently a subject not taxable directly. It is the compensation, and in most cases it is no more than a very moderate compensation, for the risk and trouble of employing the stock. The employer must have this compensation, otherwise he cannot, consistently with his own interest, continue the employment. If he was taxed directly, therefore, in proportion to the whole profit, he would be obliged either to raise the rate of his profit, or to charge the tax upon the interest of money; that is, to pay less interest. If he raised the rate of his profit in proportion to the tax, the whole tax, though it might be advanced by him, would be finally paid by one or other of two different sets of people, according to the different ways in which he might employ the stock of which he had the management. If he employed it as a farming stock in the cultivation of land, he could raise the rate of his profit only by retaining a greater portion, or, what comes to the same thing, the price of a greater portion of the produce of the land; and as this could be done only by a reduction of rent, the final payment of the tax would fall upon the landlord. If he employed it as a mercantile or manufacturing stock, he could raise the rate of his profit only by raising the price of his goods; in which case the final payment of the tax would fall altogether upon the consumers of those goods. If he did not raise the rate of his profit, he would be obliged to charge the whole tax upon that part of it which was allotted for the interest of money. He could afford less interest for whatever stock he borrowed, and the whole weight of the tax would in this case fall ultimately upon the interest of money. So far as he could not relieve himself from the tax in the one way, he would be obliged to relieve himself in the other.

The interest of money seems at first sight a subject equally capable of being taxed directly as the rent of land. Like the rent of land, it is a neat produce which remains after completely compensating the whole risk and trouble of employing the stock. As a tax upon the rent of land cannot raise rents; because the neat produce which remains after replacing the stock of the farmer, together with his reasonable profit, cannot be greater after the tax than before it: so, for the same reason, a tax upon the interest of money could not raise the rate of interest; the quantity of stock or money in the country, like the quantity of land, being supposed to remain the same after the tax as before it. The ordinary rate of profit, it has been shewn in the first book, is every where regulated by the quantity of stock to be employed in proportion to the quantity of the employment, or of the business which must be done by it. But the quantity of the employment, or of the business to be done by stock, could neither be increased nor diminished by any tax upon the interest of money. If the quantity of the stock to be employed therefore, was neither increased nor diminished by it, the ordinary rate of profit would necessarily remain the same. But the portion of this profit necessary for compensating the risk and trouble of the employer, would likewise remain the same; that risk and trouble being in no respect altered. The residue, therefore, that portion which belongs to the owner of the stock, and which pays the interest of money, would necessarily remain the same too. At first sight, therefore, the interest of money seems to be a subject as fit to be taxed directly as the rent of land.

There are, however, two different circumstances which render the interest of money a much less proper subject of direct taxation than the rent of land.

First, the quantity and value of the land which any man possesses can never be a secret, and can always be ascertained with great exactness. But the whole amount of the capital stock which he possesses is almost always a secret, and can scarce ever be ascertained with tolerable exactness. It is liable, besides, to almost continual variations. A year seldom passes away, frequently not a month, sometimes scarce a single day, in which it does not rise or fall more or less. An inquisition into every man’s private circumstances, and an inquisition which, in order to accommodate the tax to them, watched over all the fluctuations of his fortune, would be a source of such continual and endless vexation as no people could support.

Secondly, land is a subject which cannot be removed, whereas stock easily may. The proprietor of land is necessarily a citizen of the particular country in which his estate lies. The proprietor of stock is properly a citizen of the world, and is not necessarily attached to any particular country. He would be apt to abandon the country in which he was exposed to a vexatious inquisition, in order to be assessed to a burdensome tax, and would remove his stock to some other country where he could either carry on his business, or enjoy his fortune more at his ease. By removing his stock he would put an end to all the industry which it had maintained in the country which he left. Stock cultivates land; stock employs labour. A tax which tended to drive away stock from any particular country, would so far tend to dry up every source of revenue, both to the sovereign and to the society. Not only the profits of stock, but the rent of land and the wages of labour, would necessarily be more or less diminished by its removal.

The nations, accordingly, who have attempted to tax the revenue arising from stock, instead of any severe inquisition of this kind, have been obliged to content themselves with some very loose, and, therefore, more or less arbitrary estimation. The extreme inequality and uncertainty of a tax assessed in this manner, can be compensated only by its extreme moderation, in consequence of which every man finds himself rated so very much below his real revenue, that he gives himself little disturbance though his neighbour should be rated somewhat lower.

By what is called the land-tax in England, it was intended that stock should be taxed in the same proportion as land. When the tax upon land was at four shillings in the pound, or at one-fifth of the supposed rent, it was intended that stock should be taxed at one-fifth of the supposed interest. When the present annual land-tax was first imposed, the legal rate of interest was six per cent. Every hundred pounds stock, accordingly, was supposed to be taxed at twenty-four shillings, the fifth part of six pounds. Since the legal rate of interest has been reduced to five per cent. every hundred pounds stock is supposed to be taxed at twenty shillings only. The sum to be raised, by what is called the land-tax, was divided between the country and the principal towns. The greater part of it was laid upon the country; and of what was laid upon the towns, the greater part was assessed upon the houses. What remained to be assessed upon the stock or trade of the towns (for the stock upon the land was not meant to be taxed) was very much below the real value of that stock or trade. Whatever inequalities, therefore, there might be in the original assessment, gave little disturbance. Every parish and district still continues to be rated for its land, its houses, and its stock, according to the original assessment; and the almost universal prosperity of the country, which in most places has raised very much the value of all these, has rendered those inequalities of still less importance now. The rate too upon each district continuing always the same, the uncertainty of this tax, so far as it might be assessed upon the stock of any individual, has been very much diminished, as well as rendered of much less consequence. If the greater part of the lands of England are not rated to the land-tax at half their actual value, the greater part of the stock of England is, perhaps, scarce rated at the fiftieth part of its actual value. In some towns the whole land-tax is assessed upon houses; as in Westminster, where stock and trade are free. It is otherwise in London.

In all countries a severe inquisition into the circumstances of private persons has been carefully avoided.

At Hamburgh every inhabitant is obliged to pay to the state, one-fourth per cent. of all that he possesses; and as the wealth of the people of Hamburgh consists principally in stock, this tax may be considered as a tax upon stock. Every man assesses himself, and, in the presence of the magistrate, puts annually into the public coffer a certain sum of money, which he declares upon oath to be one-fourth per cent. of all that he possesses, but without declaring what it amounts to, or being liable to any examination upon that subject. This tax is generally supposed to be paid with great fidelity. In a small republic, where the people have entire confidence in their magistrates, are convinced of the necessity of the tax for the support of the state, and believe that it will be faithfully applied to that purpose, such conscientious and voluntary payment may sometimes be expected. It is not peculiar to the people of Hamburgh.

The canton of Underwald in Switzerland is frequently ravaged by storms and inundations, and is thereby exposed to extraordinary expences. Upon such occasions the people assemble, and every one is said to declare with the greatest frankness what he is worth, in order to be taxed accordingly. At Zurich the law orders, that, in cases of necessity, every one should be taxed in proportion to his revenue; the amount of which, he is obliged to declare upon oath. They have no suspicion, it is said, that any of their fellow-citizens will deceive them. At Basil the principal revenue of the state arises from a small custom upon goods exported. All the citizens make oath that they will pay every three months all the taxes imposed by the law. All merchants and even all inn-keepers are trusted with keeping themselves the account of the goods which they sell either within or without the territory. At the end of every three months they send this account to the treasurer, with the amount of the tax computed at the bottom of it. It is not suspected that the revenue suffers by this confidence.

To oblige every citizen to declare publicly upon oath the amount of his fortune, must not, it seems, in those Swiss cantons, be reckoned a hardship. At Hamburgh it would be reckoned the greatest. Merchants engaged in the hazardous projects of trade, all tremble at the thoughts of being obliged at all times to expose the real state of their circumstances. The ruin of their credit and the miscarriage of their projects, they foresee, would too often be the consequence. A sober and parsimonious people, who are strangers to all such projects, do not feel that they have occasion for any such concealment.

In Holland, soon after the exaltation of the late prince of Orange to the stadtholdership, a tax of two per cent. or the fiftieth penny, as it was called, was imposed upon the whole substance of every citizen. Every citizen assessed himself and paid his tax in the same manner as at Hamburgh; and it was in general supposed to have been paid with great fidelity. The people had at that time the greatest affection for their new government, which they had just established by a general insurrection. The tax was to be paid but once; in order to relieve the state in a particular exigency. It was, indeed, too heavy to be permanent. In a country where the market rate of interest seldom exceeds three per cent., a tax of two per cent. amounts to thirteen shillings and fourpence in the pound upon the highest neat revenue which is commonly drawn from stock. It is a tax which very few people could pay without encroaching more or less upon their capitals. In a particular exigency the people may, from great public zeal, make a great effort, and give up even a part of their capital, in order to relieve the state. But it is impossible that they should continue to do so for any considerable time; and if they did, the tax would soon ruin them so completely as to render them altogether incapable of supporting the state.

The tax upon stock imposed by the land-tax bill in England, though it is proportioned to the capital, is not intended to diminish or take away any part of that capital. It is meant only to be a tax upon the interest of money proportioned to that upon the rent of land; so that when the latter is at four shillings in the pound, the former may be at four shillings in the pound too. The tax at Hamburgh, and the still more moderate taxes of Underwald and Zurich, are meant, in the same manner, to be taxes, not upon the capital, but upon the interest or neat revenue of stock. That of Holland was meant to be a tax upon the capital.