Taxes on business, particularly big business, are a favorite of many progressive politicians and their supporters. It’s appealing to burden large, rich companies with the bill to pay for progressive social programs. Businesses don’t vote, they are difficult to humanize, and they some really do have deep pockets. But this impulse is wrong, it is anti-progressive, and it hides a form of regressive taxation.
Taxing businesses will lead to lower wages for workers, and that decrease in wages will be greater for those with the least power within the business. Prices will increase for consumers of the business’ goods or services will increase, again with goods and services catering to the most dispensable sectors being increased more. These increases will tend to burden the poor more than the rich, so that however much they fund progressive programs, they will exacerbate the very problems these programs seek to address.
This is speculative, and that highlights what may be the worst aspect of business taxes: when businesses are taxed, it is not clear how businesses respond. We can get an idea by e.g. looking at changes in the corporate tax rate and seeing how prices and pay rates change in response. But this method will always be imperfect, and some measure of the real burden of taxes felt by different segments of the population will be hidden.
At least two arguments in favor of business taxes are worth addressing:
First, businesses as businesses enjoy some rights, and they should pay for them. Businesses as legal entities can own property; they have access to the police and the courts; they insulate their owners from liability; in some places they may even have the right to lobby government and to affect politics. The response to this is that most of those rights in fact protect the interests of the owners of the business, and a tax on income will account for income dependent upon those protections. Other rights are rights that we probably don’t want to give to companies, but to their owners, and taxing the company gives credibility to the idea that the company should have the right to represent itself in e.g. politics.
Second is more pragmatic: businesses are cheaper to tax because there are fewer of them; even if we’re already taxing individuals, it makes sense to have a large share of tax revenue come from businesses, because it’s cheaper to verify their accounting and thus takes importance off individual tax returns (so we could be sloppier or more forgiving). This doesn’t necessarily seem to be the case: businesses accounts can be much more complex than individual accounts. Similarly, their attempts to avoid taxes are likely to be much more sophisticated and effective as a result. Finally, there are likely to be other cheap ways to tax that do not have the same pitfalls as business taxes. For example, taxes that are paid by businesses but that are not taxes on businesses (for example, a business would still pay a land-value tax for any land of which it was the legal owner).
Because they are likely to be regressive in their ultimate effect on society, and because their existence masks the real tax rate felt by all members of society and thus stymies conscientious, progressive tax policies, taxing businesses is likely to be anti-progressive. Supporting them is a mistake that too many progressives make.