I replied to GP with the same thought as you, but I think there might be some merit in the "loan" angle.
Lets look at the case that you operate as a consultant/contractor/etc. Your "startup" starts making some very large revenue, and you'd like to use that money to pay rent, go on vacation, pay for surgery, etc.
Any money (say, $amount) the business pays on your behalf (hospital, landlord, etc) is considered your personal income and taxed appropriately.
But, if the books reflect that it was given as a loan, and you are now on the books as a debtor (with the business being your creditor), then that specific $amount isn't taxed as your personal income (loans aren't considered income, as far as I know, because they are a liability).
So, as long as you are in control of the business, the business doesn't need to initiate the "pay back now or we start legal proceedings" process. What instead happens is that this loan amount in the business books just grows and grows (interest accumulates) until the business dies/ends/is sold without ever collecting on it.
As long as the business itself does not have outstanding creditors when it eventually comes to an end, that "loan" can be just written off.
What's the revenue service going to do? Claim that businesses can't write off debt anymore?
Unfortunately this doesn't work for individuals: tax codes in, well, every first world jurisdiction, are very clear that any money going to an individual for their exclusive use is taxed.
I operate as a consultancy (registered tax-paying business); If I use my revenue to pay my bond or get surgery, that $amount is considered personal income even if the company pays for it.[1]
The real problem is that corporations are taxed on profit and individuals are taxed on revenue!
All the costs that a corporation has to foot just to remain in existence is tax-deductible. All the costs that an individual has to foot to remain in existence is taxed (double-taxed, in some cases).
A corporation that pays $amount for rent won't pay tax on $amount in income, while an individual who pays $amount in rent is taxed on the $amount in income.
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[1] I hear what you are saying about a loan that is paid back, and maybe that is one loophole I can explore, but the revenue services have seen all "hacks" and this is no doubt one of them. This is why the tax codes are so complex and convoluted - each time a hack is discovered, a new code is added to specifically shutdown that loophole. The only remaining "hacks" are those that are allowed anyway by the overall tax policy, like "individuals are taxed on all revenue, corporates are taxed on profits only"