On so many royal threads you continue to wilfully misunderstand the nature of trusts and how tax works in relation to the Duchies.
Creating a trust does not amount to “creating a business shell”. Trusts are generally used to hold private rather than business assets but private assets can include company shares, etc. The Duchies are not “capitalist corporations” as you put it. No individuals or Trusts ever pay Corporation Tax (as they are NOT corporations) so William and Charles are treated no differently here.
Not all trusts pay Inheritance Tax. The rules are complex (particularly for trusts set up pre 2006) and even those trusts that are liable to the ten year charge are entitled to Agricultural Property Relief, private residence relief and any other reliefs for qualifying assets in the same way as any individual.
The Duchies are more akin to Life Interest Trusts than Discretionary Trusts as the income of the trusts benefits a single individual, i.e. the heir or the Crown. Life Interest Trusts are not usually subject to income tax – the beneficiary who is entitled to receive the income is taxable instead. In the case of the Duchies, this would be William or Charles. This is completely normal.
Accordingly, William and Charles both pay income tax on their income from the Duchies after deductions for expenses for official purposes. Effectively they pay tax on income used for private purposes. Anyone, employed or self-employed is entitled to a deduction for expenses incurred in carrying out their job before paying tax. Once again, the royals are not treated any differently.
They are also liable to Capital Gains Tax in respect of the disposal of private assets and in respect of gains included in the private proportion of the Privy Purse.
Duchy accounts are available to the public (as are those of the Crown Estate) – they are not kept private so I have no idea what you are alluding to here. Only private assets not in the Duchies are kept private.
Both William and Charles are afforded the same level of privacy in tax matters as everyone else. Do you want them treated differently? Maybe you wish all individuals would open their tax affairs to the public or maybe just the wealthy ones? Should we all receive the same scrutiny?
The Royal’s tax affairs are all laid out very clearly in the Memorandum of Understanding on Royal Taxation already linked on this thread and yet you continue to spout nonsense – clearly your reading comprehension is seriously lacking. You are distorting facts to suit your own agenda.