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Why doesn’t every company and individual use tax-havens to pay less taxes?
However, if you are employed by a company that exists in a tax haven and your services are provided to an employer by that tax haven company, it is the tax haven company that gets paid, not you. Under various schemes that company need not pay you at all. For example it may make you a loan which is not taxed (ie you don't pay tax on a loan, just as you don't pay tax on the money lent you by a mortgage company). You are bound by the terms of the loan agreement to repay that loan at a rate that the company finds acceptable. Indeed the company may find eventually that it is simply convenient to write off the loan as unrecoverable. if the owners/officers of he company write off your loans, how much tax will you have paid on the money you have had as   loans? The taxman can of course state that this was simply set up to avoid tax (which is illegal) so you should have a balancing scheme to show that that the loans were taken to supplement income,just as one might take a bank loan / mortgage, not replace it entirely as a tax scam. Hiring tax counsel to provide this adequate proof to HMRC has a price.  Frequently this kind of loophole exists because the number of people using it were sufficiently low not to warrant policing ( if the policing costs more than the tax recovered, then it is more efficient to ignore it) or because at some stage the scheme has been perfectly legal (as in the old offshore'education' trust recommended by the government a few decades ago). When Gordon Brown set out a 75% tax rate (for his possibly ideological reasons rather than financially based ones)for those who had these accounts , he encountered opposition from MPs who were going to be caught up paying high tax bills for what was effctively retrospective taxation, so there was a built in 'loophole' to allow the funds to be returned without undue penalty.  If you think that is morally wrong, consider what the response would be if a future Chancellor was to declare all IAs the work of the devil and claim that retrospective tax would need to be paid on all ISA transactions over the last few decades.eg: tot up all the dividends and capital gains made on an ISA in any year and pay 40% tax on all of them, even if that took the ISA into negative territory because the value today was low/ underperfoming. Yet this has been sggested as a way of filling in the hole in the budget on the grounds that anyone with an ISA can be represented as 'rich' to a selected party of voters.