There is speculation that wealthy tax payers find ways of avoiding it.
Downing Street has dismissed speculation that new council tax bands will be introduced to recoup more revenue from the wealthiest homeowners.
In addition, there is speculation that the proposed tax will not pass.
Premier Wen says a pilot property tax to stem speculation in Shanghai and Chongqing may be launched nationwide.
But there are lots of other storylines out there, including the announcement of CitiGroup massive layoffs, the ups and downs of the gold trade, and ongoing speculation on profit-taking for tax reasons versus performance chasing buying going into year-end.
As we know the germ of the idea is the Tobin Tax: specifically devised to stop speculation in the FX markets.
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Implement a Robin Hood Tax on Wall Street trading and speculation.
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The speculation is that Mr Bush will push for tax breaks for businesses and a tax rebate for individuals, but will not insist on extending his tax cuts.
The UK has already imposed a balance sheet tax on banks, but Europe is asking it to join them in imposing a tax on what is mainly investor speculation in an effort to raise revenue for cash strapped states in southern Europe.
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There has been speculation the government will unveil multi-billion pound tax breaks for low-income families, through the tax credit and winter fuel payment systems.
Which will be a great annoyance to some who have been campaigning for just this tax as they would like it to reduce commodity speculation.
Some observers have also suggested a tax on currency exchange, the so-called Tobin tax, to increase the cost of short-term speculation.
There is speculation that Romney might have engaged in Son of Boss deals or other sketchy tax shelter transactions.
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On Saturday, it emerged the government would not introduce a tax break for married couples in next month's Budget after speculation the measure would be brought in to appease Tory backbenchers opposed to gay marriage.
Singapore's government imposed the tax in December 2011 on most foreigners to fight what it contends is excessive speculation in the property market.
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Given that tax issues overhanging that pool of liquidity retained overseas are likely to daunt company treasurers, speculation swirled that borrowings could quickly mount to the tens of billions of dollars, versus no debt outstanding as of the end of March.
There has been unconfirmed speculation that the chancellor could outline the nature of the fiscal belt-tightening as 80% cuts and 20% tax rises.
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