The Monetary Authority of Singapore(MAS), the central bank of Singapore, has just announced it would be regulating bitcoin activity treating it as a virtual commodity rather than as a virtual currency. Singapore currently has a 7% GST tax which is a consumption tax. As bitcoin is not a usual commodity, a strict implementation of GST cannot be applied. It is not expected that there will be bitcoin mining in Singapore. As there is no way to tell if a sales is local consumption (for which GST is specifically aimed at) or for export, I think the only reasonable way is a flat transaction tax, a sort of luxury tax or a 'warning' tax so that in the event when speculators got burnt when Bitcoin collapsed (When ?), the people won't complain and appeal to the government to direct the Bitcoin 'institutions' to indemnify them for losses - just as some over 65 people claimed they were stupid and ignorant when they incurred losses buying into Lehman brother's products. So the tax may be the same 7% as a start.
For industry players, there should be no implementation difficulties. Bitcoin exchanges could just absorb the 7% in their spread. But of course, business would run from regions with higher tax to region with lower sales tax. I doubt there need be any bitcoin havens with no tax. If there is the first country to tax bitcoin transactions, no sane government need ever ban bitcoin. Bitcoin in itself is no evil as simple regulations would ensure that money laundering would be easily controlled as with normal banking transactions. In fact bitcoin will evolved to be a good source of tax revenue if it trades at 650,000 USD/BTC - so why ban it!
Making Bitcoin taxable under a GST or VAT will never work for the very simple reason that Bitcoin will then become the perfect instrument to legally evade such a tax. This is the reason why the UK finally came to its senses over Bitcoin and VAT and Singapore will be forced to do the same. GST/VAT taxes only work because certain items are exempt. Among the exempt items wages,and money are a must. When considering money, anything that is used as money in the economy also needs to be exempt.
hahahahaha in the US, in some states, in some cities, there is not only a wage tax, there are upwards of 5 wage taxes, for example in NYC, you have the Social Security tax, the Federal Government Tax, the State Government Tax, The City Government tax, and the disability tax. Most cities in the US don't tax wages, and only a few states in the US don't tax wages, but NYC residents get taxed, taxed, taxed and taxed again -- oh, sales tax is 8.25% (state sales tax + city sales tax) ... with that said the USD is stonger in NYC than anyplace in the world, not because of the tax, but in spite of it