I've been looking at some lists of the top income-tax collecting countries in the world.
Investopedia's list basically included countries in Europe -- none in South America made the list. At the top of the list, Belgium collects 42 percent. You could look it up by googling: investopedia.com countries with highest income tax
Colombia is not on that list .. although I should mention that the list is only five countries long.
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The problem in Colombia is that theoretically the country taxes worldwide income. If you have been reading this forum, you know that this is scaring off some prospective Colombia Expats. Some years Colombia has taxed worldwide assets as well as worldwide income.
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After researching and discussing and following Colombia tax news for two years, I conclude that the country has done a pitiful job with making its tax-residents' obligations clear. The whole Reforma thing changes every year or two. There are loopholes .. but you can't necessarily find them without being able to research in Spanish-language legalese .. not just the law, but some bureaucratic interpretations of the finer points.
One tax attorney with whom I corresponded said he'd require at least nine hours of research at my cost of $100 US per hour to figure out my taxes.
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The best advice I can come up with is what Brother Archer and I have said before: If you're living in Colombia for more than 182 days out of 365 or are seriously considering a move here, consult multiple tax professionals. As Patrick Swayze memorably said in the first Roadhouse movie: Opinions vary.
cccmedia in Depto. de Nariño