Taxes by country, tax evasion, filing time

https://en.wikipedia.org/wiki/List_of_countries_by_tax_rates
https://en.wikipedia.org/wiki/List_of_countries_by_tax_revenue_as_percentage_of_GDP

https://en.wikipedia.org/wiki/Tax_evasion
http://investorplace.com/investorpolitics/10-worst-countries-for-tax-evasion/#.VxDwvtIrKHs

http://fivethirtyeight.com/features/everyone-files-their-taxes-at-the-last-minute/