SD Global Documents and Resources

Accounting

Financial Accounting Standards Board
Japanese Institute of CPAs
International Financial Reporting Standards (IFRS)

U.S. Tax and Treasury

US Treasury Reporting Rate of Exchange 
US IRS 
US Social Security
US Customs/Duty tax 
Income Tax Treaties

Foreign Tax and Treasury Authorities

Japanese Ministry of Finance
Canada Revenue Agency 
India Tax 
United Kingdom Inland Revenue 
China Tax
Australian Taxation

Other helpful links for international business:

US Department of State- Country Pages
World Time Zones
European Union Website
Organisation for Economic Cooperation and Development (OECD) 
Foreign Exchange Rates