Intra-European Organization of Tax Administrations
http://www.iota-tax.orgNational Tax Board
http://www.skatteverket.se/Swiss Federal Tax Administration FTA
http://www.estv.admin.chMinistry of Finance of the Czech Republic
http://www.mfcr.czMinistry of Finance of the Republic of Croatia
http://www.porezna-uprava.hrState Tax Administration of the Finland
http://www.vero.fiNational Tax and Customs Administration (NAV) of Hungary
http://www.apeh.huInternal Revenue Service of the USA
http://www.irs.ustreas.govState Tax Administration of the Slovenia
http://www.durs.gov.siMinistry of Finance of the Slovak Republic
http://www.drsr.skInternal Revenue Service of the Germany
http://www.finanzamt.deTax and Customs Administration
http://www.belastingdienst.nl/Ministry of Finance of the Republic of Macedonia
http://www.ujp.gov.mkState Tax Inspectorate of the Republic of Lithuania
http://www.vmi.ltCanada Revenue Agency
http://www.ccra-adrc.gc.caTax Revenue of the Spain
http://www.aeat.esMinistry of Finance of the Israel
http://www.mof.gov.il/Estonian Tax and Customs Board
http://www.emta.eeTax, customs and duties in Denmark
http://www.skat.dkState Tax Administration of the Belgium
http://www.fiscus.fgov.beMinistry of Taxes of the Republic of Azerbaijan
http://taxes.gov.az/Australian taxation Office
http://www.ato.gov.au/