| Country | Date of Treaty |
| Armenia | 12 Nov 2002 |
| Australia | 27 Dec 1989 |
| Austria | 1 Jul 1986 |
| Bahrain | 9 Jul 1998 |
| Bangladesh | 9 Jul 1998 |
| Belarus | 2 Sep 2006 |
| Belgium | 29 Dec 1980 |
| Bulgaria | 13 Feb 2001 |
| Canada | 16 Jul 1985 |
| Chile | 5 May 2010 |
| China | 29 Dec 1986 |
| Cyprus | 4 Apr 2000 |
| Czech Republic | 14 Aug 1995 |
| Denmark | 12 Feb 1999 |
| Estonia | 23 Dec 2013 |
| Finland | 26 Feb 1986 |
| France | 29 Aug 1975 |
| Germany | 4 Dec 1968 |
| Great Britain and Northern Ireland | 20 Nov 1981 |
| Hong Kong | 7 Dec 2005 |
| Hungary | 16 Oct 1989 |
| India | 5 Jan 2016 |
| Indonesia | 21 Oct 2003 |
| Ireland | 11 Mar 2015 |
| Israel | 24 Dec 1996 |
| Italy | 31 May 1980 |
| Japan | 30 Aug 1990 |
| Korea | 29 Jun 2007 |
| Kuwait | 25 Apr 2006 |
| Laos | 23 Dec 1997 |
| Luxembourg | 22 Jun 1998 |
| Malaysia | 2 Feb 1983 |
| Mauritius | 10 Jun 1998 |
| Myanmar | 15 Aug 2011 |
| Nepal | 14 Jul 1998 |
| Netherlands | 9 Jun 1976 |
| New Zealand | 14 Dec 1998 |
| Norway | 29 Dec 2003 |
| Oman | 27 Feb 2004 |
| Pakistan | 7 Jan 1981 |
| Philippines | 11 Apr 1983 |
| Poland | 13 May 1983 |
| Romania | 13 Apr 1997 |
| Russian | 15 Jan 2009 |
| Seychelles | 13 Mar 2006 |
| Singapore | 15 Feb 2017 |
| Slovenia | 4 May 2004 |
| South Africa | 27 Aug 1996 |
| Spain | 16 Sep 1998 |
| Sri Lanka | 12 Mar 1990 |
| Sweden | 26 Sep 1989 |
| Switzerland | 19 Dec 1996 |
| Chinese Taipei | 19 Dec 2012 |
| Tajikistan | 23 Dec 2013 |
| Turkey | 13 Jan 2005 |
| Ukraine | 27 Nov 2004 |
| United Arab Emirates | 28 Dec 2000 |
| United States of America | 15 Dec 1997 |
| Uzbekistan | 21 Jul 1999 |
| Vietnam | [No Date Available] |
Countries without Tax Treaties with Thailand:
| Country | Country | Country | Country |
|---|---|---|---|
| Afghanistan | Albania | Algeria | Andorra |
| Angola | Antigua and Barbuda | Argentina | Azerbaijan |
| Bahamas | Barbados | Belarus | Belize |
| Benin | Bhutan | Bolivia | Bosnia and Herzegovina |
| Botswana | Brazil | Brunei | Burkina Faso |
| Burundi | Cape Verde | Central African Republic | Chad |
| Colombia | Comoros | Congo (Brazzaville) | Congo (Kinshasa) |
| Costa Rica | Côte d'Ivoire | Croatia | Cuba |
| Djibouti | Dominica | Dominican Republic | East Timor |
| Ecuador | Egypt | El Salvador | Equatorial Guinea |
| Eritrea | Eswatini | Ethiopia | Fiji |
| Gabon | Gambia | Georgia | Ghana |
| Grenada | Guatemala | Guinea | Guinea-Bissau |
| Guyana | Haiti | Honduras | Iceland |
| Iran | Iraq | Israel | Jamaica |
| Jordan | Kazakhstan | Kenya | Kiribati |
| Kosovo | Kyrgyzstan | Lebanon | Lesotho |
| Liberia | Libya | Liechtenstein | Madagascar |
| Malawi | Maldives | Mali | Malta |
| Marshall Islands | Mauritania | Micronesia | Moldova |
| Monaco | Mongolia | Montenegro | Morocco |
| Mozambique | Namibia | Nauru | Nicaragua |
| Niger | Nigeria | North Macedonia | Palau |
| Palestine | Panama | Papua New Guinea | Paraguay |
| Peru | Qatar | Rwanda | Saint Kitts and Nevis |
| Saint Lucia | Saint Vincent and the Grenadines | Samoa | San Marino |
| Sao Tome and Principe | Saudi Arabia | Senegal | Serbia |
| Seychelles | Sierra Leone | Solomon Islands | Somalia |
| South Sudan | Sudan | Suriname | Syria |
| Tajikistan | Tanzania | Togo | Tonga |
| Trinidad and Tobago | Tunisia | Turkmenistan | Tuvalu |
| Uganda | Uruguay | Vanuatu | Vatican City |
| Venezuela | Yemen | Zambia | Zimbabwe |
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