If you live in Texas and need to sell, transfer, or mortgage property in Vietnam, you will likely need a power of attorney so someone in Vietnam can act for you. Vietnam is in the middle of an important transition. It has acceded to the Hague Apostille Convention, but the apostille only becomes usable there on September 11, 2026. Until that date, a Texas document still requires the older, longer consular legalization chain. Which path applies to you depends on your timing.
What an apostille is
An apostille is a certificate that authenticates a public document — a notary's signature, a court seal, a registrar's certification — so it will be accepted by authorities in another country. For countries in the Hague Apostille Convention, the apostille is the finish line. For countries outside it, the same Texas certificate is the first step in a short legalization chain.
Does an apostille work in Vietnam?
Not yet, but soon. Vietnam has acceded to the Hague Apostille Convention, and an apostille will be accepted there starting September 11, 2026. Before that date, a Texas power of attorney must go through full consular legalization, not an apostille.
Before September 11, 2026 (legalization chain):
- Notarize the power of attorney before a Texas notary.
- Obtain a U.S. Department of State authentication certificate.
- Legalize the document at a Vietnamese embassy or consulate.
- In Vietnam, translate it into Vietnamese and have the translation notarized there.
On or after September 11, 2026: a single apostille from the Texas Secretary of State replaces the Department of State and consular legalization steps. You will still need a Vietnamese translation.
How the Texas Secretary of State apostille works
Texas apostilles come from a single office: the Secretary of State's Authentications Unit in Austin. There is no county-clerk step — a document notarized by any Texas notary, in any of the 254 counties, goes straight to the state. Since October 2023 Texas issues one (Form 2102) that works for every destination, whether or not the country belongs to the Hague Apostille Convention.