How to Apply for an ITIN from Vietnam (2026)

To apply for an ITIN from Vietnam, you file IRS Form W-7 with a certified copy of your passport, attached to a US tax return or a qualifying exception. Three offices can certify that passport copy: an IRS Certifying Acceptance Agent working online, the Immigration Department (Cục Quản lý xuất nhập cảnh) that issued the passport, or the US Embassy in Hanoi and the US Consulate General in Ho Chi Minh City. You do not need to travel to the United States, and you do not need a US visa. Here is what most guides get wrong, and it is two things. First, Vietnam signed an income tax treaty with the US back in 2015, but it was never ratified in Washington, so the flat 30% withholding on US dividends and royalties still applies, and no ITIN changes that. Second, the typical Vietnamese applicant today is not a student or a landlord. It is a cross-border seller with a US LLC, and for that founder the ITIN arrives at a very specific moment in the paperwork chain. This guide covers both, plus the spouse filing that quietly drives the biggest refunds.

The Vietnamese-American story is one of the largest migration stories in the US. More than 1.3 million Vietnamese immigrants live in the United States, the sixth-largest immigrant group in the country, with a third concentrated in greater Los Angeles, San Jose, and Houston (Migration Policy Institute). Orange County's Little Saigon is the cultural capital, but the tax stories now run in both directions. Remittances to Vietnam reached about $16 billion in 2024, with Ho Chi Minh City alone expecting around $10.5 billion in 2025.

And the traffic is no longer just family money moving west to east. A generation of sellers in Ho Chi Minh City, Hanoi, and Da Nang now earns dollars directly from American customers, through Amazon storefronts, print-on-demand shops, and US LLCs registered from a laptop. That is the community this guide is really for, along with the Vietnamese spouses of US citizens who need an ITIN for a very different reason. Both groups run into the same three walls: a treaty that exists on paper but not in law, a local tax number the IRS has never heard of, and a country with no one authorized to certify a passport copy for the IRS. Here is how to get through all three.

Vietnam's US Tax Treaty Was Signed in 2015. It Still Isn't in Force.#

This is the fact that reshapes every Vietnamese ITIN application, and almost nobody explains it straight. On July 7, 2015, the United States and Vietnam signed their first-ever income tax treaty. Vietnam's National Assembly ratified it in early 2017. The US Senate never did. Then the 2017 US tax reform rewrote the very corporate rules the treaty text relied on, leaving the signed document out of step with US law and stuck in renegotiation ever since.

The file is not dead. In May 2025, tax officials from both governments held technical talks on the double taxation agreement on the sidelines of the SelectUSA Summit, co-chaired by Vietnam's General Department of Taxation and the US Treasury. But talks are not law. As of 2026, Vietnam does not appear on the IRS list of countries with income tax treaties in force. Look under "V" and you find Venezuela, not Vietnam. Meanwhile Vietnam holds double tax agreements with around 80 other countries. The United States, its largest export market, is the one major trading partner missing from that list.

What does that cost you in practice? When a US payer sends dividends, interest, or royalties to a nonresident, the default withholding is a flat 30%, unless a treaty says otherwise. The form for claiming a lower rate is the W-8BEN, and it asks you to name the treaty article you rely on. A Vietnamese resident has no article to cite. Here is what the signed-but-unratified treaty would have delivered, next to what actually happens:

So be suspicious of anyone selling an ITIN as a withholding fix. The ITIN is a filing, compliance, and identity key. It lets you submit a return, reclaim genuinely over-withheld tax, appear on a joint return, and satisfy US banks and platforms. It does not touch the 30%. Readers comparing across the region can see the contrast in our Thailand, Indonesia, and Philippines guides: the Philippines has a treaty in force, Thailand does too, and Vietnam, for now, does not.

Why Vietnamese Sellers and Founders Need an ITIN#

Vietnam's cross-border e-commerce numbers are startling. Cross-border e-commerce exports hit $3.4 billion in the first half of 2025 alone, powered by hundreds of thousands of Vietnamese sellers on international platforms. On Amazon, the number of Vietnamese sellers passing $1 million in sales grew 60% in the twelve months to July 2025, with products sold up 35%. At home, TikTok Shop counted 267,000 active Vietnamese sellers in the first half of 2025. Selling is a national skill. Getting paid by Americans is the bottleneck.

The US LLC, the EIN, and Form 5472#

Here is the chain almost every serious Vietnamese seller eventually walks. Stripe does not support Vietnam, and PayPal's Vietnamese service is limited. So the standard workaround is to form a US LLC, usually in Wyoming or Delaware, get an EIN for it, and open US payment processing through the company. Our guide to the best states for a non-resident LLC covers that first step, and the PayPal business account with an ITIN or EIN guide covers the payments side.

The LLC solves the payment problem and creates a compliance one. A foreign-owned single-member LLC must file a pro forma Form 1120 with Form 5472 attached every year, on the company's EIN. The personal ITIN enters the picture the moment a personal filing does: a Form 1040-NR reporting US-connected income, a refund claim, or a platform or bank that insists on a personal US tax number behind the company. If the LLC is your only US tie so far, you may not need the ITIN yet. Our guide to getting an ITIN without a tax return walks through the exceptions that do and do not apply to founders.

The June 2026 rule for multi-member LLCs#

One recent change matters specifically to Vietnamese founders who set up multi-member LLCs with partners or family. Effective June 1, 2026, an applicant claiming Exception 1(a) as a partner must include an excerpt of the partnership or LLC agreement showing the entity's name and EIN, backed by the CP 575 or 147C letter, when a CAA files the W-7 (IRS Acceptance Agent Program changes). If your LLC agreement is a template you signed and forgot, dig it out before you apply. Applications missing the excerpt bounce.

Reclaiming over-withheld tax with Form 1040-NR#

Without a treaty, correctly withheld 30% on dividends is final, and no filing brings it back. But plenty of withholding is not correct. Platforms over-withhold on income that is effectively connected to a US business, gross proceeds get taxed as if they were pure profit, and backup withholding hits accounts with incomplete paperwork. The money comes back through a filed Form 1040-NR, and that return needs a US taxpayer number. For a Vietnamese founder without an SSN, that number is the ITIN.

Banking and the practical doors#

An ITIN also does quieter work. Many US banks and fintechs accept it in place of an SSN when you open a US bank account as a non-resident, and it is the number that can start a US credit file. For a seller running real dollar volume through a US LLC, a proper US account under your own tax number beats routing everything through intermediary wallets.

Your Mã Số Thuế Is Not an ITIN#

Search for "mã số thuế" and "ITIN" together and you will find forums confidently equating the two. They have nothing to do with each other. The mã số thuế (MST) is Vietnam's domestic tax code, issued under the Ministry of Finance for Vietnamese tax obligations. The ITIN is a US federal number issued by the IRS for US tax filings. Neither system reads the other's numbers.

And the MST just changed shape, which will make the confusion worse before it gets better. From July 1, 2025, under Circular 86/2024/TT-BTC, Vietnam replaced individual tax codes with the 12-digit personal identification number from the CCCD card. Your CCCD number now is your Vietnamese tax code (KPMG Vietnam). That is a genuine simplification inside Vietnam. It changes nothing in the US. You cannot put an MST or a CCCD number on a W-8BEN, a 1040-NR, or a joint return. The only way to get a US taxpayer number without an SSN is Form W-7, the ITIN application, and the rest of this guide is about filing it right.

Getting an ITIN for a Vietnamese Spouse of a US Citizen#

The seller story dominates the headlines, but the family story quietly drives some of the largest refunds. In fiscal year 2022, 87% of Vietnamese green cards were issued through family reunification, one of the highest family shares of any origin country. Behind that statistic are thousands of couples where one spouse is a US citizen and the other is a Vietnamese citizen with no SSN, often still living in Vietnam while the immigration paperwork grinds along. Those couples can usually file a joint US return years before the visa arrives, and the ITIN is what makes it possible.

The switch is Internal Revenue Code section 6013(g). A US citizen or resident married to a nonresident alien can elect to treat that spouse as a US resident for tax purposes, and the couple then files married filing jointly like any American couple. The election is a signed statement attached to the first joint return, and the spouse's Form W-7 travels in the same envelope. Our spouse ITIN guide walks through the paperwork line by line. The numbers tell the story:

For tax year 2025, filed in 2026, the joint standard deduction is $31,500 against $15,750 filing separately, rising to $32,200 versus $16,100 for tax year 2026. That is roughly $15,750 of extra income shielded from US tax every year, plus wider joint brackets.

Then there is the Child Tax Credit rule that families get wrong constantly. Under the 2025 tax law, the credit is worth $2,200 per qualifying child, up to $1,700 of it refundable, and the child must have an SSN. The claiming taxpayer must also have a work-valid SSN, but on a joint return only one spouse needs one. A US-citizen parent with an SSN, a Vietnamese spouse with an ITIN, and US-born kids with SSNs still claim the full credit for every child. The one honest trade-off: once the election is in place, the couple reports worldwide income, including the Vietnamese spouse's earnings, rental income in Ho Chi Minh City, or business income at home. Foreign tax credits usually soften that, but run the numbers before electing, not after.

Documents Needed for Your ITIN Application#

Three things make a complete package, and the order of importance surprises people. The passport matters most, the W-7 is just the form, and the attached tax reason is what makes the application valid. Miss any one and the whole package bounces.

1. A certified copy of your Vietnamese passport, or the original. The current P-series passport, the dark blue-violet booklet issued since July 2022 with an embedded chip since March 2023, has a bilingual Vietnamese and English data page, so no translation issue arises. It proves both identity and foreign status on its own. A plain photocopy is rejected. So is a copy from a phòng công chứng, which we cover next.
2. Form W-7, the ITIN application itself, current revision, signed and dated with the correct reason box checked. For a spouse case, that is the spouse box with the US citizen's name and SSN entered. For an Exception 1(a) partner case, the exception details go on the form.
3. A reason the IRS recognizes. For most applicants this is a US federal tax return attached to the W-7: the couple's joint return with the 6013(g) statement, or a founder's 1040-NR. Exception filers attach their exception proof instead, such as the LLC agreement excerpt required from June 2026. A flawless passport copy with no valid reason still earns a rejection letter.

Two passport-specific notes. Vietnamese adult passports run a full 10 years, so expiry is less of a trap than in five-year-passport countries, but check the date anyway; the IRS rejects expired documents. And if your P-series passport was issued between July and September 2022, check the annotations page. The first blue passports omitted place of birth, several countries rejected them, and Vietnam fixed it with birthplace endorsement stamps from September 15, 2022 before restoring birthplace to the data page. An early-2022 booklet without the annotation is asking for document trouble, with the IRS and everyone else. Get it endorsed or renewed first.

The Passport Problem: How to Certify It from Vietnam#

This is where most Vietnamese applications stall. The IRS accepts a certified passport copy from exactly three sources, and a Vietnamese notary office is not one of them. A notarized copy from a phòng công chứng in District 1 or Hoàn Kiếm will be rejected no matter how many red stamps it carries. Here are the three routes that work.

Option A: The Immigration Department, the passport-issuing authority. The IRS accepts a certified copy from the agency that issued the document. In Vietnam, that is the Immigration Department (Cục Quản lý xuất nhập cảnh) under the Ministry of Public Security, the office behind your P-series passport. This route is legitimate but slow in practice: certified true copies for foreign tax agencies are not the office's daily work, so expect an in-person visit, patience, and follow-ups.

Option B: The US Embassy in Hanoi or the US Consulate General in Ho Chi Minh City. Both posts offer notarial services to all nationalities, by appointment only, at $50 per consular seal. One caveat worth stating plainly: the notarial page does not itemize a certified true copy of a passport for ITIN purposes as a listed service, so email the consular section and confirm they will certify a passport copy for the IRS before you book and pay. Contact details are below.

Option C: An IRS Certifying Acceptance Agent. A CAA is authorized by the IRS to verify your identity and passport directly, then submit the W-7 with a Certificate of Accuracy. With an online CAA, the verification happens over a video call, so the passport never leaves Vietnam and nothing gets mailed to Texas except paper the IRS actually needs. For a seller in Ho Chi Minh City or a spouse in Da Nang being added to a US citizen's joint return, this is usually the cleanest route. Read up on what a Certifying Acceptance Agent is and why the credential matters, because as the next sections show, you will not find one inside Vietnam.

A word on the mail-in alternative. Skip certification entirely and you must send your original passport to the IRS in Austin. From Vietnam, that means weeks of one-way transit, up to 60 days before originals come back by the IRS's own timeline, and a real risk of loss. People do lose passports this way. The risk is avoidable, so avoid it.

How to Apply for an ITIN from Vietnam, Step by Step#

The process is identical whether you are in Hanoi, Ho Chi Minh City, or Little Saigon. What changes is the certification route you choose in step three. Here is the full sequence.

1. Confirm the tax reason and gather documents. Identify the trigger: a joint return with a US-citizen spouse, a 1040-NR for your LLC's US income, a refund claim, or an exception. Founders with multi-member LLCs should pull the LLC agreement and EIN letter now.
2. Complete Form W-7. Use the current IRS revision, tick the correct reason box, and enter your name exactly as the passport shows it, diacritics dropped the way the passport's machine-readable line drops them. For the spouse case, add the US citizen's name and SSN where the form asks.
3. Certify the passport through one of the three valid routes. The Immigration Department, the US Embassy in Hanoi or Consulate General in HCMC, or an IRS CAA. Most applicants pick an online CAA to keep the passport and skip the queues.
4. Attach the reason. The joint return with the signed 6013(g) election statement for spouse cases, your own federal return for founders and filers, or exception proof for those who qualify.
5. Submit the package. A CAA files it for you with the certification attached. Going DIY means mailing everything to the IRS ITIN Operation in Austin, ideally by tracked courier from Vietnam. Couriers cannot deliver to a PO box, so DHL and FedEx shipments must use the street address below, not the standard mailing address.

1. Wait 9 to 11 weeks. The IRS quotes 7 weeks normally and 9 to 11 weeks from overseas or during the January 15 to April 30 peak; from Vietnam, plan on the longer band. Approval arrives as a CP565 letter. Silent after 7 weeks? Call +1-267-941-1000, or check your ITIN status without the hold music.

There is no online W-7 and no IRS office in Vietnam. Any site offering to issue an ITIN entirely online without a CAA behind it is either reselling the paper process or wasting your money.

IRS-listed Acceptance Agents in Vietnam#

Here is the hard local fact. The IRS page for Acceptance Agents in Vietnam lists exactly one entry:

Read the fine print, because it matters more than the listing. On IRS country pages, an asterisk next to a name means the firm is a plain Acceptance Agent, not a Certifying Acceptance Agent, and this entry carries the asterisk. A plain AA can help you fill out the W-7 and review your documents, but it cannot certify your passport. You would still have to send the original passport to Austin or obtain a certified copy elsewhere. So the honest summary for a country of 100 million people with a booming cross-border seller economy is: one acceptance agent, zero certifying acceptance agents.

That leaves a Vietnamese applicant with three realistic paths. The Immigration Department certified-copy route plus DIY mail, workable but slow and paperwork-fragile. The embassy or consulate notarial route, at $50 per seal with the confirm-first caveat above. Or an online CAA who verifies the passport over video and files the package, which is how most Vietnamese applicants actually finish the job. Taxsym connects applicants with a network of IRS-authorized Certifying Acceptance Agents who verify documents remotely, prepare the W-7 along with the 6013(g) election paperwork or the LLC exception documents where the case calls for them, and submit everything with a Certificate of Accuracy. The passport stays in Vietnam, and you deal with one team instead of the IRS mailroom.

Apply With Taxsym vs Doing It Yourself#

Both routes end at the same nine-digit number. The difference is risk, speed, and where your passport spends the next two months. In the applications we see from Vietnam, the certification step is where do-it-yourself filers stall: no CAA exists in the country, the embassy path needs an emailed confirmation before it is even bookable, and a phòng công chứng stamp is rejected outright.

Taxsym works with IRS-authorized Certifying Acceptance Agents who handle the W-7, verify documents remotely, and file the package. The named author on this guide, Ömer Y., holds the CAA credential. The applicant stays in Ho Chi Minh City or San Jose, keeps the passport, and once the CP565 arrives the number goes straight to work: a joint return, a 1040-NR, a refund claim, or a US bank application.

Apply online with Taxsym. Keep your passport. 100% money-back guarantee on prep errors.

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Common Mistakes Vietnamese Applicants Make#

• Sending a phòng công chứng copy. A Vietnamese notary office cannot certify your passport for the IRS, however official the seals. Only the Immigration Department as the issuing agency, the US Embassy or Consulate General, or an IRS CAA can. Do not pay for a notarized copy expecting it to work.
• Treating the CCCD or mã số thuế as a US tax number. Since July 2025 your CCCD number doubles as your Vietnamese tax code, but no Vietnamese number is valid on a US return, a W-8BEN, or a bank's US tax form. The IRS only accepts an SSN or an ITIN.
• Waiting for the treaty. The 2015 treaty has been "coming soon" for over a decade. Do not delay a filing, a refund claim, or a spouse election on the theory that ratification will change the math next year. File under the rules in force now.
• Filing jointly without the 6013(g) statement. A joint return with a nonresident spouse needs the signed election statement attached, along with the W-7. Software that quietly files you as married filing separately throws away the $31,500 deduction the whole exercise was for.
• Couriering the passport to the PO box. DHL and FedEx cannot deliver to P.O. Box 149342. Courier shipments must go to the Mail Stop 6090-AUSC street address in Austin, or they bounce back across the Pacific.
• Applying with no valid reason attached. A perfect passport copy with no tax return or qualifying exception earns a rejection letter, nothing more. Confirm the trigger, and for multi-member LLC founders after June 2026, confirm the agreement excerpt is in the package.

FAQ: ITIN From Vietnam#

Is there an IRS Acceptance Agent in Hanoi or Ho Chi Minh City?#

There is one plain Acceptance Agent, New Generation Consultancy in Ho Chi Minh City, on the IRS Vietnam list, and none in Hanoi. Vietnam has zero Certifying Acceptance Agents, so no one in the country can certify your passport for the IRS. Applicants use the Immigration Department, the embassy or consulate, or an online CAA.

Can a Vietnamese notary certify my passport for the IRS?#

No. The IRS does not accept notarized passport copies from a phòng công chứng or any Vietnamese lawyer. It accepts certification only from the passport-issuing authority, meaning the Immigration Department under the Ministry of Public Security, from the US Embassy in Hanoi or Consulate General in HCMC, or from an IRS Certifying Acceptance Agent. A notarized copy, whatever it costs, gets the application rejected.

I'm a US citizen married to a Vietnamese citizen. How do I get my spouse an ITIN?#

You file a joint return with a signed section 6013(g) election statement treating your Vietnamese spouse as a US resident for tax purposes, and attach the spouse's Form W-7 with a certified passport copy to that return. The joint filing is the qualifying reason. The reward is the full joint standard deduction, $31,500 for tax year 2025, plus preserved Child Tax Credit eligibility, since only one spouse on a joint return needs an SSN. Our spouse ITIN guide has the full walkthrough.

Is my mã số thuế or CCCD number valid for US taxes?#

No. The mã số thuế was Vietnam's personal tax code, and since July 1, 2025 it has been replaced by the 12-digit CCCD number under Circular 86/2024/TT-BTC. Both are purely Vietnamese identifiers. The IRS does not recognize either, and the only US taxpayer numbers are the SSN and the ITIN.

Will the US-Vietnam tax treaty change my withholding?#

Not until the US Senate ratifies it, and it has not since the treaty was signed in 2015. The treaty is not in force, so the flat 30% statutory withholding on US dividends and royalties applies with no W-8BEN reduction available. Technical talks resumed in May 2025, but until ratification happens, plan your taxes on the 30% reality.

How long does an ITIN take from Vietnam?#

Plan for 9 to 11 weeks of IRS processing, the band the IRS quotes for applications filed from abroad or during the January 15 to April 30 peak. Add courier time each way if you mail documents yourself. An online CAA removes the slowest and riskiest leg, since your passport never travels at all, and approval arrives as a CP565 letter.

What does it cost, and is there an IRS fee?#

The IRS charges nothing for Form W-7 itself. Your real costs are certification and preparation: $50 per consular seal at the US Embassy in Hanoi or the Consulate General in HCMC if that route confirms availability, courier fees to Austin, or a CAA's service fee. The CAA fee buys a checked package, a kept passport, prepared spouse or LLC paperwork, and a much lower rejection rate.

The Bottom Line for Vietnamese Applicants#

For a Vietnamese applicant, the ITIN was never going to cut US withholding, because the 2015 treaty still is not law and no number changes a statutory rate. What the ITIN actually does matters more for this community anyway. It lets a seller behind a US LLC file the 1040-NR that reclaims over-withheld dollars and satisfies the platforms and banks holding the money. It puts a Vietnamese spouse of a US citizen onto a joint return worth an extra $15,750 of standard deduction while keeping the full Child Tax Credit alive. And it does what no mã số thuế or CCCD number can do: it gives you a number the IRS actually recognizes. Match the application to a real trigger, certify the passport through one of the three valid routes, and never send the original across the Pacific. Start with the complete ITIN guide if you want the full picture, then come back and file it right.