You need one when there is Vietnamese tax to declare. Under Law 149/2025/QH15 and Law 109/2025/QH15, rent below VND 500 million a year carries no tax. Above that line, and when you sell, a tax code comes into play.
A tax code sounds like the first piece of paperwork a new landlord should chase. For most foreign owners of a single Hanoi apartment it is not, and knowing why saves a pointless errand.
What the tax code is actually for
It is the identity that Vietnamese tax declarations hang on. An owner whose rent crosses the VND 500 million threshold declares personal income tax at 5% on the excess under Law 109/2025/QH15, plus value added tax above the same threshold under Law 149/2025/QH15, and both filings need a tax code to exist.
The administration around those filings was rewritten at the same time as the taxes: Law 108/2025/QH15, passed in December 2025, resets how households and individuals declare and invoice. The practical consequence for a landlord is that the declaring, when it applies, runs on records, not on estimates recalled at year end.
Below the threshold, the errand disappears
Most single apartments in our portfolio sit under the line. Two-bedroom units in the five western-corridor buildings we manage ask $700–1,300 a month as of July 2026, listed building by building on our portfolio pages, well below the roughly USD 1,600 a month that VND 500 million a year works out to at early-2026 exchange rates.
At those rents there is no rental income tax, and no rental tax declaration to make. What remains worth keeping is the paper itself: a monthly record of rent received and expenses, because the threshold is measured over a year and your position should be visible, not assumed. It is also written for the individual, not the apartment: Law 149/2025/QH15 sets the VND 500 million line for households and individuals, so an owner letting two units counts both rents toward the same threshold. If that is your case, model it with an advisor rather than per apartment. Whether any registration still applies to your wider circumstances is an advisor question, not a guess to make from a blog post, ours included.
The tax code returns at the exit
Selling is where the record you kept becomes money. Sale proceeds leave Vietnam through the banking system, and the bank reconstructs the history before it remits: how the purchase money came in, what income the apartment declared where declaration applied, and the receipts for tax paid along the way.
An owner who rented above the threshold for years without declaring meets that history at the worst possible moment. The ownership-side version of this rule — why every payment should run through the banking system from day one — is in our guide to foreign ownership.
Who does this when you live in Hong Kong
Registering, declaring and keeping receipts does not require you in Vietnam. Our legal and financial support coordinates a licensed advisor who handles the Vietnamese side, and the monthly statement from property management — rent received, itemized expenses — is the source document the filings are built from.
How the tax itself is calculated, including the threshold table and the 10% rule the internet still repeats from the Circular 40/2021 era, is in the pillar guide: rental income tax for foreign landlords in Vietnam.
Confirm your own case with a licensed Vietnamese tax advisor. Thresholds and administrative rules moved twice in 2026 already, and this page describes the pattern, not your file.
Common questions
Do I need a tax code if my rent is below VND 500 million a year?
There is no rental income tax to pay below that threshold under Law 149/2025/QH15 and Law 109/2025/QH15. Whether any registration still applies to your wider situation — other Vietnamese income, a planned sale — is a question for a licensed Vietnamese tax advisor.
Why does the tax code matter when I sell the apartment?
Because the money leaves Vietnam through a bank, and the bank asks for the tax history behind it. Sale proceeds remit against a documented record: purchase payments, declared rental income where it applied, and receipts for tax paid.
Can someone register and file for me while I live abroad?
Yes. Filing does not require you to be in Vietnam. Cozyhome's legal and financial support coordinates the advisor who registers, declares and keeps the receipts, working from the monthly rent statements.
