The short answer
Two very different rules, one quick test
Most people asking this question already know which answer they want, and the rules do not care. If you are in Vietnam on a 90-day e-visa, you cannot extend it. There is no office in Saigon that will add 30 days to an e-visa, no agent who can do it quietly, and no "extension" service that changes that. You leave the country and come back on a new one. For a Ho Chi Minh City resident that means Moc Bai, 80 kilometers up QL22, or a flight to Phnom Penh.
If you hold a tourist or business visa stamped by a Vietnamese embassy, or a DN, DT, or TT visa with a sponsor behind it, the picture flips. Those can be extended inside Vietnam at the Immigration Department, usually once, usually for 30 days, and at a cash cost well below a border run. You need a sponsor to file for you, a registered temporary address, and five to ten working days in which your passport sits at the office instead of in your bag.
The rule people get wrong
An e-visa cannot be extended in Vietnam
The e-visa is issued as a fixed-validity entry permit. It gives you 90 days from your entry date, single or multiple entry, and it expires when it expires. Vietnam Immigration has no in-country procedure for it, which is stated on the official evisa.gov.vn portal and repeated in embassy notices on the subject. Search results promising an e-visa extension "without leaving Vietnam" are selling a new application, a border run, or a different visa type, sometimes without saying which.
Visa-free entry works the same way. If you came in on the 45-day exemption or a bilateral 14 to 30-day entry, there is nothing at the immigration office to extend.
That leaves two legal moves when your e-visa is running out. The first is exit and re-enter on a new e-visa: cross at Moc Bai, take the Vietnam exit stamp, re-enter once the new approval is in hand, and the 90-day clock starts again. The second is switching visa category while you are still legal, which needs a business sponsorship, a work permit, an investment certificate, or a Vietnamese spouse. That route takes weeks and cannot be started in your last ten days.
One claim is worth flagging because it circulates in 2026 blogs: that e-visas can now be extended once, by up to 90 days, through the portal. The portal does not offer that, and the US Embassy in Vietnam still publishes that e-visas cannot be extended inside the country. The step-by-step run guide is built around the rule that officers actually enforce at the window.
The extension path
What can actually be extended in country
Four visa types can be extended at a Vietnam Immigration Department office, and the ones that matter in Saigon are the DL tourist stamp and the DN business stamp.
DL is the tourist visa issued by an embassy or consulate rather than through the e-visa portal. It is extendable once, typically for 30 days, single entry only. If you still have one in your passport from a consulate in Bangkok, Phnom Penh, or Vientiane, this is the cheap route.
DN is business. The extension length follows the sponsoring company's paperwork, from one month up to a year, and repeat extensions over time are normal here, unlike the tourist stamp.
Fees and turnaround
A small official fee, a 1.2 to 1.5 million dong agency bill
Published government fees for a 30-day extension run from about 10 USD to 25 USD depending on the visa type and the office handling it, and the photos are on you. Agencies in Ho Chi Minh City charge 1,200,000 to 1,500,000 VND all in, which covers the form, the photos, the queue, and someone who knows which counter to stand at. Urgent handling in three to five days usually adds around 500,000 VND. Normal processing runs five to ten working days, Monday to Friday only, and holidays add days on top.
The hidden cost is the passport. It stays with immigration for the whole processing window, so nothing that needs it can happen: no flight out, no hotel check-in abroad, no other application running in parallel.
Read down that last column and the ranking inverts. A DIY run that resets you for 90 days costs about 37,800 VND a day, less than the agent extension at 45,000. The van bundle runs about 58,900 VND a day, which is roughly what you pay for the day being someone else's problem.
One caveat on that DIY line. The 3,400,000 VND already includes an e-visa you filed yourself, and it assumes you own a bike and know QL22. If you are riding, your own risk tolerance is part of the price. The budget ranking page takes that arithmetic apart option by option.
Where the extension genuinely wins: you already hold a DL or DN visa with a sponsor behind it, you have ten days of slack, and you do not need 90 more days. For 1,350,000 VND and a passport handover you stay in your own apartment, skip the 4 AM start, and you are done.
Time
Ten working days or one long day
The extension takes two office visits if you go direct, one if an agent handles drop-off and collection, spread over five to ten working days. Start it with a week of buffer and it never bites. Start it on day 85 and it does, because the office does not work weekends and holidays add days.
A visa run takes one day. Pickup before sunrise from District 1, Thao Dien, Thu Duc, or Phu My Hung, about two hours each way on QL22, and back in the city by early evening. Both crossings at Moc Bai take 15 to 20 minutes each on a normal weekday if you are there before the tour buses. The step-by-step walkthrough goes through every window in order.
If it is a weekday off work against ten days of waiting, the run wins on calendar time even when it loses on cash.
One timing rule that trips people up: file the new e-visa before you leave Vietnam, not from a cafe on the Cambodia side while you wait. Standard processing is three to four working days and weekends do not count toward it. The e-visa desk guide shows how the desk files the moment your exit stamp is in hand, which is the version that keeps a same-day loop possible.
Do not decide late
The one mistake that costs more than either option
Deciding late is where this gets expensive. Overstaying while you work out which route to take costs more than both routes combined.
Under Decree 282/2025 an overstay of under 16 days is fined 500,000 to 2,000,000 VND. That is the light bracket and it is still pure waste, because it buys you nothing. From day 16 the minimum jumps to 5,000,000 VND, deportation becomes a possible sanction rather than a remote threat, and the airport counter stops being a place where it gets settled quietly. The bands climb from there, to 30,000,000 to 40,000,000 VND for an overstay of a year or more. The 2026 overstay fines guide lists every bracket and what happens at the airport versus at an immigration office.
If the answer is the run, here is the price
Transport to Moc Bai and back is 2,000,000 VND per traveler, about 79 USD. The 90-day e-visa add-on is 2,400,000 VND single entry or 3,100,000 VND multiple entry. The Cambodia visa add-on is 1,100,000 VND on top of the cash fee at the Bavet counter, and onsite guided assistance through both borders is 700,000 VND. Transport plus both visas is 5,300,000 VND; the full bundle is 6,000,000 VND.
Pickup runs from District 1, Thao Dien, Thu Duc, and Phu My Hung before sunrise, and you are back the same evening. Pay on arrival, cancel free up to 24 hours ahead. Message WhatsApp +84 369 308 237 and the team confirms your package and total within one business hour.