Policy check, updated September 2026
The crossing is legal and routine. What has changed is how closely your stamp history gets read, and which mistakes now cost real money. Here is the 2026 picture for a Moc Bai run out of Saigon.
The short answer
A visa run is an exit followed by a re-entry on a visa you are entitled to hold. Vietnam has never banned that, and it did not ban it in 2026. The Moc Bai passenger gate runs around the clock, the Cambodia visa at Bavet still gets issued at the window, and a fresh 90-day e-visa works exactly the way it did last year.
What shifted is attention, not permission. Vietnam took 22.8 million foreign arrivals in 2025, a record, and 9 million more in the first months of 2026, up 22.5 percent on the year before. At a conference in Ho Chi Minh City on 15 May 2026, the Ministry of Public Security said it would strengthen management of foreigners and told police units to sharpen enforcement, while leaving the visa policy itself open. The door stays wide and the paperwork inside it gets read more carefully.
For a normal runner the practical difference is small. The people who feel the tighter reading are working without a permit on a tourist entry, overstaying by a few days, or stacking short exemption stamps for years. Clean stamps, an honest purpose tag and a valid visa make a crossing look like any other tourist crossing, because that is what it is.
What moved in the last 18 months
The e-visa became the normal way to do this. Ninety days, single or multiple entry, open to every nationality, 25 USD for a single entry and 50 for multiple, filed at evisa.gov.vn and decided in 3 to 5 working days. It is also the only long stay you can hold without a sponsor, and it cannot be extended inside Vietnam. That last clause is the reason the run exists at all.
Overstays got expensive. Decree 282/2025 rewrote the fine schedule for people who stay past their stamp. Under 16 days, the fine stays between 500,000 and 2,000,000 VND. From day 16 the floor jumps to 5,000,000 VND, deportation becomes a possible sanction, and the airport counter is no longer the place to settle it. A two-day lapse now costs more than the whole visa run.
The agencies started talking to each other. Decree 286/2026/ND-CP took effect on 15 September 2026 and replaced Decree 64/2015. It requires immigration, labour, investment and local authorities to share data on foreigners who entered on e-visas or exemption, including work permit records and temporary residence declarations. Nothing in it changes e-visa fees, the 90-day stay or the exemption list. What it changes is how quickly a contradiction shows up, for instance a work permit on file in one ministry and a tourist stamp on your last entry.
A digital arrival card arrived, at airports. Since 15 April 2026, travellers flying into Tan Son Nhat (and since then a few other airports) file a free pre-arrival declaration at prearrival.immigration.gov.vn inside a 72-hour window and carry the QR code. It is not a visa, it costs nothing, and as of September 2026 it does not apply at Moc Bai. Land runners can skip that tab.
Working on a tourist entry is the live issue. The ministry's own summary of what police are seeing names two things again and again: overstaying and working without proper documentation. Neither is a visa run. A run that resets a 90-day tourist stay on a laptop is one thing. The same stay with a salaried job behind it and no work permit is what puts a file on someone's desk.
What the officer sees
Every entry and exit in Vietnam is recorded against your passport number. Nobody is standing on QL22 counting your trips, but the record travels with you: it is in the system when you hand the passport over at Moc Bai, and it is there again the next time you fly into Tan Son Nhat.
A clean run leaves a boring signature. Exit stamp, new visa, entry stamp on a date the visa covers. That is what a weekend in Cambodia looks like too, so there is nothing to explain. The signatures that draw questions are the other ones: an overstay stamp, a visa that expired mid-stay, a single-entry visa presented for a second entry, a name that does not match the passport line.
One more thing worth saying plainly, because it comes up in forums constantly. There is no published cap on how many times you can cross. What exists is officer discretion, and discretion gets exercised when a pattern looks like residency rather than travel.
Where a run actually goes wrong
Almost every failed re-entry at Moc Bai traces back to the paperwork you carried in, not to the act of crossing. These are the four that come up:
The full walkthrough of what happens at each window is on the step-by-step guide.
The pattern question
There is no rule that says four border runs is one too many. There is a pattern that officers recognise. Somewhere around the third or fourth Cambodia loop inside six months, the questions at the window can change shape: what brings you to Vietnam, how you support yourself, when you are flying home. Experienced runners describe the same list, and the reliable way to answer is to actually have the answers.
Two habits keep a record clean. The first is to run on a 90-day e-visa instead of stacking short entry stamps, because ninety days at a time means two or three crossings a year instead of a dozen. The second is to stop leaning on short exemption entries: after two of those in a row, switch to the e-visa. It costs 25 USD and removes the whole genre of question.
If your history already has a rough patch in it, say so before you book. Our fixers read stamp histories at Moc Bai every day and will tell you honestly when a pattern looks risky, which is a better conversation to have in Saigon than at a counter 80 km away.
When the run stops being the right tool
The run is a fine answer for one more 90 days. It is a poor answer for a fifth year. Once you know you are staying, the options that beat it are not secret and they are not expensive:
Before you book
Have these in hand
Don't do these
FAQ
Yes. Leaving Vietnam and coming back on a visa you are entitled to hold is ordinary immigration procedure, and no 2026 rule bans it. What the authorities have tightened around is overstaying and working without a permit, which are separate offences from the crossing itself.
No published limit. In practice, somewhere around the third or fourth Cambodia run in six months, officers may start asking about your purpose, how you support yourself and when you plan to leave. Running on a 90-day e-visa instead of short entry stamps keeps that count low.
Four things. Decree 282/2025 rewrote overstay fines, with the floor jumping to 5,000,000 VND at day 16. Decree 286/2026 took effect on 15 September 2026 and put immigration, work permit and residence data into shared systems. The Ministry of Public Security told police units in May 2026 to sharpen enforcement of foreigner rules, while leaving visa policy open. And a digital pre-arrival declaration started at Tan Son Nhat in April 2026, which does not apply at Moc Bai.
It happens, and it is almost always a document problem. A visa that has not reached its entry date, an entry port that does not match, a single-entry visa already used, or an unresolved overstay. Check those four lines the night before you leave and the refusal category mostly disappears.
Two more, and then the links
No. There is no minimum time outside Vietnam, and the same-day Moc Bai loop is the normal version: exit before lunch, cross back once the new e-visa is in hand. The overnight in Bavet or Phnom Penh is a convenience for people whose approval lands late, or who want the trip to feel like travel.
When the trips stop being travel. Three or four crossings a year because you are genuinely coming and going is fine. Crossing monthly because you live here and work here is a signal, and a temporary residence card or a work permit answers it properly.
Related reading: overstay fines under Decree 282/2025, the day itself step by step, what the run costs in 2026, what US, UK and Australian passports need at the border, and 105 answered questions.
Connected routes
Vietnamese immigration law is national, so the answer on this page holds wherever you cross. What changes is the route, the queue and the cost:
Send a photo of your visa and your last two stamps to WhatsApp +84 369 308 237 before you book. We will tell you whether a Moc Bai crossing is straightforward on your file, or whether a residence card is the better call. No charge for the read.