If you're an Aussie making 3-12 Cambodia trips a year, the right visa changes shape with the cadence. Three patterns, one break-even number, and the spreadsheet you wish you'd seen before your third trip.

Three patterns depending on your trip cadence. (1) 2-3 trips a year, each under 30 days → buy a fresh Tourist eVisa each time ($80 USD / ~$122 AUD per trip; ~$240 USD / ~$366 AUD/year for 3 trips). (2) 4+ trips a year + one over 30 days → enter on Business eVisa, get a 6-month multi-entry extension, fly in and out freely during that window (~$300-330 USD / ~$457-503 AUD total for 6 months). (3) Year-round with monthly trips out → Business eVisa + 12-month multi-entry extension (~$420-540 USD / ~$640-822 AUD). The break-even point between repeated Tourist eVisas and a Business+extension is around 4 trips per year.
Most Aussies booking a single Cambodia trip don't think about visa strategy — they just buy the Tourist eVisa, fly in, fly out, and forget about it. The question gets interesting the moment a second Cambodia trip lands in the calendar, and it gets urgent by the third. By the time a frequent-traveller pattern is obvious — a Sydney consultant making four Phnom Penh trips a year, a Melbourne sales rep flying in monthly, a Brisbane retiree splitting life between Kampot and the Gold Coast — most Aussies have already paid for the wrong product at least once.
This guide is the spreadsheet we wish those travellers had seen earlier. It maps the three honest frequent-traveller patterns we see on the desk, the break-even number that decides between them, and the operational reality of each — what the Immigration counter actually feels like for someone on their seventh Cambodia entry of the year, versus someone refiling a fresh eVisa form every six weeks.
Almost every Aussie doing more than two Cambodia trips a year falls into one of three patterns. The cleanest way to find your fit is to look honestly at trip cadence, longest single-stay duration, and whether your year is front-loaded or evenly spaced. The right visa product follows from there.

The break-even number that most frequent-traveller decisions pivot on is four trips a year. Below that, repeated Tourist eVisas almost always win on cost. Above it, the Business + multi-entry extension wins on convenience even when the headline price is line-ball. The worked example below is the cleanest one to keep in your head.
Sydney-based management consultant, four Cambodia trips a year, each roughly two to three weeks except the last one in November which lands at 35 days because the engagement extended. Option A: four Tourist eVisas at $80 USD each = $320 USD (~$487 AUD). Problem: the 35-day trip in November is illegal on a Tourist eVisa since the November 2025 in-country extension rule change, so this option is structurally broken for her. Option B: enter on the Business eVisa for the November trip ($90 USD), lodge a 6-month multi-entry extension covering the back half of the year ($210-290 USD with multi-entry premium), and use it to cover all four trips that fall in that window. Total: $300-380 USD (~$457-579 AUD). Close to Option A on cost, but actually legal and operationally simpler.
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Run the same maths for a traveller doing exactly four trips a year all under 30 days, and Option A is cheaper at $320 USD (~$487 AUD) versus Option B at $300-380 USD (~$457-579 AUD) — meaningfully cheaper at the bottom end of Option B's range, line-ball at the top. At five trips, Option A jumps to $400 USD (~$609 AUD), and Option B's $300-380 USD pulls clear. At six trips, Option A is $480 USD (~$731 AUD) and there's no argument left. The rule of thumb that holds in practice: four trips a year is the break-even, but it's the trip-shape (any stay over 30 days?) that usually forces the decision earlier than the cost number does.

Cost is one axis; what it actually feels like to live each strategy is the other. The repeated Tourist eVisa route is the cheaper path for low-cadence travellers, but it has one operational rule most Aussies miss the first time: you cannot apply for a new Cambodia eVisa while you are still inside Cambodia. The portal expects you to be applying from outside the country at the time of submission, and the system is checked at entry. For repeated Tourist eVisa travellers, that means every fresh application has to happen during your between-trip time in Australia or in another country — usually Australia, given the trip-shape. Three or four times a year, you log into the portal from your couch in Sydney, pay $80 USD, wait three business days, and have the PDF in your inbox before you fly.
The Business + multi-entry extension route is the opposite shape. You do one upfront eVisa application before your first trip of the cycle ($90 USD, three business days), one in-country extension visit to an immigration agent in Phnom Penh or Siem Reap (7-14 business days, agent fee + multi-entry premium in cash), and then for the next six or twelve months you do nothing — you walk up to Immigration on each re-entry, hand over your passport with the multi-entry stamp inside, and pass through without filing anything. That's the convenience premium the strategy buys. The downside is the upfront effort and the in-country admin visit — most Aussies on a 4+ trips/year cadence will rate the upfront annoyance as cheap insurance against twelve months of friction.

Three mistakes show up enough times across the Aussie frequent-traveller desk to be worth flagging plainly. They are not edge cases — they are the standard pattern of how a sensible-on-paper plan goes sideways mid-year.
Mistake one: over-buying the Business + extension stack when your cadence doesn't justify it. Two leisure trips a year, both under 30 days, does not need a Business eVisa or a multi-entry extension. The $90 USD Business eVisa is wasted (you could have used the $80 USD Tourist), the extension fee is wasted (your trips are under 30 days), and the multi-entry premium is doubly wasted (you don't need re-entry permission you'll never use). Buy the Tourist eVisa per trip and move on. The Do Australians Need a Visa for Cambodia pillar walks through which class fits which trip shape.
Mistake three: switching strategy mid-year and wasting the unused half. If you start the year on the Business + 12-month multi-entry extension and then your work shifts in June and the next six months are quiet, you can't get a refund on the unused half of the extension — the money is already with Immigration. Conversely, starting on repeated Tourist eVisas and then trying to switch to Business + extension halfway through the year doubles up the upfront costs. The honest advice is to plan the year as a single picture rather than month-to-month, even if that means accepting some uncertainty in the November and December trip count. If you genuinely cannot predict the back half of the year — common for sales reps and consultants whose pipelines firm up quarterly — the 3-month extension is the lowest-regret default. It's the cheapest extension length per dollar of optionality, it covers the next quarter cleanly, and you can stack a second 3-month or upgrade to 6-month at the renewal point if the cadence holds.

Bangkok in, Siem Reap out — but the land border's closed.
Read the 2026 update →Classic Indochina pairing. Phu Quoc beaches are visa-free for 30 days.
See the combo guide →Overlooked third stop on the Indochina loop.
Plan the Laos route →Where most Aussies stop on the way through.
Sort the stopover →Bali or Cambodia for your next trip — or both?
Compare the two →