Cambodia Business Visa for Aussie 4-12 Week Engagements: 2026 Guide

Single-entry vs multi-entry Business eVisa for project teams

The single-entry vs multi-entry choice is the second most important decision after picking the Business class itself. The single-entry Business eVisa at $90 USD (~$137 AUD) all-in covers one trip into Cambodia for up to 30 days, with the in-country extension flow available for longer stretches. The multi-entry variant at $150 USD (~$229 AUD) government fee plus service margin covers multiple trips inside the 3-month validity window, with a fresh 30-day stay each time you re-enter. The cost premium is roughly $60-70 USD (~$92-107 AUD) — meaningful but rarely the decisive factor for a team on a contracted engagement.

The right pick depends on the engagement shape. A mining services scoping engagement that has the team on the ground for 8 weeks straight, then heading home, is a clean single-entry case — apply once, extend once in-country, fly home at the end. A fly-in-fly-out tech implementation engagement where the team rotates monthly to Sydney for client review, then back to Phnom Penh, is a clear multi-entry case — three or four entries inside the 3-month validity window pays for the premium straightforwardly. A 12-week AusAID programme with one mid-engagement rotation home falls in the middle; both options work, and the team typically picks based on whether the in-country extension or the multi-entry flight cadence is the cleaner administrative path.

• Single-entry Business eVisa is the right pick for: one continuous 4-12 week stretch in country, mining or industrial scoping engagements, NGO programme officers on a single long deployment, a consulting gig with no scheduled fly-home days, and any case where the in-country extension is the cleaner administrative path.
• Multi-entry Business eVisa is the right pick for: teams flying in and out monthly across 3-6 months, fly-in-fly-out tech implementation rotations, regional managers covering Cambodia plus Vietnam or Thailand on a swing, AusAID consultants on rotational deployments, and any case where the 3-month validity window covers multiple distinct trips.
• Common cost framing: the multi-entry premium of roughly $60-70 USD (~$92-107 AUD) is cheaper than a single in-country extension at a Phnom Penh agent (typically $80-120 USD (~$122-183 AUD) agent fee plus government fee). For teams on rotational engagements, multi-entry is usually the cheaper net path.

If the team has not decided between single and multi at application time, we generally suggest single-entry first — it is the simpler product, the cheaper upfront cost, and the in-country extension always exists as a fallback. Switching from single to multi-entry mid-engagement is not supported; you would need to exit and lodge a fresh multi-entry from outside Cambodia. The Cambodia eVisa multiple entry guide runs the full multi-entry mechanics, and the frequent traveller visa strategy guide for Australians runs the maths on when the premium pays off.

The 30-day stay limit and the in-country extension path

The 30-day stay limit is the single biggest gotcha for first-time consultants. The Business eVisa lets you enter Cambodia and stay for up to 30 days per entry. If your engagement runs longer than 30 days continuous (which most 4-12 week engagements do), you need to plan the in-country extension before you arrive, not after. The extension is processed through a Cambodian immigration agent in Phnom Penh, takes 7-14 business days end-to-end, and rolls your stay forward by 1, 3, 6, or 12 months depending on which extension product you pick.

The mechanics in practice. Day 1 you arrive on the Business eVisa, day 1-15 you settle into the engagement and brief the immigration agent on your timing. Day 14-16 you hand the agent your passport along with an extension application form and the agent's processing fee plus the government extension fee. The agent lodges the application at the General Department of Immigration in Phnom Penh, you get your passport back inside 7-14 business days with the extension stamped in, and your stay rolls forward by the extension period selected. The 30-day count restarts from the day the extension is approved.

The DIY path at MFAIC (the Ministry of Foreign Affairs and International Cooperation) does technically exist, but in practice almost no Aussie consultant uses it. The reasons are practical: the MFAIC counter operates in Khmer-language-first, processing involves multiple trips to the office, and the standard agent processing fee of $20-40 USD (~$31-61 AUD) on top of the government extension fee is small money in any consulting budget. Pay the agent, get on with the engagement, leave the paperwork to the people who do it every day. The Cambodia visa extension agents in Phnom Penh guide for Australians names the agent firms most commonly used by Aussie consultants.

The agent vs DIY math gets clearer as engagement length grows. A 4-week engagement with a 1-month extension is light paperwork either way. A 12-week engagement with a 3-month extension involves a regulatory filing, a passport handover, and follow-up at a government office — agent territory by default. The Cambodia visa extension vs fresh eVisa decision guide is the right reference if you are weighing whether to extend in-country or exit and re-enter.

The 1-year Business extension — the long-stay milestone

The 12-month Business extension is the milestone that converts a series of short engagements into a stable long-stay working state. The eligibility door is simple: you need an existing Business eVisa stamp in your passport. Once that is in place, your Phnom Penh-based immigration agent can lodge a 12-month extension application for roughly $330 USD (~$504 AUD) in government fees plus the agent processing fee, and the result is a 12-month authorised stay in Cambodia. The cost works out to under $30 USD (~$45 AUD) per month for the right to stay continuously — by far the cheapest long-stay working-state visa in SE Asia.

Who actually uses the 12-month extension. AusAID and DFAT-contracted consultants on long programmes are the largest single profile — a typical Asia-Pacific governance, education, or health-sector programme runs 12-36 months, and the project delivery lead lives in Phnom Penh for the duration with monthly fly-home rotations. Mining services scoping and exploration leads are the second profile — a feasibility study often runs 9-18 months on the ground. Tech delivery leads on core banking, telco, or government IT rollouts are the third — 6-12 month engagements with continuous in-country presence. NGO programme officers, training providers, and academic-research fellows round out the typical caseload.

The 12-month extension can be renewed indefinitely. There is no formal cap on the number of consecutive 12-month extensions, and we have plenty of Aussie consultants who have been on rolling 12-month extensions for three, four, or five years continuous. The renewal flow is the same as the initial extension: pass the passport to your Phnom Penh-based agent two weeks before the current extension expires, pay the government fee plus the agent processing fee, get the passport back inside 7-14 business days with the new 12-month stamp in. The cleanest long-stay path in SE Asia for an Aussie professional, full stop.

Working with a Phnom Penh extension agent vs DIY

The Phnom Penh extension-agent ecosystem is small but mature. A handful of firms handle the vast majority of foreign-consultant extension matters, each with established relationships at the General Department of Immigration and a working knowledge of every edge case the rest of us have never seen. The standard service includes the application form preparation, the passport submission to the immigration office, follow-up on any queries from the immigration officers, the passport return to the consultant, and an electronic copy of the extension stamp for your records. The processing fee runs $20-40 USD (~$31-61 AUD) for a standard extension, $50-80 USD (~$76-122 AUD) for a 12-month extension.

Picking an agent. The standard route is an introduction through your engagement's prime contractor or the project's local logistics lead — most DFAT contractors and managing consultancies have a preferred extension agent already. AustCham Cambodia's member directory is the second route. The third is a direct introduction through your hotel or co-working space — many of the Phnom Penh hotels and co-working operators have an established agent they refer guests to as a routine service. Whichever route, ask for a fixed-fee quote upfront and confirm the timeline in writing. The reputable agents have nothing to hide.

What to hand the agent. Your passport (the original, not a scan) with at least three blank pages remaining. A printed copy of your current Business eVisa or the previous extension stamp. The application form pre-filled where the agent has not done it for you (most agents handle the form themselves). The government fee and the agent processing fee in USD cash or USD bank transfer to the agent's account. A working phone number for the agent to reach you during the 7-14 business day processing window in case the immigration office raises a query. The Cambodia visa extension agents in Phnom Penh guide for Australians names the firms we work with most often.

Next steps and related reading for Australians: apply for your Cambodia eVisa when you are ready to lodge, bookmark our Cambodia visa hub for Australian citizens as the single canonical reference, skim the FAQ on Cambodia visa business visa for quick answers, and use our glossary of Cambodia visa terms to decode any acronym in this guide.