4 sectors where Indonesian becomes the working language
Indonesia is a member of the G20 and the largest economy in South-East Asia. In international firms in Jakarta, English is usually enough. Outside the capital, in factories, local government offices and on the outer islands, many people speak little English, and Indonesian becomes the working language.
| Sector | Typical contacts in Indonesian | Level to plan |
|---|---|---|
| Resources, energy, manufacturing | site staff, suppliers, local authorities | B1 to B2 |
| Tourism and dive schools on Bali and Sulawesi | guests, staff, local partners | A2 to B1 |
| Research in biodiversity, volcanology, marine biology | institutes, field teams | B2 to C1 |
| Aid organisations | communities, local government | B1 to B2 |
The levels follow the Common European Framework of Reference for Languages (CEFR), which describes ability on six levels from A1 to C2. They are guide values, and your employer sets the binding requirement.
Indonesian also opens most of the Malay spoken in Malaysia, Brunei and Singapore. For regional roles, one language therefore covers several markets, as long as you learn the false friends. Kereta, for example, means train in Indonesia and car in Malaysia.
350 to 500 study hours to reach B1 in Indonesian
The Foreign Service Institute (FSI), the language school of the US State Department, plans about 36 weeks of full-time training with 828 classroom hours to bring diplomats to confident professional use of Indonesian. Vietnamese and Thai take about 44 weeks under the same scheme, Chinese and Japanese 88.
The hours per CEFR level are rough estimates for lessons plus self-study, derived from the FSI figures, because no official hour counts exist for Indonesian. At five hours a week next to a job, B1 takes about 70 to 100 weeks. An intensive start, for example two weeks of daily lessons before a posting, gets you through the first stage faster, but it needs regular practice afterwards.
Indonesian is quicker than many Asian languages because it has no tones, no conjugation and no grammatical gender. Working learners spend most of their hours on prefixes and suffixes and on vocabulary with few links to English.
Formal Indonesian for emails, meetings and address
Business Indonesian is formal Indonesian. The standard form, called bahasa baku, is used in business letters, contracts, government offices and the news. Colloquial Jakarta speech appears in chat groups and among colleagues, and it sounds out of place in an email to a client.
| Meaning | Formal Indonesian | Colloquial form |
|---|---|---|
| not | tidak | nggak, gak |
| already | sudah | udah |
| I | saya | gue, gua |
| you (to a client) | Bapak, Ibu, Anda | lo, lu |
Formal letters and emails often open with Dengan hormat, a fixed greeting meaning with respect. You address men as Bapak or Pak and women as Ibu or Bu, followed by the name. Reports and official letters also use the di- passive far more often than English does. Laporan sudah dikirim means the report has been sent.
Learn formal Indonesian first. It lets you write to clients, read contracts and follow official letters, and the colloquial speech of colleagues is easy to add later.
Business Indonesian and specialised vocabulary
A business communication course trains emails, calls, meetings and presentations. A specialised course trains the vocabulary of one field, such as mining, tourism, healthcare or research. For Indonesian, both rely on the same skill: building words from a root with prefixes and suffixes.
The root kirim (send) shows how one root covers a whole process. Mengirim means to send, kiriman a consignment, pengiriman shipping or delivery, and dikirim is sent. A course that teaches specialised terms as word families spares you long vocabulary lists.
Many technical terms look familiar to English speakers, such as komputer, internet, produksi and investasi. They follow Indonesian spelling, so learn them with their written form from the start.
Specialised Indonesian courses for a single industry are hard to find.
Private lessons that work with your own documents, such as offers, site reports or safety instructions, often have to fill the gap.
Proof of Indonesian an employer can interpret
Which proof fits depends on who reads it.
- UKBI: The Uji Kemahiran Berbahasa Indonesia is Indonesia's official proficiency test, run by Badan Bahasa, the language agency of the education ministry. You take it online on your own computer. The result is a score of up to 800 points with one of seven ratings, the highest being Istimewa.
- ACTFL OPI: The Oral Proficiency Interview of ACTFL, the American Council on the Teaching of Foreign Languages, is a 15- to 30-minute speaking test by phone. It is available in Indonesian and rates you from Novice to Superior. Employers in the US use it for staff selection.
- CEFR self-assessment: The grid of the Council of Europe and Europass lets you place yourself on the levels A1 to C2 for listening, reading, speaking and writing on your CV.
The UKBI measures native speakers as well, so it says little about beginners. It becomes useful from a solid intermediate level. No official conversion of UKBI results to CEFR levels exists, so combine a UKBI result with a CEFR self-assessment for employers outside Indonesia.
6 modules of a work-focused Indonesian course
A work-focused course starts with a needs analysis, a conversation or questionnaire about your tasks, contacts and difficulties in Indonesian. These modules usually matter:
- Introductions and forms of address with Bapak, Ibu, Pak and Bu.
- Numbers and prices in rupiah, where amounts quickly reach millions (juta) and billions (miliar).
- Formal emails with Dengan hormat and the di- passive.
- Phone calls and video meetings at normal speed.
- The vocabulary of your field, learned as word families.
- Switching between formal Indonesian and the colloquial speech of colleagues.
Indonesia has three time zones. Jakarta and Java use UTC+7, Bali UTC+8 and Papua UTC+9. Choose a teacher whose working day overlaps with the hours you keep free, for example early mornings in Europe, which fall in the Indonesian afternoon.
Frequently asked questions about online Indonesian courses for work
What Indonesian level do you need to work on site in Indonesia?
To work on site in Indonesia with local colleagues, plan Indonesian at level B1 of the Common European Framework of Reference (CEFR) as a guide value. Negotiations, research and university study call for B2 to C1. Your employer sets the binding requirement.
Is English enough for work in Indonesia without Indonesian?
English is usually enough for work in international firms in Jakarta. In factories, local government offices and on the outer islands, many people speak little English, so Indonesian becomes the working language there. Indonesian at level B1 lets you handle daily work with local colleagues.
Which certificate proves Indonesian skills to an employer?
Indonesian skills are proven with the UKBI, Indonesia's official online language test, or with the ACTFL OPI speaking interview, which US employers use for staff selection. The UKBI gives up to 800 points and one of seven ratings. For CVs in Europe, a CEFR self-assessment complements either result.
How long does it take to learn Indonesian for work up to level B1?
Learning Indonesian for work up to level B1 takes roughly 350 to 500 study hours, an estimate derived from the US Foreign Service Institute. At five hours a week, that is about 70 to 100 weeks. For confident professional use, the FSI plans about 36 weeks of full-time training.
Does Indonesian learned for work also help in Malaysia, Brunei and Singapore?
Indonesian learned for work also helps in Malaysia, Brunei and Singapore, because speakers of Indonesian understand most Malay. Vocabulary differs, and false friends such as kereta, which means train in Indonesia and car in Malaysia, need attention.
How do you open a formal business email in Indonesian?
A formal business email in Indonesian often opens with Dengan hormat, a fixed greeting meaning with respect. You address the recipient as Bapak or Ibu followed by the name and write in formal Indonesian, bahasa baku. Colloquial forms such as nggak or udah do not belong in it.
Sources
The information is based on these sources. Check fees and dates with the provider before you register.