Before you start

Know your residence position: more than 182 days in Cambodia in a rolling 12-month period
An employer registered with the General Department of Taxation, if you are employed
Records of any income from outside Cambodia
Awareness that Cambodia's double-tax treaty network is small

Step-by-step

1
Count your days on a rolling basis
You are a Cambodian tax resident if you are domiciled here, have your principal place of abode here, or are present for more than 182 days in a 12-month period. The rolling framing matters for people who spend the wet season elsewhere — a pattern of six months here and six months away needs actually counting, not estimating.
OnlineWho: YouOngoingFree
2
Check your employer is actually registered
Tax on Salary is withheld and remitted by registered employers. In a town with a lot of small hospitality and tour businesses, informal or unregistered employment is common. Ask to see the withholding on your payslip; if there is no payslip, that is the answer.
Via employerWho: YouAt the start of employmentFree to ask
3
Understand the rates that apply to you
Residents pay progressively: nothing on the first 1,500,000 riel of monthly salary, then 5%, 10% and 15% bands, reaching 20% above 12,500,000 riel. Non-residents pay a flat 20% on Cambodian-source salary, and for them it is a final tax with no bands and no threshold.
OnlineWho: YouOnceWithheld from salary
4
Get your benefits treated properly
Accommodation is very often part of a Siem Reap hospitality package. Fringe benefits are taxed at a flat 20% of value, borne by the employer. Ask in writing how any housing, meals or transport element of your package is being handled before you accept it.
Via employerWho: You and your employerAt offer stage20% on the value of the benefit
5
Deal with income from abroad deliberately
Cambodian residents are assessable on salary whether Cambodian- or foreign-sourced; non-residents only on Cambodian-source salary. Many remote workers in Siem Reap are paid entirely from abroad and have never looked at this. Enforcement has been light, but that is a description of practice, not a rule — take Cambodian advice if the amounts are meaningful.
OnlineWho: You (with an adviser)Before your first full tax yearAdviser's fee

Documents you’ll need

Passport with entry and exit stamps — your day count evidence
Employment contract showing salary and any benefits
Payslips showing Tax on Salary withheld
NSSF deduction records
Records of foreign income and any tax paid abroad

Things most newcomers don’t know

The 182-day test is rolling, which matters enormously to seasonal residents.

Cambodia tests presence over any 12-month period, not the calendar year. Siem Reap has an unusually large population of people who live here through the high season and leave for the rains — a pattern that can put you over 182 days on a rolling basis while a calendar-year count says otherwise. If your life has a season, count deliberately in both directions.

Source: PwC Worldwide Tax Summaries — Cambodia residence

Non-residence is the expensive option, not the cheap one.

A non-resident pays a flat 20% final tax on Cambodian-source salary from the first riel, with no bands and no threshold. A resident on a typical Siem Reap salary pays nothing on the first 1,500,000 riel a month and single-digit effective rates well beyond it. People assume avoiding residence saves money; here it usually costs money.

Source: PwC Worldwide Tax Summaries; Cambodian Law on Taxation

Cash-in-hand employment is common here and it is not neutral.

A great deal of Siem Reap's tourism work is informal. Being paid in cash by an unregistered employer means no Tax on Salary withholding, no NSSF enrolment, no payslip and — critically — nothing to support a work permit or a long EB extension. Since the 2024 tightening links the visa to the work permit, informal employment now has an immigration consequence as well as a tax one.

Source: MLVT / FWCMS; community-reported

There is no annual return, so nothing prompts you to check anything.

Because Tax on Salary is withheld monthly and employees never file, no moment in the year forces a review of your residence position, your benefits treatment or your foreign income. Errors persist for years unnoticed. Book your own annual check even though the state never asks for one.

Source: General Department of Taxation; Acclime Cambodia

Common mistakes to avoid

Counting 182 days against the calendar year when the test is rolling
Assuming non-residence is cheaper — it is a flat 20% with no threshold
Taking cash-in-hand work and finding it will not support a work permit or a long extension
Not checking how a hospitality package's accommodation element is being taxed
Assuming a double-tax treaty exists between Cambodia and your home country
Relying on this guide rather than a Cambodian adviser once your position is more than a plain salary

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.