China's 183-Day Rule & the 6-Year Worldwide-Income Trap

China taxes a foreigner on worldwide income only after they have been a tax resident, present 183+ days in a calendar year, for six consecutive years, and only if no single year in that run included a trip abroad of more than 30 consecutive days. Break the streak with one 31-day absence and the six-year clock resets to zero. Until you cross that threshold, China generally taxes you on China-source income only.

This is the heart of the so-called China 6 year rule (formally the "six-year rule" under China's Individual Income Tax (IIT) framework, in effect since the 2019 reform that replaced the older five-year rule). For most foreign workers it is the single most valuable planning lever in the Chinese system, and the easiest to break by accident.

Step 1: the 183-day residency test

Before the six-year rule matters at all, you have to be a Chinese tax resident in the first place. Under the IIT Law, an individual without a domicile in China becomes a resident for a given year if they are present in China for 183 days or more during that calendar year. Spend fewer than 183 days and you are a non-resident for that year, taxed only on China-source income, and that single year does not count toward the six-year streak.

• 183+ days in a calendar year → tax resident for that year (worldwide income exposure, subject to the six-year rule below).
• Fewer than 183 days → non-resident for that year; only China-source income is taxed, and the year breaks the consecutive-year count.
• "Domicile" in China is a separate concept, habitual residence due to household registration, family, or economic ties. People domiciled in China (typically Chinese nationals) are full worldwide-income residents regardless of day count, so the six-year rule is aimed squarely at non-domiciled foreigners.

China uses a strict midnight-presence rule for the 183-day test: a day counts toward residency only if you are physically in China at the end of that day (24:00). Days you arrive and leave on the same calendar day, and the arrival and departure days of short trips, are treated as less-than-24-hour days and are not counted. This is generally more taxpayer-friendly than the US or UK, where partial days usually count toward the threshold.

How the six-year clock works

Crossing 183 days exposes you to worldwide-income taxation in principle, but the six-year rule gives non-domiciled foreigners a long grace period. For your first six consecutive years as a resident, China only taxes your China-source income plus foreign-source income that is paid by a Chinese entity or individual. Your genuinely foreign income, say a foreign rental property, foreign investment dividends, or salary paid by an overseas employer for overseas work, is exempt during that window.

It is only from the seventh year onward, if you have been resident (183+ days) for six straight years without a break, that China can tax your full worldwide income for that seventh year. People sometimes call this the "year-7 worldwide-income trap."

Note that the six years are counted only from years in which you were actually resident (183+ days). A year under 183 days both breaks the streak and does not add to the count, see the reset mechanism below.

The >30-day absence: how to reset the clock

Here is the mechanism that makes the six-year rule manageable. In any of the six years, if you make a single trip outside China of more than 30 consecutive days, the consecutive-year count is wiped and restarts from zero. After that reset, you get a fresh six-year runway before worldwide-income taxation can apply again.

• It must be one continuous absence of more than 30 days, i.e., 31+ days outside mainland China in a single stretch. Several short trips that add up to 30+ days do not reset the clock.
• The reset is based on consecutive days abroad, so the trip can straddle a calendar-year boundary as long as it is one unbroken absence.
• A year in which you are simply present fewer than 183 days also breaks the streak, but the clean, deliberate tool is the single 30-day-plus trip.
• After a reset, the counter starts over: you begin a brand-new run of up-to-six exempt years.

What counts as a China day

Two different day counts are in play, and confusing them is a common mistake. The 183-day residency test uses the strict midnight rule (you must be in China at 24:00 for the day to count). The 30-day reset counts consecutive days abroad, measuring time outside mainland China, not time inside it.

A few practical points worth knowing:

• Hong Kong, Macau, and Taiwan are treated as outside mainland China for these purposes, so trips there generally count toward a 30-day-plus absence and don't count as China residency days.
• Days arriving and departing on short trips usually fall short of the 24-hour midnight test and so are not counted as residency days.
• Layovers and same-day transits don't count as China days, see our notes on layovers and partial days.
• Because two clocks run at once, casual mental math is risky. A day-counter that logs each entry and exit, and flags any single absence crossing 30 days, is the safe way to manage this.

Rates, treaties, and foreign income

Resident IIT on comprehensive income (salary, wages, author's remuneration, royalties, and similar) is taxed on a progressive scale, with separate schedules for business income and for passive income like dividends and capital gains. China also has an extensive network of double-tax treaties, and a treaty tie-breaker can resolve cases where two countries both claim you as resident. If you are sent to China by a foreign employer, treaty relief and the source rules can matter as much as the six-year rule itself.

Historically, expatriates in China have also relied on tax-exempt benefits-in-kind (housing, children's schooling, language training, home-leave flights) instead of the standard deduction. These preferential allowances have been subject to phase-out timelines, so check the current rules before assuming they apply, and weigh them against the six-year planning above.

Track the two clocks correctly

Tax Days tracks Chinese presence against the 183-day residency line for each calendar year and counts consecutive years for the six-year worldwide-income threshold, while flagging any single trip abroad that crosses the 30-day reset. The exported per-year history gives you the contemporaneous evidence you'd want if your residency status is ever reviewed. For the broader picture, see our 183-day rule guide and the expat day-counter guide.