China's 183-day tax test: one trip, two day counts

Two offices inside the same government count a business trip differently. A Monday-morning-to-Friday-evening stay in China is three days under the individual income tax law’s own counting rule, and five days under the employment-income article that China writes into its double tax treaties.

The two counts are not rival readings of one number. They answer different questions. The domestic count decides whether a person is a Chinese tax resident for the year, which pulls worldwide income into scope. The treaty count decides whether China may tax a salary at all, given that the person is a tax resident somewhere else.

This piece lines up the five documents that set these tests, and works the arithmetic that the documents leave to the reader.

A calendar year decides residency; treaties use a rolling 12 months

Chinese tax residency is tested over one tax year, which runs from 1 January to 31 December (Individual Income Tax Law, art. 1, in force since 2019).

Two limbs make a resident: having a domicile in China, or having no domicile but spending 183 days or more inside China in that year. Everyone else is a non-resident, taxed on China-source income only. The same article defines the tax year as the calendar year, so the test resets each January and there is no carry-over of days.

Domicile is narrower than it sounds. The implementing regulations define it as habitual residence in China arising from household registration, family, or economic interests (State Council Order 707, art. 2, effective 1 January 2019). For a foreign passport holder with no Chinese household registration and no family settled here, the 183-day limb is the one that decides the answer.

A treaty counts the same 183 days over a rolling window rather than a calendar year. The tax administration’s own commentary on the employment-income article describes the test as 183 days “in any 12 months”, counted continuously or in aggregate (State Taxation Administration, art. 15 commentary). A rolling window can be crossed in July on days that a calendar-year count would have spread across two tax years.

Only days spent wholly inside China count

Days inside China are counted by the 24-hour clock, and both the arrival day and the departure day fall out of the total (MOF and STA announcement 2019 no. 34, art. 2, issued 14 March 2019).

The text is short: a day spent inside China for a full 24 hours counts toward the residence total, and a day spent inside China for less than 24 hours does not. A Friday evening flight out means Friday is not a China day. A Monday morning landing means Monday is not a China day either.

The tax administration published a worked example when the rule came out. A cross-border commuter who arrives on Monday morning and leaves on Friday evening gets credit for three days a week, because Monday and Friday are partial and the weekend is spent outside. Over 52 weeks that is 156 days, below the 183-day line, so the commuter stays a non-resident (MOF and STA joint Q&A, 16 March 2019).

Every trip pays a two-day toll at the boundary. On a commute that toll is most of the week.

The six-year clock starts at 2019 and 2025 was the first year it could fire

The exemption for foreign-source income lasts until six consecutive 183-day years, counted from 2019 (announcement 2019 no. 34, art. 1).

The mechanics sit in the regulations. A non-domiciled person whose 183-day years run for fewer than six consecutive years keeps an exemption for income sourced outside China and paid by a foreign employer, once the person has filed the required record with the tax office. Once the run reaches six consecutive years, that exemption stops (State Council Order 707, art. 4).

Because the start year is fixed at 2019 and earlier years were wiped, 2025 was the first year in which the six-year run could be complete. The tax administration said so directly at the time: through 2024 no non-domiciled person could have six qualifying years behind them (joint Q&A, question 3).

The window is the six years immediately before the year being tested. For a person whose 2026 position is being checked, the six years are 2020 through 2025.

An absence longer than 30 days restarts the run

A single absence of more than 30 days in any qualifying year resets the consecutive-year count to zero (State Council Order 707, art. 4).

The threshold is 30, not 30 or more. Thirty days away leaves the run intact; 31 days breaks it. That one-day difference is worth four years of worldwide tax to the profile below.

One year below 183 days postpones the worldwide test by six years

A year that falls short of 183 days removes itself from every window that contains it, and a window reaches back only six years (my arithmetic on announcement 2019 no. 34, art. 1).

Take a person resident since 2019 with one year, 2024, at 170 days. In 2025 the six-year window is 2019 to 2024 and contains the short year, so the exemption holds. The short year drops out of the window only when the window starts at 2025, which happens for the tax year 2031. The worldwide test therefore moves from 2025 to 2031, a delay of exactly six years.

The same logic runs the other way for someone who arrives later. An arrival in 2021 cannot complete six qualifying years before 2027, and the worldwide test cannot fall earlier than that.

What each status changes for a salary

Four positions produce four different slices of a salary being taxable in China (MOF and STA announcement 2019 no. 35, art. 2, 14 March 2019).

The regulations also keep a separate 90-day exemption, which covers China-source income paid by a foreign employer and not borne by a Chinese establishment (State Council Order 707, art. 5).

Two details in announcement 2019 no. 35 are easy to miss. Paid leave and training days taken during a China work period count as China work days when the salary is split between countries. And for someone working for both a Chinese and a foreign employer, a day inside China of less than 24 hours counts as half a China work day for that split — a third counting convention, sitting between the zero of the residence test and the full day of the treaty test.

Rates are the ordinary ones: 3% to 45% on comprehensive income in seven bands, starting above a 60,000 yuan annual deduction for residents, with a 5,000 yuan monthly deduction for non-residents (Individual Income Tax Law, arts. 3 and 6). Foreign tax already paid can be credited, capped at the Chinese tax on the same income (art. 7).

Treaties count arrival and departure days

Treaty counting keeps what the domestic rule discards: arrival days, departure days, partial days, and weekends or holidays inside China all count (STA commentary on art. 15).

Three conditions have to hold together before the source country loses its claim on employment income: the stay is 183 days or fewer in the treaty period, the pay is not from a resident employer of that country, and no permanent establishment there bears the cost. Announcement 2019 no. 35 repeats the conditions and ties the treaty route to the same income-splitting formulas.

Claiming it does not require prior approval. A non-resident who judges that the conditions apply can take the treaty position on the return, or through the withholding agent, and keep the supporting documents for later inspection (STA announcement 2019 no. 35, art. 3).

The expat allowance exemption runs to 31 December 2027

A resident foreign national may take the standard additional deductions or the older allowance exemption, but not both in a year (announcement 2023 no. 29, 18 August 2023).

The exemption covers housing, language training and children’s education allowances, and the choice is fixed for the tax year once made. The announcement sets its own expiry at 31 December 2027, which makes this the one deadline in the set that arrives before the six-year clock matters for most arrivals.

How I checked

Every clause was read in the issuing body’s own text: the law on the NPC site, the regulations on gov.cn, and the three announcements and two commentaries on gov.cn and chinatax.gov.cn. Article numbers in the tables come from those pages, not from secondary summaries.

The arithmetic is in a short script, days-183.py, that reproduces the tax administration’s 156-day example, counts the same three trips under both conventions, and walks the six-year window year by year. The four profiles in the second table are the script’s output. I wrote a naive counter first, which counted every calendar day touched; it overstates each trip by two days, and I kept the comparison in the table because that is the error the two conventions invite.

What I could not check

• Whether any 2026 announcement has modified announcements 2019 no. 34, 2019 no. 35 or 2023 no. 29. I read the texts as published and found no replacement, but I did not page through the tax administration’s consolidated index of current rules.
• How a local tax office applies the record-filing requirement in practice. The regulation requires it; the form and the timing are set below the level of the documents cited here.
• Which treaty wording applies to a specific nationality. China’s treaty network uses both the calendar-year and the rolling-12-month forms, and I checked the commentary rather than each of the hundred-odd texts.
• The interaction between the allowance exemption and a treaty position for the same salary. Both are permitted in principle; I found no worked example combining them.