TariffMonkee Taiwan Tax Residency Check

x402

TariffMonkee Taiwan Tax Residency Check is a paid API for AI agents from tariffmonkee.com, paid per call via x402, $0.06/call, status unknown (last checked 2026-10-27).

Determines Taiwan tax residency status (resident vs. non-resident) from arrival/departure dates and income, returning applicable withholding rates or estimated tax owed using official bracket rules

Price / call$0.06

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StatusUnknown

How this service works

Taiwan tax residency guidance (not tax advice) from arrival and departure dates and income: resident (183+ days) or non-resident under the official day-counting rule, the 6% and 18% non-resident withholding threshold, and an estimated tax for residents using that year's brackets. Treaty rates and AMT are flagged, not computed. Only the National Taxation Bureau determines liability.

Output

Returns Taiwan tax residency classification (resident if 183+ days, non-resident otherwise), exact day count using the official start-excluded/end-included rule, applicable withholding rates (6%/18% threshold for non-residents tied to 1.5x basic wage), or estimated tax owed using current-year brackets and deductions for residents, plus flags indicating whether DTA treaty rates or Alternative Minimum Tax may apply (not computed).

Example use cases

Foreign worker residency status check

“I'm a foreign professional who arrived in Taiwan on February 15th and plan to leave on November 30th, with an annual salary of NT$900,000 — am I a Taiwan tax resident this year, and what tax rate applies to me?”

Short-stay contractor withholding rate

“I was only in Taiwan from July 1st to September 20th earning NT$300,000 as a contractor — what withholding rate will my employer apply since I'm probably a non-resident?”

Year-end tax liability estimate

“I've been in Taiwan the whole year from January 1st to December 31st with a total income of NT$2,400,000 — can you estimate my Taiwan income tax owed using the current brackets and standard deductions?”

Technical details

Endpoint

POSThttps://tariffmonkee.com/paid/tax-residency-check?utm_source=zero.xyz

When to prefer

Use this endpoint when you need a quick, rules-based Taiwan tax residency classification and tax estimate for a specific individual based on physical presence dates and income — especially for foreign professionals, digital nomads, or contractors evaluating Taiwan tax exposure. Prefer this over generic tax calculators because it specifically implements Taiwan's official start-day-excluded, end-day-included counting rule and applies the correct NTB bracket structure. Not a substitute for official NTB determination or professional tax advice.

Side effects

Missing or unparseable arrival/departure dates returns an error
Overlapping or logically inconsistent date ranges may produce incorrect day counts
Income figures in unexpected currency or format may not be processed correctly
Edge-case year-boundary stays may require careful date input
No response if payment settlement fails via x402

Input

Schema · Request body

Field	Type	Description
age	number	Filer's age, for the 70+ exemption tier.
stays	array	Array of { arrival: 'YYYY-MM-DD', departure?: 'YYYY-MM-DD' }. Omit departure for a stay still ongoing.
married	boolean	Married filing status, affects the standard deduction.
dependents	number	Count of dependents claimed at the general exemption rate.
calendar_year	number	Calendar year to evaluate, e.g. 2026. Must have a verified row in the tax_year_params table.
gross_income_twd	number	Total gross income for the year in TWD.
residence_county	string	County/city of the filer's household registration (if has_household_registration is true) or ARC-registered residence address (if not), e.g. '臺北市'. Used only to determine filing jurisdiction.
tax_withheld_twd	number	Tax already withheld during the year, for a shortfall/refund estimate.
employer_location	string	'taiwan' or 'offshore'. Affects the 90-day anti-avoidance rule for non-residents.
monthly_salary_twd	number	Full-month salary in TWD, for the non-resident 6%/18% withholding check.
has_offshore_income	boolean	Whether material income was earned outside Taiwan. Only used to flag AMT as possibly relevant -- not computed.
spouse_is_taiwan_national	boolean	Whether the filer's spouse is a Taiwan national. Affects the joint-filing jurisdiction choice available to residents.
has_household_registration	boolean	Whether the filer holds Taiwan household registration (戶籍). Most foreign ARC holders do not. Affects filing jurisdiction only, not residency status or tax owed.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "sources": [
      "National Taxation Bureau of Taipei / Taichung Q&A pages on non-resident withholding (18%/6% rule, 90-day offshore-employer rule)",
      "Ministry of Finance CPI-triggered adjustment announcement for 115-nendo (2026) individual income tax brackets and deductions",
      "Income Tax Act (所得稅法) Art. 7 (residency definition) and Art. 5 (annual CPI-indexed adjustment mechanism)",
      "Ministry of Finance Tax Portal (etax.nat.gov.tw), 玖、外僑篇 -- foreigner filing jurisdiction guidance, updated 2026-04-15"
    ],
    "disclaimer": "Estimate and status aid, not tax advice. Only Taiwan's National Taxation Bureau (國稅局) determines final tax liability. This tool does not compute DTA treaty rates or the Alternative Minimum Tax (AMT): see out_of_scope.",
    "filing_note": "Residents generally must file a settlement return the following year (filing_deadline in the tax_year_params row for 2026 is not yet officially announced -- do not assume a date).",
    "verified_on": "2026-09-08",
    "withholding": null,
    "days_present": 222,
    "out_of_scope": {
      "amt": null,
      "dta_treaty_rates": "Not computed. Taiwan has ~34 tax treaties with reduced withholding on specific income types, gated on filing a Certificate of Residence with the payer beforehand. Confirm the specific treaty and procedure with a tax professional or the National Taxation Bureau.",
      "mid_year_status_change": "Residency status appears to have changed partway through the year. A settlement filing reconciling the pre- and post-183-day periods is required before departure (if leaving before filing season) or in the normal filing season. The split-period withholding calendar is not computed here."
    },
    "calendar_year": 2026,
    "filing_required": true,
    "residency_status": "resident",
    "status_reasoning": "222 day(s) present in 2026 (counted start-day-excluded, end-day-included per stay); threshold is 183 days.",
    "filing_jurisdiction": {
      "office": "Not determined -- 'residence_county' was not supplied.",
      "reasoning": "Citizens file with their household registration (戶籍) location's National Taxation Bureau. Foreign filers without household registration file based on the county/city registered on their ARC (居留證) as of the filing date -- supply 'residence_county' for a specific office.",
      "joint_filing_note": null
    },
    "offshore_90_day_flag": {
      "applies": false,
      "reasoning": "Does not apply: either resident, 90 days or fewer present, or employer is Taiwan-based."
    },
    "resident_tax_estimate": null
  }
}

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