Taiwan Income Tax for Foreigners: The 183-Day Line and What It Changes

The 183-day line

Taiwan decides how to tax your employment income with one blunt instrument: days of physical presence in a calendar year.

• Fewer than 183 days in the year → you are a non-resident for that year. Employment income is taxed by flat withholding at the non-resident rate, and you generally do not get the deductions residents enjoy.
• 183 days or more → you are a tax resident for that year. Your income is taxed on progressive rates with standard deductions and exemptions, reconciled through an annual filing.

Three things people misread about this rule:

1. It resets every calendar year. Arriving in August means you will almost certainly be a non-resident for your first partial year even if you stay for a decade after — plan for heavier withholding on those first months’ pay.
2. Days are counted from immigration records, not your lease or contract. Trips abroad subtract from the count. If you hover near the line, your passport stamps decide your status.
3. Residency for tax is separate from residency for immigration. Holding an ARC does not make you a tax resident; the day count does.

As of August 2026. Rates, thresholds and deduction amounts are set annually — the National Taxation Bureau’s English pages and the eTax portal are the reference points, and the numbers here are structural, not a substitute for the current tables.

Withholding: what your first payslips will show

Taiwanese employers withhold tax from salary as they pay it, and the withholding treatment follows your expected residency status.

While you count as a non-resident (typically your first months), employers withhold at the flat non-resident rate on salary — noticeably heavier than what a resident with deductions ultimately owes. There is a lower flat rate for earners under a monthly threshold tied to the minimum wage multiple, so lower salaries are not all treated identically. Either way, expect your early payslips to look worse than your steady-state.

Once you cross into resident treatment, withholding switches to the resident schedule (or a flat percentage election), and the annual filing reconciles everything.

The good news: over-withholding comes back. If you end the year as a resident, the excess withheld during your non-resident months is settled at filing — this is why many foreigners’ first Taiwanese tax filing produces a refund. The refund is paid into a local bank account, which is one more reason to have one open.

Freelancers and contractors face withholding by their Taiwanese payers at source, at rates depending on income type, and reconcile at filing like employees. Income paid from abroad for work performed while physically in Taiwan is generally Taiwan-source income — the “paid offshore so it’s invisible” assumption is a compliance risk, not a plan.

Keep every withholding statement your employer or payers issue — they are the inputs to your filing.

The May filing season

Resident taxpayers file an annual return during the filing window — May is the season — covering the previous calendar year.

Where foreigners file: the National Taxation Bureau offices operate dedicated foreign taxpayer service counters (Taipei’s is well used to first-timers), and the eTax portal supports online filing, with foreigner login options tied to your ARC/UI number. First-time filers often find the counter route easier: staff calculate options on the spot.

What to bring or have ready

• ARC and passport — the passport matters because entry/exit records prove your day count
• Withholding statements from employers and payers
• Bank account details for the refund
• Documents for any deductions you claim (dependents, insurance, rent, donations — categories the current-year tables define)

How the calculation works, structurally: gross income → minus exemptions and deductions (standard or itemised, plus a special deduction for salary earners) → taxable income → progressive brackets. The bureau’s calculator and counter staff will compute both standard and itemised routes and apply the better one — you do not need to master the tables to file correctly.

Special regimes worth knowing exist

• Foreign special professionals (including Gold Card holders) may qualify for a partial exemption on high salaries for their first years under the talent-attraction rules — conditions apply, claim it at filing, verify current terms
• Tax treaties — Taiwan has agreements with a number of countries that can affect double-taxation outcomes; whether your country is one, and what it covers, is a check worth doing once

Leaving, arriving, and the mistakes that cost money

Arriving late in the year — you will likely be a non-resident for that year. Nothing to fix; just expect flat withholding and know that the following full year is when resident treatment and the May filing begin mattering.

Leaving Taiwan permanently — do not just fly out. A departing taxpayer can file before leaving for the current year (the bureau handles early filing for departures); settle any balance and route the refund to an account you keep open or handle per the bureau’s guidance. Leaving unfiled income and an expired ARC behind creates exactly the mess you would expect if you ever return.

The classic mistakes

1. Assuming ARC = resident. The day count decides, per calendar year.
2. Ignoring the first-year flat withholding and being surprised by thin payslips — budget for it.
3. Not keeping withholding statements — reconstructing them at filing time is possible but slow.
4. Skipping filing because “tax was already withheld.” Residents generally must file; withholding is a prepayment, not a substitute, and skipping usually means forfeiting your own refund at best.
5. Working remotely on foreign payroll and assuming Taiwan doesn’t apply — physical presence while working generally makes it Taiwan-source; get advice rather than assumptions if this is your setup.

For anything beyond a plain salary situation — equity compensation, dual contracts, treaty questions — a local accountant for one filing season is cheap insurance.