綜所稅專業入門:稅務居民判定、所得來源與常見高風險情境

綜所稅結算申報的核心,通常不在於「是不是中華民國國民」,而在於三件事:

  1. 你當年度的身分是「稅務居民(居住者)」或「非稅務居民(非居住者)」
  2. 你的所得來源屬於台灣、兩岸(大陸)、或海外(含港澳)
  3. 你的所得型態屬於薪資/執行業務、利息、股利、租賃、財產交易、證券交易或中獎獎金等,適用不同課稅機制

本文以實務導向,協助企業主、跨境工作者與高資產人士用「一套判斷流程」快速建立正確觀念,避免因身分誤判或漏報而補稅受罰。

1. WHO|誰需要申報?先判斷稅務居民身分
1.1 判斷標準:看「稅務居民」,不是看國籍

台灣個人所得稅把個人分為 居住者非居住者,兩者在「課稅範圍」與「課稅方式」差異非常大。

1.2 稅務居民(居住者)常見認定邏輯

實務上可用下列規則快速判斷:

(一)無戶籍(通常指未設戶籍、無身分證)
同一課稅年度(1/1–12/31)在台居留合計滿 183 天以上,通常會被認定為居住者。

(二)有戶籍(多數情形會被視為在台「有住所」)
符合任一情形,通常會被認定為居住者:

  • 當年度在台 居住合計滿 31 天;或
  • 當年度在台 居住 1–30 天,但可被認定 生活及經濟重心在台灣

「生活及經濟重心」並非單一指標,而是綜合事實判斷,常見因素包含:

  • 享有健保、勞保、國保等社會福利
  • 配偶或未成年子女仍居住在台灣
  • 在台經營事業、執行業務、管理財產、受僱提供勞務或擔任董監/經理人
  • 其他足資認定重心在台的生活與經濟連結

Practical note : 許多台商以為一年只回台幾天就不是稅務居民,但若家人、健保與主要資產都在台灣,極大機率仍會被認定為「居住者」,須辦理結算申報。

2. 居住者 vs 非居住者:課稅範圍與課稅方式完全不同
2.1 居住者(稅務居民)
  • 以「申報戶」為單位辦理結算申報
  • 台灣所得通常納入綜所稅架構計算(部分所得另有分離課稅/扣繳抵稅等制度)
  • 海外所得(含港澳)可能涉及最低稅負(AMT/基本稅額),需另外檢核(見第 4 節)
2.2 非居住者(非稅務居民)
  • 原則上僅就「台灣來源所得」課稅
  • 多數台灣來源所得在給付時採「就源扣繳」(例如利息、股利、租金、佣金、執行業務報酬等)
  • 部分所得(例如某些需自行申報的所得、離境前結清等)需依規定另行申報
2.3 高資產人士常見差異點:同類所得,身分不同稅負可能落差很大

以「利息」為例,居住者可能落入累進稅率較高級距(40%);非居住者則多為固定扣繳率(20%)。也因此,實務上確實有人基於稅負與長期海外居住安排,進一步思考「身分配置」,甚至包含改變國籍等作法(曹興誠曾入籍新加坡籍)。

但就台灣綜所稅的「居住者/非居住者」判定而言,關鍵仍回到稅務居民認定規則

  • 若要落入「非居住者」課稅方式,通常必須把 在台居留天數控制在 183 天以下
  • 但對「有戶籍/在台有住所」者而言,即使未滿 183 天,仍可能因 31 天規則生活及經濟重心 而被認定為居住者。
3. 申報戶與受扶養:家庭結構會直接影響申報方式與風險
3.1 夫妻申報原則

夫妻原則上採共同申報;若涉及家暴、分居或其他特殊情形,可能依法改採其他申報方式。

3.2 受扶養親屬範圍(常見歸類)
  • 直系尊親屬:年滿 60 歲或無謀生能力
  • 子女/兄弟姊妹:未滿 20 歲;或滿 20 歲但在校就學、身心障礙或無謀生能力
  • 其他親屬或家屬:須符合年齡/能力要件,且實務上常需備妥同居或扶養事實證明
3.3 兄弟姊妹同時列報扶養父母的常見爭點

同一年度原則上不得由多名子女重複列報同一位直系尊親屬:

  • 家庭已協議者,通常依協議由其中一人列報
  • 協議不成者,實務上常以「共同生活、實際照顧與扶養事實」判斷(通常重視實際照顧而非僅匯生活費)
4. WHERE|所得來源:台灣/兩岸/海外(含港澳)的申報重點
4.1 台灣來源所得
  • 居住者:原則納入綜所稅架構(視所得性質,可能有分離課稅或扣繳抵稅)
  • 非居住者:多採就源扣繳;部分情形需依規定自行申報或離境前結清
4.2 大陸來源所得

大陸來源所得並不等同於「海外所得(AMT)」的處理邏輯。
實務上,台灣地區人民若有大陸來源所得,通常需 併入當年度綜合所得總額申報;且若已在大陸繳稅,可能依規定申報扣抵(需具備合格完稅證明並完成驗證程序)。

4.3 海外來源所得(含港澳):最常見的誤解與最低稅負(AMT)

常見誤解是「海外所得不用報」。正確觀念是:

  • 以同一申報戶為基礎,全年海外所得合計達 100 萬元以上者,海外所得需全數計入基本所得額評估
  • 但「要申報」不等於「一定要繳基本稅額」:仍需看個人基本所得額是否超過免稅額(113 年度起為 750 萬元),再計算基本稅額

高資產申報戶的風險往往不在「海外所得有沒有扣繳」,而在於:

  • 海外所得是否被正確分類與彙總
  • 是否一併檢核基本所得額項目(例如特定保險給付、特定有價證券交易所得、選擇分開計稅之股利等)
5. WHAT|所得類別與高風險情境

所得分類的價值在於:它直接決定 是否就源扣繳、是否分離課稅、是否納入 AMT、可否列必要費用、申報表如何填。以下整理最常見類型與高風險情境:

5.1 勞務所得:薪資 vs 執行業務(顧問費)最容易被「實質課稅」調整
  • 薪資所得:受僱關係,通常由雇主辦理扣繳與申報
  • 執行業務/稿費/顧問報酬等:形式上可列必要費用(依規定或核實),但若實質上屬受僱性質,仍可能被調整回薪資所得補稅
    風險點:國稅局會依據「從屬性」判斷。若您必須打卡、接受監督且不承擔盈虧,即便簽約名目為顧問,仍會被調回薪資並處以補稅罰鍰。
5.2 租賃所得:無償借用、低租金與「設算租金」風險

房屋無償提供他人使用,或租金顯著偏離行情時,可能產生「被設算租金收入」的風險,尤其是:

  • 無償提供「非本人、配偶及直系親屬」使用,且供營業或執行業務使用
  • 或供他人住家使用但未依規定備妥契約與公證等文件而無法證明無償借用事實

風險點:以為「沒收租金就不用報」,但稅務上可能被認定仍有租賃所得。


5.3 財產交易/證券交易所得:未上市櫃股票是高資產最常見雷區

個人出售未上市(櫃)公司股票,所得性質會因「是否依法完成法定發行簽證」而不同:

  • 已依法簽證發行:屬「證券交易所得」,並列入「個人基本所得額」檢核(AMT)
  • 未完成法定簽證發行:屬「財產交易所得」,需併入綜所稅申報
    風險點:誤以為「證所稅停徵=不用申報」,事實上,轉讓未上市、未上櫃公司股份之所得,已全面納入個人基本所得額(AMT)檢核。
6.快速試算:114 年薪多少免繳稅?(115 年申報適用)

若僅有薪資所得且採標準扣除額,以下年薪區間可能「免繳稅」:

申報身分 免稅額+標扣額+薪資特扣額 免繳稅年薪上限 (估計)
單身族 9.7萬 + 13.1萬 + 21.8萬 44.6 萬元
雙薪夫妻 (無子女) (9.7萬x2) + 26.2萬 + (21.8萬x2) 89.2 萬元
雙薪 4 口之家 (含2幼兒) 基本免稅+標扣+薪資+幼兒特扣 146.1 萬元起

註:幼兒學前扣除額第一胎 15 萬,第二胎以上每人 22.5 萬,此處以二寶家庭試算。

7. 實務建議:四步驟自我查核
  1. 身分健檢: 盤點當年度出入境紀錄,若在台有戶籍,回台天數是否觸發居住者身分?
  2. 所得分類: 將所得按「來源地」分三類,再按「性質」分類,特別留意未上市櫃股權交易之文件留存。
  3. AMT 預警: 若有大額保險給付、海外投資獲利或出售股權,應提早進行最低稅負制的模擬計算。
  4. 保存「成本」憑證: 尤其是財產交易(賣房、賣未上市股票),有憑證(買價、裝修、手續費)才能核實減除所得,否則國稅局會用較高的部頒比例設算。
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Establishment of a Taiwan Branch by Foreign Entities: Process & Required Documents

1) Phase 1: Pre-operation Preparation and Qualification Review from Abroad

  1. Company Name Reservation and Scope of Business Pre-examination (Administration of Commerce, Ministry of Economic Affairs)
  • Priority must be given to the Chinese translation of the foreign parent company's name. The fixed format must prepend "Foreign Merchant [Nationality of Parent Company]" and append "Taiwan Branch" (e.g., Foreign Merchant ○○ Co., Ltd. Taiwan Branch).
  • Required items :1–3 proposed company names; 2–10 business items (negative list).
  1. Document Preparation for Foreign Parent Company
  • Required Documents :
    • Foreign Corporate Qualification Proof Documents (direct submission of official copies): Certificate of Corporate Qualification, official registration/declaration documents required for anti-money laundering (AML) as mentioned above, register of directors/shareholders, and copies of passports or identification documents of relevant personnel.
    • Foreign Capital Status Declaration: Must be physically signed by all relevant personnel, certifying that they do not hold Mainland China capital status and comply with laws and regulations (if the Person in Charge and the Manager are different people, both must sign separate forms).
    • Power of Attorney (POA): Must be stamped with a page-spanning seal (if different people, the POA must explicitly state the dual authorization text).
  • Direct Submission: Authorized signatories can sign and seal directly, and submit for review "without undergoing any notarization or legalization beforehand." In practice, there is a very high probability of direct approval and issuance of the Phase 1 Supplementation Letter. (Note: If the competent authority randomly checks and requests legalization later, you can then commission a local notary public and verify it through the overseas mission/office.)
  1. Submission of Phase 1 Registration: Requesting the "Operating Capital Supplementation Letter"
  • Process:Submit the approved Name Reservation Form, the identity documents of both parties mentioned above, the POA, and foreign corporate qualification proof documents to the "Administration of Commerce, Ministry of Economic Affairs" for review.
  • Result:Successfully obtain the "Phase 1 Supplementation Letter" from the Ministry of Economic Affairs.

2) Phase 2: Localizing Taiwan Identity and Bank Account Opening

  1. Obtaining the Visa and UI Number
  • Process:Process: The person opening the account in Taiwan (usually the Manager) applies for a Taiwan visa ➔ obtains a valid resident or visitor visa (or relevant entry/exit permit). After entering Taiwan (or via the online system), present the passport and relevant visa to the National Immigration Agency, Ministry of the Interior, to apply for the "Record of UI Number for Foreign Nationals."
  • Note: If the Person in Charge and the Manager are different people, the big boss remaining abroad (Person in Charge A) must still commission a Taiwan agent via paper documents to apply to the Immigration Agency for Person A's own "Record of UI Number." The UI numbers of both individuals must be ready at the time of submission.
  1. Pre-examination of Taipei City Business Premises Address and Signing Lease Agreement
  • Business Premises Address Pre-examination (Department of Urban Development / Building Administration Office): Taipei City strictly enforces land use zoning regulations. Before officially signing a lease agreement, make sure to submit an address pre-examination through the "Taipei City Commercial Office Business Premises Review System" to avoid failing registration later due to non-compliance, which could result in a total loss of high deposits, rent, and decoration costs.
  • Required items :Building Ownership Certificate or Building Registration Transcript (Category 2 Transcript).
  • Signing Lease:Formally sign a contract with the landlord after passing the pre-examination (the lease should state that it is for the branch office's business use).
  • Documents to Obtain:Building owner's consent letter and a copy of the latest house tax bill (or ownership certificate).
  1. Opening a Bank "Preparatory Office" Account for the Branch
  • Account Name:The format is fixed as "Foreign Merchant [Parent Company Name] Co., Ltd. Taiwan Branch Preparatory Office".
  • Required items :Required items: Original copy of the "Supplementation Letter" from the Administration of Commerce, the approved Company Name Reservation Form, original IDs of the account opener (passport, Record of UI Number, relevant visa), (if different people, add Person in Charge A's passport and Record of UI Number), original POA from the parent company explicitly authorizing account opening, parent company foreign corporate qualification proof documents, registers of shareholders/directors, ownership structure chart of ultimate beneficiaries, and the preparatory office small stamp for bank use (usually the Manager's personal stamp if they are different people).

3) Phase 3: Influx of Capital and CPA Certification

  1. Inward Remittance of "Operating Capital" and Foreign Exchange Settlement (Bank)
  • Process:Process: The foreign parent company account remits the operating capital into the preparatory office account in Taiwan.
  • Attention:During foreign exchange settlement, you must request and safely keep the "Inward Remittance Advice" and "Foreign Exchange Purchase Memorandum" (the nature of settlement must be marked as "310 Operating Capital"). The beneficiary name must perfectly match the branch office name.
  • Applying for Balance Certificate:On the day following the deposit of operating capital, apply to the bank for a Certificate of Deposit Balance.
  1. CPA Audit and Certification of Operating Capital
  • Legal Basis:According to Article 5 of the Regulations Governing Certified Public Accountants' Auditing and Certification of Registered Capital of Companies, the establishment of a branch office must be certified by a CPA.

Required items :Required items: Original Bank Certificate of Deposit Balance, copy of the preparatory office bankbook cover, stamped page, and inner pages (including remittance and settlement records), copies of the Inward Remittance Advice and Foreign Exchange Purchase Memorandum, copy of the Ministry of Economic Affairs Supplementation Letter, parent company foreign corporate qualification proof documents, and the branch office establishment registration form.

4) Phase 4: Final Approval and Launch of Daily Operations

  1. Submission of Phase 2 Supplementation ➔ Obtaining the Unified Business Number (UBN)
  • Process:Process: Return the "Inward Remittance Advice," "Foreign Exchange Purchase Memorandum," "CPA Capital Audit Report," along with the Records of UI Number, passports, ID copies of relevant personnel, and physically signed declarations/letters of undertaking to the Ministry of Economic Affairs for supplementation.
  • Result:Result: Officially receive the approval letter for the establishment of the foreign company's Taiwan branch and obtain the Unified Business Number (UBN).
  1. Business Registration (Tax Registration) (National Taxation Bureaus, Ministry of Finance)
  • Process:Process: Apply for tax registration at the local National Taxation Bureau branch or office where the branch is located to obtain the business tax filing status.
  1. Activation of Invoices
  • E-Invoices:Register on the Ministry of Finance's E-Invoice Integrated Service Platform and apply for e-invoice track numbers.
  • Paper Invoices:Apply to the National Taxation Bureau for a "Unified Invoice Purchasing Certificate" to purchase paper invoices.
  • Required items :Required items: Original approval letter from the Administration of Commerce, original company registration form, original tax registration approval letter, original dual IDs of the person in charge, official company stamps (large and small), invoice stamp, etc.
  1. Converting "Preparatory Account" into "Official Company Account" (Bank)
  • Process:Process: The account opener goes to the original bank to officially rename and convert the preparatory office account into an official branch office bank account. Only at this stage can funds be freely utilized.
  • Required items :Required items: Original approval letter from the Ministry of Economic Affairs, original branch office establishment registration form, copy of the tax registration approval letter, dual IDs of the account opener, and official corporate stamps (large and small).
  1. Subsequent Daily Operations Work
  • 14.1 Certification for Administration and Commerce (MOEACA IC Card):Apply at the MOEA Certification Authority for online tax filing, labor/health insurance, e-invoicing, and other operations.
  • 14.2 Import/Export Exporter/Importer Registration:If engaged in trading business, register with the International Trade Administration, Ministry of Economic Affairs. According to Article 4 of the Regulations Governing Registration of Exporters and Importers, the English name of the branch must indicate its nationality and branch status (e.g., must include the nationality name and the "Taiwan Branch" text), otherwise it will be rejected.
  • 14.3 Establishing Insured Units:Set up labor insurance, health insurance, and labor pension contribution accounts with the Bureau of Labor Insurance and the National Health Insurance Administration.
  • 14.4 Work Permit and Residency: Apply to the Ministry of Labor for a foreigner work permit for the branch manager. Once obtained, the manager can apply to or change their long-term Alien Residence Certificate (ARC) at the Immigration Agency to legally reside, work, and live in Taiwan.