How does Taiwan's National Taxation Bureau find overseas income and overseas assets — and is a Singapore account visible?

Two ledgers: the annual overseas income while he is alive, and the overseas assets that enter the estate

The heir typing this question is asking about two different taxes with two different statutes and two different clocks, and conflating them is why the answers he finds contradict each other. The first ledger is annual. Article 12, paragraph 1, subparagraph 1 of the Income Basic Tax Act adds to an individual's basic income the non-ROC-source income that was not included in consolidated gross income, with an express floor: where the household's total of such income for the year is under NT$1,000,000, it is not counted at all. That subparagraph has applied since 1 January 2009 by the article's own final paragraph. Article 13 then deducts a fixed amount from basic income and taxes the remainder at 20 per cent, allowing a credit for income tax already paid in the source jurisdiction on production of that authority's receipt for the same year, authenticated by an ROC mission or an authorised institution, capped at the increase the foreign income caused. The statute prints NT$6,000,000 as the deduction; the figure actually applied is the indexed one, NT$7,500,000, stated in that form by the Ministry of Finance tax portal's minimum-tax page updated 15 April 2026 and by the National Taxation Bureau of Taipei's basic-tax page updated 27 April 2026, which writes the computation as basic income less NT$7,500,000, times 20 per cent. The Ministry's announcement of 27 November 2025 for the 115 income year explains why it did not move: the applicable average consumer price index had risen 4.13 per cent against the index used at the last adjustment, short of the 10 per cent trigger.

The second ledger opens on the day of death and is not indexed to anything the father did with his income. Article 1 of the Estate and Gift Tax Act levies estate tax on the entire estate, inside and outside the territory, of an ROC national habitually resident in the ROC; article 23 requires the return within six months of death, filed with the authority for the district of household registration. The Singapore balance is in that base whether or not a single dollar of income from it was ever declared, and the site's page on whether Taiwan taxes a father's overseas assets sets out the habitual-residence test and the rate arithmetic. The two ledgers do not talk to each other inside the family, and that is the whole problem: an heir who files honestly in month six is filing a document that describes, in a number, how large an account was during years for which the income side may say nothing at all.

The routes by which the bureau actually sees a Singapore account

Start with what does not exist, because most of the anxiety lives there. Taiwan's automatic exchange of financial-account information under the Common Reporting Standard runs with three counterparties. The Ministry of Finance announced the United Kingdom's addition on 16 April 2021 and described the September exchange as being with the reportable jurisdictions Australia, Japan and the United Kingdom; its statistics release for the 114 filing year, on the page carrying an update date of 13 July 2026, records that CRS filing closed on 30 June 2026 with 1,887 financial institutions reporting accounts held or controlled by tax residents of Australia, Japan or the United Kingdom, for exchange in September 2026. The same release states the Ministry's own practice: information received through exchange is not used directly to assess tax, but as a reference for evaluating evasion risk and selecting cases. The Ministry also maintains a separate and much longer participating-jurisdictions list — 110 jurisdictions as of its announcement of 6 July 2022 — which governs due diligence on investment entities, not the sending of data. Participating and reportable are different words doing different jobs, and a page that blurs them will frighten the wrong families and reassure the wrong ones.

The route that did change is bilateral and it is new. The agreement between the Taipei Representative Office in Singapore and the Singapore Trade Office in Taipei for the elimination of double taxation with respect to taxes on income was signed at Singapore on 31 December 2025 and, the Ministry of Finance announced on 13 February 2026, entered into force that day, applying generally to income from 1 January 2027; the 1981 exchange of letters ceases for everything the new agreement covers. Three of its provisions matter here. Article 2, paragraph 3 lists the Taiwan taxes covered, and names the income basic tax alongside the profit-seeking enterprise and individual income taxes — the minimum-tax ledger is inside the agreement by name. Article 26, paragraph 1 requires exchange of information foreseeably relevant to the administration or enforcement of domestic laws concerning taxes of every kind and description, and says in terms that the exchange is not restricted by articles 1 and 2. Paragraph 5 provides that neither side may decline to supply information solely because it is held by a bank, other financial institution, nominee or person acting in an agency or fiduciary capacity, or because it relates to ownership interests in a person. And article 28 sets a timing rule most summaries omit: article 26 applies to requests made on or after the date of entry into force, concerning information for taxes relating to taxable periods beginning on or after 1 January 1982. The channel opened in February 2026; what it can be asked about did not open in February 2026.

Then the domestic routes, which are older and closer to home. Money that left Taiwan left a declaration behind it. Under the Regulations Governing the Declaration of Foreign Exchange Receipts and Disbursements or Transactions, an individual converting the equivalent of US$500,000 or more in a single settlement must attach the contract, approval letter or other supporting documents and have the bank confirm them against the declaration form (article 5, subparagraph 2); an individual whose cumulative annual purchases or sales of foreign exchange exceed the equivalent of US$5,000,000 needs prior central bank approval through the bank (article 6, paragraph 1, subparagraph 1); and the bank must keep the declaration forms and documents available for audit and inquiry for at least five years (article 8, paragraph 2). Separately, article 30 of the Tax Collection Act empowers the tax authority, or an investigator designated by the Taxation Administration, to require any agency, organisation or individual to produce books, documents and other relevant files for the purpose of investigating taxation data, and provides that the person investigated may not refuse — subject to paragraph 2, which confines the investigation to what the taxation purpose necessarily requires. And on the estate side there is a service the family will use itself: the single-window inquiry into a decedent's financial assets, operated under Ministry of Finance guidelines last amended on 26 December 2023, open to heirs who have not renounced, executors and estate administrators, with responding institutions required to transmit results within ten working days and the data downloadable from 30 to 90 days after application. Read its scope: the responding bodies are the Bankers Association of the ROC and its member institutions and nine further categories of domestic association. The one-stop query that finds every deposit, policy, fund and safe-deposit box in Taiwan does not reach Singapore, and never claimed to.

The clocks: five years, seven years, and the door marked voluntary disclosure

Article 21 of the Tax Collection Act fixes the assessment period, and the difference between its two numbers is the whole of this page. Where the tax is one the taxpayer must file and pay, the return was filed within the prescribed period, and there was no intentional evasion by fraud or other improper means, the period is five years. Where the return was not filed within the prescribed period, or tax was evaded intentionally by fraud or other improper means, it is seven. Within that period a newly discovered liability is still assessed and may still be penalised; outside it, no further assessment or penalty is possible. Article 22 says when the clock starts: from the date of filing where the return was filed on time, and from the day after the filing period expired where it was not. So the ordinary Taiwanese household that files its consolidated return each May and declares nothing overseas is on a five-year clock only for as long as the omission is not characterised as intentional. A non-filing is seven from a later start date. The arithmetic compounds quietly: an omission the family thinks is four years old can, on the seven-year branch, still be assessable eight or nine years after the money moved.

Article 48-1 is the door the statute leaves open, and it closes on its own. A taxpayer who voluntarily files a supplementary return and pays the omitted tax to the tax authority is relieved of the penalties in articles 41 to 45 and of the evasion penalties in every tax act, and where criminal liability is involved the punishment may be remitted — but only where the case has not been reported by an informant and is not already under investigation by the tax authority or by an investigator designated by the Ministry of Finance. The price is interest: the supplementary tax carries daily interest from the day after the original payment deadline to the day of payment, at the one-year postal savings fixed time-deposit rate on 1 January of each year, collected together with the tax. Two features of that provision decide behaviour. It is available before an inquiry begins and not after, so its value falls to zero on the day a letter arrives. And it applies to the omitted tax, not to the account — the family is not disclosing a structure, it is filing years.

The Singapore side, and the exposure that is not detection

Singapore's machinery is public and it is worth reading rather than imagining. IRAS states that Singapore has been exchanging financial account information with partner jurisdictions under the CRS since September 2018, and that it has committed to the amended CRS with exchanges expected to commence in 2028. Its List of Reportable Jurisdictions, updated 2 February 2026 for 2025 reporting with returns due from reporting Singapore financial institutions by 31 May 2026, does not include Taiwan; neither does its List of Participating Jurisdictions effective from the same date. The architecture explains why. Part 20B of the Income Tax Act 1947 implements Singapore's obligations under an international tax compliance agreement, which section 105K defines as an agreement the Minister declares by order — a competent authority agreement with the government or the corresponding authority of another country. No such order, no automatic feed. Where a person is prescribed, section 105L(1) requires the information and section 105L(2) removes the excuse: the prescribed person is not relieved of the duty merely because a written law, a rule of law, a contract or a rule of professional conduct forbids the disclosure. That is also why a trust is not outside the system by nature. IRAS's CRS FAQs treat a trust as capable of being a financial institution in its own right and, in answer B.2, updated 31 October 2025, resolve a trust's residence by the trustee's — a trustee resident in Singapore, or incorporated, effectively managed or financially supervised there, brings the trust inside the reporting perimeter, with controlling persons identified where an account holder is a passive entity.

The request route sits in the neighbouring Part. Part 20A of the same Act governs exchange of information under a double taxation arrangement containing an exchange-of-information provision. Section 105A(2)(b) states plainly that a reference to the tax position of a person includes the tax position of an individual who has died. Section 105F applies the Comptroller's ordinary information-gathering powers under sections 65 to 65D for the purpose of complying with a request, and section 105G lets him draw on the Comptrollers of Goods and Services Tax and Property Tax, the Chief Assessor and the Commissioner of Stamp Duties despite secrecy obligations. Put the two jurisdictions' provisions side by side and the position is unglamorous but clear: nothing arrives in Taipei by itself, and a specific, foreseeably relevant request about a named person — living or dead — has a statutory path at both ends, from 13 February 2026, reaching taxable periods that began as long ago as 1982.

What Singapore changes for the family is real and narrow, and it is not invisibility. Singapore charges no estate duty on deaths on or after 15 February 2008, so there is no Singapore tax on the estate — and, as the site's page on the 2026 estate-tax exemption sets out, no foreign tax to credit against the Taiwanese bill either. A Singapore-law trust settled during the founder's lifetime changes what is in the estate at death; it does not change what Taiwan taxes, because article 5-1 of the Estate and Gift Tax Act treats a trust whose beneficiary is not the settlor as a gift by the settlor at the time the trust is made, taxable then. And the trustee, if resident in Singapore, is inside the CRS perimeter described above. What the structure genuinely delivers is a trustee who can act on the day the six-month return under article 23 falls due, a distribution rule that does not wait for a Taiwanese court, and a record the family can produce rather than reconstruct.

The close, against our own interest, because it is the sentence that decides most cases. For the overwhelming majority of Taiwanese families the risk is not that a bureau discovers a hidden account. It is that the family discloses it itself, correctly, six months after the funeral — and that the disclosure is the first document in which the account has ever appeared. An estate return showing a Singapore balance built over fifteen years, filed by an heir who has never seen an Income Basic Tax Act filing that mentions overseas income, is not evidence of evasion; it is a question the file now contains, and article 21 gives the answer a five-year or a seven-year horizon depending on how the earlier years are characterised. The work that removes this is not offshore and not clever. It is reading the last several years of the household's consolidated returns while everyone is alive, seeing whether the NT$1,000,000 floor in article 12 was ever crossed, and deciding — before the funeral decides — whether article 48-1 is a door the family wants to walk through on its own feet. That conversation is stewardship, and it is materially easier to have now than in month five.