On 10 August 2026 the Taipei National Tax Bureau NTB released urgent guidance concerning the reporting obligations of individuals who have underreported personal comprehensive income tax. The advisory emphasizes that any instance of omitted or underestimated taxable income must be promptly refiled through the formal tax return amendment process and the outstanding tax liability must be remitted to the NTB without delay to avoid the accrual of interest and the imposition of late-filing penalties. The guidance references Article 47 of the Income Tax Act which mandates that taxpayers correct erroneous or incomplete returns within a specified amendment window typically the later of the original filing deadline or within three years of the assessment date though the NTB encourages immediate regularization to minimize financial penalties. The notice further specifies that the amendment window for the 114 tax year 2025 calendar year remains open until 31 July 2026 and individuals who fail to refile by this date may face not only the additional tax plus interest but also a penalty of up to 10 percent of the underreported amount depending on the severity and nature of the omission. The NTB has activated its online e-tax filing portal to streamline the refiling process providing step-by-step tutorials and a dedicated helpline to assist taxpayers in calculating the correct tax due. Additionally the guidance highlights that voluntary disclosure before the commencement of a tax audit may qualify for penalty abatement in line with the NTB’s compliance incentive framework. The bureau urges all taxpayers who become aware of any underreporting whether due to oversight erroneous advice or incomplete documentation to treat the matter with urgency as the cost of voluntary regularization is typically far lower than the cumulative financial burden of uncovered liabilities interest and penalties once a review is initiated.
Key Takeaways
- Mandatory Refiling and Payment: Taxpayers who have underreported personal income tax are required to immediately file an amended return and remit the full outstanding tax amount to halt the accrual of daily interest and to prevent the automatic application of late-filing penalties under the Income Tax Act.
- Amendment Window and Penalty Exposure: The official amendment period for the relevant tax year such as 114/2025 closes on 31 July 2026; filings submitted after this deadline expose the taxpayer to the full tax plus interest and a potential penalty of up to 10 percent of the underreported tax depending on the circumstances of the omission.
- Voluntary Disclosure Benefits: Filing an amended return through the NTB’s e-tax portal before the start of a tax audit may qualify the taxpayer for partial or full penalty abatement and the bureau’s online tools and helpline are designed to simplify the calculation and submission process reducing the administrative burden of regularization.
Disclaimer:This article is compiled and summarized based on publicly available information and is for general information and academic exchange purposes only. It does not constitute any form of formal tax advice, legal opinion, or basis for performance. For tax planning, please consult a qualified professional tax advisor or legal counsel.
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