Country deep dive
Taiwan's eGUI system built up in stages: cross-border VAT/eGUI obligations for foreign digital providers from 1 May 2017, the universal domestic mandate from 1 January 2021, formalized transmission deadlines and penalties via a 2024 Business Tax Act amendment, and MIG 4.0 becoming the sole valid XML format once the legacy transition period closed 31 December 2025.
Taiwan's Regulations Governing the Collection of VAT on Cross-Border Electronic Services Provided by Foreign Enterprises took effect on 1 May 2017, requiring foreign digital service providers that met a registration threshold to register for VAT and begin filing, with electronic Government Uniform Invoice (eGUI) issuance obligations for these registrants following over the next several years. This established the cross-border piece of what became a universal domestic mandate in 2021; it created no obligation yet for domestic businesses.
From 1 January 2021, all business-tax-registered entities in Taiwan -- domestic and foreign -- must issue electronic Government Uniform Invoices (eGUI) in structured format, covering both B2B and B2C transactions. This is the headline "universal mandate" date: it moved eGUI from a cross-border-only and gradually-adopted requirement to a blanket obligation across the entire tax-registered business population, administered by the Ministry of Finance's E-Invoice Platform (operated with the Fiscal Information Agency).
An amendment to the Value-Added and Non-Value-Added Business Tax Act, published 3 September 2024, formalized transmission deadlines for eGUIs already in force: B2B invoices must be transmitted to the MOF platform within 7 calendar days, and B2C invoices within 2 calendar days. It also strengthened penalties for late or missing transmission and for inaccurate invoice data, with fines ranging from TWD 1,500 to TWD 15,000 and escalating penalties for repeat violations. This is a procedural and enforcement change -- it does not alter who is covered by the 2021 universal mandate.
Message Implementation Guideline (MIG) version 4.0 was introduced as the new eGUI XML format standard from 1 January 2024, running in parallel with the older MIG 3.1/3.2 formats through a transition period. That transition period closed on 31 December 2025 -- from 1 January 2026, MIG 3.1/3.2 submissions are no longer accepted and MIG 4.0 is the only valid format for eGUI transmission. This is a technical format upgrade, not a change to who is covered by the mandate.
A compliant eGUI must be issued in the current Message Implementation Guideline (MIG) 4.0 XML format -- the older MIG 3.1/3.2 formats were retired on 31 December 2025 and are no longer accepted. Invoices are transmitted to the Ministry of Finance's E-Invoice Platform, operated together with the Fiscal Information Agency (FIA).
Confirm your invoicing or ERP system's eGUI output has completed the MIG 4.0 migration -- MIG 3.1/3.2 submissions have been rejected outright since 1 January 2026.
Foreign businesses without a Taiwan presence should confirm their local agent or certified invoicing partner is registered and filing on their behalf.
The transmission-timing requirement sits on top of the format requirement -- a correctly formatted eGUI transmitted late is still a compliance failure.
The mandate covers every business-tax-registered entity in Taiwan -- domestic and foreign, B2B and B2C -- since 1 January 2021. Foreign digital service providers selling into Taiwan have been separately in scope for cross-border VAT registration and eGUI issuance since 1 May 2017, once they cross a registration threshold. A September 2025 Peppol Authority adoption adds a voluntary cross-border exchange option on top of the existing domestic mandate; it does not change who is required to issue eGUIs.
The 2025 Peppol Authority adoption is explicitly voluntary -- it adds an international exchange option alongside the domestic mandate rather than replacing or expanding who must comply.
All six named Peppol network members are separately tracked jurisdictions in this compliance corner -- worth checking if you already trade e-invoices with any of them.
A Taiwan eGUI moves through this sequence -- note this is post-issuance reporting, not real-time clearance:
The invoice is already legally valid once it reaches the buyer -- the MOF is not asked to approve it first, unlike the clearance-model mandates covered elsewhere in this tracker (Colombia, Argentina, Jordan).
Getting ready means confirming your invoicing or ERP system's eGUI output already migrated to MIG 4.0 (mandatory since 1 January 2026), building the 7-day B2B / 2-day B2C transmission deadlines into your workflow, and -- for foreign digital service providers -- confirming your cross-border VAT registration status.
Domestic B2B and B2C entities have been covered since 1 January 2021; there is no small-business carve-out the way some other mandates have.
MIG 3.1/3.2 submissions have been rejected outright since 1 January 2026 -- if your invoicing or ERP system hasn't upgraded, transmissions will fail.
B2B eGUIs must reach the MOF platform within 7 days of issuance, B2C within 2 days -- treat these as hard deadlines with fines attached, not soft targets.
If you sell digital services into Taiwan above the registration threshold, confirm your VAT registration and eGUI issuance obligations are current -- this track has applied since 2017, separate from the 2021 domestic mandate.
Taiwan's September 2025 Peppol Authority adoption is voluntary today, but worth tracking if you already exchange e-invoices with Australia, Japan, Malaysia, New Zealand, Singapore, or the UK.
Taiwan backs its e-invoicing rules with fines under the amended Business Tax Act: TWD 1,500-15,000 for late or missing transmission, with escalating penalties for repeat violations, and separate exposure for inaccurate transmitted invoice data.
Other countries in the same region, ordered by their next dated milestone. Each links to a full briefing.