E-Invoicing in Singapore [2025 Requirements]

Singapore is on the Road to e‑Invoicing

Singapore was one of the pioneers in the field of e-invoicing in the ASEAN region and introduced the obligation to use electronic document exchange in 2018. Since then, it has been a rule in B2G relations that government authorities exchange e-invoices with private companies via the Peppol network.

The Infocomm Media Development Authority (IMDA), established in 2019 and the first accredited Peppol Authority operating outside Europe, intends to digitize and promote electronic invoicing in Singapore. To reduce errors and processing time for invoices and payments, IMDA has created a nationwide e-invoicing network, InvoiceNow, and promotes the adoption of electronic invoicing in the private sector.

E-invoicing process description

Who is obliged to use e‑invoicing in Singapore?

At this moment, e-invoicing for B2B and B2G is not broadly mandatory in Singapore. However, it is strongly recommended by IMDA for both uses. Invoices issued via InvoiceNow are valid documents for tax purposes.

Singapore’s Inland Revenue Authority (IRAS) has announced plans to enable wider use of the country's new InvoiceNow system, beginning with a voluntary soft launch for early adoption for some of the GST-registered entities that commenced on May 1, 2025. Ultimately, all GST-registered companies will be required to submit invoice data to IRAS using InvoiceNow solutions via the InvoiceNow network.

In Singapore, the Goods and Services Tax (GST) is a broad-based consumption tax akin to VAT (and distinct from standard Sales Tax), as it is charged only once at the end of the value-adding chain. The GST register serves as the official registry of GST payers. Whether a company needs to register as a GST-payer depends primarily on its taxable turnover:

Compulsory Registration: Required if the company's taxable turnover exceeds S$1 million – either achieved at the end of any calendar year (in which case, the business must apply within 30 days of the end of that year) or expected in the next 12 months.
Voluntary Registration: Companies under the S$1 million threshold can still choose to register. This is common for B2B companies wanting to claim back the GST paid to suppliers. Once registered voluntarily, a company must remain in the GST system for at least two years. Directors or sole proprietors must complete an IRAS e-learning course and pass a quiz before applying.

Implementation timeline

The B2B e-invoicing requirement is being implemented gradually:

November 1, 2025: Newly incorporated companies that voluntarily registered for GST must transmit invoice data to IRAS using InvoiceNow solutions via the InvoiceNow network (i.e., companies set up after this date that opt to register as a GST-payer from the start of their operations).
April 1, 2026: All new voluntary GST registrants are required to transmit invoice data to IRAS, regardless of incorporation date or business structure.
April 1, 2028: Mandatory for all new compulsory GST registrants and existing businesses with annual taxable supplies ≤ SGD 200,000 (approx. EUR 138,000).
April 1, 2029: Mandatory for existing GST-registered businesses with total annual taxable supplies up to SGD 1 million (approx. EUR 690,000).
April 1, 2030: Mandatory for existing GST-registered businesses with total annual taxable supplies up to SGD 4 million (approx. EUR 2.76 million).
April 1, 2031: Mandatory for all remaining GST-registered businesses with total annual taxable supplies exceeding SGD 4 million.

What is the required format of an e-invoice?

Singaporean IMDA authority maintains a nationwide network under the name InvoiceNow. E-invoices are exchanged based on the PEPPOL interoperability framework. The accepted format is Peppol BIS Billing 3.0

In addition to serving domestic purposes, the network allows transacting with entities participating in the broader Peppol Network. Furthermore, it is designed to complement existing EDI through straightforward integration.

How may integrity and authenticity be ensured?

Integrity and authenticity must be ensured. An Advanced Electronic Signature can be used to meet these requirements.

Singapore-based entities with a valid UEN (Unique Entity Number) must also obtain CorpPass KYC certification before using InvoiceNow. This requirement does not apply to foreign entities with or without a UEN.

Archiving requirements for e‑invoicing in Singapore

Required storage period is 5 years.

Acts / Government sites

How can we help?

Comarch is currently participating in the certification process to become the authorized Peppol Service Provider in Singapore.

1. Legal compliance
Full compliance with the latest data exchange regulations and modern data transfer standards
2. Digitization
Applying new technologies and IT solutions in order to streamline workflows and automate activities and procedures
3. Individual approach
Tailor-made solutions based on processes specific to each company – own road map and a suitable pace of changes
4.Security
Highest level of security for all sensitive and important company data

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