Singapore GST InvoiceNow Requirements: Latest 2026 Updates

As Singapore continues to lead the way in digital innovation, the government has introduced InvoiceNow to simplify invoicing processes for GST-registered businesses. This initiative, supported by the Infocomm Media Development Authority (IMDA), ensures that businesses can meet GST invoicing requirements while enjoying the benefits of automation and efficiency.

Built on the internationally recognised PEPPOL network, InvoiceNow allows businesses to exchange e-invoices seamlessly, ensuring compliance with GST requirements while reducing administrative burdens. In this blog, we take a closer look at the new requirements and find out more about how you can go about meeting them!

Key Takeaways

• InvoiceNow is Singapore’s nationwide e-invoicing initiative based on the internationally recognised PEPPOL network. It enables businesses to send and receive invoices digitally, promoting efficiency and compliance.
• GST-registered businesses are required to use InvoiceNow-Ready Solutions to transmit invoice data to IRAS. This applies to invoices issued via InvoiceNow and those recorded in InvoiceNow-Ready Solutions.
• Early adoption began in May 2025, with mandatory requirements for new voluntary GST registrants starting from November 2025. Full implementation for all GST-registered businesses is expected in subsequent phases.
• Businesses can access the Productivity Solutions Grant (PSG) for funding up to S$30,000 and Free-of-Charge (FOC) solution packages to ease the transition to InvoiceNow.
• Businesses should check for IMDA-accredited solutions, register with the SG Peppol Directory, and enable the GST InvoiceNow submission feature to ensure compliance.
Adopting InvoiceNow-Ready Solutions ensures compliance and positions businesses for greater efficiency, accuracy, and growth in Singapore’s digital economy.

What is InvoiceNow?

InvoiceNow is Singapore’s nationwide e-invoicing initiative that enables businesses to send and receive invoices digitally through a secure network. It is based on the PEPPOL (Pan-European Public Procurement On-Line) network, an international standard for e-invoicing. InvoiceNow is part of the Singapore Government’s efforts to promote digital transformation and streamline business processes.

InvoiceNow for GST Timeline

In a move to support this initiative, GST-registered businesses are required to use InvoiceNow-Ready Solutions to send invoice data to the Inland Revenue Authority of SIngapore (IRAS) for tax administrative reasons. Even if invoices are not issued via InvoiceNow, such as sales made using point-of-sale (POS) systems, they should still be recorded in InvoiceNow-Ready Solutions and sent to IRAS.

This conforms with global trends, where governments across the globe are actively pushing for the implementation of e-invoicing for tax administration. The phased adoption comes after IMDA, IRAS, service providers and businesses conducted a pilot between September 2020 and June 2023.

Implementation Stages of GST InvoiceNow Requirement

Businesses will be given enough time to prepare for the requirements thanks to the implementation in a progressive manner. A soft launch for early adoption has taken place since 1 May 2025.

Aside from mandating it for voluntary GST registrants, the Singapore government has also released details for a separate timeline from 1 Apr 2028 to 1 Apr 2031, applicable to all new voluntary GST registrants, regardless of business structure or incorporation date.

How Do InvoiceNow-Ready Solutions Work?

InvoiceNow-Ready Solutions are accounting and finance tools designed to facilitate seamless invoice transmission between businesses through the InvoiceNow network. These solutions can be purchased as off-the-shelf software or customised as proprietary enterprise resource planning (ERP) systems tailored to specific business needs.

These solutions connect to IRAS via Access Points (AP), enabling the transfer of invoice data using Application Programming Interface (API) technology. Once businesses activate the feature to transmit invoice data to IRAS, a copy of the invoice data is automatically sent to IRAS whenever invoices are issued or received through the InvoiceNow network, or when other invoices are recorded in the InvoiceNow-Ready Solutions.

Financial Support for Ease of Adoption

The government, through IRAS and IMDA, is dedicated to supporting businesses in meeting regulatory requirements and adopting digital solutions with ease.

What Are the Benefits of InvoiceNow-Ready Solutions?

Adopting InvoiceNow-ready solutions can transform the way businesses handle invoicing, offering a range of advantages that go beyond just compliance.

Efficiency

Suppliers can issue invoices directly from their billing systems, speeding up the invoicing process. For buyers, invoice data is seamlessly integrated into their accounting systems, eliminating the need for manual data entry and minimising errors.

Reliability

Invoices are transmitted securely through the InvoiceNow network, leveraging the internationally recognised Peppol standard for safe and dependable delivery.

Streamlined Invoicing Process

A single solution of your choice for invoicing across different parties, whether businesses or the government, and tax compliance.

Reduced Compliance Efforts

GST-registered businesses using InvoiceNow-Ready Solutions to transmit invoice data to IRAS can significantly reduce the effort required for compliance when preparing data for submission.

With IRAS’ advanced risk detection capabilities, fewer businesses are likely to be selected for GST audits. For those that are audited, the process is expected to be quicker, with faster resolution of any issues. Additionally, businesses claiming GST refunds may benefit from earlier disbursements.

Moreover, InvoiceNow-Ready Solutions offer value-added features that simplify tax compliance. These include built-in checks to identify invoices from suppliers who may have incorrectly charged GST, helping businesses avoid errors in input tax claims and ensuring greater accuracy in their submissions.

Global Operational Integration

Using InvoiceNow positions your business for international expansion. Because the system is built on global standards, you will be better equipped to integrate your operations with other jurisdictions using similar e-invoicing frameworks, such as the EU, Australia, New Zealand, and Japan.

What Does the GST InvoiceNow-Ready Requirement Cover?

Deadline to Transmit Invoice Data to IRAS

The invoice data must be transmitted to IRAS based on these dates, whichever is earlier:

• The date of which the relevant GST return is filed
• The filing deadline of the relevant GST return

The relevant GST return refers to the return that covers the accounting period where the transaction date takes place.

The transaction date is determined based on

Supplies Data

• In the case of a supply where an invoice is or will be issued, the transaction date will be the document’s issuance date
• For other supplies, the date of transaction will be the date that the transaction is posted into the accounting system

Purchase Data

• For a purchase where the supplier’s invoice or an equivalent document is or will be issued, the transaction date will be either the document’s issuance date or date that the transaction is posted into the accounting system
• For other purchases, the transaction date will be the date that the transaction is posted into the accounting system

Businesses Excluded From GST InvoiceNow Requirement

These groups of businesses are exempt from the GST InvoiceNow Requirement:

1. Overseas entities registered under the Overseas Vendor Registration (OVR) Pay-only regime and OVR full regime
2. Businesses that need to register for GST only because of the Reverse Charge regime

Implementing InvoiceNow-Ready Solutions for the GST InvoiceNow Requirement

Businesses can prepare to adopt InvoiceNow-Ready Solutions with these steps:

1. Businesses with existing accounting or finance solutions, or those intending to buy one, should check whether their preferred solution is IMDA’s accredited InvoiceNow-Ready Solution Providers (IRSP) list
2. Large corporations with their own in-house solutions should get in touch with an IMDA-accredited Access Point Provider (AP) to get connected to the InvoiceNow network
3. Businesses should approach their IRSP and/or AP to register their business in the SG Peppol Directory with their UEN and obtain their Peppol ID
4. Enable the GST InvoiceNow submission feature and test their system

Understand the New Requirements With Ease

Embracing InvoiceNow and leveraging InvoiceNow-Ready Solutions is an opportunity to streamline operations, reduce costs, and future-proof your business in Singapore’s digital economy. With the support of IRAS, IMDA, and various grants and incentives, businesses can transition seamlessly to this innovative e-invoicing system.

By adopting these solutions, you can simplify your invoicing processes and position your business for greater efficiency, accuracy, and growth in an increasingly competitive landscape. At InCorp, our tax experts are here to help you navigate these upcoming changes at every step of the way. Talk to our team for more valuable insights and assistance wherever you need it. Contact us today!

About the Author

Mabel Ng

With over two decades of experience in direct and indirect taxation, Mabel has honed her expertise across a broad spectrum of environments, including the Big 4 accounting firms, mid-tier firms, and various industry roles. Her extensive background spans not only Singapore but also the wider Asia-Pacific region, reflecting a deep understanding of diverse tax landscapes and practices. She is also a member of the ISCA and FCCA, and is an SCTP Accredited Tax Practitioner.

More on Business Blogs