InvoiceNow Singapore: GST Compliance Guide (2025-2031)

Why is Singapore requiring businesses to change the way they issue invoices?

IRAS introduced GST InvoiceNow to improve the accuracy and timeliness of GST reporting by replacing manual invoice submission with the electronic transmission of structured invoice data. The phased rollout also aims to reduce manual processing and simplify GST administration for businesses and IRAS. The rollout began on 1 November 2025 for certain voluntary GST registrants and will expand in stages through 1 April 2031.

Before InvoiceNow, invoices were commonly exchanged as PDF files or email attachments. Businesses often had to enter the same invoice data into multiple accounting systems, which slowed invoice processing and GST reporting.

InvoiceNow replaces that process with the direct transmission of invoice data between connected systems. According to IRAS, businesses that submit invoice data through the network can benefit from faster GST audits and validation checks to reduce wrongful GST charges. In February 2026, IRAS said the network had grown to more than 63,000 businesses and is expected to bring about 90,000 more businesses onto InvoiceNow by April 2031.

Each business’s deadline depends on how and when it registered for GST. This guide sets out what InvoiceNow requires, when your business must comply, and the steps to take before that date arrives.

What is InvoiceNow in Singapore?

InvoiceNow is a nationwide e-invoicing network that enables companies to process invoices in a more efficient manner. It operates on the standard Peppol framework, which directly transmits e-invoices in a standard format from the supplier’s finance system to the finance system of the customer. It is a quick and secure way to send invoices directly from and receive them directly into software. For example, unlike a PDF invoice, the customer will need a key to access the details in the accounting system.

InvoiceNow Singapore is being rolled out by IMDA, which is responsible for developing the infocomm and media sectors in Singapore. Invoices are transmitted through IMDA-accredited Access Point Providers (APs) or InvoiceNow-Ready Solution Providers (IRSPs) that connect businesses to the invoice network.

By providing invoice data directly to IRAS through the InvoiceNow network, businesses also benefit from improved tax compliance.

• The Peppol Network: E-invoices are sent between accounting systems via Peppol’s network rather than PDF or email.
• Government Commitment: The Singapore government leads the way on e-invoicing as all government departments can receive e-invoices.
• Bills Auto-filled: E-invoicing reduces manual bill entry, errors, late payments, and costs.

What are the Key Components of the InvoiceNow Ecosystem?

The InvoiceNow ecosystem consists of several components that work together to support the exchange of invoices. Each component performs a defined function, and they provide the infrastructure that allows invoices to be exchanged efficiently. The table below outlines the key components of InvoiceNow:

What are the Benefits of InvoiceNow for Businesses?

In the evolving world of digital transformation, businesses are moving from traditional methods like manual invoicing. Manual invoicing can slow payment processing and increase administrative workload for businesses. InvoiceNow enables invoice data to be exchanged directly between connected systems, reducing the need for manual data entry. As invoices are widely used by businesses across Singapore, implementing InvoiceNow has the following benefits:

 

• Enhances Accuracy and Security

Invoices are submitted securely through the Peppol network with tamper-proof records that minimise the risk of data loss and unauthorised changes. The direct integration with various finance systems eliminates the manual effort of sending and entering invoices into financial platforms.

 

• Faster Processing Time

InvoiceNow leverages a single solution for all parties, which means data can be transmitted directly between systems, allowing customers to make payments faster. Businesses using InvoiceNow receive payments faster than those using traditional invoicing methods.

 

• Reduce Compliance Efforts

Digital invoices are easy to manage and support faster GST audits and refunds. Businesses in Singapore can expect streamlined compliance efforts with auto-alerts for wrongful GST charging. Fewer businesses are likely to be selected for GST audits, and for those that are selected, the process is expected to be faster.

 

• Enhanced Cash Flow Management

InvoiceNow in Singapore accelerates the invoice processing cycle, allowing for better cash flow management. Businesses can ensure timely payments and avoid liquidity issues. InvoiceNow provides a clear view of the financial status of companies.

When Will Your Business Need to Comply with InvoiceNow?

The IRAS announced that it will implement a phased adoption of InvoiceNow for GST-registered businesses. From 1st November 2025, businesses that apply for voluntary GST registration have been required to transmit invoice data to IRAS. The adoption of InvoiceNow for submission of invoice data to IRAS extends the four-corner e-delivery model to a fifth corner. The timeline is as follows:

• 1 November 2025: Companies that register for GST voluntarily within 6 months of the incorporation date.
• 1 April 2026: Businesses that apply for voluntary GST registration on or after 1 Apr 2026
• 1 April 2028: Businesses that apply for compulsory GST registration on or after 1 Apr 2028 and existing GST-registered businesses with total annual supplies ≤ S$200,000
• 1 April 2029: Existing GST-registered businesses with total annual supplies ≤ S$1,000,000
• 1 April 2030: Existing GST-registered businesses with total annual supplies ≤ S$4,000,000
• 1 April 2031: Existing GST-registered businesses with total annual supplies > S$4,000,000

For the purpose of these implementation phases, total annual supplies means the combined value of all standard-rated, zero-rated, and exempt supplies made during the prescribed accounting periods ending in the 2025 calendar year.

Who Must Comply with GST InvoiceNow?

Businesses that fall within the scope of the GST InvoiceNow mandate are required to submit invoice data to the Inland Revenue Authority of Singapore (IRAS) for specified transactions. The following outlines the transactions covered under the requirement.

• Standard-rated supplies, excluding supplies subject to the reverse charge regime.
• Zero-rated supplies
• Standard-rated purchases for which input tax is claimed or will be claimed, excluding reverse-charge purchases.
• Point-of-sale supplies and petty cash purchases, which may be aggregated before the invoice data is transmitted to IRAS.

 

Exemptions to Comply with InvoiceNow:

• Businesses registered under the Overseas Vendor Registration (OVR) regime as they operate outside Singapore’s GST jurisdiction
• Businesses registered for GST solely under the Reverse Charge regime
• Deemed supplies
• Reverse charge supplies and purchases
• Non-reportable purchases, including blocked input tax items

How Can Your Business Get Started with InvoiceNow in Singapore?

Businesses adopting InvoiceNow are required to complete a series of steps before they can exchange electronic invoices. The process covers registration within the network and the configuration of services required to support the secure transmission of invoice data.

 

• Check Existing Accounting System

Verify if existing software is listed on IMDA’s accredited InvoiceNow-Ready Solution Provider List (IRSP). Consider adopting an accredited free or paid solution with InvoiceNow capabilities. Many software providers in Singapore support the Peppol network, enabling businesses to adopt digital invoicing without replacing their existing financial systems.

 

• Choose an InvoiceNow-Ready Solution

If your current software is not compatible, select an InvoiceNow-ready solution from an approved provider. Engage an IMDA-accredited Access Point (AP) provider to establish secure connectivity to the InvoiceNow network.

 

• Register the Business and Obtain Peppol ID

Once an InvoiceNow-enabled provider has been selected, companies must complete the registration process to join the network. Work with your selected IRSP provider to register the business in the SG Peppol Directory and obtain a Peppol ID, which is essential for sending invoices. Registration allows organisations to exchange electronic invoices with other registered businesses through the Peppol framework.

 

• Activate the GST InvoiceNow Submission Feature

Enable the GST InvoiceNow Submission feature within the InvoiceNow-ready solution to allow eligible GST invoice data to be transmitted electronically through the prescribed digital framework.

 

• Test the Connection

Before invoices are exchanged through the network, verify that the system has been configured correctly. A test transaction should be completed to confirm that invoice data is sent accurately and received successfully by the intended recipient.

What are the Penalties and Consequences of Non-Compliance?

Before adopting GST InvoiceNow, businesses should understand the rules that determine who must comply and what obligations apply once the mandate takes effect. The guidelines also outline the consequences of failing to meet the prescribed requirements.

Conclusion

InvoiceNow is becoming an important part of Singapore’s digital business environment, making it essential for businesses to plan their transition carefully. Selecting the right solution and implementing it correctly can help avoid unnecessary delays and compliance concerns.

3E Accounting Singapore provides businesses with practical guidance at every stage of the process, from selecting a suitable InvoiceNow solution to implementation and ongoing support, helping organisations adopt the new requirements with clarity and confidence.

Frequently Asked Questions