Singapore is moving every GST-registered business onto structured, machine-readable e-invoices. The GST InvoiceNow Requirement is no longer a pilot — at Committee of Supply 2026 the Government confirmed it will extend to all GST-registered businesses by 1 April 2031. This is the working version of what we tell clients: what InvoiceNow is, the exact phase dates, who acts when, and how to get ready without disruption.

What is InvoiceNow? Singapore’s Peppol-based e-invoicing network explained

InvoiceNow is Singapore’s nationwide e-invoicing network, operated by the Infocomm Media Development Authority (IMDA) and based on the international Peppol framework. It lets businesses transmit structured e-invoices directly between finance systems — and, under the GST InvoiceNow Requirement, transmit invoice data to the Inland Revenue Authority of Singapore (IRAS).

An InvoiceNow e-invoice is not a PDF or a scanned image. It is structured data that flows from one accounting or ERP system into another over the Peppol network, with no manual re-keying. OpenPeppol independently describes InvoiceNow as “Singapore’s nationwide e-invoicing network based on the Peppol framework.” IMDA is Singapore’s designated Peppol Authority and accredits the InvoiceNow service providers and Access Points that connect businesses to the network.

The GST InvoiceNow Requirement: why IRAS is mandating e-invoicing

The GST InvoiceNow Requirement obliges GST-registered businesses to use InvoiceNow-Ready solutions to transmit invoice data to IRAS, on a phased basis through to 2031. The policy goal is straightforward: structured invoice data reduces manual entry errors, speeds up reconciliation between buyers and sellers, and gives IRAS cleaner data for GST administration.

This sits alongside, but is separate from, ordinary GST mechanics. The current GST rate is 9% (since 1 January 2024), and the compulsory-registration threshold remains S$1 million in taxable turnover. InvoiceNow does not change those numbers — it changes how registered businesses generate and report invoices. If you are unsure whether you must register for GST at all, start with our corporate secretarial and GST services; your InvoiceNow obligations follow from your registration status.

The full phased mandate timeline, 2025–2031

The GST InvoiceNow Requirement rolls out in stages from 2025 to 2031, with the extension to all GST-registered businesses announced at Committee of Supply 2026 and the final phase effective 1 April 2031. The table below sets out each milestone. Note the distinction between the announcement (Committee of Supply 2026) and the effective dates below.

The turnover bands for existing businesses are triple-corroborated against IRAS-domain sources, OpenPeppol and independent commentary, but businesses should re-confirm the exact band wording against the live Committee of Supply 2026 announcement and the latest IRAS FAQ before acting.

Who must act and when: voluntary, new and existing registrants

Your obligation date depends on how and when you became GST-registered. There are three broad groups.

New voluntary registrants

• Newly incorporated companies (incorporated within 6 months of submitting a voluntary GST-registration application) that apply on or after 1 November 2025 must adopt InvoiceNow from that date.
• All other new voluntary registrants applying from 1 April 2026 must comply, regardless of incorporation date or constitution.

This makes InvoiceNow a day-one consideration for founders. If you are setting up and plan to register voluntarily, factor it into your finance stack from the start — see incorporating a company in Singapore.

New compulsory registrants

Businesses that cross the S$1 million threshold and must register from 1 April 2028 onwards are required to comply from registration.

Existing GST-registered businesses

Businesses already GST-registered before 2026 are phased by turnover from 1 April 2028 to 1 April 2031 (see the timeline table). IRAS has indicated it will inform businesses registered before 2026 of their mandatory implementation date by mid-2026.

How the turnover bands work for existing GST-registered businesses

For existing businesses, your phase is determined by total annual supplies made in all prescribed accounting periods ending in calendar year 2025. “Total annual supplies” means the sum of your standard-rated, zero-rated and exempt supplies — not just your taxable turnover.

• ≤ S$200,000 → comply from 1 April 2028
• ≤ S$1,000,000 → comply from 1 April 2029
• ≤ S$4,000,000 → comply from 1 April 2030
• > S$4,000,000 → comply from 1 April 2031

Pull your 2025 GST returns now and add up total supplies for the year — that single figure tells you which band you fall into and therefore your deadline.

How to get ready: choosing a solution and connecting to IRAS

Getting InvoiceNow-ready means adopting an InvoiceNow-Ready Solution (or connecting via an IMDA-accredited Access Point on the Peppol network) and then activating the connection to transmit invoice data to IRAS. There are three practical steps.

1. Choose your channel. Either adopt an InvoiceNow-Ready accounting/ERP solution, or connect your existing system through an IMDA-accredited Access Point. IMDA accredits the solution providers and Access Points, so check that your provider is on its list.
2. Register your business on the network. Your Peppol identity (typically tied to your UEN) is registered so invoices can be addressed to and from you.
3. Activate the connection to IRAS. Switch on the feature that transmits invoice data to IRAS via the InvoiceNow network, and test that invoices flow correctly before your phase date.

Costs and support: transitional funding and free solutions for SMEs

The Government is offering transitional funding to offset onboarding costs — up to S$1,000 for SMEs and up to S$5,000 for larger businesses. In addition, SMEs can use InvoiceNow-Ready Solutions for free until March 2031, which significantly lowers the cost of compliance for smaller firms that act within the support window.

• SMEs: transitional funding of up to S$1,000, plus free InvoiceNow-Ready Solutions until March 2031.
• Larger businesses: transitional funding of up to S$5,000.

Because the free SME solution window closes in March 2031, the cost case favours early adoption rather than waiting until your phase date.

Benefits of adopting early (and the risks of waiting)

Adopting InvoiceNow early reduces manual data entry, cuts invoice disputes, speeds up payment cycles, and front-loads the work before your mandatory phase date arrives. Structured invoices flow straight into your counterparty’s system, so reconciliation is faster and errors fewer.

The risk of waiting is not a quoted fine — it is the compliance squeeze. The GST InvoiceNow Requirement is a firm obligation with a fixed lead time. Leaving onboarding to the last quarter before your phase date risks rushed system changes, missing the free-solution and funding windows, and disrupting your invoicing during a busy period. Treat your phase date as a hard deadline and work backwards.

Frequently asked questions about InvoiceNow and GST

Does InvoiceNow apply if I am not GST-registered?

The GST InvoiceNow Requirement applies to GST-registered businesses. If you are not registered, you may still adopt InvoiceNow voluntarily, but the mandate is triggered by GST registration.

Is InvoiceNow the same as Peppol?

InvoiceNow is Singapore’s implementation of the Peppol framework. Peppol is the international standard; InvoiceNow is the national network built on it and overseen by IMDA.

What period decides my turnover band?

For existing GST-registered businesses, the band is based on total annual supplies in all prescribed accounting periods ending in calendar year 2025.

Will GST itself change because of InvoiceNow?

No. The GST rate stays at 9% and the S$1 million compulsory-registration threshold is unchanged. InvoiceNow changes how invoices are generated and reported, not the tax.

How Asprin can help you become InvoiceNow-ready

Asprin is a registered corporate service provider that handles GST registration, InvoiceNow onboarding and ongoing compliance as one workstream. We confirm your phase date, check your accounting system is InvoiceNow-Ready (or connect you via an accredited Access Point), help you claim the available funding, and verify your connection to IRAS before your deadline.

For businesses still mapping out their GST obligations, pair this with our corporate secretarial and compliance services so your filings, returns and e-invoicing stay aligned year to year.

Sources and further reading

• IMDA — Nationwide E-Invoicing Framework (InvoiceNow)
• IRAS — Committee of Supply 2026: extension to all GST-registered businesses by April 2031
• IRAS — GST InvoiceNow Requirement
• IRAS — Prepare early: adopt the GST InvoiceNow Requirement from 1 May 2025
• IRAS — Do I need to register for GST?
• IRAS — Current GST rates
• OpenPeppol — Singapore extends GST InvoiceNow Requirement
• Asprin — Corporate secretarial and GST compliance services