GST + InvoiceNow: What Changes in Your Billing Flow (Singapore Guide)

Short version based on IRAS: GST‑registered businesses must transmit invoice data to IRAS using InvoiceNow‑Ready Solutions via the InvoiceNow (Peppol) network. Roll‑out is phased.

Key dates

• Soft launch: from 1 May 2025 (early adoption encouraged).

• Mandatory: from 1 Nov 2025 for newly incorporated companies that voluntarily register for GST.

• Mandatory: from 1 Apr 2026 for all new voluntary GST registrants.

• Others (e.g., existing GST‑registered businesses): timelines will be announced later by IRAS.

What changes in your billing

• You send structured e‑invoices through an InvoiceNow‑Ready Solution; data is routed to IRAS via Access Points (API).

• When the transmit‑to‑IRAS feature is activated, IRAS receives a copy whenever you issue/receive invoices over InvoiceNow (and when you record other invoices into your solution).

• Invoices not issued via InvoiceNow (e.g., POS sales) should still be recorded in your InvoiceNow‑Ready Solution and sent to IRAS.

What stays the same

• You still issue valid tax invoices/credit notes, keep GST records, and file GST F5 as usual.

  
  

Quick prep (1‑minute checklist)

• Confirm your software is InvoiceNow‑Ready and enable transmit to IRAS.

• Ensure UEN/Peppol IDs are captured for trading partners.

  
  

Need help turning on InvoiceNow?

We’ll check readiness, enable transmit‑to‑IRAS, and run a quick pilot.

📩 Message Apscom Solutions to get InvoiceNow‑ready—fast.