Singapore InvoiceNow E-Invoicing: What GST Businesses Need
IRAS is phasing in a GST InvoiceNow requirement on Singapore's Peppol network from November 2025 through 2031. Here's the timeline, the free IMDA-accredited options, and which software fits.
Singapore's e-invoicing runs on **InvoiceNow**, the national network built on the Peppol standard, and IRAS is phasing in a **GST InvoiceNow** requirement that transmits invoice data to IRAS. It starts with newly incorporated companies on voluntary GST registration (**1 Nov 2025**), extends to all new voluntary GST registrants (**1 Apr 2026**), then progressively to existing GST-registered businesses by size through to **April 2031**. To comply you need an **InvoiceNow-Ready solution** from IMDA's accredited list — many are **free for SMEs until March 2031** — and there is government funding of up to **SGD1,000 for SMEs and SGD5,000 for larger firms**. The practical step is to pick accounting or corporate-services software that is on IMDA's InvoiceNow-Ready list; confirm accreditation before you commit.
| Option | Type | How it handles InvoiceNow | Best for |
|---|---|---|---|
| Free InvoiceNow-Ready package | IMDA-accredited (free tier) | Peppol Access Point plus basic invoicing; free for SMEs until Mar 2031 | SMEs wanting zero- or low-cost compliance |
| Deskera | Business suite | All-in-one books and invoicing; verify it is InvoiceNow-Ready on IMDA's list | SMEs wanting a single suite |
| HashMicro | ERP | ERP with e-invoicing; suited to higher volume | Larger firms needing ERP integration |
| Osome | Accounting / corporate services | Outsourced bookkeeping and filing; confirm InvoiceNow handling | Founders who prefer a done-for-you service |
| Sleek | Corporate services / compliance | Incorporation plus accounting; confirm InvoiceNow-Ready status | New companies bundling compliance |
| Peppol Access Point / SP | Integration route | Connects your ERP to the InvoiceNow (Peppol) network for IRAS | Custom ERP or high volume |
SEA Operational Reasoning
Two things make Singapore different from its neighbours. First, the requirement is tied to GST registration and rolls out gradually — newly incorporated voluntary registrants from November 2025, all new voluntary registrants from April 2026, then existing GST-registered businesses in size bands through to April 2031 — so the honest first question is which cohort you fall into, not which software to buy. Second, cost is largely solved for small businesses: IMDA offers InvoiceNow-Ready solution packages free to SMEs until March 2031, plus grant funding, so many firms can comply without a new software bill. That reframes the decision toward what you already run: if you use an accounting or ERP suite, the task is confirming it is on IMDA's accredited InvoiceNow-Ready list; if you outsource finance, a corporate-services provider can handle it. Among tools in our directory, Deskera and HashMicro cover the suite/ERP path while Osome and Sleek cover the done-for-you path — in every case, verify the specific solution's InvoiceNow-Ready accreditation with IMDA before relying on it, because that list, not a vendor's marketing, is what determines compliance.
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The questions operators actually ask.
When does my business have to use InvoiceNow?
It is phased by GST-registration cohort: newly incorporated companies on voluntary GST registration from 1 November 2025; all new voluntary GST registrants from 1 April 2026; then existing GST-registered businesses progressively from 2028 (smaller supplies first) through to April 2031. IRAS publishes the definitive schedule; confirm your cohort there.
How much does InvoiceNow compliance cost?
For many businesses, little or nothing. IMDA offers InvoiceNow-Ready solution packages free to GST-registered SMEs until March 2031, and there is government funding of up to SGD1,000 for SMEs and SGD5,000 for larger firms. The main cost is usually setup and process change rather than software licensing.
What is InvoiceNow, technically?
InvoiceNow is Singapore's nationwide e-invoicing network built on the international Peppol standard, using the PINT-SG format. GST InvoiceNow goes a step further than ordinary Peppol exchange by transmitting tax-relevant invoice data to IRAS for GST reporting, which is why you need an InvoiceNow-Ready solution rather than any generic e-invoice tool.