What InvoiceNow actually is
InvoiceNow is the Singapore implementation of the global PEPPOL e-invoicing network, managed by IMDA. Instead of emailing PDFs, suppliers and buyers exchange structured XML invoices directly between their accounting or ERP systems. The structured data flows through registered access points; everyone in the network speaks the same standard format (PEPPOL BIS Billing 3.0).
For IRAS, the structured data is the point. Tax-relevant fields arrive in clean, predictable shapes, which lets IRAS automate GST reporting validation that used to require submissions. For businesses, the practical benefit is faster invoice processing and fewer human-error reconciliations.
Where the mandate stands
IRAS has been phasing InvoiceNow into mandatory GST reporting in waves. Voluntary GST registrants from May 2025; newly incorporated, GST-registering companies from 1 November 2025; broader scope rolling out into 2026. Dates have shifted before and may shift again — the authoritative source is IRAS plus the IMDA InvoiceNow page.
The point for a Singapore SMB manufacturer is not whether the date for your specific GST category is firm. The point is that the direction is one-way: structured PEPPOL invoicing is becoming the default. Bake it in now and the upcoming wave is a non-event. Ignore it and you will be retrofitting under deadline pressure in 12 to 24 months.
The practical checklist
1. Confirm your access point
A PEPPOL access point is the gateway that sends and receives invoices on your behalf. Many local providers are certified — Xero, QuickBooks, SAP, and several Singapore-specific vendors. Confirm which access point your finance system uses or recommends, and whether it covers both send and receive.
2. Register your UEN as a PEPPOL party
Your UEN becomes the routing identifier on the PEPPOL network. This is usually handled by your access point during onboarding. Confirm it is done before you start sending real invoices.
3. Map your invoice fields to the PEPPOL spec
PEPPOL BIS Billing 3.0 has specific requirements for invoice line items, tax categories (with Singapore-specific GST categories), party identifiers, and document references. If your invoice template includes non-standard fields, you need to decide whether to drop them, map them, or keep them as parallel free-text.
4. Test sending to yourself
Most access points offer a test send-and-receive loop. Run a real-shaped invoice end-to-end before you go live. Check that GST categories arrive correctly, line totals reconcile, and reference fields (PO number, delivery order number) survive the transit.
5. Confirm your customers are reachable
If your customers are not on PEPPOL yet, you cannot send them an InvoiceNow invoice — only PDFs as before. Most large Singapore buyers are already onboard; SMB customers may not be. Track which of your customers can receive InvoiceNow, and which still need PDF flows.
How this affects a new ERP build
For a fresh Start Canyon build, PEPPOL readiness is baked in at design time. Invoice generation produces both PDF for legacy customers and PEPPOL XML for the network. Tax categories live as a structured enum rather than a free-text field. Party identifiers are first-class on customer records.
What we hand off to your finance system
Start Canyon does not replace your finance system. We integrate. The pricing engine and order pipeline produce a structured invoice payload that your finance system (Xero, Million, Globe3, Sage, SAP B1) consumes and transmits via its PEPPOL access point. You get the operational benefits of a workflow-shaped system without giving up the accounting tooling you already trust.
If your current finance system does not support PEPPOL natively, the discovery session is the moment to decide between switching access points, switching finance systems, or adding a middleware layer. None of these are dramatic — but they should be a conscious choice, not something the build defers.
When to start
If you are GST-registered and not yet on InvoiceNow, the answer is now. If you are planning an ERP or workflow build in the next 12 months, build it PEPPOL-ready from day one. The cost of starting early is small; the cost of being late is operational disruption during a period when you are also trying to grow.