Compliance Guide

InvoiceNow and GST — what Singapore SMEs need to know

E-invoicing is arriving for Singapore businesses. Here is how InvoiceNow works, how GST interacts with it, and what your business should be preparing for.

What is InvoiceNow?

InvoiceNow is Singapore's nationwide e-invoicing framework, developed under IMDA (Infocomm Media Development Authority) and Enterprise Singapore. It is built on the international Peppol standard — the same infrastructure used for e-invoicing in the European Union, Australia, and New Zealand.

Instead of emailing PDF invoices or posting paper, businesses on InvoiceNow exchange structured digital invoices directly between their accounting systems through the Peppol network. The data arrives in a machine-readable format, which means the receiving system can process it automatically — no manual data entry.

How Peppol works in practice

Each business registers a Peppol ID (typically their UEN). When you issue an invoice, your accounting software sends the structured invoice data through a Peppol Access Point to the recipient's Access Point, which delivers it to their system. Think of it as email for invoices — direct, digital, and standardised.

Who needs to use InvoiceNow?

Singapore is rolling out InvoiceNow adoption progressively. The government has mandated that GST-registered businesses adopt InvoiceNow for transmitting invoices to IRAS, with larger businesses moving first and smaller businesses following. The timeline is being phased in over several years.

Even if your business is not yet mandated, voluntary adoption is encouraged. Government agencies already transact on InvoiceNow, and businesses that supply to the government sector are adopting early to stay eligible.

Progressive mandate

The mandate is being phased in based on business size and GST registration status. Check IRAS and IMDA announcements for the latest timeline that applies to your business.

GST in Singapore — the essentials

The Goods and Services Tax (GST) is Singapore's broad-based consumption tax, currently set at 9% (effective 1 January 2024). It applies to most goods and services supplied in Singapore and to imports.

GST rate

9%

From 1 January 2024. Previously 8% (2023) and 7% (before 2023).

Registration threshold

S$1M

Businesses must register for GST if taxable turnover exceeds S$1,000,000 in a 12-month period (or is expected to).

GST-registered businesses must charge GST on their supplies, claim input tax on business purchases, and file GST returns (typically quarterly) with IRAS. Accurate record-keeping is essential — every transaction needs to be correctly classified as standard-rated, zero-rated, or exempt.

How InvoiceNow simplifies GST reporting

When invoices are exchanged in a structured digital format, the GST amounts, tax codes, and line-item details are already machine-readable. This means:

  • •Fewer data entry errors — invoice data flows into your books without re-keying, so GST amounts match between buyer and seller.
  • •Faster reconciliation — your accounting system can automatically match received invoices against purchase orders and payment records.
  • •Audit-ready records — structured invoices with timestamps and Peppol transaction IDs create a clear trail for IRAS audits.
  • •Simpler GST returns — with structured data in the ledger, your quarterly GST return can be compiled from the books with less manual checking.

How Critical Mass Cloud handles InvoiceNow and GST

The Accounting module in Critical Mass Cloud is built with Singapore's GST framework and InvoiceNow support from the ground up:

InvoiceNow integration

Send and receive Peppol e-invoices directly from the accounting module. No separate portal or manual upload.

GST-aware transactions

Every invoice, bill, and journal entry carries the correct GST treatment — standard-rated, zero-rated, or exempt.

GST reporting

Compile your GST F5/F7 return data from the ledger. The numbers tie back to the source transactions.

Connected to payroll

Payroll journals post directly to the ledger, so salary expenses are already in the books when you prepare your returns.

See InvoiceNow and GST in action

Walk through e-invoicing, GST-aware transactions, and how the accounting module connects to the rest of your back office.

See the Accounting module

Related reading

Sources

Information in this guide is sourced from IRAS (iras.gov.sg), IMDA (imda.gov.sg), and Enterprise Singapore (enterprisesg.gov.sg). Verify current regulations before making compliance decisions. This guide is for general information only and does not constitute legal or financial advice.