Singapore · IRAS · InvoiceNow · GST 9 %

Run your Singapore company on the InvoiceNow standard — from ACRA incorporation to ASEAN expansion.

IRAS has made InvoiceNow the national e-invoicing backbone: every GST-registered business must exchange invoices over the Peppol network in UBL format. Layer in a 9 % GST regime, CPF as the statutory payroll framework, PayNow as the dominant payment rail, and ACRA as the company registry — and you need software that treats these rules as first principles, not afterthoughts. The 4b2b suite covers the entire company lifecycle for Singapore.

Explore the topic map
InvoiceNow adoption & GST compliance dashboard4B2B · LEDGER VIEW
18
Modules
3
Clusters
100 %
IRAS-aligned
B2GB2BGST 9 %PeppolExport 0%
InvoicingAccountingPayrollOther
InvoiceNow mandate rollout 2022–2026
Currency
SGD
GST
9 %
Trade bloc
ASEAN
Registry
ACRA / BizFile+
What makes Singapore different

Peppol-native infrastructure, 9 % GST, CPF payroll — handled from day one.

Singapore did not merely adopt Peppol — it built InvoiceNow around it, positioning IRAS as the de facto clearinghouse for digital business transactions. Every invoice, quarterly GST F5 return and payroll run operates inside this framework. The 4b2b suite treats IRAS and InvoiceNow as the primary source of truth, not a compliance bolt-on.

IRAS-INVOICENOWIRAS / InvoiceNow mandateIRAS endorses InvoiceNow as the national e-invoicing standard. GST-registered businesses — and progressively all businesses — must transmit invoices over the Peppol network in UBL 2.1 format. The Peppol AS4 protocol provides cryptographic delivery confirmation and a tamper-evident audit trail.
GST-9GST at 9 %Standard-rated supplies carry GST at 9 %. Exported goods and qualifying international services are zero-rated; residential property and most financial services are exempt. Quarterly GST F5 returns are filed through IRAS myTax Portal — input and output tax must reconcile exactly with the InvoiceNow transaction log.
SGD-PAYNOWSGD · PayNow · global hubPayNow — Singapore's Peppol-era instant-payment rail — lets businesses receive funds via UEN or mobile number within seconds. SGD is the functional currency for all local transactions, while multi-currency invoicing is standard for cross-border clients. Singapore's AAA sovereign rating and open capital account make SGD a trusted settlement currency across ASEAN.
ASEAN-ACRAACRA registry · ASEAN gatewayACRA maintains the authoritative company register via BizFile+, assigning every entity a UEN that anchors its identity across IRAS, CPF, MOM and InvoiceNow. As an ASEAN founding member and Peppol pioneer, Singapore-incorporated entities enjoy preferential market access — and UEN-based invoicing — across the bloc.
01 · COMPANY FORMATION

Company Formation & Registration

Incorporating in Singapore involves more than filing an ACRA form. From the day the UEN is issued, the company enters the InvoiceNow Peppol ecosystem, the GST regime and the CPF payroll framework. These six topics walk through each step — and how the 4b2b suite slots in at each one.

6 · Open
02 · OPERATIONS

Operations — GST 9 %, InvoiceNow, CPF Payroll, PayNow

The operational rhythm of a Singapore company: a 9 % GST regime with quarterly F5 returns, InvoiceNow Peppol transmission required for every taxable invoice, CPF contributions due monthly for every locally employed staff member, and PayNow as the dominant payment rail. These six topics cover each obligation in detail.

6 · Open
03 · CROSS-BORDER

Cross-border — ASEAN, Exports & Regional HQ

Singapore sits at the intersection of the global Peppol network and the ASEAN economic bloc — a founding ASEAN member with over 100 double taxation agreements, a zero-rated GST regime for exports, and an internationally recognised legal system for holding regional IP and treasury functions. These six topics address each cross-border dimension in detail.

6 · Open

How the 4b2b modules fit together for a Singapore company

Each product is subscribed and managed on its own brand domain — billing, support and licensing all live there. This view shows how the modules interconnect for a Singapore-registered business operating under InvoiceNow, GST 9 % and CPF.

Open standards at the core

Every component of the ecosystem is built on published, auditable standards — InvoiceNow Peppol formats for e-invoicing, ISO 20022 for payment messaging, PDPA-aligned data handling and direct REST integrations with IRAS, ACRA and PayNow. No proprietary lock-in.

e-Invoicing & formats
InvoiceNow (Peppol)Peppol BIS 3.0UBL 2.1CIIISO 20022
Security & compliance
TLS 1.3OAuth 2.0Digital signaturesISO 27001Singapore PDPA
API integrations
REST APIWebhooksIRAS myTax PortalACRA BizFile+PayNow
Infrastructure
Singapore data centresPostgreSQLS3-compatible backupCDN99.9 % SLA

Built for accounting firms, corporate secretaries and law practices

Accounting firms and professional advisers in Singapore manage portfolios of clients through ACRA, IRAS, InvoiceNow, CPF Board and MOM. Every workflow in the ecosystem is designed around multi-mandate access — one practice, dozens of client entities, all under the same InvoiceNow and GST obligations.

Accounting firms

Manage multiple client mandates — GST F5 filings, CPF contribution schedules and InvoiceNow Peppol transmissions — from a single multi-tenant dashboard without switching between systems.

Law firms

Issue fee invoices with correct GST treatment, track matter timelines and maintain ACRA-ready compliance documentation, all linked to the practice's CorpPass profile.

Corporate secretaries

Anchor every client on their ACRA-assigned UEN, keep CorpPass authorisations current and manage the document workflows that support ACRA filings and government submissions.

IT agencies

Invoice international clients for cross-border digital services with automatic zero-rating, InvoiceNow-compatible Peppol delivery and multi-currency SGD conversion.

Partner programme — Singapore

Accountants, corporate secretaries and IT consultants who refer the ecosystem earn a recurring commission for every active client mandate — not a one-off referral fee. The more modules a client uses, the higher the combined commission.

Accounting firms
20–40 %

Recurring commission on every client mandate you refer and retain — GST F5, payroll, InvoiceNow and bookkeeping all count.

Corporate secretaries
10–25 %

Earned on referrals arising from ACRA incorporation, UEN setup and CorpPass compliance work you carry out for clients.

IT partners
25–50 %

Tiered upward when you integrate multiple modules — invoicing, ERP, HR and notifications — for a single client project.

Become a partner

Technologies we use

Python
Python
Go
Django
Django
Next.js
React
React
Vue
JavaScript
TypeScript
PostgreSQL
MongoDB
Qdrant
ChromaDB
Pinecone
Redis
Electron
Docker
Bootstrap
Bootstrap
Claude
OpenAI
Gemini