GST-registered businesses in Singapore will progressively be required to transmit invoice data to IRAS through InvoiceNow-ready accounting or finance solutions.
The obligation will be phased in from 1 November 2025 to 1 April 2031, depending on the business’s GST registration status and annual supply levels.
Key development
IRAS is introducing a staged requirement for GST-registered businesses to submit invoice information using software connected to the InvoiceNow network. Once activated, the relevant solution will transmit a copy of invoice data to IRAS.
The implementation timeline is as follows:
| Effective date | Businesses affected |
|---|---|
| 1 November 2025 | Companies that voluntarily register for GST within six months of incorporation |
| 1 April 2026 | All new voluntary GST registrants, regardless of entity type or incorporation date |
| 1 April 2028 | New compulsory GST registrants and existing GST-registered businesses with annual supplies of S$200,000 or less |
| 1 April 2029 | GST-registered businesses with annual supplies of up to S$1 million |
| 1 April 2030 | GST-registered businesses with annual supplies of up to S$4 million |
| 1 April 2031 | Remaining GST-registered businesses with annual supplies above S$4 million |
IRAS is expected to notify businesses registered before 2026 of their implementation dates by mid-2026. Businesses may use IRAS’s Excel-based calculator in the interim to estimate their likely compliance date.
Certain businesses are outside the scope of the requirement, including overseas entities registered under the Overseas Vendor Registration regime and businesses registered for GST only because of the Reverse Charge rules.
Financial reporting, tax and compliance impacts
GST compliance processes will become more system-driven.
Businesses will need to ensure that invoice data captured in their accounting systems is complete, accurate and properly structured before transmission to IRAS. Errors in master data, tax codes or invoice fields may become more visible and harder to correct retrospectively.
Tax reporting may become more closely aligned with transaction-level data.
The requirement may reduce reliance on manual GST return preparation processes over time, but it also increases the importance of reconciling invoice-level data with GST returns, general ledger balances and revenue records.
Audit trails and documentation will need to improve.
Businesses should expect greater scrutiny over how invoice data is generated, approved, amended and submitted. Auditors may place more emphasis on system controls, data integrity and reconciliation between InvoiceNow transmissions and statutory records.
Smaller GST-registered businesses will need to prepare early.
Although the later phases extend to 2028 and beyond, businesses with lower annual supplies may need time to select suitable software, migrate data and train staff.
Business operations may be affected by software readiness.
Accounting, billing and finance teams may need to review whether existing systems are InvoiceNow-ready or whether upgrades, integrations or new vendors are required.
Practical issues
- Determining the correct implementation date: Existing GST-registered businesses should confirm their annual supplies and monitor IRAS notifications expected by mid-2026.
- Software capability: Businesses should verify whether their current accounting or finance software supports InvoiceNow transmission to IRAS.
- Data quality: Customer details, GST registration numbers, tax codes, invoice descriptions and supply classifications should be reviewed before implementation.
- Process changes: Finance teams may need updated procedures for invoice issuance, credit notes, amendments and error correction.
- System controls: Firms should consider access controls, approval workflows and audit logs for invoice data transmitted through InvoiceNow.
- Training needs: Staff involved in invoicing, GST reporting and finance operations will require guidance on new responsibilities.
- Excluded entities: Overseas vendors and businesses registered only under Reverse Charge rules should confirm whether they fall outside the requirement.
Action points
GST-registered businesses should treat the InvoiceNow requirement as a tax compliance and systems-readiness project, rather than a purely administrative change. Early preparation will help reduce implementation risk and avoid disruption when the relevant phase becomes effective.
Recommended next steps include:
- Confirm the business’s expected implementation phase.
- Assess whether existing accounting or billing software is InvoiceNow-ready.
- Review invoice data quality and GST coding.
- Update internal GST compliance workflows.
- Monitor IRAS communications, particularly for businesses registered before 2026.