InvoiceNow
The GST InvoiceNow Requirement, explained
Singapore is moving every GST-registered business onto structured e-invoicing over the Peppol network. Here is what that means for you — in plain language.
Built for the Peppol network
Watch an invoice travel the network
No PDFs, no re-typing. Your invoice leaves MUST as structured data, reaches your customer's software in seconds — and a copy reports itself to IRAS. That is the whole GST InvoiceNow Requirement, handled.
How InvoiceNow works — the five-corner model
Invoices travel system-to-system as structured data over the Peppol network. The fifth corner is what the new requirement adds.
Your accounting or ERP system (like MUST) issues the invoice as structured data — not a PDF.
Peppol Access Points transmit the invoice from your system to your customer’s system.
The invoice arrives directly inside their software, ready to approve and pay — no re-typing.
A copy of the invoice data flows automatically to IRAS via the Access Points. This is the "GST InvoiceNow Requirement".
Unlike Malaysia’s MyInvois, there is no approval wait, no UIN, no QR code. Invoices flow peer-to-peer; data is reported to IRAS.
A PDF attached to an email is not a structured e-invoice and does not meet the requirement.
Your deadline, by wave
1 April 2026 — in force now
Every new voluntary GST registrant must adopt InvoiceNow as a condition of registration. Non-compliance means refusal or cancellation of the GST registration.
1 April 2028
New compulsory GST registrants, and existing businesses with annual supplies up to S$200,000, must transmit invoice data to IRAS via InvoiceNow.
1 April 2029
Existing GST-registered businesses with annual supplies up to S$1 million.
1 April 2030
Existing GST-registered businesses with annual supplies up to S$4 million.
1 April 2031
All remaining GST-registered businesses. The whole network is on structured e-invoicing.
Check your deadline
When is InvoiceNow mandatory for you?
Two answers. Ten seconds. Your date.
Indicative, based on IRAS' published wave schedule. The letter IRAS sends your business is authoritative — we verify it during the free check.
Check your date
Received a letter from IRAS?
Don't wait for the deadline quarter
Businesses that move early pick their timeline, claim grants while budgets last, and migrate data calmly instead of during year-end closing.Your mandatory date is already assigned
Since mid-2026, IRAS has been writing to each GST-registered business with its individual InvoiceNow implementation date.
Annual supplies decide your wave
"Annual supplies" means Box 4 of your GST return for periods ending in calendar 2025 — we can read your wave straight off your filings.
15 minutes to know where you stand
Send us your letter — or just your UEN and GST registration date — and we will map your deadline, your grant eligibility and the cheapest compliant path.
InvoiceNow questions, answered
What exactly is the GST InvoiceNow Requirement?
GST-registered businesses must send invoice data to IRAS through the InvoiceNow network — Singapore’s national e-invoicing network built on the international Peppol standard. Invoices travel system-to-system as structured data, and a copy of the data flows automatically to IRAS via accredited Access Points.
I already email PDF invoices. Isn’t that enough?
No. A PDF attached to an email is not a structured e-invoice and does not meet the requirement. Invoices must be transmitted as structured data over the Peppol network.
What happens if I don’t comply?
For new voluntary GST registrants the requirement is already a condition of registration — non-compliance means refusal or cancellation of GST registration. For existing businesses, obligations attach to your assigned wave between 2028 and 2031.
Is MUST built for the InvoiceNow network?
Yes — MUST issues e-invoices in the Peppol PINT SG billing standard used by the InvoiceNow network, including the IRAS reporting flow required under the GST InvoiceNow Requirement.
Know your date. Claim your grants. Get compliant.
A 15-minute call tells you your mandatory date, what the Government will pay for, and what it takes — no obligation.