GST InvoiceNow Grant Deadlines Come Before Your Mandate Date: Why Starting Late Costs More

TL;DR

• Your GST InvoiceNow date is when you must start. It is not when the help runs out. For most businesses the help runs out first.

• The S$1,000 Transition Grant only pays if you are submitting to IRAS before your own date. The grant window closes on 31 March 2030, or sooner if the funds are fully claimed.

• Businesses above S$4 million have the latest date (1 April 2031) but the earliest deadline. The S$5,000 grant project must be finished by 31 March 2028.

• IRAS says businesses submitting invoice data through InvoiceNow can expect a lower likelihood of audit and faster GST refunds.

• Starting early gives you practice quarters. A business on the 2029 wave that starts now gets about ten GST returns to iron out problems before it counts.

This article is accurate as of 7 October 2026. Grant terms, dates and solution lists are set by IRAS and IMDA and can change at any time. Check the official pages in Sources before you act, and speak to your tax adviser about your own situation. This is general information, not tax advice.

The IRAS letter gives you a date, and for most small businesses that date is two or three years away. The natural reaction is relief. One more thing that can wait.

If your invoicing still runs on an old desktop program or a spreadsheet that one person guards, that relief is understandable. Changing systems is disruptive, and nobody wants to do it before they have to.

But your date is only one of several deadlines. The grants that pay for the switch, and the quiet advantages IRAS gives early movers, all run on shorter clocks. Here is what each one means for your business.

1. Your date, in one paragraph

Existing GST-registered businesses come in four waves, from 1 April 2028 to 1 April 2031, depending on total supplies in GST periods that ended in 2025. IRAS has been notifying businesses registered before 2026 of their individual date since mid-2026. If you haven’t worked yours out, our guide to what InvoiceNow is and how the GST requirement works covers the phase table and how to calculate it. Before your date, switching on GST InvoiceNow submission is optional. IRAS strongly encourages starting early.

2. The deadlines that arrive before yours

The S$1,000 Transition Grant: be live before your own date

For businesses with 2025 total supplies of S$4 million or less, IMDA pays a fixed S$1,000 towards a paid, accredited InvoiceNow-Ready solution or a connection through an accredited Access Point. We covered the eligibility rules, including the three-month rule that catches people out, in our tax invoice template guide. Here, two timing rules matter.

First, you must be submitting invoice data to IRAS before your mandatory date. Second, the grant runs from 1 July 2026 to 31 March 2030, or until it is fully claimed, whichever comes first.

Put together, the 2028 and 2029 waves must be live before their own April deadline. The 2030 wave’s last chance is 31 March 2030, the day before its mandate. And because the terms say “whichever is earlier”, the real cut-off for everyone could arrive sooner than the calendar suggests.

The S$5,000 grant: three years before the mandate

Businesses with 2025 supplies above S$4 million are in the last wave, on 1 April 2031. Many will read that as the most time of anyone. The S$5,000 Transition Grant says otherwise.

It is for businesses connecting their own ERP (SAP, Microsoft Dynamics or a custom system) through an accredited Access Point. The project must start after 26 February 2026, be completed within 12 months, and be finished by 31 March 2028. Finished includes switching on GST InvoiceNow and submitting invoice data to IRAS. That is three years before the mandate and about 18 months from today. ERP integration projects rarely run to schedule, so a project starting late in 2027 is already cutting it fine.

The Queen Bee Grant: a year early, with a network target

Larger businesses may also qualify for the S$25,000 InvoiceNow Queen Bee Grant, alongside the S$5,000 grant. It needs more than S$4 million in annual turnover, at least 200 suppliers or business customers, its own custom ERP, and more than a year since incorporation. The integration must be finished by 31 March 2030. By 31 March 2031, the business must either receive InvoiceNow invoices from at least 20 suppliers or send them to at least 40 customers. That second target can’t be reached in a rush, because it depends on your trading partners joining too.

Free packages: check the end date, not just the price

IMDA lists free-of-charge InvoiceNow packages for GST-registered businesses, and the scheme runs to March 2031. End dates differ by provider, though: most run to 31 March 2031, and some stop on 31 March 2027. Free packages also don’t count towards the S$1,000 grant. Choose your route deliberately, as we explain in the template guide.

3. IRAS has said early submitters look lower-risk

Opening IRAS’s first InvoiceNow Fair, Deputy Commissioner Dennis Lui said businesses that submit invoice data through InvoiceNow can expect a lower likelihood or frequency of audit, and faster access to GST refunds. He also said businesses not submitting invoice data regularly “carry a higher risk profile by default.”

That doesn’t mean a business on the 2030 wave will be audited for waiting. It does mean that between now and your date, the businesses that started early are the ones IRAS can see most clearly. For anyone who regularly claims GST refunds, faster processing is worth having for as many quarters as possible.

4. Practice quarters are the cheapest ones you’ll get

Once you submit invoice data, IRAS can compare each invoice against your GST return. PwC advises businesses to be ready to explain or reconcile any difference between the two. The first few quarters usually surface old problems: tax codes set up years ago and never checked, credit notes raised outside the system, foreign-currency rounding, and supplier bills that arrive as PDFs.

Every quarter you submit before your date is a rehearsal. Mistakes cost you an afternoon of fixing, with no compliance deadline attached. Leave it until your mandatory quarter and the same fixes happen under filing-deadline pressure, with nothing to compare against.

There is also a crowd to consider. KPMG estimates the remaining waves bring about 90,000 more businesses onto the network between 2028 and 2031. The months before each April deadline will be busy for software providers and implementers. Choosing and setting up while nobody is rushing you gives you room to compare options and say no to a bad fit.

5. The countdown table

Find your row. This is the table to print, pin up, or send to your business partner.

*Counted from 7 October 2026, assuming calendar-quarter GST periods. All grants run from 1 July 2026 to 31 March 2030 or until fully claimed, whichever is earlier, and have further conditions on IMDA’s grant page.

6. A calm 90-day plan

• Month 1: decide your route. Confirm your date and wave from the table. Decide whether you are going for a free package or a paid solution with the grant. You can’t easily switch routes later, so make this call first. If you’re on older desktop software, ask your vendor in writing whether your exact version can submit invoice data to IRAS. IMDA treats that as a separate requirement from simply sending e-invoices.

• Month 2: set up. Subscribe or connect, get your Peppol ID, and tidy customer and supplier records, especially UENs and GST registration numbers. If you’re claiming the grant, apply as soon as you meet the conditions rather than waiting for the window’s final months.

• Month 3: go live on one quarter. Switch on GST InvoiceNow submission for one GST period. Before you file that return, reconcile what was submitted against your GST F5 and fix what doesn’t match.

After that, every quarter before your date is a rehearsal, and the date on IRAS’s letter becomes just another day.

Frequently asked questions

• Our mandatory date is 1 April 2030. Can we still get the S$1,000 grant?
  Yes, if you meet the conditions and are submitting invoice data to IRAS by 31 March 2030, while funds remain. The grant is available until 31 March 2030 or until fully claimed, whichever is earlier, so don’t plan around the last month.

• We have our own ERP and our 2025 supplies were above S$4 million. When do we need to start for the S$5,000 grant?

  The project must start after 26 February 2026, finish within 12 months, and be completed by 31 March 2028, including submitting invoice data to IRAS. In practice that means starting in 2027 at the latest, earlier if your ERP has customisations.

• Can one business get both the S$5,000 grant and the Queen Bee Grant?

  IRAS says businesses may be eligible for both, provided they meet each grant’s conditions. The Queen Bee Grant adds requirements on turnover, trading partners and InvoiceNow usage.

• We run several GST-registered companies. Does each one qualify?

  EY notes that each GST-registered entity within a group may qualify, which can add up for groups. Check each entity against the conditions on IMDA’s grant page.

• If we start early, are we treated as mandated from that point?

  Before your mandatory date, IRAS says businesses can choose whether to activate GST InvoiceNow submission. Ask your solution provider how activation and any later changes work before you switch it on.

• Can we use the EDGE Grant instead?

  EDGE replaced PSG from 30 September 2026 and works differently from the InvoiceNow grants. See PSG Has Ended: What the New EDGE Grant Means and check which support fits the solution you choose.

Where AveriWorks fits

AveriWorks is a cloud ERP for Singapore businesses, and it is on IMDA’s list of free-of-charge InvoiceNow packages for GST-registered businesses. The free Starter plan includes double-entry accounting, unlimited InvoiceNow and GST InvoiceNow for one user, so you can start your practice quarters at no cost.

If you need inventory, order processing, more users, or the data import wizard to bring records over from older software, the Business plan is S$66 a month, billed annually (before GST). Check your grant eligibility before you choose which route to take.

Start free at averiworks.com/register, or compare plans.

Sources

All sources accessed on 7 October 2026. This article is accurate as of 7 October 2026. Requirements, dates and grant terms may change; always check the latest IRAS and IMDA guidance.

1. IRAS, GST InvoiceNow Requirement. https://www.iras.gov.sg/taxes/goods-services-tax-(gst)/gst-invoicenow-requirement

2. IRAS, Committee of Supply 2026: Extension of GST InvoiceNow Requirement to All GST-registered Businesses by April 2031 (26 Feb 2026). https://www.iras.gov.sg/news-events/newsroom/committee-of-supply-2026--extension-of-gst-invoicenow-requirement-to-all-gst-registered-businesses-by-april-2031

3. IRAS taxBytes, Government Support to Help Businesses Transition to the GST InvoiceNow Requirement (updated 8 Jul 2026). https://www.iras.gov.sg/who-we-are/what-we-do/annual-reports-and-publications/taxbytes-iras/gst/government-support-to-help-businesses-transition-to-the-gst-invoicenow-requirement

4. IMDA, InvoiceNow Grants. https://www.imda.gov.sg/how-we-can-help/nationwide-e-invoicing-framework/invoicenowgrants

5. EY, Indirect Tax Alert: GST InvoiceNow grants (July 2026). https://www.ey.com/content/dam/ey-unified-site/ey-com/en-sg/technical/singapore-tax-alerts/documents/ey-sg-gst-invoicenow-grants-07-2026.pdf

6. IRAS, InvoiceNow Fair 2026 Opening Keynote Speech, Deputy Commissioner Dennis Lui. https://www.iras.gov.sg/who-we-are/what-we-do/annual-reports-and-publications/taxbytes-iras/gst/invoicenow-fair-2026-opening-keynote-speech-iras-deputy-commissioner-dennis-lui

7. KPMG Singapore, Tax Alert 2026/01. https://assets.kpmg.com/content/dam/kpmgsites/sg/pdf/2026/03/taxalert-202601-updated.pdf

8. PwC Singapore, Tax Bulletin (March 2026): GST InvoiceNow requirement becomes compulsory. https://www.pwc.com/sg/en/tax/assets/bulletin/202603.pdf

9. IMDA, Guide for Accreditation as InvoiceNow-Ready Solution Provider (2025). https://imda.gov.sg/-/media/imda/files/programme/nationwide-e-invoicing-framework/peppol-ready-accounting-erp-solution-providers/irsp-accreditation-guide-2025.pdf

10. IMDA, Free-of-charge InvoiceNow packages for GST-registered businesses. https://file.go.gov.sg/invoicenow-focpackage-gstbiz.pdf

11. AveriWorks, Pricing. https://averiworks.com/pricing