What business owners need to know
Timely GST compliance is crucial for every GST-registered business in Singapore. Missing filing deadlines or late payments can result in penalties and unnecessary cash flow stress. This guide explains the due dates, rules for extensions, penalties, and how refunds work, so entrepreneurs can plan ahead with confidence.
1. Standard Filing & Payment Deadlines
Your GST return and payment are due one month after the end of your accounting period.
Without GIRO Arrangement
GST Accounting Period | Filing & Payment Due Date |
Jan – Mar | 30 Apr |
Apr – Jun | 31 Jul |
Jul – Sept | 31 Oct |
Oct – Dec | 31 Jan |
With GIRO Arrangement
GST Accounting Period | Filing Due Date | GIRO Deduction Date |
Jan – Mar | 30 Apr | 15 May |
Apr – Jun | 31 Jul | 15 Aug |
Jul – Sept | 31 Oct | 15 Nov |
Oct – Dec | 31 Jan | 15 Feb |
👉 With GIRO, deductions happen on the 15th of the month after the payment due date. Always ensure sufficient funds and a high enough GIRO limit to avoid failed deductions.
2. Special Accounting Periods
If you are on a special accounting period, the deadline is one month after the end of that period.
Example: For a GST period from 5 Apr 2021 to 5 Jul 2021, the due date is 5 Aug 2021.
3. Extensions to Filing Deadlines
Generally, IRAS does not grant extensions since one month is already considered reasonable. Businesses are expected to maintain proper systems and resources for timely filing.
However, extensions may be granted in limited cases.
Acceptable Reasons & Maximum Extensions
Reason | Supporting Documents | Max Extension |
Newly registered business (1st return) | Nil | 1 month |
Breakdown of computer system | IT servicing report | 2 weeks |
New accounting software/IT system | Tax invoice | 2 weeks |
Key accounting staff on long medical leave | Medical certificates | 2 weeks |
Company restructuring | Restructuring notice | 2 weeks |
Software/API filing issues | Nil | 2 weeks |
Unacceptable Reasons (No Extension Granted)
- Staff on maternity leave
- Key personnel overseas
- Staff resigned without handover
- Year-end closing of accounts
- Inexperienced new staff
- No computer
- Insufficient manpower
Application Process:
- Submit extension request at least 5 working days before the due date with supporting documents.
- Late requests may not be processed in time, and penalties for late filing will still apply.
4. Penalties for Late Filing or Payment
- Late filing → Penalties imposed by IRAS.
- Late payment → Additional penalties, interest, and potential cancellation of GIRO arrangements.
Staying compliant avoids unnecessary financial and reputational costs.
5. Receiving GST Refunds
Since 3 Jan 2022, IRAS no longer issues refund cheques. Refunds are made electronically via:
- GIRO, or
- PayNow (Corporate account)
👉 If you’ve signed up for both, refunds will be credited to your GIRO bank account.
Refund Timeline:
- Refunds are made within a period equivalent to your accounting cycle (monthly or quarterly) after IRAS receives your GST return.
- For quarterly filing: refunds will be made within 3 months.
- Refunds may be delayed if you have outstanding GST returns or if IRAS is auditing your return.
Summary Table: GST Deadlines & Key Rules
Area | Standard Rule | Key Notes |
Filing deadline | 1 month after end of accounting period | Applies to all businesses |
Payment deadline | Same as filing deadline | With GIRO, deducted 15th of following month |
Special accounting periods | 1 month after end of special period | E.g. 5 Jul → due 5 Aug |
Extension requests | Only for valid reasons | Submit ≥ 5 working days before deadline |
Refund method | GIRO or PayNow | Cheques no longer issued |
Refund timeline | Within prescribed accounting period | May delay if returns outstanding or under review |
Key Takeaway for Entrepreneurs
Staying on top of GST deadlines is essential to avoid penalties and protect your cash flow. Set internal reminders, automate payments via GIRO, and apply for extensions only if you meet the strict IRAS criteria.
Disclaimer: This article is based on IRAS guidelines on GST filing, extensions, and refunds. It is provided for general guidance only and does not constitute tax advice. For advice tailored to your business, please consult a qualified tax advisor.
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