GST Filing Process: Steps; Deadlines in IRAS Singapore

What is GST filing and do I need to file? GST filing is the process where GST-registered businesses report the GST they have charged on sales (output tax) and the GST they have paid on purchases (input tax) to IRAS. If your business is GST-registered — for example, if your annual taxable turnover exceeds S$1 million — you must file periodic GST returns and pay any GST due.

Filing GST returns requires declaring taxable supplies, reporting input and output tax, and making timely payments or claiming refunds. Accurate returns protect your business from penalties and ensure smooth operations with the tax authority.

This guide explains the GST filing process, the main return types (F5, F7, F8), deadlines and payment options, and practical steps to prepare and submit returns via the myTax Portal so your business stays compliant.

Quick next step: Check your accounting period and authorise the person who will file on myTax Portal — if your taxable turnover in the past 12 months is over S$1M, prepare to register and file quarterly.

What is a GST Return?

A GST return is the form you file with the IRAS to report the goods and services tax your business collected on sales (output tax) and claimed on purchases (input tax) for a specific accounting period. It shows your turnover, taxable supplies, and the net GST payable or refundable.

• Summary of Transactions: The return lists standard-rated and zero-rated supplies, exempt supplies, output tax (what you collected), and input tax (what you paid and can claim).
• Quarterly Filing: Most GST-registered businesses file returns quarterly — generally within one month after the end of the accounting period — though some businesses may have special accounting periods or monthly reporting requirements.
• Why it matters: Accurate returns determine your net GST position (Box 6 output tax minus Box 7 input tax) and help you avoid penalties and interest.
• Current GST rate: The prevailing GST rate is 9% (effective as of 2024); confirm the current rate on IRAS before filing.

Who is Required to File GST Returns in Singapore?

You must file GST returns if your business is GST-registered. Registration can be compulsory or voluntary depending on your taxable turnover and business decisions.

• Compulsory registration: If your annual taxable turnover exceeds S$1,000,000, you are required to register for GST and then file returns (typically quarterly).
• Voluntary registration: Businesses below the threshold can opt to register voluntarily — useful to claim input tax but it brings ongoing filing requirements and record keeping.
• Resident and non-resident taxable persons: Both resident and non-resident suppliers who meet registration criteria or make taxable supplies in Singapore must comply with filing requirements.

Quick checklist — do you need to register? If your taxable turnover in the past 12 months is > S$1,000,000 → register. If it’s below but you want to claim input tax, consider voluntary registration after weighing compliance costs.

Examples: A local retailer with annual sales of S$1.2M must register and file quarterly; a small exporter with S$600k turnover may register voluntarily to recover input tax on purchases.

Next step: Check your 12-month taxable turnover and the IRAS registration guidance to confirm requirements before filing.

GST Filing Process in Singapore

How do I file GST returns? Below is a practical, step-by-step process you can follow to prepare and submit GST returns through IRAS’ myTax Portal, with the roles and items to prepare for each step.

Step 1: Authorise users and assign roles

• Decide who will prepare the return (preparer) and who will approve and submit it (approver). Maintain separation of duties where possible.
• Grant the appropriate access: authorised filers must have the required rights via Corppass (for business account linking) and use SingPass to sign in to myTax Portal. Third-party tax agents must be authorised to file on your behalf.
• Checklist: ensure the filer has SingPass access, Corppass linkage, and the “Tax Filing” role for GST.

Step 2: Prepare the figures and supporting documents

• Gather sales invoices, purchase invoices, import documents, credit notes, and records of exempt or zero-rated supplies. Reconcile totals to your accounting system.
• Calculate Box 6 (output tax collected on sales) and Box 7 (input tax claimed on purchases). Keep working papers showing the calculations and source documents.
• Tip: keep a short checklist of required fields (period dates, turnover, taxable purchases, imports, input tax claims) so the preparer can complete the draft efficiently.

Step 3: File the GST return via myTax Portal

• Sign in to Business Tax Matters on the myTax Portal with SingPass.
• Navigate: Business Tax Matters → GST → File GST Return (choose F5/F7/F8 as applicable). Preparers can save drafts; approvers must review and submit.
• Ensure the figures match your supporting records. Use the portal’s validation messages to correct common errors before submission.

Step 4: Save acknowledgement and make payment

• After submission, save or print the acknowledgement page and reference number. This proves timely filing.
• If you owe GST, pay by the due date using GIRO, online banking, or other IRAS-prescribed methods. GIRO gives you an extra 15 days before funds are deducted.
• If you’re due a refund, IRAS typically processes straightforward refunds within about 30 days; complex returns under review may take longer.

Quick tips: keep clear preparer/approver roles, retain supporting documents for at least five years, and run a short pre-submission checklist (totals reconcile, evidence available, correct period selected).

Need help? If you use an agent, confirm their authorisation and ask for a copy of the acknowledgement after filing. For IRAS guidance, refer to the Corppass and myTax Portal pages linked above.

What details do I need to file each GST return?

Before you file a GST return, gather the specific details and supporting documents relevant to the return type you’ll submit. Below is a clear summary of required information for the common GST forms and quick examples to help you prepare accurate figures.

What does the GST F5 contain?

The GST F5 is the periodic GST return most businesses file (usually quarterly). It captures your taxable supplies, purchases, input tax claims, and the resulting net GST payable or refundable. Prepare these items before completing the form:

• Sales and revenue records: total standard-rated, zero-rated, and exempt supplies (Box 1–4).
• Purchase and import records: taxable purchases, imports, and approved-scheme imports (Box 5, 9, 14–17).
• Output tax (Box 6): GST collected on sales, adjustments for recovered debts and imported services.
• Input tax (Box 7): GST paid on purchases, eligible refunds, bad debt relief and import GST claims.
• Supporting documents: invoices, import permits, credit notes, and import/delivery records to substantiate claims.

Quick example: If your sales for the period are S$100,000 standard-rated, output tax (Box 6) at 9% = S$9,000. If eligible purchases are S$40,000 with input tax of S$3,600 (Box 7), net GST payable (Box 8) = S$9,000 − S$3,600 = S$5,400.

For online readers: keep a short checklist (period dates, totals for Boxes 1–5, Box 6 & 7 calculations, list of credits/deductions) to speed filing. Include links to the IRAS GST F5 form and myTax filing page for easy access.

Box	Particulars	What to Include	What to Deduct/Exclude
1	Standard-Rated Supplies	Sales, deposits, consignment sales, digital services, reimbursements	Out-of-scope supplies, GST collected before registration
2	Zero-Rated Supplies	Exported goods, international services	Credit notes, sales returns, discounts
3	Exempt Supplies	Residential property sales, financial services, forex gains, investment metals	–
4	Total Value	Sum of Boxes (1) + (2) + (3)	–
5	Taxable Purchases	Standard/zero-rated purchases, imports, business expenses	Credit notes, non-business expenses, non-GST suppliers
6	Output Tax Due	GST on sales, recovered debts, imported services	Credit notes, customer-accounted GST
7	Input Tax & Refunds	GST on purchases, refunds, bad debt relief, imports	Credit notes, private expenses, non-claimable expenses
8	Net GST Payable/Claimable	Box 6 – Box 7	–
9	Goods Imported under MES/A3PL	Imports under approved schemes	GST-exempt under these schemes
10	Tourist GST Refund	GST refunded to tourists	–
11	Bad Debt Relief & Reverse Charge Refunds	Claims for unpaid debts, reverse charge adjustments	–
12	Pre-registration Claims	Pre-GST registration input tax	–
13	Revenue	Sales, services, turnover	Grants, asset sales, collections for others
14	Imported Services & Low-Value Goods	Reverse charge applicable services	–
15	Remote Services via E-Marketplaces	Digital services supplied by marketplaces	–
16	Low-Value Goods via Redeliverers	Marketplace sales of imported goods	–
17	Imported Low-Value Goods	Direct sales of low-value imported goods	–
18-21	Import GST Deferment Scheme	Deferred GST on imports (IGDS)	This applies only to IGDS-approved businesses

What if I have no transactions (NIL Return)?

If your business had no taxable transactions during the accounting period, file a NIL F5 return by entering ‘0’ for the relevant boxes. Filing a NIL return keeps you compliant and avoids late‑filing penalties.

Worked NIL example: All sales = S$0, purchases = S$0, input tax claimed = S$0 → enter 0 in Boxes 1–8 and submit the F5 as NIL.

When should I file an F7 correction?

Use the GST F7 return to amend errors in previously filed returns when adjustments are material or when you need to claim a refund for overpaid output tax or under‑claimed input tax.

Decision checklist: If net GST error ≤ S$3,000 and other box adjustments (except Boxes 6, 7, 12) ≤ 5% of Box 4 or Box 5, you may correct the error in the next F5. Otherwise, file an F7.

Key points for F7: File within five years from the end of the relevant accounting period; submit electronically via myTax Portal and include corrected figures (Boxes 1–17) plus a breakdown of the errors and refund amounts.

What information is needed for an F8 (deregistration)?

File a GST F8 when you cancel your GST registration. The F8 requires similar data to an F5, plus details about business assets held on the last day of registration and supplies made before cancellation where invoices or payments occur after deregistration.

• Record asset values and supplies on the last day of registration (report in Box 1 and relevant boxes).
• Calculate GST to be accounted for on those assets (report in Box 6 and supporting schedules).
• Keep invoices and transfer evidence to substantiate the asset values and post‑deregistration invoices.

Final filing tip: treat the F8 like a final F5 with additional asset reporting — ensure all supporting documents are retained and reconciled to the figures you submit.

When are GST returns and payments due?

Understanding filing and payment dates helps avoid late penalties and manage cash flow. Below is the standard quarterly schedule for filing GST returns and the corresponding payment (GIRO) deduction dates — remember to confirm each year on the IRAS calendar as dates can shift for weekends or public holidays.

GST Accounting Period	Filing Due Date	Payment Due Date (Without GIRO)	GIRO Deduction Date (With GIRO)
Jan–Mar	30 Apr	30 Apr	15 May
Apr–Jun	31 Jul	31 Jul	15 Aug
Jul–Sep	31 Oct	31 Oct	15 Nov
Oct–Dec	31 Jan	31 Jan	15 Feb

Special accounting periods: If your business is on a special GST accounting period, the filing due date is one month from the end of that special period. Always check your assigned accounting period in your IRAS profile.

What if a due date falls on a weekend or public holiday? IRAS generally treats a deadline that falls on a weekend/public holiday as falling on the next working day — verify the IRAS due‑date calendar or the myTax Portal prompts when filing.

Example — cashflow impact: Without GIRO: you must pay GST on the filing due date (e.g., 30 Apr). With GIRO: your payment is deducted on the GIRO deduction date (e.g., 15 May), giving you up to 15 extra days to fund the payment.

Practical tips: add calendar reminders a week before filing due dates and one day before payment due dates; reconcile accounts at least two business days before filing to avoid last‑minute errors.

Where to confirm dates: Always confirm current dates on the IRAS website or download the 12‑month GST due‑date schedule from the myTax Portal before filing.

What happens if I file GST returns late or not at all?

Failing to file your GST return on time is an offense and can trigger financial penalties and other actions by IRAS. There is a clear distinction between penalties for late filing and charges or interest for late payment — both can apply depending on the situation.

• An immediate penalty of S$200 is typically imposed for late filing of a return.
• An additional S$200 may be imposed for every complete month the return remains outstanding.
• The usual cap on penalties per late return is S$10,000, though IRAS enforcement practice and amounts should be checked on the IRAS site for the latest rules.

Other consequences and interest: Late payment of GST (when you owe tax) can attract interest or late‑payment penalties separately from late‑filing fines. IRAS may also issue estimated assessments if returns are not filed.

If you missed a filing — practical steps: file the overdue return immediately via myTax Portal, save the acknowledgement, and pay any tax due. If you have a reasonable excuse or want to request remission of penalties, follow the IRAS remission process (apply early and provide supporting evidence) or consult a tax agent for assistance.

Where to get help: check IRAS guidance on penalties and remission or contact a licensed tax agent for representation — dealing with a late filing promptly reduces the risk of escalating penalties or legal action.

How can I stay compliant with GST filing?

Staying compliant means filing the correct GST return (F5/F7/F8) on time, keeping accurate records, and paying any GST due. Follow a simple checklist and use the myTax Portal to submit returns to the government on schedule.

• 1. Confirm registration and accounting period: Verify your GST registration status and the filing period assigned by IRAS.
• 2. Authorise your filer: Assign preparer and approver roles, ensure SingPass/Corppass access, and authorise any third‑party tax agent if used.
• 3. Prepare invoices and supporting documents: Reconcile sales, purchases, imports, credit notes, and input tax evidence before filing.
• 4. File and pay on myTax Portal: Submit the correct GST form, save the acknowledgement, and pay by the due date (or use GIRO for extended payment timing).
• 5. Set reminders and retain records: Use calendar alerts for filing dates and keep records for the required retention period (retain supporting documents and calculation workpapers).

Want a quick checklist? Download or print this five‑step list, or consult a licensed tax agent if your returns involve complex input tax claims or deregistration issues. Staying organized and proactive will reduce the risk of penalties and make filing GST returns a routine task.

Streamline Your GST Compliance with Hub

Managing GST returns manually doesn’t just take time—it increases the risk of calculation errors and late-filing penalties. While the myTax Portal is your final destination, the work starts long before you log in.

Hub simplifies the journey from invoice to submission. By centralizing your sales and purchase data, Hub helps you organize your records in real-time, making that end-of-quarter rush a thing of the past.

Why Singapore Businesses Use Hub:

• Effortless Reconciliation: Automatically track input and output tax so your Box 6 and Box 7 figures are always ready.
• Error Reduction: Minimize manual entry mistakes that lead to costly F7 corrections.
• Centralized Documentation: Store all your supporting invoices and import permits in one secure location for the required 5-year retention period.

Ready to spend less time on paperwork and more time growing your business?