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How to Apply for Company GST Registration in Singapore Online

If your business is growing in Singapore, one important compliance milestone is registering for Goods and Services Tax (GST). This indirect tax applies to most goods and services sold locally, and companies meeting the required turnover must register with the Inland Revenue Authority of Singapore (IRAS). Fortunately, the entire registration process can be done online through the MyTax Portal. In this guide, we explain everything you need to know to apply for company GST registration in Singapore online—step-by-step.



Understanding GST Registration Requirements

GST is currently levied at 9% in Singapore. If your company’s taxable turnover exceeds S$1 million in the past 12 months (retrospective basis) or is expected to exceed that in the next 12 months (prospective basis), GST registration is compulsory.

Companies below the threshold can still opt for voluntary GST registration to claim input tax or enhance business credibility. However, voluntary registrants must comply with GST filing and reporting requirements.

Step 1: Confirm Your Registration Status

Start by assessing whether your company needs to register. Use the GST Registration Calculator on IRAS's website to check if you meet the threshold. If you’re registering voluntarily, be prepared to provide supporting documents to prove your business is operational.

Step 2: Prepare the Required Information

To complete the online registration, gather the following:

  • Your company’s ACRA Business Profile

  • Financial documents (past or projected turnover)

  • Details of directors or business owners

  • GST accounting basis (invoice or payment)

  • GIRO form or bank details for future GST payments/refunds

If you're appointing an agent or accountant to handle the registration, you’ll also need an authorization letter.

Step 3: Access the MyTax Portal

Go to the IRAS website and access the MyTax Portal:

  1. Visit www.iras.gov.sg

  2. Click on "MyTax Portal"

  3. Log in using your CorpPass

Make sure your CorpPass account has been granted GST-related access.

Step 4: Fill in the Online Registration Form

Inside the portal, navigate to: “GST > Apply for GST Registration”

Complete the GST F1 form. You’ll need to provide:

  • Business structure details

  • GST effective date

  • Description of goods or services offered

  • Bank account details (if setting up GIRO)

  • Upload scanned copies of the required documents

Be sure to review your application thoroughly before submission.

Step 5: Submit Your Application Online

Once the form is completed and documents uploaded, submit the application through the portal. You’ll receive an acknowledgment email confirming your submission.

IRAS generally processes applications within 5 to 10 working days, though it may take longer if additional clarification or documents are needed. If approved, you’ll receive:

  • Confirmation of GST registration

  • Your GST registration number

  • Effective registration date

This GST number must be shown on all invoices issued to clients from the effective date.

Step 6: Set Up GIRO for Tax Transactions

To simplify your GST payments and refunds, set up a GIRO arrangement with IRAS. This can be done online via your corporate internet banking platform or by submitting a physical GIRO form.

After Registration: Key Responsibilities

Once registered, your business must:

  • Charge 9% GST on all taxable sales

  • File quarterly GST returns (Form F5)

  • Keep accurate transaction records

  • Submit returns by the due date

Failure to meet these obligations could result in penalties or audits, so it’s important to stay on top of your compliance.

Professional Assistance Makes a Difference

Applying for GST registration might seem straightforward, but incorrect data, missing documents, or misunderstanding IRAS requirements can delay approval or result in fines.

To ensure smooth and accurate registration, many businesses engage professional assistance. WZWU & Partners, a leading audit and compliance firm in Singapore, provides end-to-end GST registration and advisory services to help companies meet their obligations efficiently and confidently.

Final Thoughts

Getting your company registered for GST in Singapore is a crucial step if you’ve reached the taxable turnover threshold or want to enjoy the benefits of input tax claims. The online registration process is convenient but requires careful attention to detail.

By following the right steps and submitting a complete, accurate application, your business can stay compliant and continue operating smoothly. And if you prefer to leave the technicalities to the experts, partnering with a professional firm can offer peace of mind and long-term benefits.

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