How to validate a GST number online?

Enter the GST number, we check the format, then verify against official sources (IRAS) via our API.

Is GST verification free?

Format and checksum are free; server lookups may be rate-limited.

Validate GST Number Singapore Online | Free GST Check Tool

Singapore GST Validation

Validate GST Number in Singapore Online

Quickly and accurately validate GST (Goods and Services Tax) registration numbers for businesses in Singapore.

Tax ID Number:

Frequently Asked Questions

How can I validate a GST number online in Singapore?

You can validate any Singaporean GST number using Lookuptax's free GST checker. Enter the GST number to confirm its validity and retrieve business details from IRAS.

Is GST validation mandatory for invoices?

Yes, for GST-registered businesses, it is mandatory to show the GST registration number on all tax invoices. Validating this number ensures that you can claim input tax credits correctly.

Can I integrate GST validation into my billing system?

Yes. Lookuptax provides a GST validation API that can be integrated with invoicing, ERP, or billing platforms to automate compliance with Singaporean tax regulations.

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