The Short Answer
A DUNS number is a nine-digit business identifier issued by Dun & Bradstreet, an international commercial data company. It's used for business credit tracking and identity verification — required by platforms like Apple's Developer Program and Google Play Console's organization accounts.
A GST number (formally the GSTIN, or Goods and Services Tax Identification Number) is a 15-character registration number issued by the Indian government under the GST framework. It's a tax compliance requirement, not a business credit or verification tool, and it's mandatory once your business crosses specific turnover thresholds.
They're issued by completely different organizations, for completely different purposes, and having one doesn't create, replace, or influence the other in any way.
Side-by-Side Comparison
| Detail | DUNS Number | GST Number (GSTIN) |
|---|---|---|
| Issued by | Dun & Bradstreet (private company) | Government of India (GST Department) |
| Format | 9 digits | 15 characters (alphanumeric) |
| Purpose | Business identity & credit tracking | Tax registration & compliance |
| Mandatory? | Only if a specific platform/client requires it | Yes, once turnover crosses the threshold |
| Cost | Free (standard registration) | Free (government doesn't charge a registration fee) |
| Scope | International | India-specific |
| Used by | Apple, Google, international B2B partners, credit agencies | Indian tax authorities, invoicing, input tax credit claims |
What a GST Number Is Actually For
GST registration exists to bring your business into India's tax system. Once registered, you're required to charge GST on applicable sales, file periodic returns, and you become eligible to claim input tax credit on your business purchases. As of the 2026-27 financial year, GST registration is mandatory once your aggregate annual turnover crosses ₹40 lakh for businesses supplying goods, or ₹20 lakh for businesses supplying services (lower thresholds of ₹20 lakh and ₹10 lakh respectively apply in special category states).
There are also situations where GST registration is mandatory regardless of turnover — including e-commerce sellers, businesses making inter-state taxable supplies, casual taxable persons, and non-resident taxable persons. If any of these apply to you, you need a GSTIN even if you're nowhere near the standard threshold.
Where the Confusion Usually Comes From
Most of the mix-up happens because both are described online as "essential business registration numbers," which makes them sound interchangeable. In practice, they solve entirely different problems:
- A GST number tells the Indian government you're a tax-compliant, registered business.
- A DUNS number tells Dun & Bradstreet's global database — and anyone querying it — basic facts about your business's identity and credit history.
You could have a fully GST-registered business with an active GSTIN and zero presence in D&B's system. You could equally have a DUNS number for a business that isn't yet required to register for GST because it's under the turnover threshold. They simply don't overlap.
When You Need Which One
You need a GST number if:
- Your turnover exceeds ₹40 lakh (goods) or ₹20 lakh (services) in a regular category state
- You sell through an e-commerce platform
- You make inter-state taxable supplies
- You fall under any of the other mandatory-registration categories set by the GST Council
You need a DUNS number if:
- You're enrolling in Apple's Developer Program as an Organization
- You need Google Play Console organization verification
- An international client, supplier, or partner specifically asks for one during vendor onboarding
- You want a business credit profile that international lenders or partners can reference
Plenty of Indian businesses — especially ones focused purely on the domestic market with no plans to publish apps or work with international platforms — will only ever need a GST number and never touch the DUNS system at all. That's completely normal and not a gap in your paperwork.
Can You Get Both, and Does Order Matter?
Yes, you can hold both simultaneously, and there's no required sequence — you don't need a GSTIN before applying for a DUNS number, or vice versa. They're processed by entirely separate systems (the GST Department for GSTIN, Dun & Bradstreet for DUNS) that don't check against each other during registration. If you need both, you can apply for them independently, in whichever order suits your business timeline.
One practical note: when you do register for a DUNS number, having your business already registered and documented (which GST registration naturally provides — registration certificate, verified address, PAN-linked details) tends to make the DUNS application smoother, since you'll have consistent, ready documentation to submit.
Is Either One Ever Optional If You're Not Sure?
GST isn't optional once you cross the threshold — it's a legal requirement with penalties for non-compliance. A DUNS number, on the other hand, is need-based: if no platform, client, or process is asking you for one, there's no requirement to get one "just in case." If you're unsure whether your specific situation calls for a DUNS number, our Getting Started guide walks through exactly when it's actually necessary versus optional.
A Common Real-World Scenario
Here's a situation that comes up often enough to walk through directly: an Indian software company crosses ₹20 lakh in service revenue, registers for GST as required, and starts operating fully compliant with Indian tax law. Separately, that same company decides to publish an app under its business name on the Apple App Store. Apple's Organization enrollment asks for a DUNS number — and the company's GSTIN, despite being valid, properly filed, and linked to the same PAN, does nothing for that specific requirement.
The founder now has to go through a completely separate, unrelated registration process with Dun & Bradstreet, using much of the same underlying business documentation (registration certificate, address proof, authorized signatory details) but submitting it to a different organization entirely. This is the exact pattern that causes confusion — two valid, active registrations, serving two completely different gatekeepers, with zero technical connection between them.
What Renewal and Maintenance Look Like for Each
This is another area where the two diverge sharply. GST registration requires ongoing compliance — regular return filing (monthly, quarterly, or annually depending on your scheme), and penalties apply for late or missed filings even if your tax liability is zero for a period. It's an active, recurring obligation.
A DUNS number, by contrast, doesn't expire and has no renewal fee or periodic filing requirement. Once issued, it stays valid indefinitely unless your business closes or restructures significantly enough to require an update to your D&B record. The only reason you'd interact with your DUNS number again after getting it is if your business details change — a new address, a legal name change — or if you're disputing incorrect information on your record.