State Govt DDO TAN Registration on Income Tax Portal - AIN Number Clarification

Hi Uttam,

Your question is quite relevant for many State Government Drawing & Disbursing Officers (DDOs) trying to register their TAN on the Income Tax e-Filing Portal, especially when dealing with Form 24G filings and BIN generation.

Let’s clarify this in detail:

🧾 Your Scenario Recap:

• You’re registering a State Govt. DDO’s TAN on the income tax portal.

• During registration, the portal asks for AIN (Account Office Identification Number).

• The DDO does not have its own AIN, but is mapped to a PAO’s AIN for 24G purposes.

• You’re unsure whether to:

  1. Use the PAO’s AIN to complete the registration

  2. Or apply for a new AIN for the DDO

✅ Clarification – What to Use

▶️ You Should Use the PAO’s AIN

As per NSDL & Income Tax Department guidelines:

• State Govt. DDOs do NOT need a separate AIN.

• They are mapped to their Pay & Accounts Office (PAO), who files Form 24G using their own AIN.

• The DDO’s TAN and payment details (like Book Identification Number – BIN) are linked through this PAO’s AIN in Form 24G.

🔄 So, while registering the DDO’s TAN on the income tax portal, you should:

• Enter the PAO’s AIN (the one used for 24G filing)

• Ensure the TAN-AIN mapping in Form 24G is correct and reflects recent data

🧾 Additional Notes:

• AIN (Account Office Identification Number) is issued only to AO-types like PAO/DTO/STO, not to individual DDOs.

• If the Income Tax portal throws errors, ensure:

  • The PAO’s 24G filing is up to date

  • Your DDO TAN is properly mapped in the 24G submission

• You can verify the mapping and BIN status here:
  👉 TIN NSDL BIN View

✅ Final Answer:

Use the PAO’s AIN with which your DDO TAN is already mapped for 24G filings.
❌ Do not apply for a new AIN for the DDO.