IFSC Code UBIN0901521 — Kolkata Dharamtolla, Union Bank of India,

Q: What is IFSC code UBIN0901521 and which branch does it identify?

IFSC code UBIN0901521 is the 11-character alphanumeric code assigned by the Reserve Bank of India to the Kolkata Dharamtolla branch of Union Bank of India in Kolkata, West Bengal. The first four characters (UBIN) identify the bank across the entire RBI NEFT network, the fifth character is always zero (0), and the last six characters (901521) identify this specific branch. No other branch in India shares this exact 11-character combination. Use UBIN0901521 for NEFT, RTGS, IMPS transfers and to link this account to UPI apps like PhonePe, Google Pay, and BHIM.

Q: How do I use IFSC UBIN0901521 to link my Union Bank of India account to UPI?

To link your Union Bank of India Kolkata Dharamtolla account to UPI, open any UPI app — PhonePe, Google Pay, Paytm, or BHIM — and select "Add bank account". Choose Union Bank of India from the bank list. The app will auto-detect your registered mobile number and retrieve your account. During verification, the app validates your account against IFSC UBIN0901521 in the background — you do not need to enter the code manually. Once linked, your UPI VPA (such as yourname@unionbankofindia) is used for daily payments. The IFSC is only needed during this initial account registration step, not for individual UPI transactions.

Q: What is the NEFT settlement time using IFSC UBIN0901521? Is RTGS faster?

NEFT transfers to Kolkata Dharamtolla using IFSC UBIN0901521 settle in half-hourly batches — available 24 hours a day, 7 days a week including public holidays. A transfer sent at 2:10 PM is batched at 2:30 PM and credited shortly after. There is no minimum or maximum amount for NEFT. RTGS is faster but has a ₹2 lakh minimum. RTGS settles in real time during RBI operating hours (7:00 AM to 6:00 PM on working days). For transfers below ₹2 lakh that need to arrive instantly — including on weekends and bank holidays — use IMPS with IFSC UBIN0901521, which settles within seconds, 24×7, year-round.

Q: How long is the beneficiary cooling period when I add IFSC UBIN0901521 to net banking?

When you add a new beneficiary using IFSC UBIN0901521 in net banking or mobile banking, most banks enforce a cooling period of 30 minutes to 24 hours before the first transfer is permitted. During this window, the bank sends a confirmation OTP or push notification and blocks outgoing transfers to the new beneficiary. This is a fraud-prevention measure. After the cooling period, per-transaction and per-day limits apply based on your bank's policy and your account type. If you need to transfer money urgently to a Union Bank of India Kolkata Dharamtolla account, add the beneficiary at least one business day in advance. UPI payments bypass beneficiary cooling periods entirely — they can be initiated to a new UPI ID without any wait.

Q: Has Union Bank of India's IFSC code changed due to a bank merger? Is UBIN0901521 still active?

Bank mergers in India can deactivate IFSC codes. When the RBI merges two banks, it typically issues new IFSC codes for the surviving entity's branches and deactivates old codes from the absorbed bank — sometimes immediately, sometimes on a scheduled date. If Union Bank of India was involved in a merger, branches of the absorbed bank received new IFSC codes under the surviving bank's code prefix. IFSC UBIN0901521 is listed as active in our database as of Jun 2026. However, before initiating a large RTGS or NEFT transfer, we recommend verifying on the RBI's official IFSC lookup to confirm the code remains valid.

Q: Why does the 5th character of IFSC UBIN0901521 have to be zero (0) and not the letter O?

The 5th character of every IFSC code — including UBIN0901521 — is always the digit zero (0), not the letter O. The RBI mandated this design: position 5 is permanently reserved for future use and is always set to the numeral 0. In many printed fonts and small screens, the digit 0 and the letter O look nearly identical, but they are entirely different ASCII characters. If you type the letter O instead of 0, the payment system will reject the transfer immediately with an "invalid IFSC" error — no transfer will be processed and no money will leave your account. If a transfer to this branch fails IFSC validation, check position 5 of the code first: it must be the digit 0.

IFSC Code for Kolkata Dharamtolla — Union Bank of India

The IFSC code for Kolkata Dharamtolla branch of Union Bank of India in Kolkata, West Bengal is UBIN0901521. Use this for NEFT, RTGS, IMPS transfers and UPI account linking.

About IFSC Code UBIN0901521 — Kolkata Dharamtolla, Union Bank of India

IFSC code UBIN0901521 is the official 11-character alphanumeric identifier assigned by the Reserve Bank of India to the Kolkata Dharamtolla branch of Union Bank of India located in Kolkata, West Bengal. This code is used exclusively by India's electronic payment networks — NEFT, RTGS, IMPS, and UPI — to route digital fund transfers to the exact bank branch where the recipient's account is held. IFSC codes are not used for cheque clearing or paper-based instruments; those processes use the MICR code printed on cheque leaves. Without the correct IFSC code, no digital transfer to this branch can be processed.

How to Read IFSC Code UBIN0901521

The 11-character code UBIN0901521 is structured in three segments the RBI uses to route every NEFT and RTGS transfer: UBIN is the bank identifier — a four-letter code that identifies Union Bank of India in the RBI's settlement network. 0 is the reserved zero at position 5 — always the digit 0 (never the letter O), mandated by the RBI for future use. 901521 is the branch identifier — six alphanumeric characters assigned exclusively to the Kolkata Dharamtolla branch. No other branch in India carries this exact combination, which is what allows NEFT and RTGS systems to credit funds to one specific branch out of more than 1.6 lakh branches nationwide.

NEFT, RTGS, IMPS, and UPI — When to Use IFSC UBIN0901521

IFSC code UBIN0901521 is required every time money moves digitally to or from the Kolkata Dharamtolla branch.

NEFT — Any Amount, Half-Hourly Batches: Settles in half-hourly batches, available 24×7. The sender enters your account number + IFSC UBIN0901521.
RTGS — Minimum ₹2 Lakh, Real-Time Settlement: Funds arrive in real time. Operates 7:00 AM to 6:00 PM on RBI working days.
IMPS — Instant Transfers, 24×7 Including Holidays: Settles within seconds. Up to ₹5 lakh per transaction using account number + IFSC.
UPI Account Linking — One-Time Registration: The app validates IFSC UBIN0901521 in the background during account setup.
Net Banking Beneficiary Registration: Add using account number + IFSC UBIN0901521. Allow 30 min–24 hour cooling period.

IFSC, MICR, and BSR Codes for Kolkata Dharamtolla, Union Bank of India

The Kolkata Dharamtolla branch is assigned three distinct RBI codes — each used by a completely separate banking system. These codes cannot be interchanged.

IFSC UBIN0901521 — NEFT, RTGS, IMPS, and UPI account linking.
MICR 700026172 — Cheque clearing, ECS, NACH, SIP mandates. View MICR code →
BSR 0002902 — TDS challan deposits, Form 16, Form 26AS. View BSR code →

Step-by-Step: How IFSC UBIN0901521 Routes a NEFT Transfer

Initiation: Sender enters account number and IFSC UBIN0901521.
Validation: Sender's bank validates the IFSC against the RBI NEFT master list.
Bank routing: UBIN identifies Union Bank of India as the receiving bank.
Branch routing: 901521 routes to Kolkata Dharamtolla specifically.
Settlement: At the next NEFT batch, RBI credits Union Bank of India who credits the beneficiary account.

Common Mistakes to Avoid with IFSC UBIN0901521

Using MICR or BSR instead of IFSC — they serve completely different systems and will be rejected.
Typing letter O instead of digit 0 at position 5 — will fail IFSC validation immediately.
Using a deactivated IFSC after a bank merger — always verify before large RTGS transfers.
Using the wrong branch IFSC — funds route to the branch identified, not any branch of the same bank.
Not accounting for beneficiary cooling period — add beneficiaries at least one business day in advance.

Need this branch's MICR code? View MICR code for Kolkata Dharamtolla →

For TDS challan filing use the BSR Code Lookup. Plan loan repayments with our EMI Calculator.

Frequently Asked Questions

What is IFSC code UBIN0901521 and which branch does it identify?

How do I use IFSC UBIN0901521 to link my Union Bank of India account to UPI?

What is the NEFT settlement time using IFSC UBIN0901521? Is RTGS faster?

How long is the beneficiary cooling period when I add IFSC UBIN0901521 to net banking?

Has Union Bank of India's IFSC code changed due to a bank merger? Is UBIN0901521 still active?

Why does the 5th character of IFSC UBIN0901521 have to be zero (0) and not the letter O?