To generate UDIN on the ICAI portal (udin.icai.org): log in with your membership number and mobile OTP → click "Generate UDIN" → select the document type from the dropdown → enter the document date, financial year, and 2–3 key financial figures from the document → click Generate. You get an 18-digit UDIN instantly that must be written or stamped on the document before delivery.
Step-by-Step: Generating UDIN on udin.icai.org
- Go to udin.icai.org — the official ICAI UDIN portal. Do not use any other website.
- Click Login. Enter your 6-digit ICAI membership number and your registered mobile number. An OTP will be sent to your ICAI-registered mobile.
- Enter the OTP within 3 minutes. You will be logged into your UDIN dashboard.
- Click "Generate UDIN" on the dashboard.
- Select the document type from the dropdown. Options include: Tax Audit Report (Form 3CA/3CB), GST Audit Report (Form 9C), Financial Statement Certification, Net Worth Certificate, Form 15CB, Transfer Pricing Certificate, and many others.
- Enter the document date. This is the date you signed/certified the document — not today's date unless you are generating UDIN on the same day.
- Enter the financial year to which the document pertains.
- Enter key financial figures. The portal will ask for 2–3 numbers from the document (turnover, net profit, total assets, etc.). These create a verifiable fingerprint. Enter them exactly as they appear in the document.
- Click Generate. Your 18-digit UDIN is created immediately.
- Copy the UDIN and write/stamp it on the document. You can also download the UDIN certificate from the portal for your records.
Where to Write the UDIN on the Document
The UDIN must appear alongside your signature. Common placements:
- Below the CA's signature block on the last page of audit reports
- On the certificate header or footer for standalone certificates
- In the body of Form 15CB, next to the "Certificate" heading
Format: "UDIN: [18-digit code]" in small but readable type.
Common Errors and How to Fix Them
| Error | Cause | Fix |
|---|---|---|
| OTP not received | Mobile number not updated in ICAI records | Update mobile at selfservices.icai.org first |
| Document type not in dropdown | Certain documents were not added in earlier portal versions | Choose the nearest equivalent; note the mismatch in your UDIN register |
| Financial figure mismatch error | Figures entered don't match the document's actual numbers | Re-check the document; enter figures in lakhs if prompted |
| UDIN already generated message | Someone else generated UDIN for the same document | Check with your partner — each document needs only one UDIN |
How Long Does UDIN Generation Take?
The actual UDIN generation takes under 2 minutes if you have the document in front of you. The bottleneck is usually gathering the correct financial figures. Best practice: have the signed document open before starting the UDIN process so you can enter figures accurately without interruption.
Log every UDIN automatically as you generate it. TaxZeo's UDIN tracker records each UDIN against the client and document type, keeping your UDIN register ICAI peer review-ready at all times.
Explore TaxZeo →Frequently Asked Questions
Can an article assistant generate UDIN on behalf of a CA?
No. UDIN can only be generated by the CA who signed the document, using their own ICAI credentials. Sharing login credentials is a violation of ICAI guidelines.
What is the time limit for generating UDIN after signing?
UDIN must be generated within 15 days of signing. Earlier it was 60 days; ICAI tightened this. Generate it on the day of signing to avoid forgetting.