How to Authenticate and Respond to Income Tax Notices Effectively

What To Do When You Receive an Income Tax Notice in 2025: A Practical Step-by-Step Guide

If you’ve received a message, letter, or email claiming to be from the Income Tax Department (ITD), your first instinct might be to panic. But before you jump into replying—or worse, ignore it altogether—pause and verify if the notice is genuine. With digital scams and phishing attempts on the rise, taking a moment to authenticate the document could save you a great deal of stress and financial trouble later.

Step 1: Authenticate the Notice Using the Income Tax Portal

The Income Tax Department has made it easy to verify whether a notice, order, or communication was indeed issued by them.

Here’s how you can do it:

Option A: Using Your PAN and Assessment Details

Go to the official e-Filing portal: https://www.incometax.gov.in
On the homepage, find the section called “Quick Links”.
Click on “Authenticate notice/order issued by ITD”.
Choose “PAN-based” authentication.
Fill in these details:
- Your PAN (Permanent Account Number)
- Document Type (such as Notice, Intimation, or Order)
- Assessment Year as mentioned in the notice
- Date of issue (exact date as written in the notice)
- Your mobile number

Option B: Using the Document Identification Number (DIN)

If your notice contains a DIN—a unique 20-digit alphanumeric code—you can validate it even more directly:

Select the DIN-based authentication method on the portal.
Enter:
- The DIN from your notice
- Your mobile number

Step 2: Enter the OTP Sent to Your Mobile

You’ll receive a one-time password (OTP) on your registered mobile. Input the OTP to proceed to the results.

Step 3: Review the Authentication Result

If the notice is genuine:
- For PAN-based checks, the system will display the DIN and the date it was issued.
- For DIN-based checks, a confirmation message such as “Valid DIN” will appear.
If the notice is fake or untraceable:
- You’ll see an alert like “No record found for the given document number.” In that case, do not respond. Report or ignore such communication as needed.

What Type of Income Tax Notice Have You Received—and What Does It Mean?

Understanding the purpose of the notice is key. Here’s a quick breakdown of the most common sections under which notices are issued—and how you should respond.

Section	Why You Received It	What You Should Do
133(6)	Information request, often due to mismatches between your ITR and AIS/Form 26AS, or unusually high transactions	Log in to your e-filing account → Go to “Compliance Portal” → Submit requested documents → Consider filing a revised or updated return
142(1)	ITD wants further info or you haven’t filed your return yet	Respond with required details or file your return as directed
143(1)	Intimation after processing your return—may involve a refund, additional tax, or adjustment	Check the figures carefully → Agree or disagree via the portal within 30 days
143(2)	Your return has been picked for scrutiny (detailed review)	Start gathering supporting documentation → Upload them via “e-Proceedings”
148	The department believes you’ve missed disclosing some income	Take this seriously—either respond with explanations and evidence or file a new return
245	Your current refund is being adjusted against old dues	Accept the adjustment or raise an objection online within the given timeline

Best Practices: How to Handle a Valid Tax Notice

Once you've verified the notice is authentic, here are some dos and don'ts that’ll keep you compliant and protected:

Always Cross-Check the Details

Make sure the notice is actually addressed to you. Check the PAN, assessment year, and your name. If anything seems off, pause.

Understand Why You Received It

Notices are typically issued for reasons like TDS mismatches, missing returns, undeclared income, or unexplained financial transactions. Read the body of the notice carefully.

Respond Through the Correct Channels

Use the e-Proceedings or Compliance section in your income tax account. Never send documents over email unless explicitly asked to do so via the portal.

Upload Only Clear, Complete Information

Partial or incorrect submissions can complicate things. Keep it factual, complete, and relevant.

Don’t Miss the Deadline

Most notices come with specific response windows—usually 15 to 30 days. Mark it on your calendar and don’t delay.

Keep a Record of Everything

Save a digital and physical copy of:

The notice
Your reply
Acknowledgement/response confirmation from the portal

Consult a Chartered Accountant (CA) If You’re Unsure

If the notice involves reassessment, scrutiny, or major penalties, it’s wise to get professional help. A CA can guide your response and ensure you don’t make costly errors.

Common Red Flags That Trigger Tax Notices

The following can often lead to an ITD notice landing in your inbox:

Your ITR shows income that doesn’t match your TDS entries in Form 26AS or AIS
You haven’t filed your return for a year when your income exceeded ₹2.5 lakh (or the applicable exemption)
You’ve made large financial transactions (like property purchases or stock investments) without declaring matching income
You’ve failed to respond to a past notice
You have foreign assets or income that wasn’t disclosed

In Conclusion

Notices from the Income Tax Department can feel overwhelming—but if you verify their authenticity and respond within the system, they don’t need to become a problem. Think of them as a nudge rather than a threat.

Start with authentication. Follow the official process through the portal. And if anything seems complex or unclear, don’t hesitate to loop in a qualified tax expert. A well-informed, timely response is your best protection—not just from penalties, but from fraud, stress, and uncertainty.