Tax Consultant
1935 Points
Posted on 31 August 2026
A 26QB default notice after filing usually means one of these: interest or penalty not paid, PAN mismatch between buyer/seller/property details, or the challan is mapped to the wrong assessment year.
Here is how to diagnose it step by step:
1. Log in to traces.gov.in with your buyer PAN and check the 26QB challan status under Statements and Forms. If it shows BOCE (Booked with no Certificate Issued) instead of BOMD (Matched and Challan Matched), there is a mismatch.
2. Check the exact demand amount. If it is small (below Rs 1,000), it is likely interest under Section 201(1A) , 1 percent per month from the date of payment to the seller to the date 26QB was filed, plus 1.5 percent per month from the date of filing to the date of payment into the government account.
3. If the demand is larger, the system may not have matched your 26QB with the seller PAN. Call TRACES helpdesk with the 26QB acknowledgment number and ask for a challan verification.
For most default notices, the resolution is paying the interest component via a new 26QB challan (selecting the same assessment year and using the original 26QB token number as reference). If you cannot resolve it online, a letter to the Assessing Officer under Section 201 with the original challan proof is the next step.
This [TDS mistakes guide](https://taxgarden.in/blog/tds-mistakes-that-trigger-notices-pan-section-challan-return-errors-2026) covers the common 26QB errors and the exact steps for correcting default demands.