By CA Surekha S Ahuja
The UDIN generation process for tax audits has moved beyond a basic data-entry exercise.
The UDIN Directorate of ICAI has introduced field-level validation on the UDIN Portal for all sub-clauses of Section 44AB(a) to (e) while generating UDIN under the GST & Tax Audit category.
The implementation was announced on 11 February 2026, pursuant to the decision taken at the 442nd ICAI Council Meeting held on 26–27 May 2025.
The practical significance is important: the UDIN Portal now checks whether the information entered is consistent with the statutory conditions applicable to the selected tax-audit clause before permitting UDIN generation.
This makes it important for the tax auditor to determine the correct clause and verify the underlying figures before initiating UDIN generation.
What does the new validation check?
The portal applies different validation logic depending upon the sub-clause of Section 44AB selected.
| Section 44AB | Nature of case | Key validation |
|---|---|---|
| 44AB(a) | Business turnover | Cash transaction test and turnover threshold |
| 44AB(b) | Profession | Gross receipts must exceed ₹50 lakh |
| 44AB(c) | Lower income under 44AE / 44BB / 44BBB | Income must be lower than the prescribed deemed income |
| 44AB(d) | Presumptive income under 44ADA | Specified receipt, income and basic-exemption tests |
| 44AB(e) | Section 44AD(4) cases | Applicability of 44AD(4) and total-income test |
Section 44AB(a): Business turnover
The portal first asks whether cash transactions are within 5%.
- If Yes, turnover must be more than ₹10 crore.
- If No, turnover must be more than ₹1 crore.
Accordingly, the auditor should not merely enter the turnover figure. The cash-transaction condition must also be correctly determined before generating the UDIN.
Section 44AB(b): Profession
For professional receipts, there is no preliminary Yes/No question.
The validation requires:
Gross receipts > ₹50 lakh
Therefore, the gross-receipt figure entered on the portal should correspond with the amount reported in the tax-audit documentation.
Section 44AB(c): Lower income under Sections 44AE, 44BB or 44BBB
The portal asks:
Is the income claimed lower than the deemed income under Section 44AE / 44BB / 44BBB?
UDIN generation proceeds only when the answer is Yes.
This is a useful reminder that the clause under which the audit is being conducted should be identified from the actual basis of the tax-audit requirement and not merely selected mechanically.
Section 44AB(d): Presumptive income under Section 44ADA
This is the more detailed validation built into the portal.
The portal asks four questions:
- Is total gross receipts ₹50 lakh or less?
- Are gross receipts more than ₹50 lakh but not more than ₹75 lakh, with cash receipts not exceeding 5%?
- Is the income claimed lower than the deemed income under Section 44ADA?
- Is total income more than the basic exemption limit?
The validation logic is:
[(i) OR (ii)] AND [(iii) AND (iv)] = YES
In other words, at least one of the specified receipt conditions must be satisfied and both the lower-income and basic-exemption conditions must also be satisfied.
This is precisely the type of case where the auditor should complete the tax-audit eligibility analysis first and generate the UDIN thereafter.
Section 44AB(e): Cases covered by Section 44AD(4)
For Section 44AB(e), the portal asks:
- Is Section 44AD(4) applicable?
- Is total income more than the basic exemption limit?
Both answers must be Yes for the validation to permit UDIN generation.
Field-level validation and the 60-tax-audit ceiling are different controls
One point deserves particular attention.
The field-level validation introduced on the UDIN Portal and the ceiling of 60 tax audits per member are separate requirements.
The 60-audit ceiling is applicable from 1 April 2026 and covers the prescribed tax-audit categories, including:
- Form 3CA – third proviso to Section 44AB;
- Form 3CB – Section 44AB(a);
- Form 3CB – Section 44AB(b); and
- Form 3CB (Combined) under Section 44AB.
Thus, satisfying the field-level validation does not by itself mean that a UDIN can be generated if the applicable limit on tax audits has already been reached.
The two controls operate independently.
Further, the field-level validation introduced for the Section 44AB sub-categories continues to apply after 1 April 2026.
What should a tax auditor do before generating UDIN?
A simple internal pre-generation check can avoid an unsuccessful attempt at the final stage.
Before opening the UDIN generation screen, keep ready:
- the correct Section 44AB clause;
- the relevant Yes/No answers to the portal questions;
- correct turnover / gross-receipt figures;
- the assessee's PAN and other required particulars;
- the computation of total income, wherever relevant; and
- confirmation that the assignment is within the applicable tax-audit ceiling.
The figures and answers entered on the UDIN Portal should be capable of being reconciled with the tax-audit report, Form 3CD and the underlying computation.
A practical professional point
The new validation should not be viewed merely as a technical feature of the UDIN Portal.
It effectively requires the auditor to make the Section 44AB eligibility determination before UDIN generation. The UDIN process is therefore becoming increasingly integrated with the substantive conditions governing tax audit.
A good practice is to treat UDIN generation as the last step after completing the tax-audit eligibility checklist, rather than as an independent administrative formality.
If the portal rejects the generation because of a validation mismatch, changing the answer merely to obtain a UDIN would obviously not be the appropriate response. The underlying applicability of Section 44AB should first be re-examined.
Clarification from ICAI
For any clarification relating to the UDIN Portal or the field-level validation, members may contact the UDIN Directorate, ICAI at udin@icai.in.
Final Words
UDIN generation is no longer simply about entering four figures and obtaining a number. The portal is now testing the statutory conditions behind the selected Section 44AB category.
For the tax auditor, the safest sequence is therefore:
Determine the correct Section 44AB clause → verify the statutory conditions → reconcile the figures → check the audit-limit position → generate UDIN.
That small change in workflow can prevent avoidable UDIN-generation failures at the final stage.
