What is the difference between Section 139(5) revision and Section 139(8A) ITR-U?
Section 139(5) is a revision of the original return to correct mistakes — no additional tax other than interest under 234A / 234B / 234C. Multiple revisions allowed before AY end for timely-filed original returns; single revision for belated returns. Section 139(8A) ITR-U is a voluntary Updated Return for any AY within 24 months — additional 25% tax (income ≤ ₹50L) or 50% tax (income > ₹50L) on updated income. ITR-U cannot be further revised — but a fresh ITR-U can be filed within the 24-month window for additional disclosures.