With December 31, 2025, just a day away, lakhs of taxpayers across the country are closely monitoring the status of their Income Tax Returns (ITRs) for the current assessment year. While a large number of returns have already been processed, a significant backlog remains, fuelling concerns over delayed refunds, missed opportunities for correction and the possibility of future tax demands.
Official data shows that around 8.5 crore ITRs have been filed and verified for Assessment Year (AY) 2025–26 so far. Of these, nearly 7.8 crore returns have already been processed by the Centralised Processing Centre (CPC). However, more than 70 lakh returns were still pending processing as of December 28.
What actually changes after December 31
Contrary to common perception, December 31 does not determine the speed at which the Income Tax Department processes returns. Instead, it marks the final statutory deadline for taxpayers to voluntarily revise or file belated returns for the assessment year.
Once this date passes, taxpayers lose the right to revise their ITR on their own, even if the return has not yet been processed by the CPC. Tax experts say this distinction is frequently misunderstood, with many taxpayers assuming that pending processing allows unlimited time for corrections. In reality, the right to revise ends with the deadline, not with the completion of processing.
After December 31, any correction becomes procedural rather than voluntary, typically initiated only in response to a notice from the tax department.
Why so many returns remain unprocessed
Experts attribute a large share of pending ITRs to refund-related cases that have been put on hold due to data mismatches. Common issues include inconsistencies between Form 16 and the ITR, incorrect reporting of deductions, or claims related to political donations and exemptions that do not match departmental records.
This year alone, over 21 lakh revised returns have been filed, mostly following system-generated alerts and compliance reminders issued by the tax department.
If you don’t revise in time
If an ITR is processed after December 31 and the CPC makes adjustments—such as disallowing a deduction or exemption—the taxpayer’s options become limited.
Tax professionals note that taxpayers may still file an updated return (ITR-U) under Section 139(8A) for up to four years from the end of the assessment year. However, this route involves additional tax liabilities, with extra tax payable at 25%, 50%, 60% or 70%, depending on how late the updated return is filed, along with applicable interest.
Crucially, an updated return cannot be used to reduce tax liability or increase a refund. It is meant only for disclosing additional income or correcting under-reporting.
Does an unprocessed return mean your refund is lost?
The short answer is no. A refund does not lapse merely because an ITR remains unprocessed after December 31.
The law allows the Income Tax Department sufficient time to complete processing, and refunds that arise after processing remain payable. Where delays are not attributable to the taxpayer, interest is also payable as per statutory provisions.
However, refunds linked to unresolved mismatches may remain frozen until the issue is resolved through the limited mechanisms available after the deadline.
If a mismatch is confirmed and the taxpayer failed to revise the return in time, the CPC may issue an intimation under Section 143(1), raising a tax demand along with interest. In certain cases, the department may treat the lapse as misreporting of income, potentially attracting penalties ranging from 50% to 200% of the tax evaded under Section 270A.
How long can the tax department take to process returns
Under existing rules, the CPC has nine months from the end of the financial year in which the return is filed to process an ITR. For instance, a return filed on July 31 or December 31, 2025, can legally be processed any time up to December 31, 2026.
If the CPC fails to process the return within this period and the case is not selected for assessment or reassessment, the taxpayer becomes entitled to the refund along with interest under Section 244A, calculated up to the date the refund is actually issued.
Typically, once an ITR is processed, refunds are credited within about a week, though timelines may vary.
Interest on delayed refunds
When a refund becomes due, the government is required to pay simple interest at 0.5% per month, or 6% per annum, calculated on a monthly basis for the period of delay.
Why the deadline still matters
December 31 is not about whether a refund arrives sooner or later—it is about who controls the correction process. Before the deadline, taxpayers can rectify mistakes without penalty. After it, the system takes over, often at a significantly higher financial cost.
Tax advisers strongly urge taxpayers who have received mismatch alerts to review and act immediately, rather than assuming that processing delays will resolve the issue automatically. Once the revision window closes, even small oversights can become expensive to correct.
For taxpayers still waiting for their returns to be processed, the message is clear: the clock that truly matters is not the CPC’s—it is yours.
