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Property Sellers: Recalculate Advance Tax After New Cost Inflation Index Release

By Arth Vani Desk · 2026-07-18

Individuals who sold property acquired before July 23, 2024, must re-evaluate their tax liabilities following the delayed notification of the Cost Inflation Index (CII). Failure to adjust advance tax payments in upcoming installments could lead to interest penalties under Income Tax rules.

Key takeaways

Individuals who sold property acquired before July 23, 2024, must re-evaluate their tax liabilities following the delayed notification of the Cost Inflation Index (CII). Failure to adjust advance tax payments in upcoming installments could lead to interest penalties under Income Tax rules.

If you sold a residential or commercial property recently, your tax calculations might need a quick second look. The government’s delay in notifying the Cost Inflation Index (CII) for the financial year 2024-25 (Assessment Year 2025-26) has created a unique situation for taxpayers who sold assets early in the year. Since the first installment of advance tax was due by June 15, many sellers had to estimate their capital gains without the official inflation adjustment figure.

Why the Cost Inflation Index Matters

The CII is a crucial tool used by the Income Tax Department to help taxpayers calculate 'indexed cost of acquisition.' This process allows you to adjust the purchase price of your property against inflation, effectively reducing your taxable long-term capital gains. For properties acquired before July 23, 2024, taxpayers still rely on these indexation benefits to determine their exact tax outgo.

The Impact of the Delay

Because the index was released after the first advance tax deadline, many property sellers may have either underpaid or overpaid their initial installment. Under Indian tax laws, if you underestimate your tax liability and fail to pay at least 15% of your total annual tax by the first deadline, you could be liable to pay interest on the shortfall under Section 234C of the Income Tax Act.

Steps for Property Sellers

It is important to note that while the Union Budget 2024 proposed changes to indexation, the specific rules for properties held before the cutoff date of July 23, 2024, ensure that the CII remains a vital component of your tax planning for the current year.

This article is for informational purposes only and does not constitute professional tax advice. Please consult a chartered accountant for specific filings.

Frequently asked questions

What happens if I underpaid my first advance tax installment?

You should calculate the correct tax using the new CII and pay the difference in the next installment to minimize interest charges under Section 234C.

Does the new indexation rule apply to all properties?

The specific re-computation mentioned here applies to properties acquired before July 23, 2024, where indexation benefits are being claimed.

How do I find the latest Cost Inflation Index?

The CII is notified annually by the Central Board of Direct Taxes (CBDT) and is available on the official Income Tax Department website.

Source: ET Wealth
Investments are subject to market risks. This article is for informational purposes only and not financial advice.