Cost Inflation Index in India: A Comprehensive Guide

Cost Inflation Index (CII) is a crucial financial tool in India that plays a significant role in determining the inflation-adjusted capital gains on the sale of various assets. Introduced by the Income Tax Department, the CII helps investors and taxpayers account for the impact of inflation when calculating gains on the transfer of capital assets. This article aims to provide a comprehensive guide to the Cost Inflation Index in India.

What is Cost Inflation Index?

The Cost Inflation Index is a numerical representation of the inflation rate in the economy, used to adjust the purchase price of an asset over time. This adjustment is necessary to reflect the real value of the asset after factoring in the impact of inflation. The Central Board of Direct Taxes (CBDT) releases the CII numbers every financial year, considering the changes in the wholesale price index.

How is Cost Inflation Index Calculated?

The formula for calculating the CII is relatively straightforward:

Cost Inflation Index (CII)=CII of the Previous Year/CII of the Current Year​

The base year for the CII is set as 2001-02, with an assigned value of 100.

Financial YearCost Inflation Index (CII)
2001-02 (Base year)100
New CII table

Significance of Cost Inflation Index:

  1. Capital Gains Calculation: The primary purpose of the CII is to adjust the purchase price of an asset when calculating capital gains for income tax purposes. The indexed cost of acquisition helps in determining the inflation-adjusted profit or loss on the sale of assets.
  2. Wealth Tax Valuation: The CII is also used in the valuation of assets for the purpose of wealth tax. It ensures that the value of assets is adjusted for inflation, providing a more accurate reflection of their current worth.
  3. Long-Term Capital Gains Tax: In India, the taxation of capital gains depends on whether the gains are short-term or long-term. CII becomes especially relevant when computing long-term capital gains tax, as it helps in mitigating the impact of inflation on the gains.
  4. Real Estate Transactions: Property transactions often involve substantial capital gains. The CII is instrumental in determining the indexed cost of acquisition, which, in turn, affects the taxable gains on the sale of real estate.
  5. Encouraging Investments: By adjusting for inflation, the CII encourages long-term investments by offering tax benefits on the actual gains, rather than gains inflated by the rise in the general price level.


Understanding the Cost Inflation Index is crucial for taxpayers, investors, and financial planners in India. It not only facilitates accurate tax calculations but also ensures fair treatment of capital gains by considering the impact of inflation. As the CII is subject to annual revisions, staying informed about the latest values is essential for making well-informed financial decisions.

Nikita Bhatia
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