The year 2001 serves as the "base year" for indexation. When you sell an old property, the 2001 rate helps you "reset" your purchase price to a higher 2001 value, which significantly reduces your taxable profit.

Shifting of Base Year from 1981 to 2001 for Capital Gains Tax Computation

: Income Tax Officers strictly verify that your claimed 2001 value does not surpass the government’s 2001 RR rates.

Since 2001 data is rarely available on the modern e-ASR (Annual Statement of Rates) portal , you generally have three options:

: The Cost Inflation Index (CII) uses 2001-02 as the starting point (Value = 100). Historical Rates for Key Mumbai Localities (2001 Estimates)