What is indexation benefit and can collectors use it?
Indexation benefit adjusts the acquisition cost of a long-term capital asset upward to account for inflation, reducing the effective taxable gain. It is available for capital assets held for more than 24 months. Currency notes held as capital assets for over 24 months qualify. The adjustment uses the government's Cost Inflation Index (CII), notified annually. Indexation can substantially reduce the taxable gain — sometimes to zero or near-zero for notes held over many years in a high-inflation environment.
How indexation works
The indexed cost of acquisition is calculated as: Original cost × (CII of year of sale ÷ CII of year of acquisition). The Cost Inflation Index is published annually by the Central Board of Direct Taxes. It tracks cumulative inflation from a base year (currently FY 2001-02 = 100).
If a collector paid ₹2,000 for a note in FY 2015-16 (CII: 254) and sells it in FY 2025-26 (CII: approximately 363), the indexed cost is ₹2,000 × (363 ÷ 254) = ₹2,000 × 1.429 = ₹2,858. The taxable gain is calculated on the selling price minus ₹2,858 — not minus the original ₹2,000. The collector effectively gets credit for the inflation that occurred during the holding period.
For notes held over very long periods in a high-inflation environment, indexation can eliminate the taxable gain entirely. A note bought in 2001-02 for ₹500 held until 2025-26 would have an indexed cost of ₹500 × (363 ÷ 100) = ₹1,815. If the note sold for ₹1,500 — less than the indexed cost — there would be a long-term capital loss despite a nominal gain over the original purchase price.
The documentation requirement for indexation
Claiming indexation benefit requires establishing the year of acquisition. Without documentation of when the note was purchased, the collector cannot use the CII of the acquisition year. This is another critical reason why acquisition documentation matters — without it, the collector cannot access the indexation benefit that the law provides.
The year of acquisition is the financial year (April to March) in which the note was acquired. If a note was purchased on 5 March 2021, it was acquired in FY 2020-21 (CII: 301). If purchased on 5 April 2021, it was acquired in FY 2021-22 (CII: 317). The difference may seem small, but for large-value notes, even a one-year CII difference can affect the indexed cost meaningfully.
Indexation and the 20% rate
Long-term capital gains on personal property are taxed at 20% under Section 112 of the Income Tax Act, with indexation. The collector cannot choose to take the gain at 20% without indexation — for personal property (as distinct from listed securities), the 20% rate applies with indexation. This combined effect — reduced indexed gain taxed at 20% — is consistently more favourable than short-term slab-rate taxation for most collectors.
Laws & authorities referenced in this chapter
Income Tax Act 1961 — §48(ii) (indexed cost of acquisition using Cost Inflation Index)
Income Tax Act 1961 — §112 (tax on long-term capital gains at 20% with indexation)
Cost Inflation Index — notified annually by CBDT; base year FY 2001-02 = 100
Indexation adjusts acquisition cost upward for inflation using Cost Inflation Index. Available for assets held over 24 months. Formula: indexed cost = original cost × (CII of sale year ÷ CII of acquisition year). Can substantially reduce or eliminate taxable gain on long-held notes. Requires documentation of acquisition year — without it, CII benefit cannot be claimed. Long-term rate: 20% on indexed gain. Always better than slab rate for most collectors holding quality notes.
This is educational content, not legal advice. For a specific situation, please consult a qualified legal professional. Excerpted from Currency, Coins & The Law by Mayank Agarwal, Part 6: The Invisible Obligation.