LTCG Grandfathering (31 Jan 2018): Exact Rule + Examples

The January 31, 2018 grandfathering provision in Section 112A is one of the most valuable -- and most misunderstood -- provisions in Indian capital gains tax law. Investors who bought equity before February 2018 and have not yet sold may be significantly overestimating their tax liability. This guide explains the exact rule, when it helps, when it doesn't, and how to apply it in practice.

What is LTCG Grandfathering?

When the government reintroduced LTCG tax on equity in Budget 2018 (it had been abolished in 2004), it created a grandfather clause to protect investors from being taxed on gains that had already accumulated over many years before the law changed.

The provision: for equity shares and equity mutual fund units purchased before February 1, 2018, the cost of acquisition for LTCG calculation is the higher of:

• Your actual purchase price (what you paid), OR
• The Fair Market Value (FMV) on January 31, 2018 (the last trading day before Budget 2018)

There is one cap: the deemed cost cannot exceed the actual selling price. Grandfathering reduces taxable gain, but it cannot convert a gain into a loss.

The Legal Basis

Section 112A(7)(a) of the Income Tax Act: "In case of a long-term capital asset being an equity share in a company or a unit of an equity oriented fund... acquired before the 1st day of February, 2018, the cost of acquisition shall be the higher of -- (i) the cost of acquisition of such asset; and (ii) the lower of -- (A) the fair market value of such asset; and (B) the full value of consideration received or accruing as a result of the transfer of the capital asset."

In plain English: deemed cost = max(actual cost, min(Jan 31 2018 FMV, selling price)). The "min(FMV, selling price)" part ensures grandfathering cannot create a loss.

When Grandfathering Helps: The Full Calculation

Grandfathering provides the maximum benefit when:

• You bought the stock at a low price before 2018
• The stock price rose significantly between your purchase date and January 31, 2018
• The stock has continued to appreciate since 2018

Example: Bought 200 shares of Bajaj Finance at ₹500 in 2016. Jan 31, 2018 FMV = ₹2,200. Current selling price (2026) = ₹7,000.

Scenario	Cost Used	Gain per Share	Total Gain (200 shares)	Taxable Gain
Without grandfathering	₹500 (actual)	₹6,500	₹13,00,000	₹13,00,000 - ₹1,25,000 = ₹11,75,000
With grandfathering	₹2,200 (FMV)	₹4,800	₹9,60,000	₹9,60,000 - ₹1,25,000 = ₹8,35,000
Tax saved	₹(11,75,000 - 8,35,000) x 12.5% x 1.04 = ₹44,200

When Grandfathering Does Not Help

Three situations where grandfathering makes no difference:

• Purchased after January 31, 2018: If you bought on February 1, 2018 or later, grandfathering does not apply at all. Your actual purchase price is the cost of acquisition.
• Actual purchase price is higher than Jan 31 2018 FMV: If you bought at ₹500 and the Jan 31 2018 FMV was ₹400 (stock had fallen), your actual cost of ₹500 is used. Grandfathering takes the higher value, and your actual purchase price is already higher.
• Selling below Jan 31 2018 FMV: If the Jan 31 2018 FMV was ₹1,000 but you are selling at ₹800, the cap applies -- deemed cost cannot exceed selling price. So deemed cost = ₹800, gain = ₹0. You have a notional zero gain (not a loss). Grandfathering prevents a paper gain on paper from becoming taxable when the actual economic gain is negative.

How to Find January 31, 2018 Prices

You need the "highest traded price" on January 31, 2018 for your specific stock. Steps to find it:

1. BSE Historical Data: bseindia.com - Market Data - Historical Data - Equity. Enter company name and date range January 31 2018 to January 31 2018. Download CSV. Use the "High" column.
2. NSE Historical Data: nseindia.com - Market Data - Historical Data. Same process. Use "High" price column.
3. For mutual funds: Use NAV on January 31, 2018. AMFI historical NAV data is at amfiindia.com - Research and Information - Historical NAV.

Both BSE and NSE are acceptable sources for ITR purposes. Document which source you used in case of scrutiny.

Grandfathering for Mutual Funds

The same provision applies to equity mutual fund units. For units purchased before February 1, 2018, the FMV on January 31, 2018 is the fund's NAV on that date.

For SIP investors: each instalment has its own purchase date. Units purchased through SIP installments paid before February 1, 2018 get the grandfathering benefit (using the respective Jan 31 2018 NAV). Units from SIP installments after that date do not.

Common Confusion Points

Confusion 1: "Grandfathering applies to all my Infosys shares bought in 2015."

Correct: Yes, but the FMV on Jan 31 2018 is used, not your purchase price. If you bought Infosys at ₹900 in 2015 and the Jan 31 2018 FMV was ₹1,160, your deemed cost is ₹1,160 per share -- not ₹900.

Confusion 2: "If I have a loss since Jan 31 2018, grandfathering creates a tax loss."

Incorrect. If you bought at ₹400, Jan 31 2018 FMV was ₹1,000, and you are selling at ₹800 -- you might expect a deemed loss of ₹200 (₹800 selling - ₹1,000 FMV). But the cap applies: deemed cost = min(₹1,000 FMV, ₹800 selling price) = ₹800. Gain = ₹0. No loss can be created by grandfathering.

Confusion 3: "The grandfathering rule changed in Budget 2024."

Incorrect. Budget 2024 changed the LTCG rate (from 10% to 12.5%) and exemption (from ₹1L to ₹1.25L), but did not change the grandfathering provision. It remains in force for pre-February 2018 purchases.

Using stoicHQ's Calculator for Grandfathering

Manually looking up historical prices and running the grandfathering calculation is tedious, especially for investors with multiple pre-2018 purchases across many stocks. stoicHQ's LTCG Calculator at stoichq.in/tools/ltcg-calculator-india includes a grandfathering module -- enter your purchase date (before Feb 2018), purchase price, and sale price, and the calculator automatically applies the higher-of rule and caps.