How Capital Gains Are Calculated
What is it?
A capital gain is the profit you make when you sell (redeem) mutual fund units for more than you paid for them. It's calculated as the redemption value minus the purchase cost (also called the cost of acquisition), and this gain — not your total redemption amount — is what gets taxed.
Why should you care?
Many new investors mistakenly assume tax applies to the entire amount they receive when redeeming, causing unnecessary worry, or conversely assume no tax applies until they've withdrawn all their money, missing that each redemption is a separate taxable event calculated on its own gain.
Real-life example
Suppose you invested ₹1,00,000 in a mutual fund and later redeemed those units for ₹1,40,000. Your capital gain is ₹40,000 (₹1,40,000 − ₹1,00,000) — only this ₹40,000 is subject to capital gains tax, not the full ₹1,40,000 you received. If you had invested via SIP across multiple months, each instalment is treated as a separate purchase with its own date and cost, so a single redemption can include units bought at different times, each calculated separately for gains.
Common mistakes
- Assuming the entire redemption amount is taxable, rather than just the gain portion above your original cost.
- Forgetting that each SIP instalment has its own purchase date, which matters for determining whether that specific tranche of units qualifies for long-term or short-term treatment.
- Not keeping track of purchase costs and dates, making it harder to calculate gains accurately at redemption time (though your Consolidated Account Statement records this for you).
How a capital gain is calculated (illustrative)
| Item | Amount |
|---|---|
| Purchase cost (cost of acquisition) | ₹1,00,000 |
| Redemption value | ₹1,40,000 |
| Capital gain (taxable amount) | ₹40,000 |
FAQ
Is tax deducted automatically when I redeem?
For most resident Indian investors, mutual funds don't deduct TDS on capital gains from equity or debt fund redemptions — you're responsible for calculating and paying the applicable tax when filing your income tax return. (NRIs are subject to TDS rules, which differ.)
Where can I find my purchase cost and dates for tax calculation?
Your Consolidated Account Statement (CAS) from CAMS/KFintech lists every transaction with its date and amount, which is the standard source used to calculate capital gains — FundSageAI's CAS tools can also help organise this.
Does the tax rate depend on how long I held the units?
Yes — mutual fund capital gains are classified as either long-term (LTCG) or short-term (STCG) depending on the holding period, and each is taxed differently; see LTCG vs STCG on Mutual Funds for the full breakdown.
Does switching between funds within the same AMC count as a sale for tax purposes?
Yes — switching from one scheme to another (even within the same fund house) is treated as a redemption of the first scheme and a fresh purchase of the second, meaning capital gains tax applies on the switch, not just on a withdrawal to your bank account.
See this concept applied to your own portfolio
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