You Started a 12-Month SIP. You Redeemed in Month 13. You Expected 12.5% LTCG Tax. You Got 20% STCG on 91.7% of Your Investment.
Every SIP article explains rupee cost averaging. None of them explain the tax time bomb hiding inside your SIP.
When you redeem mutual fund units purchased via SIP, each monthly installment is treated as a separate purchase with its own 12-month holding period. This means a “13-month-old SIP” is actually 12 different purchases — only one of which is old enough for LTCG treatment.
The result: you expect 12.5% tax. You get 20% tax on almost everything. The difference on a Rs 5 lakh SIP with Rs 60,000 gains: Rs 3,600 extra tax that nobody warned you about.
How SIP Taxation Actually Works
Each Installment = Separate Purchase
When you set up a Rs 10,000 monthly SIP in an equity fund, every month creates a new “lot” of units with its own:
- Purchase date
- Purchase NAV
- Number of units
- Holding period countdown
Your fund house tracks these lots. When you redeem, units are sold in FIFO order (First In, First Out) — your oldest units sell first.
The 12-Month Holding Period Applies Per Installment
For equity and equity-oriented hybrid mutual funds, units held for more than 12 months qualify for LTCG (12.5% tax). Units held for 12 months or less are STCG (20% tax).
This seems straightforward until you realize what it means for SIP redemptions.
The Month-by-Month Tax Calendar
12-Month SIP: Rs 10,000/Month Started January 2025
If you redeem the entire holding on a given date, here is how many installments qualify for LTCG:
| Redemption Date | Months Since 1st SIP | Installments with LTCG | Installments with STCG | % Taxed at 12.5% | % Taxed at 20% |
|---|---|---|---|---|---|
| Jan 2026 | 12 | 0 | 12 | 0% | 100% |
| Feb 2026 | 13 | 1 | 11 | 8.3% | 91.7% |
| Mar 2026 | 14 | 2 | 10 | 16.7% | 83.3% |
| Apr 2026 | 15 | 3 | 9 | 25% | 75% |
| Jul 2026 | 18 | 6 | 6 | 50% | 50% |
| Oct 2026 | 21 | 9 | 3 | 75% | 25% |
| Dec 2026 | 23 | 11 | 1 | 91.7% | 8.3% |
| Jan 2027 | 24 | 12 | 0 | 100% | 0% |
The 24-month rule: For a completed 12-month SIP, you need to wait 24 months from the first installment for 100% LTCG treatment. Redeeming even one month early costs you STCG on the last installment.
The Tax Impact in Rupees
Scenario: Rs 10,000/Month SIP for 12 Months, Total Rs 1.2 Lakh, Redeemed at Rs 1.44 Lakh (20% Overall Return)
Total gain: Rs 24,000. Let us assume the gain is distributed proportionally across installments (Rs 2,000 per installment for simplicity).
| Redemption Timing | LTCG Portion | LTCG Tax (12.5%) | STCG Portion | STCG Tax (20%) | Total Tax |
|---|---|---|---|---|---|
| Month 13 (Feb 2026) | Rs 2,000 | Rs 0 (under exemption) | Rs 22,000 | Rs 4,400 | Rs 4,400 |
| Month 18 (Jul 2026) | Rs 12,000 | Rs 0 (under exemption) | Rs 12,000 | Rs 2,400 | Rs 2,400 |
| Month 24 (Jan 2027) | Rs 24,000 | Rs 0 (under exemption) | Rs 0 | Rs 0 | Rs 0 |
Waiting from month 13 to month 24 saves Rs 4,400 on a Rs 24,000 gain. That is an 18.3% tax saved by simply waiting 11 months.
Larger SIP: Rs 50,000/Month for 12 Months, 20% Return
Total invested: Rs 6 lakh. Total value: Rs 7.2 lakh. Gain: Rs 1.2 lakh.
| Redemption Timing | LTCG Tax | STCG Tax | Total Tax | Tax Saved vs Month 13 |
|---|---|---|---|---|
| Month 13 | Rs 0 | Rs 22,000 | Rs 22,000 | — |
| Month 18 | Rs 0 | Rs 12,000 | Rs 12,000 | Rs 10,000 |
| Month 24 | Rs 0 | Rs 0 | Rs 0 | Rs 22,000 |
On a Rs 6 lakh SIP, the 24-month wait saves Rs 22,000 in tax. The Rs 1.25 lakh annual LTCG exemption absorbs the entire gain at LTCG rates.
Large SIP: Rs 1 Lakh/Month for 12 Months, 20% Return
Total invested: Rs 12 lakh. Total value: Rs 14.4 lakh. Gain: Rs 2.4 lakh.
| Redemption Timing | LTCG Tax (12.5% above Rs 1.25L exemption) | STCG Tax (20%) | Total Tax |
|---|---|---|---|
| Month 13 | Rs 0 | Rs 44,000 | Rs 44,000 |
| Month 18 | Rs 0 | Rs 24,000 | Rs 24,000 |
| Month 24 | Rs 14,375 (on Rs 1.15L above exemption) | Rs 0 | Rs 14,375 |
Even with a gain exceeding the Rs 1.25 lakh exemption, waiting until month 24 saves Rs 29,625 — a 67% reduction in tax versus redeeming in month 13.
Ongoing SIPs — The Perpetual Tax Calendar
If your SIP is still running (not completed), the tax picture is different because new units keep getting added.
Rule for Ongoing SIPs
At any point in time, your SIP portfolio contains:
- Long-term units: Installments from more than 12 months ago
- Short-term units: Installments from the last 12 months
If you have been running a Rs 10,000/month SIP for 3 years (36 installments):
- 24 installments are long-term (month 1 through 24)
- 12 installments are short-term (month 25 through 36)
- 67% of your units get LTCG, 33% get STCG
For a 5-year running SIP (60 installments):
- 48 long-term, 12 short-term
- 80% LTCG, 20% STCG
For a 10-year running SIP (120 installments):
- 108 long-term, 12 short-term
- 90% LTCG, 10% STCG
The longer your SIP runs, the smaller the STCG share becomes. After 5+ years, the tax impact of the last 12 months of installments becomes marginal relative to the total.
Strategic Redemption — How to Minimize Tax
Strategy 1: Partial Redemption — Take Only Long-Term Units
If you need Rs 2 lakh from a 3-year SIP, you do not have to redeem everything. FIFO ensures your oldest (long-term) units sell first. If your long-term units are worth more than Rs 2 lakh, your entire redemption gets LTCG treatment.
Check your fund statement for the purchase date of each SIP tranche. Most apps (Groww, Kuvera, Coin) show unit-wise details.
Strategy 2: Staggered Redemptions Across Financial Years
The Rs 1.25 lakh LTCG exemption resets every April 1. If your total LTCG across equity investments is close to this limit:
| Financial Year | Redeem LTCG Up To | Tax |
|---|---|---|
| FY 2025-26 | Rs 1.25 lakh | Rs 0 |
| FY 2026-27 | Rs 1.25 lakh | Rs 0 |
| FY 2027-28 | Rs 1.25 lakh | Rs 0 |
Over 3 years, you can harvest Rs 3.75 lakh in equity gains completely tax-free. A couple doing this separately shelters Rs 7.5 lakh over 3 years.
Strategy 3: Stop SIP 12 Months Before Goal Date
If you know you will need the money in January 2028, stop adding new SIP installments by January 2027. This ensures all existing units cross the 12-month threshold by your target date.
Your existing SIP continues to grow through NAV appreciation — you are only stopping new purchases. This is not the same as redeeming early.
Strategy 4: SWP After 24 Months
A Systematic Withdrawal Plan (SWP) redeems a fixed amount monthly. If started after all SIP units are long-term (24 months from first installment for a 12-month SIP), every SWP withdrawal gets LTCG treatment.
SWP from an equity fund after 12+ months holding:
- 12.5% LTCG on gains
- Rs 1.25 lakh annual exemption applies
- For a Rs 20 lakh corpus generating 12% returns, an SWP of Rs 15,000/month has a gain component of roughly Rs 3,000-4,000/month (Rs 36,000-48,000/year) — well within the exemption limit
ELSS Exception — The Lock-In Eliminates the Trap
ELSS (Equity Linked Savings Scheme) funds have a mandatory 3-year lock-in per installment. Since LTCG requires only 12 months, every ELSS unit automatically qualifies for LTCG by the time you can access it.
| ELSS SIP Installment | Lock-In Ends | Holding Period | Tax Treatment |
|---|---|---|---|
| Jan 2025 | Jan 2028 | 36 months | LTCG (12.5%) |
| Feb 2025 | Feb 2028 | 36 months | LTCG (12.5%) |
| Dec 2025 | Dec 2028 | 36 months | LTCG (12.5%) |
The SIP tax trap is irrelevant for ELSS investors. All gains are LTCG with the Rs 1.25 lakh exemption.
Debt Mutual Fund SIPs — No Trap, No Benefit
For debt mutual funds purchased after April 1, 2023, all gains are taxed at your income slab rate regardless of holding period. There is no LTCG threshold to optimize around.
| Holding Period | Tax Rate |
|---|---|
| 1 month | Slab rate (up to 31.2%) |
| 6 months | Slab rate |
| 12 months | Slab rate |
| 36 months | Slab rate |
| 60 months | Still slab rate |
The SIP FIFO rules still apply for calculating gains, but since the tax rate is the same regardless of holding period, the timing of redemption has no tax impact. Redeem whenever your financial goal requires it.
Crypto SIPs — Flat Rate Eliminates the Trap
Crypto is taxed at 31.2% flat regardless of holding period. Whether you hold for 1 day or 5 years, the rate does not change. The SIP tax trap — where different installments get different tax treatment — does not exist for crypto.
However, each crypto SIP purchase triggers 1% TDS under Section 194S, incrementally locking up capital. On a Rs 10,000/month crypto SIP, Rs 100/month is locked in TDS until your ITR is processed — a small but compounding drag on tradeable capital.
Quick Reference: When to Redeem Your SIP
| Your SIP Duration | Wait Until This Month for 100% LTCG | Minimum for Any LTCG |
|---|---|---|
| 6-month completed SIP | Month 18 from start | Month 13 from start |
| 12-month completed SIP | Month 24 from start | Month 13 from start |
| 24-month completed SIP | Month 36 from start | Month 13 from start |
| Ongoing SIP (any duration) | 12 months after stopping new installments | Always partial LTCG if SIP >12 months old |
The bottom line: for equity mutual funds, the date you start your SIP matters less than the date you stop it. Stop adding installments at least 12 months before you plan to withdraw, and your entire corpus qualifies for the lower 12.5% LTCG rate with the Rs 1.25 lakh exemption.
For a complete breakdown of what a Rs 5,000/month SIP actually produces in real funds over 10, 15, and 20 years — including inflation-adjusted projections and the step-up SIP math — read The Rs 5,000/month SIP Plan: What You’ll Have in 10, 15, 20 Years.
This article is for educational purposes only. Tax rules reflect FY 2025-26 provisions. Consult a qualified CA for advice specific to your situation.
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