SIP Returns After LTCG Tax:
What You Actually Take Home

Every SIP calculator gives you a number. That number is wrong, not because the math is off, but because it is the wrong number to plan your life around. The gross corpus before taxes, fees, and inflation is an illusion. This guide shows you the real number, and more importantly, how to maximise it.

1. Current LTCG Tax Rules for Equity Mutual Funds (2025-26)

Budget 2024 changed equity mutual fund taxation in two ways: the LTCG rate rose from 10% to 12.5%, and the annual exemption increased from ₹1 lakh to ₹1.25 lakh. Here's the current framework:

Budget 2026 confirmed no changes to these rates , the current framework (STCG 20%, LTCG 12.5%, ₹1.25L exemption) is stable for FY 2026-27. Budget 2024 was the inflection point: STCG rose from 15% to 20%, LTCG rose from 10% to 12.5%, but the exemption also rose from ₹1L to ₹1.25L. The net effect: investors with annual equity gains below ₹2.25L actually pay less tax under the new system (the higher exemption outweighs the higher rate). Above ₹2.25L annual gains, the new rates cost more. For a ₹10,000/month SIP investor, the practical LTCG impact typically starts becoming significant only after 7-8 years of investment, when cumulative gains begin exceeding the ₹1.25L annual threshold. The capital gains tax guide covers the full rate framework across all asset classes. Budget 2026 also retained the Section 87A rebate exclusion for capital gains , LTCG and STCG cannot be offset by the 87A rebate even if total income is under ₹12L.

2. The Real Number: ₹10,000/Month SIP Fully Worked Out

Let's run the standard benchmark scenario and calculate the full post-tax result.

Inputs: ₹10,000/month SIP, 20 years, 12% expected CAGR, equity mutual fund (direct plan).

The worked example is the most important section of this guide. Most SIP investors have never seen their exact post-tax outcome calculated. Here is the complete calculation for ₹10,000/month SIP in a Nifty 50 index fund over 10 years at 12% CAGR. Gross corpus at 10 years: approximately ₹23.23 lakh. Total invested: ₹12 lakh. Gross gain: ₹11.23 lakh. Tax calculation (FIFO method, LTCG at 12.5% on gains above ₹1.25L per year , assuming gains are spread over multiple financial years through annual harvest): if all units are redeemed at once in Year 10, approximately ₹10 lakh of gains are LTCG (12-month+ instalments) and ₹1.23 lakh is STCG (last 12 months). LTCG taxable (after ₹1.25L exemption): ₹8.75 lakh at 12.5% = ₹1.09L tax. STCG: ₹1.23L at 20% = ₹24,600 tax. Total tax: approximately ₹1.33L. Post-tax corpus: ₹21.9L. The "real" post-tax CAGR on your ₹12L invested: approximately 10.75% vs the pre-tax 12% CAGR. Tax costs you 1.25% annually in this scenario , but this is the worst case (single lump redemption). With annual LTCG harvesting, the tax cost drops significantly because you use the ₹1.25L exemption every year. Use the Mutual Fund Tax Calculator to compute your specific instalment breakdown.

3. The FIFO Method: How Your SIP Units Are Actually Taxed

Most articles explain the LTCG rate correctly but skip the FIFO detail, which is where SIP taxation gets complex. FIFO (First In, First Out) means when you redeem SIP units, the income tax rules treat the oldest units as sold first.

Each SIP installment has its own purchase date. The 12-month LTCG clock starts from the date of each installment, not from when you started the SIP.

Practical implication: If you redeem a large lump sum from a running SIP, some units will attract STCG at 20% (the most recently purchased ones) while older units attract LTCG at 12.5%. The FIFO method ensures the oldest (cheapest cost-basis, highest gain) units are sold first, which is actually beneficial since those units also qualify for LTCG treatment.

For long-running SIPs (5+ years), by the time you redeem, the vast majority of units are LTCG-eligible because the SIP has been running well beyond 12 months for most installments. The STCG exposure is limited to approximately the last 12 months of installments.

The FIFO (First In First Out) rule creates the most counter-intuitive SIP tax outcome: a long-running SIP investor who redeems a small portion of their corpus triggers tax on their oldest , and typically best-performing , units first. Example: 5-year SIP, ₹10,000/month, you want to redeem ₹50,000. Under FIFO, the 60 units from Month 1 (purchased 5 years ago at a much lower NAV) are redeemed first. These units have the largest gain , and the largest LTCG. The recent units (Month 58, 59, 60) which cost nearly today's NAV are NOT redeemed. The implication: partial redemptions from long-running SIPs generate proportionally more LTCG than a pro-rata redemption would , because the oldest, most-appreciated units go first. This is actually favourable for LTCG (rather than STCG) but it means a larger gain is taxed per rupee redeemed. Strategy to manage FIFO: for investors doing the annual harvest strategy, redeem close to March 31 so the maximum number of instalments are 12+ months old (LTCG). For investors planning early partial redemption: redeem only after the first instalment turns 12 months old (to get LTCG treatment on at least the first units). For a SIP running over 3 years: by the time you do an annual harvest, the units are all 12+ months old , the entire redemption is LTCG, maximising the ₹1.25L exemption utilisation. The Mutual Fund Tax Calculator applies FIFO automatically when you enter your SIP start date and redemption date.

4. The Triple Erosion: Tax + Expense Ratio + Inflation

LTCG tax is one of three forces eroding your SIP corpus. The triple erosion framework shows the full picture: what the calculator shows versus what you can actually spend.

The post-inflation real value is the most sobering number. ₹90 lakh in 20 years is equivalent to approximately ₹28 lakh in today's purchasing power at 6% inflation , about 3× your invested principal in real terms. SIPs still build wealth significantly, but the gross corpus is not the right number to plan your retirement or goals around.

For a complete real-return calculation on any investment, use our real return calculator , it adjusts for inflation and lets you see the purchasing-power-equivalent of any future corpus in today's rupees.

Each erosion layer compounds , the combination of expense ratio, LTCG tax, and inflation shrinks the apparent 12% CAGR to approximately 5% real post-tax. But this comparison still dramatically beats FD: FD at 7% nominal, 31.2% tax, 6% inflation = approximately 2.3% real post-tax CAGR. Equity SIP at 12% nominal, 0.5% expense ratio, 12.5% LTCG, 6% inflation = approximately 5.0% real post-tax CAGR. The equity SIP's real post-tax advantage is 2.7% per year , compounding significantly over 20+ years. The why 7% is not enough guide models why FD returns consistently fail to build real wealth and the Real Return Calculator applies all three erosion layers to any return rate you enter.

5. Post-Tax SIP Corpus at 5 Investment Amounts

The same tax logic applied across common SIP amounts over a 20-year horizon at 12% CAGR, showing the gap between the "headline number" and post-LTCG corpus.

*Assumes lump-sum redemption at maturity using one FY's ₹1.25L exemption. Tax calculated on (Total Gains − ₹1.25L) × 12.5%. Actual tax will be lower with annual harvest strategy. All values rounded to nearest ₹10,000.

Notice that LTCG tax consistently eats approximately 9.3–9.5% of the gross corpus across all investment amounts. This is a predictable drag you can plan for , and partially offset through the strategies below. If you're increasing your monthly SIP amount every year, the gap grows proportionally , model it with the Step-Up SIP Calculator.

The post-tax corpus is approximately 5.7% lower than gross corpus in the lump-redemption scenario. But notice: as SIP amount grows, the absolute tax saved through annual harvesting becomes larger. For the ₹1L/month SIP investor, disciplined annual harvesting (redeeming and reinvesting ₹1.25L of gains each March) saves approximately ₹8-12L in LTCG tax over 10 years compared to lump redemption. The harvest strategy is disproportionately valuable for higher SIP amounts. Use the Step-Up SIP Calculator to project your corpus with annual SIP increases, then the Mutual Fund Tax Calculator for the post-tax figure.

6. The STCG Penalty: What You Lose by Exiting Before 12 Months

Redeeming before completing 12 months from the last installment triggers STCG at 20% on those units instead of LTCG at 12.5%. The penalty reflects the "tax-cost" of poor redemption timing. You can model your exact liability using our Mutual Fund Tax Calculator.

*Assuming ₹1.25L exemption was available for the LTCG comparison. All tax figures include 4% Health & Education Cess. On a ₹50,000/month SIP, exiting 12 months early creates a penalty of approximately ₹3,156 in avoidable taxes.

The message is clear: waiting the final 12 months matters , especially for the last year of large SIPs. If you're approaching a redemption goal, plan your timeline to ensure all installments have completed 12 months before redemption.

The STCG penalty is precisely quantifiable and severely underestimated by most SIP investors. On the same ₹10,000/month SIP at 12% CAGR, if you redeem after exactly 13 months (1 month past the 12-month threshold for the first instalment): the first month's instalment is LTCG , low tax. Months 2-13 are still STCG , all taxed at 20%. The naive investor who thinks "I've been investing for 13 months so it's all long-term" is wrong. Only the first instalment qualifies as LTCG. The remaining 12 instalments (11 months old through 1 month old) are STCG. This STCG on recent instalments is the most common and most costly SIP tax planning error. For a ₹10,000/month SIP: if you redeem at 13 months, approximately ₹10,000 of gain is LTCG (first instalment, gain on ~₹11,200 investment) and approximately ₹5,800 of gain is STCG (remaining 12 instalments). STCG tax at 20%: ₹1,160. LTCG tax: ₹0 (within ₹1.25L). Total tax: ₹1,160. If you had waited until 24 months before redeeming, all instalments would be LTCG , reducing tax to ₹0 (within ₹1.25L at this corpus size). The penalty for impatience: ₹1,160 on a ₹1.38L corpus , 0.84% taken by tax for not waiting 11 more months. The Mutual Fund Tax Calculator shows the exact per-instalment LTCG/STCG breakdown for any specific redemption date you enter.

7. Annual ₹1.25L LTCG Harvest Strategy

The single most effective legal tax reduction strategy for SIP investors, it is almost universally underutilised. The ₹1.25 lakh LTCG exemption resets every financial year. Most investors use it only once at the time of final redemption. Smart investors use it every year.

*Annual harvest tax is lower because the cost basis resets each year, reducing the taxable gain at final maturity. Exact saving depends on when harvests occur and NAV at each harvest point.

The harvest requires two things to be effective: first, you must have 12+ months of SIP instalments (no STCG on the harvested units). Second, you must track aggregate LTCG from all equity sources , if your equity portfolio already has ₹80,000 LTCG from stocks, only ₹45,000 remains of the arbitrage or MF exemption. Most investors who run the harvest strategy lose track of this aggregate, accidentally generating taxable LTCG above ₹1.25L when they could have split the redemption across two financial years. The harvest is not just for large investors: a ₹5,000/month SIP investor builds approximately ₹7,000-8,000 in gains after 12 months. Redeeming ₹7,500 of units and reinvesting uses ₹7,500 of the ₹1.25L exemption. Repeated annually for 10 years, this strategy saves approximately ₹8,000-12,000 in cumulative LTCG tax on a modest ₹5,000/month SIP , meaningful without requiring a high SIP amount.

8. ELSS vs Equity SIP vs FD: Post-Tax Real Return Comparison

For the same ₹1,50,000 invested annually (₹12,500/month), here's how the three main options compare on post-tax real returns over a 10-year horizon:

*Regular plan assumed 1.5% higher expense ratio reducing gross return to 10.5%. Post-tax corpus calculated as gross corpus less LTCG tax (12.5% on gains above ₹1.25L). ELSS and Direct SIP have identical returns and equal post-tax corpus , ELSS wins solely through the 80C deduction. Tax savings under 80C calculated at 30.9% (30% + 4% cess). ELSS 80C saving on ₹1.5L = ₹46,350/yr.

The conclusion is nuanced. ELSS and direct equity SIPs produce an identical corpus , ELSS wins only because of the Section 80C deduction. Once your 80C limit is exhausted (EPF, PPF, insurance), a direct equity SIP is equally efficient. Both crush an FD on post-tax real returns. Not sure which tax bracket you're in? Use the Income Tax Calculator to find your slab and the exact 80C saving ELSS delivers for you.

The ELSS advantage is structural and not just about tax savings on entry. ELSS 3-year lock-in guarantees that every SIP instalment becomes LTCG , there is no STCG ever possible on an ELSS redemption, because you cannot redeem before 3 years (which guarantees the 12-month threshold is always cleared). For equity SIP in regular funds, investors who need money in month 11 face STCG; ELSS investors cannot access the money to make that mistake. The forced lock-in is the psychological and mechanical solution to the STCG penalty. The tax math: ELSS in old regime provides 30% upfront tax saving on ₹1.5L (saves ₹45,000-₹46,800) plus LTCG at 12.5% (instead of STCG at 20%) on exit. This makes ELSS effectively produce returns of 14-15% equivalent post-tax on the ₹1.5L invested under 80C, even if the underlying fund returns only 12%. For new regime investors: 80C deduction is unavailable, ELSS loses its entry-tax advantage but retains the forced LTCG (no STCG) benefit and the discipline of lock-in. The comparison shifts: ELSS vs direct index fund SIP , both produce LTCG over 12 months with discipline; ELSS forces it mechanically. For growth, a well-chosen index fund may outperform an actively managed ELSS over 10+ years. Use the Mutual Fund Tax Calculator and the Income Tax Calculator with 80C deduction entered to model the full ELSS advantage including entry-point tax saving.

9. The Debt Fund Taxation Trap: Post April 2023

This is the most consequential change in mutual fund taxation in a decade, and it is still not widely understood by investors who started before 2023.

The April 2023 debt fund change is the most consequential underreported tax rule for conservative investors. Before April 2023: debt mutual fund held for 36+ months qualified for LTCG with indexation , typically near-zero effective tax because inflation adjustments consumed most gains. After April 2023: any debt fund unit purchased on or after April 1, 2023 is taxed at slab rate regardless of holding period. The indexation benefit is gone. At 30% slab: a 7% debt fund now nets 4.82% post-tax , identical to an FD at the same rate. The supposed advantage of debt MF over FD (LTCG with indexation) has disappeared for new purchases. The exception: units purchased before April 1, 2023 retain the old LTCG-with-indexation treatment. Investors with legacy debt fund holdings from before the rule change should evaluate carefully before redeeming , the tax-efficient treatment still applies to those specific units. The practical implication for SIP investors: if you were running a debt fund SIP for an "emergency fund" or "goal-based" allocation, every instalment from April 2023 onwards is now taxed at slab rate. Switch the emergency fund allocation to arbitrage fund (equity classification, LTCG after 12 months) for the tax-efficiency that debt funds no longer provide. The arbitrage fund vs FD guide covers this alternative in full. Use the Mutual Fund Tax Calculator to calculate actual post-tax returns on your specific debt fund holdings at your tax bracket.

10. FY-Boundary Redemption Timing Strategy

If you plan to redeem a large SIP corpus and the total gains will significantly exceed ₹1.25L, a simple timing strategy can save a full year's worth of additional LTCG exemption.

The strategy: Split a large planned redemption across the financial year boundary. Redeem a portion in March (end of FY1) and the balance in April (start of FY2). Each part uses its own financial year's ₹1.25L exemption.

₹15,625 saved from a single timing decision. For a ₹50L+ corpus with ₹30–40L in gains, the FY-boundary split can save ₹15,000–₹20,000 with no additional effort beyond choosing your redemption date carefully.

The fiscal year boundary strategy is simple but powerful: always target redemptions before March 31 for the current year's LTCG exemption, and if planning large redemptions, split across two financial years to utilize two years' worth of ₹1.25L exemption. Example: ₹2.5L LTCG redemption planned in March 2026. Option A , single redemption in March 2026: LTCG above ₹1.25L = ₹1.25L taxed at 12.5% = ₹15,625 tax. Option B , split redemption: ₹1.25L in March 2026 (last week of FY 2025-26) + ₹1.25L in April 2026 (first week of FY 2026-27). Tax in FY 2025-26 on ₹1.25L = ₹0 (fully within exemption). Tax in FY 2026-27 on ₹1.25L = ₹0 (new year's fresh exemption). Total tax saved: ₹15,625. This split-year strategy works for any planned redemption above ₹1.25L. The key requirement: the second redemption must be in a new financial year (April 1 or later), and the LTCG from other equity assets in that year must not have already consumed the ₹1.25L exemption. Track aggregate LTCG from all equity sources , stocks, equity MFs, arbitrage funds , using the Capital Gains Calculator to see remaining exemption headroom before each redemption. The Mutual Fund Tax Calculator models both redemption timing scenarios to show the exact tax difference.

11. The Switch Trap , Why Changing Funds Triggers Immediate Tax

One of the most frequently misunderstood aspects of SIP taxation: switching between mutual funds is treated as a redemption followed by a fresh purchase. Tax is triggered on the switch date, on all units being switched, regardless of the purpose. Common scenarios where investors accidentally trigger tax: switching from a regular plan to a direct plan of the same fund (different scheme codes = redemption), switching from Growth to IDCW option within the same fund, switching from one AMC's fund to another's, moving from a large-cap fund to a flexi-cap fund as market outlook changes. In every case, LTCG or STCG tax is triggered on the original units on the date of switch , even though from the investor's perspective they feel like they are "just repositioning."

The switch timing strategy: if you must switch funds, do it in a financial year where your aggregate equity LTCG will stay under the ₹1.25L exemption. If you have accumulated ₹3L+ in unrealised LTCG, switching triggers tax on the full gain , the exemption only covers ₹1.25L. Time major fund switches in April-May (start of financial year) so the triggered LTCG falls in the new year's exemption budget. The most tax-efficient repositioning: use new SIP instalments to increase allocation to the new fund while letting existing units in the old fund continue to compound and age past 12 months before any redemption. The Mutual Fund Tax Calculator models the tax impact of a planned switch against the tax cost of staying invested in the original fund.

12. IDCW vs Growth Option , The Hidden Tax in Dividend Plans

The IDCW (Income Distribution cum capital Withdrawal) option , formerly called Dividend plan , is one of the most tax-inefficient choices for investors in the 20%+ tax bracket. Every IDCW payout is added to total income and taxed at your slab rate. At the 30% slab: ₹10,000 IDCW received means ₹3,120 paid as tax (30% + 4% cess). The fund house also deducts 10% TDS if IDCW from a single fund exceeds ₹5,000 in a year , you then reconcile via ITR. Compare to Growth option: the same ₹10,000 that would have been paid as IDCW instead stays in the NAV, compounding at the fund's return. When you eventually redeem after 12+ months, it qualifies as LTCG and is taxed at 12.5% (after ₹1.25L exemption). At 30% slab, the tax cost on IDCW (31.2%) vs LTCG Growth (12.5%) is a 18.7 percentage point difference per rupee of distribution. The IDCW option made mathematical sense only before 2020, when dividends were tax-free to investors (the fund paid Dividend Distribution Tax). Since Finance Act 2020 eliminated DDT and made dividends taxable in investors' hands, the Growth option dominates for any investor in the 20%+ bracket. There is one exception: investors with zero or 5% effective tax rate (usually retirees on pension-only income below ₹5L) where IDCW tax rate equals or is lower than LTCG rate. For all others: always choose Growth. The LTCG mutual fund guide covers the Growth vs IDCW comparison in detail across all fund types.

13. What ₹10,000/Month SIP Looks Like Across 5, 10, 15, and 20 Years

The tax impact as a share of corpus grows with time , not because the tax rate changes, but because gains compound faster than invested capital, increasing the proportion of corpus that is unrealised gain. At 5 years: gains are 26.5% of corpus (tax impact small). At 20 years: gains are 76% of corpus (tax impact significant). This is why the LTCG harvest strategy becomes increasingly important the longer you stay invested. For a 20-year SIP, systematic annual harvesting saves approximately ₹8-15L in LTCG tax compared to lump-sum redemption. The SIP vs lumpsum guide compares the accumulation strategies; the post-tax outcome of each is modelled in the Mutual Fund Tax Calculator.

14. The Annual SIP Tax Optimisation Checklist

Five actions every SIP investor should take every financial year before March 31 to minimise LTCG tax burden: Action 1 , Check aggregate LTCG across all equity holdings (stocks + equity MF + ELSS + arbitrage funds). If remaining exemption headroom exists under ₹1.25L, book those gains now by redeeming and reinvesting. This resets your cost basis at a higher NAV, reducing future taxable gain. Action 2 , Review which SIP instalments cross the 12-month mark before March 31. Instalments from March of the prior year now qualify as LTCG. If a partial redemption is needed, target these instalments specifically (they get the lower LTCG rate instead of STCG). Action 3 , Offset capital losses from other instruments against LTCG. STCL can offset both STCG and LTCG; LTCL offsets only LTCG. File ITR even in loss years to carry forward losses for 8 years. Action 4 , Compare tax outcomes of redeeming now vs. waiting for April 1 (new financial year, fresh ₹1.25L exemption). For planned redemptions above ₹1.25L, split-year redemption saves tax at 12.5% on the excess. Action 5 , Verify tax regime choice. New regime has no 80C benefit (no ELSS deduction), but employer NPS contribution deduction under 80CCD(2) remains available. If switching regimes, do it from the next financial year , current year commitments still apply. Use the Income Tax Calculator with capital gains entered to verify total tax impact, the Capital Gains Calculator for remaining LTCG headroom, and the Mutual Fund Tax Calculator for per-instalment STCG/LTCG calculation before any SIP redemption.