A SIP that earns 12% annual returns but is taxed at 15% on long-term gains, held inside an ELSS fund that also qualifies for Section 80C deductions, has a meaningfully different effective return than the same 12% SIP in a non-tax-advantaged account — and most SIP calculators ignore this entirely
The previous articles on this site covered SIP basics, SIP vs lump sum evidence, tax-efficient investment wrappers (ISA/Roth IRA/ELSS), and step-up SIP's compounding advantage. This article addresses SIP stoppage and restart decisions — what happens to accumulated corpus when a SIP is paused, the cost of stopping SIP during market downturns (the most common mistake), and how to evaluate when stopping makes financial sense.
What happens to a SIP when you stop contributions
When a SIP is paused or stopped, existing units are not sold — the accumulated units remain invested in the fund and continue experiencing market movements (up or down). The only thing that stops is new unit purchases.
This is a crucial distinction: stopping a SIP is not the same as redeeming (selling) the investment. The existing corpus continues compounding based on NAV movements. Stopping contributions removes the "dollar cost averaging" benefit going forward, but doesn't undo the existing investment.
The compound growth continues on whatever corpus has been built — but without new contributions, the future corpus at a given date will be lower than it would have been with continued SIP, by approximately the future value of the missed contributions.
If a SIP is stopped at ₹3,00,000 corpus and the fund returns 12% p.a. for the next 10 years:
- Without any further contributions: ₹3,00,000 × 1.12^10 = ₹9,30,553
- With continued ₹5,000/month SIP for 10 years at 12%: corpus grows to approximately ₹20,48,000
The existing corpus grows in both cases — but the continued SIP more than doubles the outcome by adding new units at varying NAVs.
The market downturn SIP cessation mistake
The most damaging SIP timing mistake — and the most common — is stopping SIP during a market downturn. The psychological logic: "the market is falling, I'm losing money each month, I should stop until it recovers."
Why this is exactly backwards:
During a market downturn, NAV is lower — each ₹5,000 monthly SIP buys more units than during a bull market. The units purchased during the downturn are purchased cheapest, and they benefit most from the eventual recovery.
A concrete example: an investor who continued SIP during the 2008-2009 market crash and during the COVID-19 March 2020 crash outperformed an investor who stopped and restarted, because the bottom was precisely when units were most favorably priced.
The investor who stops during downturns:
- Avoids buying units during the fall (misses the cheap purchase)
- Typically restarts only after a significant recovery (buys units at higher NAV)
- Has lower corpus than the continuous investor, despite "avoiding losses"
The losses on existing units are identical — but the continuous investor accumulates more units at lower prices, while the stopped investor sits in cash or fixed deposits earning substantially less.
When stopping a SIP is financially rational
Despite the above, stopping a SIP is sometimes the correct decision:
Emergency fund depleted: if emergency expenses have depleted the liquid safety buffer and additional cash flow is needed, redirecting the SIP amount to rebuild the emergency fund temporarily is correct. An emergency fund is a prerequisite for long-term investing — SIP contributions without an emergency buffer create financial fragility.
High-interest debt acquired: if credit card debt or high-interest personal debt has been incurred (20%+ interest), directing the SIP amount to repay that debt first is mathematically rational. The guaranteed return from eliminating 20% interest debt exceeds expected equity SIP returns.
Near-term, certain financial need: if funds are needed within 1-2 years (a house purchase, education fees, medical procedure), equity SIP is the wrong vehicle — the timeline is too short to weather market volatility. Stopping equity SIP and redirecting to a shorter-duration, lower-risk vehicle (liquid fund, FD, short-term debt fund) is appropriate.
Redeeming during downturns: the irreversible mistake
Stopping SIP during a downturn is bad. Redeeming existing units during a downturn is worse — because it locks in the loss permanently. An unrealized loss (units whose current NAV is below purchase price) is paper; it reverses when markets recover. A realized loss (units sold at a loss) is final.
The distinction:
- Existing units during a downturn: paper loss, will recover with market (given sufficient time horizon)
- Redeemed units during a downturn: permanent loss crystallized; proceeds typically sit in a savings account earning 3-4% while missing the subsequent recovery
Long-horizon SIP investors (10+ year time horizon): historical data across all major equity markets shows no 10-year period in diversified equity where markets haven't recovered to previous highs and significantly exceeded them. The risk of permanent loss in diversified equity over a 10+ year horizon is much lower than investors perceive during downturns.
How to use the SIP Calculator on sadiqbd.com
- Model the cost of stopping: run the calculator for your current tenure remaining (if you stopped today) vs continued SIP — the difference in final corpus quantifies what the stoppage costs in absolute terms
- Step-up SIP planning: use the calculator with a slightly higher monthly amount than your current SIP to model what a 10% annual step-up would produce — this often reveals that small annual increases have compounding impact far larger than their absolute size suggests
- For ELSS SIPs specifically: apply the post-tax calculation mentally — 12% gross return with 15% LTCG on gains (above ₹1 lakh exempt annually) gives an effective post-tax return closer to 10.8% over a long horizon; run the calculator at 10.8% for the post-tax realistic figure
Frequently Asked Questions
Can I change my SIP amount without stopping and restarting it? With most platforms and fund houses, yes — through a "SIP modification" facility. You can typically increase or decrease the SIP amount, change the SIP date, or modify the tenure without stopping the SIP. Modifying a SIP preserves the investment history, the accumulated units, and (importantly) the original purchase date for LTCG tax purposes on earlier units. Stopping and restarting a SIP to change the amount is unnecessary on most platforms and resets the SIP record — check whether your platform supports modification before stopping.
Is the SIP Calculator free? Yes — completely free, no sign-up required.
Try the SIP Calculator free at sadiqbd.com — calculate SIP returns, maturity amount, and wealth gained for any monthly investment amount and tenure.
