Lump sum vs SIP — the actual evidence
Academic studies (and Indian AMC back-tests over 20+ years of Nifty data) consistently show lump-sum modestly outperforms SIPs over horizons of 10+ years — because markets trend up more often than not, so getting invested faster wins on average. But the median outperformance is small, and the worst-case lump-sum (entering at a peak just before a crash) takes 5–7 years to recover, which most investors cannot stomach.
Per AMFI quarterly reports, lump-sum equity inflows are roughly 25–35% of total equity inflows — the rest comes via SIP. The math says lump-sum wins on average; behaviour says SIP wins in retention.
Use STP when valuations feel rich
A Systematic Transfer Plan (STP) parks your lump sum in a liquid or ultra-short debt fund and transfers a fixed amount each month into your target equity fund — typically over 6–12 months. You earn 6–7% on the parked balance (versus 3–4% in a savings account) and dilute timing risk.
Most AMCs allow STP setup at the time of investment with no charge. The cost is opportunity — if markets rip during your STP window, you participate less. For 80% of lump-sum investors, the lower-regret path is worth it.
Tax treatment of lump-sum returns
Equity-oriented funds (≥65% equity) attract 20% STCG if redeemed within 12 months and 12.5% LTCG above ₹1.25 L/year of gains after that. Debt funds, after the FY23-24 change, are taxed at slab rate on all gains regardless of holding period — so the old LTCG-with-indexation benefit on debt is gone.
For large lump sums, splitting across two financial years can preserve the LTCG exemption in both years — a ₹2.5 L gain split as ₹1.25 L this March and ₹1.25 L next April incurs zero LTCG.
How to deploy a windfall responsibly
If the amount is large (bonus, inheritance, RSU vest, ESOP exit, property sale), first carve out: an emergency fund (6 months of expenses in liquid), high-cost debt clearance (anything above 12% interest), term insurance if dependants and any tax planning for the year.
Only after these is the equity decision — and there, a 60/40 equity-hybrid split, deployed via a 9-month STP, is a reasonable default for most 7-year+ horizons.
What the lumpsum calculator assumes
The calculator uses annual compounding at a flat rate. It does not model: drawdowns, exit loads (typically 1% if redeemed within 365 days for equity funds), STT, or LTCG/STCG. For a horizon-matched scheme suggestion plus a personalised STP schedule, request a callback — our advisor will set this up at zero cost to you.