Question 1

Is lumpsum or SIP actually better?

Accepted Answer

Neither wins in every scenario — it depends on the return path the market actually takes. If prices rise fairly steadily over the period, a lumpsum invested on day one has more time in the market and usually ends up ahead. If the market is volatile or falls in the early part of the period before recovering, a SIP buys more units at lower prices along the way (rupee-cost averaging), which can close the gap or overtake the lumpsum. This calculator assumes a single steady annual return for each, so try running both at a few different assumed rates rather than trusting one number.

Question 2

Why does the comparison use the same total amount?

Accepted Answer

Comparing a $10,000 lumpsum against a $500/month SIP tells you very little, since one path had far more money invested for far longer. Fixing the total amount and period, and only changing how it’s deployed — all at once versus spread evenly — isolates the one variable that actually matters for the "SIP or lumpsum" question.

Question 3

Can I use different return assumptions for each side?

Accepted Answer

Yes — the two return fields are independent on purpose. Some people assume markets outperform in the long run and give the lumpsum credit for more time invested; others assume a SIP’s averaging effect deserves a different assumed return. Set them equal for a pure "same return, different timing" comparison, or vary them to model your own view.

Question 4

What does the step-up field do, and why is it only on the SIP side?

Accepted Answer

Step-up increases the monthly SIP instalment by a fixed percentage each year (for example, in line with an annual raise) — it doesn’t apply to a lumpsum, since that’s a single one-time investment with nothing to step up. Turning step-up on means the SIP side is no longer strictly "the same total amount," since a stepped-up SIP ends up contributing more over the period than the flat monthly figure — the invested-amount readouts below each panel always show the actual total either way.

Question 5

Does this account for taxes or exit loads?

Accepted Answer

No — like the other investment calculators on this site, this compares pre-tax, pre-fee growth only. Capital gains tax treatment can differ between a lumpsum and staggered SIP purchases (each SIP instalment has its own purchase date for tax purposes), so factor that in separately for your jurisdiction before deciding.

SIP vs Lumpsum Calculator

Same money, two different schedules

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