RD vs. SIP: which suits your goal?

A recurring deposit and a SIP both take an identical fixed monthly instalment and build it into a lump sum, so the discipline of committing to that outflow looks the same either way. What differs is what happens to the money afterward. And the gap between the two isn’t really about which one “wins.”

Guaranteed return vs. market-linked growth

An RD’s interest rate is fixed and contractually guaranteed for the whole tenure. Whatever rate the bank quotes on the day you open it is the rate you get, no matter what happens to markets or the wider economy afterward. A SIP into an equity mutual fund makes no such promise. Its return depends entirely on how the underlying fund performs, and that can land well above or well below any assumed figure — including negative, over a bad enough stretch.

The same ₹5,000/month, two different assumptions

Run an identical ₹5,000/month contribution for 5 years through each calculator’s own default rate: the RD calculator’s 7% p.a. guaranteed figure against the SIP calculator’s 12% assumed return. A real gap shows up.

That difference comes entirely from 12% being a bigger number than 7%, not from anything structurally superior about a SIP. Run the SIP formula at RD’s own 7% rate instead, and the isolation becomes obvious:

Why the gap widens so much over a longer horizon

Stretch that same ₹5,000/month contribution out to 15 years, still at each calculator’s own default rate, and the gap between the two assumptions compounds into something far bigger:

That widening gap is why this was never really a question of which one is better. It’s a question of what the money is for. A goal with a known deadline in the next few years needs certainty more than upside, which is where an RD’s guaranteed rate earns its keep — equity volatility isn’t something you have time to ride out on that kind of timeline. A SIP’s higher assumed return, by contrast, only gets room to play out over a longer horizon, since a downturn close to the goal date can erase years of assumed gains in a way a fixed-rate instrument simply can’t lose. Many people split a goal across both: RD for the near-term, certain portion, SIP for whatever part still has years left to run. That way neither trade-off has to be picked over the other.