SIP vs FD: which suits which goal
FDs are safe, taxable and barely beat inflation after tax. Equity SIPs grow faster over long horizons but swing hard. How to match each to a goal, with the tax and return maths.
4 min read · Published 2026-10-31 · Last reviewed 2026-10-31
"Should I put my money in an FD or start a SIP?" is the wrong question, because the two products answer different questions. A fixed deposit answers "how do I keep this money safe and available?" An equity SIP answers "how do I grow this money over many years?" Once you attach a goal and a date to each rupee, the choice usually makes itself. This guide gives you the numbers to do that.
What each actually is
A fixed deposit lends your money to a bank at a fixed rate for a fixed term. In 2026 one- to three-year deposits at large banks pay about 6.5–7.25%, small finance banks a point more, and senior citizens get 0.25–0.5% extra. Deposits up to ₹5 lakh per bank are insured by DICGC. The return is certain; the purchasing power is not.
A systematic investment plan is not a product but a method: a fixed amount every month into a mutual fund. Most people mean an equity fund. There is no promised return. Indian large-cap indices have delivered roughly 11–13% a year over rolling 15-year periods, with individual years ranging from −50% to +75%. Monthly investing smooths the entry price but does not remove the risk.
Returns after tax, which is what you keep
| FD at 7% | Equity SIP at 12% expected | |
|---|---|---|
| Tax on gains | Slab rate, every year, even if not withdrawn | 12.5% on long-term gains above ₹1.25 lakh a year, only when you sell |
| Post-tax return, 30% slab | about 4.9% | about 10.5–11% |
| Post-tax return, 5% slab or nil | 6.65–7% | 10.5–12% |
| Real return after 5% inflation (30% slab) | about −0.1% | about 5.5–6% |
For a 30% taxpayer, an FD roughly preserves purchasing power and nothing more. Banks also deduct TDS at 10% once interest crosses ₹40,000 a year (₹50,000 for seniors) unless you file Form 15G/15H.
The maths of ₹10,000 a month for 10 years
Invested: ₹12 lakh in both cases.
- FD-like 7%, with interest reinvested: about ₹17.4 lakh before tax, roughly ₹15.8 lakh after tax at 30%.
- SIP at 12%: about ₹23.2 lakh, of which ₹11.2 lakh is gain; after the ₹1.25 lakh exemption and 12.5% tax on the rest, about ₹22 lakh.
Over 20 years the gap widens dramatically: ₹24 lakh invested becomes about ₹52 lakh in the deposit and ₹1 crore in the SIP at those rates, before tax. Compounding at a higher rate is the whole argument for equity, and it only works if you stay invested through the bad years.
Match the product to the horizon
| Goal and horizon | Suitable | Why |
|---|---|---|
| Emergency fund, any time | FD, sweep-in FD, liquid fund | Must be available tomorrow at full value |
| House down payment in 1–3 years | FD, short-duration debt fund | A 30% equity fall in year two would wreck the plan |
| Car or wedding in 3–5 years | Mostly FD or debt, small equity portion | Partial recovery time |
| Child's college in 10+ years | Equity SIP, shifting to debt in the last 3 years | Long enough to ride out cycles |
| Retirement in 15+ years | Equity SIP plus EPF/NPS | Longest horizon, highest real return needed |
The rule of thumb: money you need within five years does not belong in equity; money you will not touch for ten years does not belong in a fixed deposit.
Risks each side ignores
FD buyers ignore inflation and reinvestment risk: a 7% deposit maturing into a 5.5% rate environment leaves you poorer in real terms. They also ignore bank risk above ₹5 lakh, small but not zero with smaller banks.
SIP investors ignore sequence risk: a 40% fall in the year before you need the money erases years of gains. They also ignore behaviour: most investors stop SIPs after a fall, which is precisely when the method works best. And they ignore fund selection: a low-cost index fund has beaten the majority of active large-cap funds over ten years, so the expense ratio matters.
Using both
A practical structure for a salaried household: six months of expenses in FDs or liquid funds, goals under five years in FDs and debt funds, and everything longer in equity SIPs with a step-up each year as income grows. Review once a year; move money from equity to deposits as a goal comes within three years.
Project an FD with the FD calculator, a SIP with optional yearly step-up in the SIP calculator, and check what any past investment actually earned with the CAGR calculator.
Sources
This guide is general information, not financial, tax or legal advice. Rules change; the review date above tells you when it was last checked. See our editorial policy.