Real numbers on returns, tax, and inflation. The answer may surprise long-time FD investors.
Fixed Deposits are the default investment for crores of Indian families. They are predictable, safe, and simple. Open an FD, lock in a rate, collect interest — done. No market watching required.
SIPs in mutual funds, on the other hand, promise higher returns but come with a word that makes conservative investors nervous: market-linked. No guaranteed rate. No fixed maturity amount. The corpus goes up and down with markets.
Over 10 years, ₹5,000/month in a SIP at 12% builds ₹11.6 lakh. The same amount in an FD/RD at 6.5% builds ₹8.5 lakh. After accounting for tax, the gap widens to nearly ₹3.5 lakh. That difference is not a rounding error — it is a financial decision worth understanding.
Both are legitimate investment vehicles. The real question is: for someone investing ₹5,000–₹10,000/month over 10–20 years with a long-term wealth goal, which is the right choice? The numbers tell a clear story.
Let us compare ₹5,000 invested every month in an RD at 6.5% versus a SIP at 12% CAGR, over 10 and 20 years. The 12% figure is a conservative long-term planning assumption for diversified equity mutual funds — historically, large-cap and flexi-cap funds in India have delivered 10–14% CAGR over rolling 10-year periods.
| Scenario | Total Invested | RD @ 6.5% | SIP @ 12% | SIP Advantage |
|---|---|---|---|---|
| ₹5,000/month — 10 years | ₹6,00,000 | ₹8,47,000 | ₹11,62,000 | +₹3,15,000 |
| ₹5,000/month — 20 years | ₹12,00,000 | ₹24,66,000 | ₹49,96,000 | +₹25,30,000 |
| ₹10,000/month — 10 years | ₹12,00,000 | ₹16,94,000 | ₹23,23,000 | +₹6,29,000 |
| ₹10,000/month — 20 years | ₹24,00,000 | ₹49,32,000 | ₹99,92,000 | +₹50,60,000 |
RD calculated at 6.5% p.a. with monthly compounding. SIP at 12% p.a. using standard future value of annuity formula. Rounded to nearest ₹1,000. Past equity returns are not a guarantee of future performance.
The compounding gap becomes extraordinary over 20 years. A ₹10,000/month SIP builds approximately ₹1 crore, while the same RD contribution produces ₹49 lakh — barely half. Both invested the same ₹24 lakh. The entire difference is the return rate.
Going from 6.5% to 12% does not seem like much — it is only 5.5 percentage points. But because compounding is exponential, that gap almost doubles your final corpus over 20 years. This is why even a small, sustained improvement in return rate has an outsized long-term impact.
Conversely, if equity markets underperform and your SIP delivers only 10% instead of 12%, the final corpus drops to about ₹76 lakh — still well ahead of FD.
The returns comparison above does not even account for tax. When you factor in tax, the gap between SIP and FD widens substantially — especially for investors in higher income tax brackets.
FD and RD interest is added to your total income and taxed at your applicable income tax slab rate. If you are in the 30% slab, every ₹100 of FD interest nets you only ₹70. Your effective post-tax return on a 6.5% FD drops to approximately 4.55%. Banks also deduct TDS at 10% if interest exceeds ₹40,000 per year (₹50,000 for senior citizens).
For equity mutual funds (held more than 1 year):
Unlike LTCG on SIP which is realised only when you redeem, FD interest is taxable in the year it accrues — even if you reinvest it. This annual tax drag significantly reduces the effective compounding power of FDs for investors in the 20–30% slab. Over 20 years, this tax drag compounds and the gap versus SIP grows dramatically.
India's average CPI inflation has hovered around 5–6% annually over the past decade. This is the most underappreciated risk of FD investing for long-term wealth building.
A 30% tax bracket investor keeping money in FDs is effectively losing purchasing power each year in real terms. Their ₹8.47 lakh after 10 years will buy less than their original ₹6 lakh can buy today. SIP investors, by contrast, are genuinely growing their real wealth at roughly 5–6% per year after adjusting for inflation.
Returns and tax tell one side of the story. FD has real advantages that SIP cannot replicate, and ignoring them leads to bad financial decisions.
Emergency fund (3–6 months of expenses): FD or liquid mutual fund. Non-negotiable. This money must never go into equity.
Short-term goals (1–3 years): FD or debt mutual fund.
Long-term wealth building (5+ years): SIP in equity mutual funds. Every month, automatically.
Most middle-class Indian investors have too much in FDs and too little in equity SIPs. The right allocation is the reverse — FDs for short-term needs, equity SIPs for long-term goals.
Enter your monthly amount, expected return, and time horizon to see exactly how much your SIP corpus will be worth — with a full breakdown of invested amount vs. returns.
Calculate Your SIP Returns →For a 5-year horizon, SIP in a diversified equity mutual fund is likely to outperform FD, but the advantage is smaller and less certain than over 10–20 years. Equity markets can be volatile over 5-year windows — there have been periods (2000–05, 2007–12) where equity delivered less than FD over 5 years.
If your goal is exactly 5 years away and it is critical (e.g., a child's college fund), consider a mix: 50% in equity SIP for growth potential and 50% in a debt fund or FD for capital protection. For a 7+ year horizon, equity SIP is the clear choice historically.
The LTCG tax increase (from 10% to 12.5% in Budget 2024–25) has slightly reduced the post-tax advantage of equity mutual funds. However, the gap vs. FD remains very significant because:
The LTCG change is not a reason to switch from SIP to FD for long-term goals.
Yes, the value of your SIP portfolio can go below your invested amount in the short to medium term, especially during market downturns. This is the fundamental risk trade-off. In 2008, equity fund portfolios fell 50–60% from their peaks. However, investors who continued their SIPs and stayed invested recovered and went on to earn strong long-term returns by 2012–14.
For equity SIPs, historical data on Indian markets shows that investors who stayed invested for any rolling 10-year period on the Nifty 50 never lost money — and earned an average CAGR of 12–14%. The risk of loss is real in the short term; over long periods, the risk reduces dramatically.
This is why the core rule applies: SIP only for money you will not need for at least 5–7 years. Emergency funds and near-term goals belong in FDs.
Generally, do not break an existing FD prematurely — premature withdrawal usually attracts a 0.5–1% penalty on the interest rate, and you will owe tax on the interest earned so far.
Instead: let the FD mature naturally. At maturity, redirect the funds toward your goals — if long-term, start a SIP. In parallel, start a new SIP from your monthly income right away. There is no reason to wait for the FD to mature before beginning a SIP.
The one exception: if you have a very large FD amount (₹5 lakh+) in a long-tenure FD (3–5 years) that you do not need for the next 5+ years, the opportunity cost analysis may justify breaking it. Run the numbers carefully including the penalty before deciding.
For a first-time investor moving from FD to SIP, start with an index fund SIP — specifically a Nifty 50 or Sensex index fund from a reputable AMC (Mirae, UTI, SBI, HDFC, or Axis). These funds:
Start with a small amount (₹2,000–5,000/month) and watch the portfolio for 6–12 months to understand how it behaves during market ups and downs. Then increase your SIP amount as your comfort grows.
