SIP or a fixed deposit

These two get compared as if one had to win. They do different jobs. A fixed deposit is a contract with a bank. A mutual fund SIP is a monthly investment in a portfolio of securities whose value moves. Comparing them fairly means being exact about what each one actually promises and what each one actually risks — not deciding in advance that one is better.

What each one actually promises

A fixed deposit is the more honest word of the two, because it means what it says. You lend the bank a sum for a fixed term, and the bank agrees in advance to pay a stated rate of interest and to return your principal at maturity. That rate is written into the contract. It does not move when markets move. This is a real commitment by the bank, and it is fair to say so plainly.

There is a backstop behind that commitment. Deposits in a scheduled commercial bank are insured by the DICGC up to ₹5,00,000 per depositor per bank, principal and interest together. Below that ceiling your money is about as protected as money in India gets.

A mutual fund makes no such promise, and this is not a defect — it is the design. No one contracts to pay you a rate. No one guarantees your capital back. Not the fund house, not the distributor, not us. The value of your units is whatever the securities the fund holds are worth on the day, which is why it can be higher or lower than what you put in. When someone tells you a fund will “give” a return, they are describing a hope, not a contract.

What each one actually risks

Because the deposit is contracted, its risk is not that the bank fails to pay the rate. Its risks are quieter. When the deposit matures and you renew it, the rate on offer may be lower than the one you had — you do not get to lock today’s rate forever. Above the ₹5,00,000 insurance ceiling you are relying on the bank’s own soundness. And the largest risk is the one the deposit cannot do anything about, which is what your money will buy when you get it back. That one has its own section below.

A mutual fund’s risk is the loud, obvious kind: the price of what it holds can fall, and stay fallen for a while. An equity fund can be worth less than you invested for years at a stretch. There is no floor under it. In exchange for carrying that risk, and only in exchange for it, an investor is reaching for a return the deposit does not try to offer. Reaching is not the same as receiving. The risk is the price of admission, not a promise about the destination.

The quiet risk inside a “safe” deposit

Call a deposit “safe” and you usually mean the rupee figure cannot fall. It cannot. But the number of rupees is not the point — what they buy is. Prices rise every year, and a rupee in fifteen years will buy less than a rupee today.

Put numbers on it, as an illustration and not a forecast. If prices rise about 6% a year, something that costs ₹1,00,000 today will cost roughly ₹2,40,000 in fifteen years. So a deposit paying 7% while prices rise 6% is not really growing your money at 7%. It is growing your purchasing power by about 1% a year — and that is before tax. This is the trade the deposit makes: certainty about the rupee figure, in return for accepting that inflation is chewing on it the whole time. That is a real cost, and it is invisible precisely because the number on the statement never goes down.

How each one is taxed

The two are taxed on different principles, and this changes what you actually keep. Interest on a fixed deposit is added to your income and taxed at your slab rate, in the year it accrues, whether or not you have withdrawn it. For someone in a higher slab, a deposit paying 7% can be worth closer to 5% once tax is taken, which is what turns a small real gain into a real loss against 6% inflation.

Units in an equity mutual fund are taxed on a different basis, generally only when you sell, and gains held long enough are treated differently again. We are deliberately not putting rates on this, because tax treatment depends on your own circumstances, on how long you hold, and on rules that change. The point here is narrow: comparing the headline 7% of a deposit with the headline return someone quotes for a fund is not like-for-like until you have taken tax off both. Confirm your own position with a qualified tax adviser before you rely on any of it.

Getting your money out early

Both let you exit early, and both charge you for it in their own way. Break a fixed deposit before maturity and the bank typically pays you a lower rate than the one contracted, often with a small penalty on top. You get your principal back — you simply earn less than you were promised for going the distance.

A mutual fund is usually redeemable within a few working days, but the price you get is the NAV on the day you sell, which may be below what you paid. Some schemes also apply an exit load if you leave within a defined period. So the deposit returns a known amount minus a penalty, while the fund returns an unknown amount set by the market. Neither is a trap; they fail differently, and it is worth knowing which kind of failure you can live with.

Why most people should hold both

Read the sections above and the two instruments stop looking like rivals. They answer different questions.

• Money you may need soon, or must not see fall. An emergency fund, a fee due next year, a sum you have already promised to something. The deposit’s certainty is exactly right, and the inflation drag over a short horizon is small enough to ignore.
• Money for a goal many years away. Here the deposit’s quiet inflation risk becomes the dominant one, and an equity SIP’s willingness to carry market risk is the point rather than the problem.

This is why the honest answer to “SIP or FD?” is usually “both, in different proportions, for different jobs.” The split that is right for you depends on your horizon, your other savings and how you sleep, which is a question for a plan, not an article.

Try the arithmetic

Our calculator compounds a rate you choose over a period you choose. Run a modest deposit-like rate and a higher one side by side to see how much of the gap inflation and tax quietly close. It is a formula with your numbers in it, not a forecast of any real fund or deposit.

If you would rather work out the split against a real goal, that is what goal-based planning is for.