The short answer
- An FD or RD usually suits money you need within about three years, an emergency fund, or any goal where a loss isn't acceptable.
- An equity SIP may suit goals five or more years away, where you can sit through falls and want returns that may beat inflation.
- Many people use both: an FD for safety and near-term needs, a SIP for long-term growth.
Side by side
| Fixed deposit / RD | Equity mutual fund SIP | |
|---|---|---|
| Return | Fixed when you open it | Depends on the market; not guaranteed |
| Can it lose money? | Not in rupee terms, unless the bank fails and you have more than the ₹5 lakh insured amount there | Yes, especially over short periods |
| Safety net | Bank deposits insured by DICGC up to ₹5 lakh per depositor per bank, principal and interest together (company FDs aren't covered) | No guarantee; regulated by SEBI |
| Getting your money early | Possible, usually with a lower interest rate | Possible any working day; many equity funds charge an exit load within a year |
| Tax | Interest taxed at your slab rate every year | Gains taxed only when you sell, at lower rates for equity held over a year |
What ₹5,000 a month could become
| ₹5,000 a month for | You invest | RD at 6.5% | SIP at 10% | SIP at 12% |
|---|---|---|---|---|
| 3 years | ₹1,80,000 | ₹1,99,122 | ₹2,09,201 | ₹2,15,396 |
| 5 years | ₹3,00,000 | ₹3,54,954 | ₹3,85,859 | ₹4,05,518 |
| 10 years | ₹6,00,000 | ₹8,44,940 | ₹10,07,288 | ₹11,20,179 |
| 15 years | ₹9,00,000 | ₹15,21,326 | ₹20,08,106 | ₹23,79,657 |
Over three years the gap is small and the FD's certainty may be worth more. Over ten or fifteen years the assumed SIP return compounds into a much larger amount, which is the main argument for SIPs, as long as you accept that the real result could be lower than these figures.
Tax can widen the gap
FD and RD interest is added to your income and taxed at your slab rate each year, even if you don't withdraw it. Equity fund gains are taxed only when you sell: at 12.5% on long-term gains above ₹1.25 lakh a year for units held more than 12 months, and at 20% for units held 12 months or less.
Example: ₹5,000 a month for 10 years, someone in the 30% slab, all redeemed in one year at the end:
| RD at 6.5% | SIP at an assumed 12% | |
|---|---|---|
| You invest | ₹6,00,000 | ₹6,00,000 |
| Before tax | ₹8,44,940 | ₹11,20,179 |
| Interest or gain | ₹2,44,940 | ₹5,20,179 |
| Approximate tax | ₹76,421 | ₹51,672 |
| After tax | ₹7,68,519 | ₹10,68,507 |
Selling the SIP over two or more financial years uses the ₹1.25 lakh exemption more than once and lowers the tax further (the limit is shared by all your equity funds and shares in a year). Two tax-saving options compare differently: a 5-year tax-saver FD and an ELSS fund both count towards the Section 80C deduction under the old tax regime, but the FD locks your money for 5 years and each ELSS installment for 3 years. Tax rules change, so check the current rates or ask a tax adviser before you rely on them.
Inflation is the hidden cost of an FD
If prices rise about 5% a year and your FD earns 6.5% before tax, someone in the 30% slab keeps roughly 4.5% after tax, which is below inflation: the money grows in rupees but buys less. India's official inflation target is 4%, within a 2% to 6% band, and actual inflation moves around it. That's the main reason long-term money is often put into equity despite the ups and downs.
When an FD usually makes more sense
- An emergency fund, usually a few months of expenses.
- A goal within about three years, such as a down payment or fees.
- Money you'd be badly hurt to see fall even 20% for a while.
To plan a SIP, use the SIP calculator or the SIP return table; to see how long a sum lasts once you start withdrawing, use the SWP calculator.