Kiran-bhai runs a small hardware shop in Jamnagar. In September an old five-year FD matured, his Diwali collections came in early, and for the first time in his life he had ₹5 lakh in one place with no bill waiting for it. Within a week he had three offers: the bank wanted to renew the FD, a relative who sells insurance had a "one time investment plan" with a guaranteed payout, and his nephew said put it all in a mutual fund and forget it for ten years.
That is the one-time investment question. Not "should I start a SIP", but "this money is already here, where does it sit for the next ten years?" This post takes the same ₹5 lakh through every door, with rates as of October 2026, and shows what comes out after ten years, what tax takes, what the lock-in is, and what can go wrong. The numbers are from the lumpsum calculator and the FD calculator, so you can rerun them with your own amount.
Six places a one-time amount can go
Almost every "one time investment plan" on offer in India is one of these with a different label on the front.
- Savings account. The default. Money that never got invested. SBI pays 2.5% a year on savings balances, and the post office savings account pays 4%.
- Bank FD. One deposit, fixed rate, fixed date. SBI's card rate for 5 to 10 years is 6.05% as per its retail term deposit page (w.e.f. 15 December 2025, still the published rate in October 2026). Some smaller banks pay more for the same tenure.
- Post office certificates. NSC pays 7.7% for 5 years and Kisan Vikas Patra pays 7.5% and doubles your money in 115 months, as per India Post's savings schemes page. The finance ministry kept all small savings rates unchanged for October to December 2026, as reported in this report on the 30 September 2026 memorandum.
- Single-premium insurance plan. You pay once, you get a life cover plus a "guaranteed" maturity amount after 10, 12 or 15 years. This is what is usually sold under the name "one time investment plan".
- Mutual fund lumpsum. One purchase of units in an equity, hybrid or debt fund. No fixed return. We use 10% and 12% a year as assumptions for an equity fund, because that is what most planners use, not because anyone promises it.
- Sovereign gold bond. Government paper that tracks the gold price and pays 2.5% a year on top. One problem in 2026: no new bonds have been issued since February 2024. More on that below.
Kiran-bhai's three offers were doors 2, 4 and 5. The savings account is where the money sits while he decides, so it gets a row in every table.
New to the word itself? Lumpsum kya hai explains what a lumpsum is and when it beats a monthly SIP.
What ₹5 lakh becomes in 10 years, before tax
Same money, same ten years. FD and savings interest compound quarterly, NSC and KVP yearly, as the products actually work. For the mutual fund we show both assumptions.
| Where it goes | Rate (Oct 2026) | After 10 years | Gain |
|---|---|---|---|
| SBI savings account | 2.5% | ₹6,41,513 | ₹1,41,513 |
| Post office savings account | 4% | ₹7,40,122 | ₹2,40,122 |
| SBI FD, 10 years | 6.05% | ₹9,11,488 | ₹4,11,488 |
| Small finance bank FD, 10 years | 7% (example) | ₹10,00,799 | ₹5,00,799 |
| NSC, 5 years, then reinvested 5 more | 7.7% | ₹10,49,849 | ₹5,49,849 |
| Kisan Vikas Patra | 7.5% | ₹10,00,000 in 115 months | ₹5,00,000 |
| Single-premium plan, "guaranteed" ₹8.5 lakh | works out to 5.45% | ₹8,50,000 | ₹3,50,000 |
| Equity mutual fund, assumed 10% | not fixed | ₹12,96,871 | ₹7,96,871 |
| Equity mutual fund, assumed 12% | not fixed | ₹15,52,924 | ₹10,52,924 |
Assumptions: ₹5,00,000 invested once and left alone. The NSC row assumes the second certificate also gets 7.7%, which nobody can promise. The 7% row is an example rate, not a quote. The insurance row is a typical offer, explained next. KVP reaches ₹10 lakh at 115 months (9 years 7 months), five months short of ten years.
Two things to notice. The gap between the savings account and the FD is ₹2.7 lakh, the cost of leaving money "for now" in the account for a decade. And the gap between a 6.05% FD and a 10% fund is ₹3.85 lakh, with another ₹2.56 lakh between 10% and 12%. The bottom of the table is where the money is, and also where none of it is guaranteed. To see the equity rows for 5 to 20 years, open ₹5 lakh as a mutual fund lumpsum.
How to read a "guaranteed" single-premium plan
This is the one most people get wrong, because the brochure gives you a rupee amount, not a rate. "Pay ₹5 lakh once, get ₹8.5 lakh guaranteed after 10 years, plus life cover." It sounds like a 70% return. Spread over ten years with compounding, it is 5.45% a year. The quick check is the rule of 72: a plan that doubles your money in 10 years is paying about 7.2% a year, and most guaranteed plans do not even double.
So turn the promised amount into a yearly rate and put that rate next to the FD and NSC rows above. The lumpsum calculator does this in reverse: try rates until the result matches the brochure.
| Promised after 10 years on ₹5 lakh | Yearly return it works out to | Compare with |
|---|---|---|
| ₹7,00,000 | 3.42% | Below the post office savings account |
| ₹8,00,000 | 4.81% | Below every FD in the table |
| ₹8,50,000 | 5.45% | Below SBI's 6.05% FD |
| ₹10,00,000 | 7.18% | About the same as KVP |
| ₹12,00,000 | 9.15% | Nobody guarantees this for 10 years |
To be fair, you are also buying a life cover, and cover costs something. So ask: how big is it? If the sum assured is ₹50 lakh on a ₹5 lakh premium, part of the lower return is paying for real protection. If the cover is ₹6.25 lakh, which is common in single-premium plans (1.25 times the premium), you are paying for almost no protection and still getting an FD-minus return.
That small cover has a second cost. Under section 10(10D), the maturity amount of a life policy is tax-free only if the premium in any year is not more than 10% of the sum assured, for policies issued on or after 1 April 2012, as explained on this Stable Investor explainer. For a single-premium plan the cover must be at least 10 times the premium. With ₹5 lakh premium and ₹6.25 lakh cover, the ₹3.5 lakh gain is taxed at your slab in the year you receive it. There is also a ₹5 lakh yearly premium cap for policies issued on or after 1 April 2023, as noted in Outlook Money's summary. The Income Tax Department's page on this was not opening while we wrote this, so check the policy document and your CA before you sign.
None of this makes single-premium plans a scam. They suit someone who wants a fixed number on a fixed date and will not touch the money in between. Just compare them at the rate, not the rupee figure.
What you keep after tax
The before-tax table flatters the fixed-income side. FD, NSC, KVP and savings interest is added to your income and taxed at your slab every year, even when you have not withdrawn a rupee. Equity fund gains are taxed only when you sell, and only above ₹1.25 lakh a year, at 12.5% plus cess, for units held over 12 months, as per ClearTax's note on long-term capital gains. (The Income Tax Department's pages were not opening while we wrote this.) Here is the same table for someone in the 30% slab, which with 4% cess is 31.2% of every rupee of interest.
| Where it goes | Before tax | After tax (30% slab) | Post-tax yearly return |
|---|---|---|---|
| SBI savings account, 2.5% | ₹6,41,513 | ₹5,93,620 | 1.72% |
| SBI FD, 6.05% | ₹9,11,488 | ₹7,56,496 | 4.16% |
| NSC, 7.7% | ₹10,49,849 | ₹8,37,828 | 5.30% |
| Single-premium plan, ₹8.5 lakh, taxable | ₹8,50,000 | ₹7,40,800 | 4.01% |
| Equity fund, assumed 10% | ₹12,96,871 | ₹12,09,528 | 9.24% |
| Equity fund, assumed 12% | ₹15,52,924 | ₹14,32,294 | 11.10% |
Assumptions: interest taxed yearly at 31.2%, so the FD effectively grows at 4.16% and NSC at 5.30%. The insurance row assumes the 10(10D) exemption is lost and the ₹3.5 lakh gain is taxed at 31.2% in year 10. Equity tax: 12.5% plus cess on gains above ₹1.25 lakh, all units sold in year 10. In the 20% slab the FD gives ₹8,05,063 and NSC ₹9,03,771. If your total income stays within the new regime's rebate limit, the before-tax table applies.
Two details. The bank cuts TDS on FD interest above ₹50,000 a year, which the post on FD tax and TDS walks through. And NSC interest is reinvested for the first four years and counts towards 80C in the old regime, as per ClearTax's NSC page, which softens its tax a little. KVP has no such benefit.
Read the last column again. After tax, the "safe" products give a 30% slab investor 4 to 5.3% a year, and inflation has been around 5%. That is the real reason people with a ten-year horizon look at the equity rows at all.
Risk: what can actually go wrong in each
"Risk" on a brochure usually means one thing, that the number can go down. In practice there are three different risks, and the products carry them differently.
The number goes down
Only the mutual fund and the gold bond can show you less than ₹5 lakh. An equity fund can be down 20 to 30% a year or two after you invest, and what ten years delivers depends a lot on which ten years they are. The 10% and 12% in our tables are planning assumptions, not a promise for any particular decade. The other products cannot show a lower number, though a guaranteed plan can if you surrender early.
The institution fails
Post office schemes are backed by the government. Bank deposits are insured by DICGC up to ₹5 lakh per depositor per bank, principal and interest together, so a ₹5 lakh FD plus its interest is already above the cover at one bank. Mutual fund units are held in your name, so a fund house closing does not take your money, the fund's investments falling does. An insurer's guarantee is only as strong as the insurer.
The rate moves against you
RBI raised the repo rate by 25 basis points to 5.5% on 7 October 2026, the first hike since 2023, as reported by Business Today. Lock a 10-year FD today at 6.05% and if deposit rates go to 7% next year, you are stuck, or you break the FD with a penalty. NSC and KVP lock their rate at purchase. A guaranteed plan locks its rate for 10 years with no exit. An equity fund has no rate to lock.
Lock-in: how fast you can get the money out
Ten years is the plan. Life does not always agree. Here is what each product does when you need the money early.
| Product | Can you take it out? | What it costs you |
|---|---|---|
| Savings account | Any day | Nothing |
| Bank FD | Any day | The rate for the period you stayed, usually minus 0.5 to 1% |
| NSC | Locked 5 years, except on death, court order or if pledged | Cannot encash before maturity in normal cases |
| KVP | After 2 years 6 months | A lower encashment value as per the post office table |
| Single-premium plan | Surrender allowed | Surrender value in early years can be well below ₹5 lakh, and the guarantee goes |
| Equity mutual fund | Any working day, money in 2 to 3 days | Exit load, often 1% in the first year, tax on the gain, and whatever the market is doing that week |
| Sovereign gold bond | RBI buyback after 5 years, or sell on the exchange any day | Exchange price is often below the gold price because of thin trading |
The lesson is not "pick the most liquid". It is that a one-time amount should not all sit in one lock-in. Keeping ₹1 lakh of the ₹5 lakh in a sweep-in FD costs a little return on that part and removes the chance that an emergency forces a broken FD or a fund sale in a bad month.
Sovereign gold bond: a good product that is on pause
Many "where to invest a lumpsum" articles still list SGB. The facts in October 2026: the last new issue was the 2023-24 Series IV in February 2024, and RBI's SGB page shows only redemption notices since then, the latest dated 14 October 2026. You cannot walk into a bank and buy a fresh SGB today.
What you can do is buy old series on the NSE or BSE from someone who wants out. The terms stay the same, as per RBI's SGB FAQ: 2.5% a year on the issue price, paid half-yearly, an 8-year life, and RBI buys back after the fifth year on the interest dates (the redemption calendar for October 2026 to March 2027 lists 32 such windows). But Budget 2026 changed the tax: from 1 April 2026 the capital gains exemption at maturity is only for the original subscriber who held till redemption. Buy on the exchange and the gain at maturity is taxed at 12.5% if held over a year, as Moneylife reported on 2 February 2026.
For the comparison, if gold rose 8% a year for 8 years (an assumption, gold has had flat decades too), ₹5 lakh in an SGB would be worth ₹9,25,465 plus ₹1,00,000 of interest, ₹6,250 every six months. A gold ETF or gold fund gives the price part without the 2.5%. The gold return calculator takes your own buy price and making charges. Gold belongs in this list as a 5 to 15% slice, not as the home for the whole ₹5 lakh.
If you go the gold route, three posts cover it in full: what gold has returned in the last 10 and 20 years, coins, jewellery, digital gold, ETF and SGB compared on cost to buy, cost to sell and tax, and what making charges and GST do to a jewellery purchase.
The ₹8.95 lakh line
Here is the number to hold every row against. At 6% inflation, what ₹5 lakh buys today will cost ₹8,95,424 in ten years (₹8,14,447 at 5%). RBI's projection for this year is 5.2%, and school fees and hospital bills run higher than the overall index. So any option that gives you less than roughly ₹9 lakh after tax has made you poorer in what it can buy.
- Savings account: ₹6,41,513, worth about ₹3.58 lakh in today's rupees. A clear loss.
- SBI FD after 30% tax: ₹7,56,496. Below the line.
- NSC after 30% tax: ₹8,37,828. Just below the line.
- Guaranteed plan at ₹8.5 lakh: on the line before tax, below it after.
- Equity fund at 10% after tax: ₹12,09,528, worth about ₹7.24 lakh today. Ahead, if the 10% shows up.
That is the trade-off. The fixed options protect the rupee number and lose a little buying power every year. The market option protects buying power on average and can lose rupees for stretches. Money needed in three years goes in the first kind. Money that can genuinely sit for ten belongs at least partly in the second.
Matching the ₹5 lakh to what it is for
There is no single best door. There is a best door for each purpose, and most one-time amounts have more than one purpose. Three questions sort it: when will I need it, can I watch it fall without selling, and am I paying tax at 30%?
| The money is for | Reasonable home | Why |
|---|---|---|
| Emergencies, or anything within 3 years | Sweep-in FD or short FD | Rupee number cannot fall, out in a day |
| A known expense in 5 years, 30% slab | NSC, or a 5-year FD | Highest safe rate, locked, 80C in old regime for NSC |
| A known expense in 5 years, low or nil tax | 5-year FD or post office time deposit | Interest is barely taxed, so the FD's simplicity wins |
| Retirement, child's education, 10 years or more | Equity fund, moved in over 6 to 12 months | The only row with a realistic chance of beating inflation after tax |
| A fixed amount on a fixed date, no discipline for renewals | Guaranteed plan, only with 10 times cover | Accept a lower rate for the certainty, keep the tax exemption |
On the equity part, do not put all of it in on one day if that thought will keep you awake. Park it in a liquid fund and move a fixed amount into the equity fund every month for 6 to 12 months. That is a Systematic Transfer Plan, and the post on STP has the rupee numbers for what it costs when markets rise and what it saves when they fall, plus the form. The lumpsum vs SIP post covers one-go against spreading more broadly.
What Kiran-bhai did
He is 41, in the 20% slab, with a steady income from the shop. He split the ₹5 lakh three ways. ₹1 lakh went into a sweep-in FD, his first real emergency fund. ₹1.5 lakh went into NSC at 7.7%, which matures to ₹2,17,355 in five years, right when his daughter's college fees start. The remaining ₹2.5 lakh went into a liquid fund with a 10-month STP into an index fund, for a goal fifteen years away. At an assumed 10% that part is ₹6,48,436 in ten years on the lumpsum calculator, and he has written down that it can show ₹2 lakh in a bad year and he will not touch it.
The relative's guaranteed plan got none of it. Not because it was a bad product, but because at 5.45% it was below the NSC for the same certainty, and the ₹6.25 lakh cover would have made the maturity taxable. Kiran-bhai bought a plain ₹50 lakh term plan separately. That was the one right piece of the insurance pitch, and it did not need ₹5 lakh to buy.
Before you decide, put your own amount, rate and years into the lumpsum calculator and the FD calculator, side by side. The difference between the two screens is the whole decision.
Frequently asked questions
What is a one time investment plan?
Any product where you put in money once and leave it, instead of a monthly SIP. In India that usually means a bank FD, NSC or KVP at the post office, a single-premium insurance plan, or a lumpsum into a mutual fund. ₹5 lakh in a 6.05% FD becomes ₹9,11,488 in 10 years, and in an equity fund at an assumed 12% about ₹15.53 lakh, with no guarantee.
Is a one time investment plan in LIC or any insurer a good idea?
Judge it by the yearly rate, not the rupee figure. A plan that turns ₹5 lakh into ₹8.5 lakh in 10 years is paying 5.45% a year, below SBI's 6.05% FD and NSC's 7.7%. If the life cover is less than 10 times the premium, the maturity amount also loses its 10(10D) tax exemption. It suits someone who wants a fixed number on a fixed date and will not touch the money.
What does ₹5 lakh become in 10 years in a mutual fund?
At an assumed 10% a year, ₹12,96,871. At 12%, ₹15,52,924. These are assumptions, not promises, and the fund can be below ₹5 lakh for stretches. After long-term capital gains tax of 12.5% plus cess on gains above ₹1.25 lakh, the 10% case leaves about ₹12.1 lakh.
FD or NSC for a one-time amount?
NSC pays 7.7% against SBI's 6.05% for 5 to 10 years as of October 2026, so ₹5 lakh grows to ₹10,49,849 in ten years if reinvested once at the same rate, against ₹9,11,488 in the FD. The FD can be broken any day with a small penalty, NSC is locked for 5 years. Both are taxed at your slab, though NSC's reinvested interest counts towards 80C in the old regime.
Can I still buy sovereign gold bonds as a one-time investment?
Not fresh ones. No new SGB has been issued since February 2024, and RBI's page shows only redemption notices since. Old series trade on NSE and BSE, but from 1 April 2026 the tax-free redemption is only for original subscribers who held till maturity, so a bond bought on the exchange is taxed at 12.5% on the gain at maturity.
Should I invest a lumpsum in equity all at once or in parts?
If the money can stay invested 10 years, putting it in at once has historically done better on average, but it hurts if the market falls right after. The middle path is an STP: park the amount in a liquid fund and move a fixed sum into the equity fund every month for 6 to 12 months. Our STP post has the rupee cost and benefit of that.
For general information, not as investment or tax advice. Rates and rules change, so check the latest before you decide. Tell us if something here is out of date. Editorial policy · Contact
