STP in Mutual Funds: How to Invest a Lumpsum in Parts

Open the STP option on any fund house's app and the form is short. A "from" scheme, a "to" scheme, an amount, how often, a start date and the number of instalments. That's more or less the whole product. What those boxes do is take a lumpsum you've parked in a low-risk fund and feed it into an equity fund one fixed slice at a time, so the full amount never goes in on a single unlucky day.

That unlucky day is why people go looking for this screen. Say you have ₹6 lakh for a goal ten years away. Put it all in today, and the market drops 15% next month. That one thought keeps a lot of money sitting in savings accounts for years. A Systematic Transfer Plan is the usual middle path, and it works, but it isn't free. It costs you when markets just go up, every transfer has a small tax bill, and it doesn't always beat investing in one go. Below is what it does, what it costs, the rupee numbers for ₹6 lakh across four market paths, and at the end, how to fill in that form.

What an STP actually is

Underneath the form, an STP is a standing instruction to your mutual fund: on a fixed date every month (or week), sell a set amount from Fund A and buy Fund B with it. Both funds must belong to the same fund house. SEBI's July 2026 circular describes it exactly like that: a redemption from one scheme and a subscription to another scheme of the same mutual fund.

Fund A is where the money waits. Usually that's a liquid fund, which holds very short-term debt paper (up to 91 days), so its value barely moves. Some people use an arbitrage fund, which earns from the small price gap between the cash and futures markets and is taxed like equity. Fund B is the equity fund you actually want.

Think of an STP as a SIP funded by your own parked lumpsum instead of your salary. The waiting money earns liquid-fund returns (roughly 6–6.5% over the past year), not the 2.5% a big-bank savings account pays.

What happens on each transfer date

Once it's registered, the fund house does the rest. On each STP date it sells liquid fund units worth the set amount and buys the equity fund at that day's NAV. Your statement shows it as two entries, one going out of the liquid fund and one coming into the equity fund. When the instalments are over, or the balance runs out, the STP stops on its own.

A fixed STP moves the same amount every time, and it's what most people should use. A capital appreciation STP moves only the gains of the source fund. A flexi STP moves more when the market has fallen and less when it has risen, by a formula that differs by fund house.

Most fund houses offer daily, weekly, monthly or quarterly transfers and want a minimum number of instalments. For example, HSBC Mutual Fund asks for at least 6 instalments of ₹500 each (₹1,000 from its liquid fund), with at least ₹6,000 in the source fund. Others have their own limits.

If you hold your funds in demat through a broker, standing STP instructions aren't available there yet. The same SEBI circular asks for unit-based STPs on demat holdings by 31 January 2027 and amount-based ones by 30 April 2027.

₹6 lakh: lumpsum vs 6-month STP vs 12-month STP

The setup: you have ₹6 lakh. Option one, put it all in the equity fund on day one. Option two, park it in a liquid fund earning 6% a year and move ₹1 lakh at the end of each month for 6 months. Option three, move ₹50,000 a month for 12 months. The last transfer also sweeps whatever interest is left in the liquid fund.

Nobody knows next year's market, so we ran four made-up paths for the first 12 months. The table shows each route's value at the end of month 12, before tax.

No column wins every row. Lumpsum wins clearly when the market just goes up, and over long periods Indian equity has gone up in more years than it has gone down. That's why, on paper, lumpsum comes out ahead more often.

The 6-month STP did best in the dip case because its transfers landed near the bottom. The 12-month STP did best when the fall came late, since half its money was still parked. In that same row, the 6-month STP bought near the peak and did worst.

Now look at the range instead of the winner. Lumpsum ends anywhere between ₹5.08 lakh and ₹7.80 lakh. The 12-month STP ends between ₹5.38 lakh and ₹6.94 lakh. That narrower range is what an STP really buys you. (The paths are illustrations, not forecasts.)

What STP costs when the market just keeps rising

Take the plain case: a steady 12% a year for ten years. ₹6 lakh put in on day one becomes ₹18,63,509 on the lumpsum calculator. For the STPs, we took the value at the end of year one and grew it for nine more years at the same 12%.

So in a smoothly rising market, a 12-month STP costs about 3% of the final amount and a 6-month STP about half that. Treat it as an insurance premium against a crash right after you invest. Is ₹55,000 over ten years worth it? Depends on what you'd do if your ₹6 lakh showed ₹4.8 lakh two months later. If you'd sell everything and run back to FDs, the premium is cheap.

One more comparison. Many people "do an STP" by keeping the money in their savings account and investing ₹50,000 by hand each month. At 2.5%, that waiting money earns roughly ₹8,000 over the year against about ₹19,700 in a 6% liquid fund. That's around ₹11,500 lost, before counting the months people forget or decide to "wait for a dip".

Tax: every transfer is a sale

Each STP transfer is a redemption from the source fund, so each one creates a small capital gain. The equity side has no tax at the time of transfer; that comes only when you finally sell.

Liquid fund as the source. Units bought on or after 1 April 2023 count as a "specified mutual fund" (more than 65% in debt), so gains are taxed at your slab rate, however long you held them. ICICI Prudential AMC's 2026-27 tax reckoner lays this out under the Income-tax Act, 2025. There's no TDS on these gains for resident investors, so you show them in your ITR yourself. They're small, but they turn up in your AIS anyway, and the capital gains statement from CAMS or KFintech lists every transfer.

Arbitrage fund as the source. Taxed like equity. Units held 12 months or less give short-term gains at 20% (section 196 of the new Act), plus 4% cess. The ₹1.25 lakh exemption is only for long-term gains, so it doesn't help here.

In our ₹6 lakh example, liquid fund gains realised through the transfers come to ₹10,389 for the 6-month STP and ₹19,674 for the 12-month one. The tax, with 4% cess:

The arbitrage row assumes the same 6% as the liquid fund. Over the past year both categories have been roughly in the 6–7% range, but that moves up and down with short-term interest rates.

So in the 30% slab, an arbitrage fund saves about ₹2,000 on a 12-month STP of ₹6 lakh, or about ₹8,500 on ₹25 lakh. In the 20% slab or below, the liquid fund is as good or better, and simpler. Arbitrage funds have quirks too: many charge 0.25% if units are sold within 15 days (HDFC and ICICI Prudential cut this from 30 days in mid-2026), so set the first transfer after that window.

Stamp duty of 0.005% applies to every purchase, STP transfers included (Nippon India MF explains it): ₹30 on ₹6 lakh. Each transfer into the equity fund starts its own clock: 12 months for long-term tax, and often 12 months for the fund's exit load. See where your income lands on the income tax calculator before choosing the source fund.

What an STP fixes, and what it can't

What it fixes is regret. The worst case for a lumpsum is putting everything in the week before a fall, and an STP takes that off the table for the first few months. The waiting money earns liquid-fund returns, not savings-account interest. And because it runs on its own, there's no "market is too high, let's wait one more month", which is how many lumpsums never get invested at all.

That only works if you leave it running when the market falls. Those red months are exactly what the STP was set up for. Stop it then and you've paid for the protection and skipped the part that pays out.

What it can't fix: in a rising market, the more common case, it costs you, ₹55,467 over ten years in our steady example. Each transfer is a taxable sale from the source fund, and it all goes in your ITR. The source fund has to be from the same fund house, which narrows your parking choices. And it only protects the first few months. If the market falls 30% in year three, STP money falls just like a lumpsum.

6 months or 12 months?

For most people, somewhere between 6 and 12 months, monthly. Under 3 months adds very little protection. Beyond 12 months you mostly pay the cost of staying out of equity. 24- or 36-month STPs are usually fear dressed up as strategy.

Decide by the size of this money compared with what you already hold in equity:

• Small next to your existing equity (₹6 lakh when you already hold ₹30 lakh in funds): lumpsum, or a 3–6 month STP.
• Your first big equity money, or bigger than everything else you hold: 12 months. A crash in month two can put people off equity for good, and that does far more damage than ₹55,000 of lost return.
• Somewhere in between: 6 months is a sensible default.

Don't stretch the STP because "the market is at an all-time high". In a rising market, it often is. And daily or weekly transfers add little over monthly ones, except clutter in your capital gains report.

STP, SIP or plain lumpsum: match the tool to the money

A SIP is for money you will earn every month. Lumpsum and STP are for money you already have.

An STP doesn't replace your monthly SIP. Keep the SIP running and treat the STP as a separate, one-time job. For a bonus specifically, the post on putting a bonus in as lumpsum or SIP goes deeper, and SIP vs FD covers money you can't afford to see fall.

Filling in the form: a 12-month STP of ₹6 lakh

Here's the 12-month route from the tables above, done the way you'd actually do it on the fund house's app or website, MF Central, or your investing platform. A paper form at the branch asks for the same things.

1. Pick the equity fund first. That's the decision you'll live with for ten years; the STP is only the delivery route. Since both funds must be with one fund house, choosing the parking fund first and then taking whatever equity fund that house offers is how people end up in a mediocre one. Also be honest about the goal. If it's less than 5 years away (7 or more is better), this money shouldn't be going into equity at all, STP or no STP. Same for money you'd need if you lost your job or someone landed in hospital next month: that stays out of this.

2. Put the ₹6 lakh into that fund house's liquid fund. Or its arbitrage fund, if you're in the 30% slab and the amount is large. Don't reach for a credit risk or medium-duration fund for a little extra return. Those can fall, and the parking fund's only job is to stay boring. Once the units are allotted, you have a folio, and the STP is registered against it.

3. Source and target. "From" is the liquid fund, "to" is your equity fund. Check you've picked the right plan of the equity fund (direct or regular, growth or IDCW). It's an easy box to get wrong and an annoying one to fix later.

4. Type, amount, frequency, instalments. Fixed STP, ₹50,000, monthly, 12 instalments. For the 6-month route it's ₹1 lakh for 6. Both clear minimums like HSBC's 6 instalments easily.

5. Start date, and the exit-load window. Look up the exit load on both funds before picking the date. With an arbitrage fund, the first transfer has to fall after the 15-day window, or the units it sells pay 0.25%. On the equity side, each instalment starts its own 12-month exit-load clock, so this money is for leaving alone.

6. The leftover. Twelve transfers of ₹50,000 move your ₹6 lakh but leave the liquid fund's interest behind. Our tables counted it in the last transfer; in real life you have to move it yourself. Set a phone reminder for the month after the last instalment and switch it across.

7. Next July. Download the capital gains statement from CAMS or KFintech when you file your ITR. Every transfer is on it, and the gains go in at your slab rate.

After that, the only real work is not touching it. And years later, when the goal is two years off, the same form works the other way round: an STP from the equity fund into a liquid fund, a monthly slice at a time, so your child's college fees aren't sitting in equity the year they're due.

Written by the Gainly team 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. Contact