What a stock SIP is
A systematic investment plan, or SIP, is just a fixed purchase on a fixed date. In mutual funds it is the default: you pick a scheme and an amount, and units are bought every month. A stock SIP is the same idea applied to shares or ETFs. Most large Indian brokers offer it as a feature: you choose a stock or an ETF, a date, and either a rupee amount or a number of shares, and the broker places the buy order on that date with money from your linked account.
The habit is the point. Investing a fixed amount every month means you buy more shares when prices are low and fewer when they are high, which is called rupee cost averaging. More importantly, it means you invest at all, every month, without deciding each time. Monthly SIP contributions into Indian mutual funds reached ₹32,297 crore in August 2026, which shows how much of the country already invests this way.
Amount based or quantity based
| Amount based stock SIP | Quantity based stock SIP | Mutual fund SIP | |
|---|---|---|---|
| You fix | The rupees, say ₹5,000 | The number of shares, say 2 | The rupees |
| What you get | As many whole shares as fit; the rest stays as cash | Exactly that many shares | Fractional units, all of the money invested |
| Problem | A high priced share may buy zero | The amount debited varies with the price | You do not own the shares |
| Diversified | Only if you run several SIPs | Only if you run several SIPs | Yes, if it is a broad fund |
The whole share rule is the one most beginners miss. Suppose a stock trades at ₹2,700 and your SIP is ₹2,000 a month. It buys nothing. At ₹5,000 it buys one share and leaves ₹2,300 idle. An ETF with a low unit price, or a fixed quantity SIP, solves the rounding but not the bigger issue: one stock is one company.
What each instalment costs
Every stock SIP purchase is a separate delivery trade. It pays STT of 0.1% of the value, exchange and SEBI charges, stamp duty on the buy, GST on the charges and any brokerage your broker takes on delivery. Many brokers charge zero brokerage on delivery, so the total on a ₹5,000 buy is a few rupees. The bigger cost comes later, on sales: a flat depository charge each day you sell a stock, plus STT of 0.1% on the sale. The trade cost calculator shows every line for a given order.
A mutual fund SIP has no per trade charges in your hands. You pay the expense ratio instead, every year, on the whole accumulated amount. Over 20 years a small expense ratio on a large balance usually costs more in rupees than the per trade charges of a stock SIP, and a large expense ratio far more. It depends on the fund, which is why the comparison has to be made with real numbers, not labels.
Tax: every instalment is its own lot
Each monthly purchase is a separate lot with its own date. When you sell, the gain on each lot is short term if that lot was held 12 months or less, taxed at 20%, and long term if held longer, taxed at 12.5% above ₹1.25 lakh a year. Your broker's capital gains statement uses first in, first out: the oldest shares are treated as sold first. The same applies to mutual fund units bought by SIP.
The practical effect: a stock SIP running for three years has 36 lots. If you sell part of it, the early lots go first and are mostly long term, which is usually what you want. Keep the broker's statement; the capital gains tax calculator does the split on your own numbers.
Rupee cost averaging, honestly
Rupee cost averaging is often sold as a way to beat the market. It is not. When prices mostly rise, a lump sum invested on day one ends up ahead of the same money drip fed over a year, because more of it was invested earlier. What a SIP does well is behavioural: it removes the timing decision, keeps you investing through falls, and fits money that arrives monthly, which is how salaries arrive. The blog note SIP against lump sum shows both sides with numbers.
₹10,000 a month for 15 years is ₹18 lakh invested; at an illustrative 11% a year it would grow to roughly ₹45 lakh.
Illustration with a fixed yearly rate and monthly compounding, before costs and tax. Real returns vary every year.
The one lever you fully control is the amount. A SIP that never rises shrinks in real terms as prices and your income go up. Raising it each year with your salary does more for the end value than chasing a better return; the blog note the flat SIP shrinks and the step up SIP calculator show by how much.
Stock SIP, fund SIP, or a rules based portfolio
You own the shares, one name at a time
- Whole shares only; high prices round down
- Charges on each buy, DP fee on each sell day
- No expense ratio on a stock
- Diversified only through an ETF or many SIPs
The fund owns the shares for you
- Any amount, fractional units
- Expense ratio every year on the whole balance
- Diversified from the first ₹500 in a broad fund
- Fully automatic, nothing to place
There is a third option for money you add regularly: a rules based portfolio in your own demat, topped up on your own schedule. You get many stocks at the rule's weights, the shares are yours, and the rule handles which names to hold. It needs a starting minimum, and on RupeeCase there is no automatic monthly debit today: you add the money yourself. For pure set and forget SIP automation, an index fund fits better.
How to set up a SIP in stocks, step by step
- Decide what the SIP buysa broad ETF for diversification, or individual stocks only as part of a wider plan.
- Choose amount or quantityamount based for a fixed budget, quantity based for high priced shares.
- Set the date after your salary creditso the linked account always has the money.
- Check the chargesbrokerage on delivery, the DP charge on sells, and the minimum order your broker allows.
- Raise it once a yearstep the amount up with your income, ideally by a fixed percentage.
- Keep the lot statementeach instalment is a lot for tax; your broker's capital gains report tracks them.
Measuring a SIP's return properly
A SIP's return cannot be read off the gain divided by the money put in, because each instalment was invested for a different length of time. The right measure is XIRR, the yearly rate that accounts for the date of every cash flow. A SIP that has turned ₹3.6 lakh into ₹4.5 lakh over three years shows a 25% absolute gain, but at ₹10,000 a month its XIRR is about 15% a year, because the last instalments have had only weeks to grow. The XIRR calculator does it from your own dates and amounts, and the blog note on SIP XIRR against the absolute number explains the gap.
Common mistake: a SIP in one favourite stock
A stock SIP into one well known company feels safe because the company feels safe. But a single stock can fall 50% and take years to recover, or never recover, while the index carries on. Ten years of disciplined monthly buying into the wrong single name is ten years of discipline wasted. If you like the habit, point it at something diversified, and treat single stock SIPs as a small part of the plan, if at all.
How this shows up in RupeeCase
RupeeCase is built for the "rules based portfolio" route above: an index algo held stock by stock in your own demat, rebalanced on its calendar, that you can add to on any schedule you keep. Largecap Hybrid holds 21 positions, about 80% in a momentum rule on the Nifty 100 and 20% in debt, rebalanced every 4 weeks, from ₹1,25,000; its model CAGR is 22.74% with a deepest fall of −22.04%, as of 27 Apr 2026. Systematic investing for retail investors is explained on the retail solutions page, including when a fund SIP is the better fit.
Questions investors ask
Can I do a SIP in shares?
Yes. Most Indian brokers let you set up a stock or ETF SIP that buys a fixed amount or a fixed number of shares on a chosen date each month, into your own demat account.
Is a SIP in stocks better than a mutual fund SIP?
Neither is better in general. A stock SIP gives you the shares and no expense ratio, but buys whole shares only and is not diversified unless it is an ETF. A broad fund SIP is diversified from any amount and fully automatic, for a yearly expense ratio.
What is the minimum amount for a stock SIP?
The price of one share for a quantity SIP, or whatever minimum your broker sets for an amount SIP. If the amount is below the share price, an amount based SIP buys nothing that month.
How is a stock SIP taxed?
Each instalment is a separate lot. On sale, lots held 12 months or less are taxed at 20% on the gain and lots held longer at 12.5% above ₹1.25 lakh a year. Brokers treat the oldest lots as sold first.
Can I pause or stop a stock SIP?
Usually yes, from the broker's app, without any penalty, because each instalment is an ordinary purchase. The shares already bought stay in your demat.
Does RupeeCase offer SIPs?
Not as an automatic monthly debit today. You start an index algo from its minimum and add money yourself on any schedule you keep; the rule rebalances on its cadence. For pure SIP automation, an index fund fits better.