What is SIP and how does it work? With SIP calculator

A Systematic Investment Plan (SIP) is a method of investing in mutual funds where an investor commits to investing a fixed amount at regular intervals (monthly or quarterly).

SIPs have seen massive adoption in India due to low entry point (SIPs can start from as low as ₹100 per month), enabling automatic and disciplined investing suitable for salaried individuals, reducing timing risk, and encourages long-term wealth creation.

As per industry data, monthly SIP inflows in India in December 2025 is over Rs 30,000 crores per month, highlighting strong investor trust in this investment route.

SIPs are flexible and convenient. You can, start, pause, modify, or stop SIP anytime, increase SIP amount via Step-Up SIP, and choose from multiple mutual fund categories.

In this article, we will cover the below topics:

What is SIP?

How does SIP work?

Things to consider before starting an SIP

How to start an SIP?

SIP calculator

What is SIP?

SIP is a method of investing, not an investment product itself. They money invested through SIP is deposited in a mutual fund which is used to buy shares from the stock market depending upon the scheme.

For example, if you invest ₹10,000 per month through SIP in an equity mutual fund, the amount is automatically debited from your bank account and invested at the prevailing Net Asset Value (NAV) to buy a specific number of units in a mutual fund. These units historically went up in value over long durations thus creating wealth in the process.

SIP is ideal for, first-time investors, salaried professionals, long-term wealth creators, investors planning for retirement, children’s education, or house purchase, and anyone looking to reduce market timing risk. Instead of investing a lump sum amount, SIP spreads investments over time.

SIP gives the flexibility to invest small amounts, change amounts, top up when required and set up an auto pay on your UPI app or bank account.

SIPs are regulated by Securities and Exchange Board of India (SEBI), ensuring transparency and investor protection. Most mutual funds are professionally managed by investment professionals possessing deep market knowledge and strong research capabilities.

SIPs enable you to spread the risk of market fluctuations since it is invested over a period. SIPs can be started with as low as ₹ 100 to any number of your choice.

The SIP amount depends on your income, financial goals, time horizon and risk appetite. A commonly followed trend is investing at least 10%–20% of monthly income, gradually increasing it via step-up SIPs. The longer the SIP duration, the better the outcome—especially for equity funds. Stopping SIP during market corrections is usually counter-productive.

SIPs are available across equity funds, debt funds, hybrid funds, and index funds in India. SIP works best in equity-oriented mutual funds, especially, Large Cap funds, Flexi Cap funds, Index funds, ELSS (Tax-Saving mutual funds) and aggressive Hybrid funds. Debt fund SIPs are also used for short-term goals, but the real wealth-creation potential lies in equity SIPs over long durations.

Mutual funds in India are stored either electronically in a Demat account with a Depository Participant (DP) or, more commonly, as a Statement of Account (SoA) directly with the Asset Management Company (AMC). Records are maintained by Registrar and Transfer Agents (RTAs) like CAMS or KFintech.

Asset Management Companies include ICICI Prudential AMC, HDFC AMC, UTI, Mirae Asset Management, SBI AMC etc. Mutual fund distributors include larger ones such as SBI Securities, to a smaller one person in your locality. Mutual fund distributors are certified by Association of Mutual Funds in India (AMFI).

You can partially or fully redeem mutual fund units at any time and money will be credited into your bank account within 2-3 working days. For most retail investors in India, SIP is a more practical and safer approach, especially in equity mutual funds.

How does SIP work?

When you start an SIP, the money invested each time is used to buy units (NAVs) of a specific mutual fund. The value of NAVs will go up if the fund is performing well and vice versa.

Some of the popular schemes within equity mutual funds include:

Index funds – where SIPs are channelled into buying units (NAV) of an index such as Nifty 50 or Mid Cap Index. This is a passive investing methodology and is suitable for first time investors and risk-averse investors who need market level returns.

Large Cap mutual funds – where SIPs are used to buy units of a fund that invests in shares only of large cap shares. This fund is less volatile and more predictable.

Multi cap mutual funds - invest across large cap, mid cap, and small cap stocks, as defined by SEBI, with a minimum allocation of 25% each to large, mid, and small cap companies.

Flexi Cap mutual funds - Flexi cap mutual funds invest across large cap, mid cap, and small cap stocks with complete flexibility in allocation, as defined by SEBI. Unlike multi cap funds, there is no minimum investment requirement for any market-capitalisation segment, allowing fund managers to dynamically adjust portfolios based on market conditions and opportunities.

Banking & Financial Services funds – where SIPs are used to buy only shares of banks.

Small Cap mutual funds – where SIPs are used to buy units of a fund that is invested only in small cap companies.

When you invest through a SIP, you select a mutual fund scheme of an AMC based on your risk appetite, investment capacity and financial goals. Then you choose the SIP amount (e.g., ₹1,000, ₹5,000, ₹10,000 or any amount). You also decide the frequency of SIP deposit (monthly is most common). Mutual fund units are allotted to you based on the fund’s NAV on the SIP date. NAVs change every day by a small value.

Since NAV changes daily, SIP ensures you buy more units when markets are low and fewer units when markets are high. This process is called rupee cost averaging.

When NAV, which is the value of one mutual fund unit, increases you will receive fewer units for your monthly SIP amount. Likewise, when the value of NAV decreases, you will receive more units of the mutual fund. For example, if you invest ₹ 5,000 every month where the NAV value as of today is ₹ 100, you will receive 50 units. Whereas if the NAV value increases to 150, you will receive 33 units. Over time, the cost averages out and hence defines rupee cost averaging.

Example of SIP

Suppose you invest ₹10,000 per month in an equity mutual fund for 10 years (120 months):

Total investment: ₹12,00,000

Expected annual return: 12% (conservative)

Estimated corpus after 10 years: ₹23–25 lakhs

This demonstrates the power of compounding, one of the biggest advantages of systematic investment planning.

SIPs can be customized depending upon your goals and cashflow. Some flexibility include:

Regular SIP is the most common SIP where a fixed amount is invested at fixed intervals. This can be for a year, 3 years, 5 years, 10 years or even more. This is ideal for disciplined investing over a long-term horizon.

Step-Up SIP (Top-Up SIP) allows you to increase SIP amount annually or periodically. A step-up SIP provides investors facility to slowly increase their SIP instalment amount at pre-determined intervals. You can begin SIP with a fixed amount and opt for a regular top-up on it.

Over a 10-year period with an assumed 14% annual return, a normal SIP of ₹10,000 per month results in a total investment of ₹12 lakhs and grows to approximately ₹26.2 lakhs. In comparison, a 10% annual step-up SIP, starting at the same ₹10,000 per month and increasing every year, leads to a total investment of about ₹19.1 lakhs but grows to nearly ₹37.5 lakhs.

Despite investing only around ₹7 lakh more, the step-up SIP generates an additional ₹11+ lakh in final wealth, making the corpus roughly 43% higher than a fixed SIP. This clearly shows that gradually increasing SIP amounts in line with income growth significantly enhances long-term wealth creation through compounding.

Flexible SIP option is similar to regular SIP option but still has a difference. It allows an investor the opportunity to increase or decrease the investment amount as per his or her financial situation. The regular contribution of the investor can be adjusted according to the cashflow. Sometimes, some fund houses even give an option to change the intervals as per the financial crunch. The investor has to be communicated to the fund houses for the change and should be done one week prior to the next due date of SIP.

Trigger SIP is when investments are triggered based on market levels, NAV, or index movements (suitable for experienced investors). A trigger SIP option allows investors to set triggers depending on when a specific event occurs in the market. It can be pre-defined trigger prompting, when the market suddenly dips or has a favourable condition, a specific index level or even a net asset value of the units. An investor can start a SIP, redeem units or switch to another plan. It is suitable for investors who understands the dynamic nature of the market as it is based on speculations.

Value averaging investment plan (VIP) investment plan is similar to conventional SIP where an investor makes higher investments when the market dips to buy more units. Though, it buys more when the market is low, it may result in higher returns, investors would require a lot of liquid cash with them to enrol for a VIP. This is because investors will have to make extra investments whenever there is a big fall the in the market. This lack of predictability is one of the main reasons why many average investors do not opt for VIP and is usually suitable for HNIs.

Multiple SIP (Multi Select SIP) is a unique SIP offering that allows investor to invest across multiple mutual funds from one fund house with a single SIP facility. With one SIP, an investor can diversify the investment portfolio as the money is automatically distributed into multiple schemes. It also reduces the paperwork for managing multiple SIPs together.

Things to consider before starting an SIP

Define your investment goal and time horizon

Before starting an SIP, identify your financial goal and investment duration. Equity mutual fund SIPs are suitable only for long-term goals of 5–7 years or more, as markets can be volatile in the short term. Short-term goals should ideally be funded through debt or hybrid funds rather than pure equity.

Choose the right mutual fund category

Each mutual fund category carries a different risk profile. Large cap funds offer stability, mid and small cap funds provide higher growth with higher volatility, while flexi cap funds allow dynamic allocation across market segments. Investors should compare funds only within the same category, not across categories.

Check the Expense Ratio (TER)

The Total Expense Ratio (TER) is the annual fee charged by the mutual fund house. It is deducted from your investment regardless of market performance. Even a 1% higher TER can reduce long-term wealth substantially. Investors should prefer direct mutual fund plans, which have significantly lower expense ratios compared to regular plans.

Understand Exit Load structure

Most equity mutual funds charge an exit load of around 1% if redeemed within one year. Each SIP instalment has its own exit-load timeline, meaning units invested every month complete one year separately. Understanding this helps avoid unnecessary charges during withdrawals.

Analyse Rolling Returns instead of past rankings

Do not select SIP funds solely based on recent one-year returns or top performer lists. Instead, analyse 3-year, 5-year, and long-term rolling returns. Consistent performance across market cycles is far more important than short-term outperformance.

Review Fund Manager track record

A stable and experienced fund manager adds long-term consistency. Prefer funds where the manager has been in charge for at least one full market cycle. Frequent fund manager changes may affect investment strategy and performance.

Evaluate AUM size and portfolio overlap

Funds with extremely small AUM may face stability risks, while very large funds can struggle with agility. An ideal AUM range ensures efficient fund management. Additionally, avoid investing in multiple mutual funds with high portfolio overlap, as this reduces diversification.

Understand taxation on SIP investments

For equity mutual funds, short-term capital gains tax (held under 1 year) is 15%. For long-term capital gains (held over 1 year) its 10% tax on gains above ₹1 lakh per year.

ELSS mutual funds offer tax benefits under Section 80C, but come with a mandatory 3-year lock-in period.

Choose a sustainable SIP amount

Select an SIP amount that can be comfortably maintained during market ups and downs. It is advisable to keep an emergency fund of at least six months’ expenses before starting equity SIPs. Gradually increasing investments through a step-up SIP can significantly enhance long-term corpus.

A successful SIP strategy is not about timing the market or chasing the best-performing fund. Long-term wealth creation depends on time horizon, low costs, diversification, tax awareness, and disciplined investing. When these factors are aligned, SIPs can become one of the most powerful tools for achieving financial goals.

How to start a SIP?

SIPs can be started through mutual fund distributors, brokerages, SEBI-registered distributors or directly with the Asset Management Company (AMC) website or app.

To start a SIP, you need, PAN card, KYC compliance (via registered intermediaries), bank account and mutual fund scheme selection. Before investing, you must complete your Know Your Customer (KYC) process. This can be done online using PAN, Aadhaar, and bank details.

Select an amount you can invest comfortably every month. SIPs can start from as low as ₹100. Choose a monthly or quarterly frequency based on your income pattern.

Pick a convenient debit date and decide how long you want to invest. SIPs work best when continued for the long term to benefit from compounding.

Submit the SIP request online through the mutual fund platform you chose. Set up auto-debit instructions so the investment happens automatically every cycle.

Check your portfolio several times a year. If your goals or income change, you can increase your SIP amount or switch funds if required.

SIP Calculator

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Frequently Asked Questions (FAQs) on SIP

1. Can I stop or pause my SIP anytime?

Yes, SIPs are flexible. You can stop, pause, or modify them anytime without penalties.

Is SIP better than FD?

Over the long term, equity SIPs have historically delivered higher returns than fixed deposits, though they come with market risk.

Are SIP returns guaranteed?

No. SIP returns depend on market performance and the mutual fund chosen.

Is SIP safe during market crashes?

Market crashes actually benefit SIP investors due to lower NAVs and higher unit accumulation.

Can NRIs invest in SIPs in India?

Yes, NRIs can invest in SIPs subject to KYC and FEMA regulations.

What is the best SIP duration?

For equity funds, 5 years or more is considered ideal.

Is SIP taxable every month?

No tax is deducted monthly. Tax applies only when units are redeemed.

Can I run multiple SIPs?

Yes. Investors can run multiple SIPs across different funds and goals.

Which is the best mutual fund for SIP?

There is no single “best” fund. The right fund depends on your risk appetite, goal, and time horizon.