What is a SIP?

SIP is short for Systematic Investment Plan. You instruct a mutual fund — usually via a broker, fund house, or your bank's app — to pull a fixed sum from your bank account on a chosen date each month and invest it in a selected scheme. 5,000 on the 5th of every month into a broad equity index fund is a SIP.

You do not try to time the market every payday. You buy more units when NAV is low and fewer when NAV is high. Over long periods, that cost averaging habit matters more than any single month's timing call.

What you actually own

Each instalment buys units of the fund at that day's NAV (subject to cut-off times and applicable loads). Your wealth is units × current NAV. If you own 1,200 units and NAV is 85, your holding value is 1,02,000. Tomorrow's NAV will differ.

Returns are not guaranteed. Equity funds can fall 30–40% in bad years and still recover over a decade. Debt funds behave differently but are not risk-free — credit risk and interest-rate risk still exist. Liquid funds are for parking, not for 20-year goals.

How to start a SIP in

Complete KYC (PAN, Aadhaar, bank account). Pick a platform — direct plans via AMC websites or platforms like Groww have lower expense ratios than regular plans sold through distributors. Choose a scheme category matching your goal horizon: equity for 7+ years, hybrid for 5–7 years, debt/liquid for under 3 years.

Set the SIP date close to your salary credit — 3rd, 5th, or 10th are popular. Register a bank mandate (e-NACH). The amount auto-debits until you pause or cancel.

example (illustrative, not a promise)

10,000 a month for 15 years at an assumed 12% annualised return projects to roughly 50 lakh on paper — far above the 18 lakh you contributed. Change the return assumption to 10% and the corpus drops to about 41 lakh. At 8%, it is roughly 34 lakh.

That sensitivity is why you should always run a range on the SIP calculator, not a single optimistic rate copied from a fund's best-year factsheet.

SIP vs lump sum

A lump sum invests everything on day one. A SIP spreads entry over months. Lump sum wins if the market rises steadily after you invest. SIP wins psychologically and mathematically when the market dips early in your tenure — you accumulate more units cheaply.

Many salaried people do not have a lump sum to deploy. SIP matches how income actually arrives — monthly. Compare paths with the lumpsum calculator and SIP calculator side by side.

SIP vs "stock tips from a WhatsApp group"

SIPs sit inside regulated mutual funds with regulator oversight, scheme information documents, daily NAVs, and exit rules. They are still market-linked investments. Read the SID, check the expense ratio and riskometer. Past returns in a factsheet are history, not a promise.

Direct plans save 0.5%–1% in annual expense ratio vs regular plans. Over 15 years on a 10,000 monthly SIP, that difference can mean lakhs.

Common setup choices

Date of debit: Align with salary credit so the SIP runs before discretionary spending.
Amount: Start with what you can continue through rough months — 2,000 sustained beats 10,000 cancelled after six months.
Category: Equity for retirement and child's education 10+ years out. Debt for goals under 3 years.
Step-up SIP: Raise the amount 5%–10% each year as salary grows. A 5,000 SIP stepped up 10% annually for 15 years at 12% projects to a larger corpus than a flat 5,000 — because contributions grow with income.

Compare with fixed deposits in SIP vs FD. For the maths of growth, see power of compounding.

Taxes and exits (high level)

Capital gains tax treatment depends on fund type and holding period under prevailing tax law — which has changed (old LTCG rules, new STCG/LTCG slabs). Equity fund gains held over 12 months and debt fund rules differ. Do not plan exits from a calculator screen alone; check current rules on the IT department website or with a tax adviser.

ELSS (tax-saving) funds have a 3-year lock-in. Other equity funds can be redeemed any business day, with proceeds in 2–3 working days.

More tools: FD calculator. Hub: SIP calculator guide.

Pause, stop, and restart

Most platforms let you pause an SIP for one to six months without cancelling the mandate. Use pause during genuine cash stress — not during market fear. Restarting is one tap; re-entering the market after panic-selling is emotionally harder.

NAV cut-off times

Investments before 3 PM on a business day typically get the same day's NAV for equity funds; after 3 PM, next business day. SIP debits that fail due to insufficient balance skip that month — set up a low-balance alert on your salary account.

Systematic Withdrawal Plan (SWP) — the reverse

After building a corpus, SWP lets you withdraw a fixed sum monthly while the rest stays invested. Retirement income often pairs accumulated SIP corpus with SWP rather than redeeming everything on day one. Different tool, same discipline — fixed amount, automatic execution.

Disclaimer: Investments are subject to market risks. This is education, not investment advice or a fund recommendation.