Each monthly instalment compounds at the assumed monthly rate for whatever time remains until the tenure ends. Summed across all 240 instalments, that is the future value of an ordinary annuity: FV = M × [((1 + i)ⁿ − 1) / i] × (1 + i), where M is the monthly investment, i is the monthly rate (annual rate ÷ 12 ÷ 100), and n is the number of months.

Plugging in your numbers — M ≈ ₹10,000, i ≈ 0.010000, n = 240 — and working through the formula is what produces the ₹99,91,479 figure used throughout this page. Total invested is simply M × n = ₹24,00,000; the gap between that and the final value, ₹75,91,479, is the estimated growth attributable to the assumed 12% return compounding on each instalment for its own remaining time in the market.

• Total invested (principal via SIP): ₹24,00,000 across 20 years.
• Estimated returns (growth component): ₹75,91,479 — about 316% of what you invested, under the stated assumption.
• Estimated final value: ₹99,91,479 (invested plus estimated returns).

This page models a flat, unchanging monthly instalment — a regular SIP. Fund platforms generally offer two other variants worth knowing about:

A step-up SIP starting at the same ₹10,000 but rising 10% every year would out-accumulate this page's flat-instalment estimate by the end of 20 years, simply because later years contribute a larger monthly amount. You can approximate that scenario by periodically raising the monthly figure in the calculator above and comparing the resulting maturity values.

Sometimes the more useful question is not "what will ₹10,000 a month become?" but "how much do I need to invest to hit a specific number?" Using the same 12% assumption and 20-year horizon, reaching a round target of about ₹2,00,00,000 would need a monthly SIP of roughly ₹20,000 — noticeably different from the ₹10,000 used elsewhere on this page, which is exactly why goal-based planning should start from the target amount rather than from whatever figure feels comfortable to commit today.

This kind of reverse calculation matters most for named goals — a child's education corpus, a down payment, a retirement number — where the end amount is fixed by real-world costs and the only open question is how much monthly discipline gets you there. Run the same logic in the calculator above by nudging the monthly amount until the projected maturity matches your target.

Every SIP instalment counts as its own separate investment for holding-period purposes, so a single SIP can straddle both short-term and long-term tax treatment depending on when you redeem. For equity-oriented funds, units held over 12 months get long-term (LTCG) treatment, typically at a preferential rate above an annual exemption threshold; units held 12 months or less are short-term (STCG) and taxed at a higher flat rate. For debt-oriented funds, under rules effective from April 2023, most gains — regardless of holding period — are added to your income and taxed at your slab rate, with no indexation benefit.

Rates, thresholds, and even fund-category definitions have changed materially in recent budgets and can change again — do not assume the figures above still apply on the day you actually redeem. Confirm the current-year capital gains rules with a chartered accountant or your fund's statement of account before filing.

A mutual fund SIP is one of several ways Indians build wealth through regular contributions. Broadly, here is how it compares with a few common alternatives:

None of these is universally better — a well-built plan often uses more than one, matched to each goal's time horizon and how much of a balance dip you can tolerate before it recovers. EasyCal's PPF and FD calculators use the same input-driven approach as this page if you want to model those alternatives side by side.

• Complete KYC once (Aadhaar/PAN-based e-KYC) through any registered mutual fund platform, registrar and transfer agent (RTA), or the fund house directly — it then works across every fund house.
• Pick a fund category matched to your goal and horizon — equity for long-term growth where you can tolerate drawdowns, debt or hybrid funds for shorter horizons or a lower tolerance for volatility.
• Prefer a direct plan over a regular plan if you are comfortable choosing funds yourself — direct plans skip distributor commission, which compounds into a meaningfully larger corpus over long tenures purely from the lower expense ratio, with no difference in the underlying portfolio.
• Set up an e-mandate (NACH or UPI Autopay) so the instalment debits automatically on a fixed date — automation is what makes "regular" investing actually regular, since it removes the monthly decision to transfer money by hand.
• Revisit the mandate once a year against your income and goals — a natural checkpoint to consider a step-up rather than leaving the instalment flat for a decade while your income rises.
• Keep your folio consolidated under one PAN and email ID across fund houses — it makes annual statements, tax reporting, and nominee updates far simpler than scattering investments across many logins.

Same SIP, different horizons

Holding the monthly contribution and rate constant, here is how maturity changes at 5, 10, 15, and 20 years.

Same tenure, different monthly amounts

Roughly ±15–25% around ₹10,000 a month — useful for "what if I step up my SIP?" thinking.

As a mental-model contrast — not a quote — consider a purely illustrative fixed-income return of 7%: at the same ₹10,000 a month for 20 years, a simplistic FD-style path would land near ₹52,39,654 under that alternate assumption, against ₹99,91,479 under the 12% SIP assumption used everywhere else on this page. Equity SIPs are not FDs and carry a different risk profile, but this contrast is why "SIP vs FD" comes up so often when people plan around a fixed number.

• Stopping the SIP the moment markets fall — volatility during accumulation is exactly what lets rupee-cost averaging buy more units at lower prices.
• Picking a fund on trailing 1-year returns alone instead of consistency across market cycles and the fund's stated mandate.
• Running many small, near-identical SIPs instead of a focused, genuinely diversified handful — more folios rarely means more diversification.
• Ignoring the expense ratio gap between direct and regular plans, which quietly compounds against you over 20 years.
• Treating the assumed 12% return as a promise instead of a planning input — rerun this page with a more conservative rate before committing to a large future goal.
• Redeeming the whole corpus in one shot at the goal date instead of gradually de-risking into debt funds or a systematic transfer plan in the last 1–3 years.