A Systematic Investment Plan (SIP) is the simplest way to build long-term wealth from a regular salary. Instead of timing the market with a lump sum, you commit a fixed amount every month, let compounding do the heavy lifting, and ride out short-term volatility. This SIP Calculator shows you exactly what that discipline produces — your maturity amount, your total contribution, and your estimated gains — for any combination of monthly investment, expected return, and duration.
Use it to plan a retirement corpus, a downpayment, your child's education, or simply to see what $5,000 a month becomes over 20 years. Toggle between INR and USD if you invest in mutual funds in either country.
What is a SIP?
A Systematic Investment Plan is a method of investing a fixed sum into a mutual fund at regular intervals — almost always monthly. The fund house auto-debits your bank account, buys mutual fund units at that day's Net Asset Value (NAV), and credits them to your folio. Over months and years those units compound — both through fund performance and through reinvested gains.
SIPs work across equity, debt, hybrid, and ELSS (tax-saving) mutual funds. They are the default investment vehicle for most salaried investors in India and a popular automated approach for index-fund investors in the United States.
How does a SIP work?
On your chosen SIP date each month, three things happen automatically:
- Auto-debit. Your bank deducts the SIP amount and forwards it to the fund house.
- Unit allocation. The fund house buys units at that day's NAV. If NAV is low you receive more units; if NAV is high you receive fewer — this is rupee cost averaging in action.
- Compounding. Existing units continue to appreciate (or depreciate) with the market. Over years, gains are earned on previous gains — the multiplier that makes long-running SIPs powerful.
Because both the investment and the compounding repeat month after month, the result is non-linear: a 20-year SIP doesn't produce twice the corpus of a 10-year SIP — it can produce four or five times as much.
The SIP formula
The future value of a SIP is calculated using the annuity future-value formula:
- FV — future value (maturity amount)
- P — monthly investment amount
- r — monthly rate of return (annual rate ÷ 12 ÷ 100)
- n — total monthly contributions (years × 12)
This calculator uses an iterative monthly-compounding approach — at the end of every month it adds the new contribution to the running balance, multiplies the total by (1 + r), and stores the year-end snapshot for the growth table. The result matches the closed-form formula above and accounts correctly for the timing of each contribution.
Worked example: $5,000 monthly for 10 years at 12%
Plug in:
- P = $5,000
- annual rate = 12% → r = 12 ÷ 12 ÷ 100 = 0.01 (1% per month)
- n = 10 × 12 = 120 months
Substituting into the formula:
- Total invested: $5,000 × 120 = $6,00,000
- Estimated gains: $5,61,695
- Your money nearly doubled — earned by sitting still.
How to use this SIP calculator
- Enter your monthly investment. Start with what you can sustain — even $1,000 a month over 25 years is substantial. Round numbers are easier to commit to.
- Set the expected annual return. For Indian equity SIPs, 11–13% is a defensible long-term assumption. For US index-fund SIPs, 7–9%. For debt funds, 5–7%.
- Choose the duration. Longer is better — SIPs reward patience non-linearly. Aim for 15–25 years for goals like retirement.
- Switch currency if needed. The INR/USD toggle changes the display format; the math is identical.
- Read the breakdown. The maturity amount is your projected corpus, total invested is what came out of your pocket, and the difference is what compounding earned for you.
Real-life SIP scenarios
Scenario 1 — The 25-year-old first-jobber
Aanya starts a $3,000/month SIP at age 25 in an index mutual fund averaging 11%. By the time she's 60, her corpus is approximately $1.4 crore (≈ $14,000,000) — from a total contribution of just $12.6 lakh. Compounding did the rest.
Scenario 2 — The 35-year-old mid-career professional
Rohan is 35, earning well, and wants $2 crore by age 60. He'd need roughly $19,000/month at 12% for 25 years. If he can step up the SIP by 10% each year, he can start with $10,500/month and still hit the target.
Scenario 3 — The 45-year-old late starter
Priya is 45 and has 15 years to retirement. To accumulate $1 crore at 12%, she needs about $20,500/month. The window is shorter, so the monthly cost is higher — a reminder that the cheapest way to invest is to start early.
SIP returns at different durations ($5,000 / month @ 12%)
| Duration | Total Invested | Maturity Value | Gains Earned | Wealth Multiplier |
|---|---|---|---|---|
| 5 years | $3,00,000 | $4,12,432 | $1,12,432 | 1.37× |
| 10 years | $6,00,000 | $11,61,695 | $5,61,695 | 1.94× |
| 15 years | $9,00,000 | $25,22,880 | $16,22,880 | 2.80× |
| 20 years | $12,00,000 | $49,95,740 | $37,95,740 | 4.16× |
| 25 years | $15,00,000 | $94,88,175 | $79,88,175 | 6.33× |
| 30 years | $18,00,000 | $1,76,49,569 | $1,58,49,569 | 9.81× |
The wealth multiplier — the ratio of final value to total invested — accelerates sharply after year 15. This is the compounding curve that makes a buy-and-hold SIP one of the best wealth-building tools available to retail investors.
Monthly SIP needed for popular financial goals
| Goal | Target | Horizon | Expected Return | Required Monthly SIP |
|---|---|---|---|---|
| Emergency fund | $3,00,000 | 3 years | 8% | $7,400 |
| International vacation | $5,00,000 | 5 years | 12% | $6,100 |
| Car downpayment | $10,00,000 | 7 years | 10% | $8,200 |
| Home downpayment | $20,00,000 | 10 years | 11% | $8,800 |
| Child's education | $25,00,000 | 15 years | 12% | $5,000 |
| Retirement corpus | $1,00,00,000 | 25 years | 12% | $5,300 |
SIP vs Lump Sum vs Recurring Deposit vs PPF
| Feature | SIP (Mutual Fund) | Lump Sum (Mutual Fund) | Recurring Deposit | PPF |
|---|---|---|---|---|
| Asset class | Equity / Debt / Hybrid | Equity / Debt / Hybrid | Bank deposit | Government scheme |
| Expected returns | 10–15% (equity) | 10–15% (equity) | 5–7% | 7.1% (FY 2025-26) |
| Risk | Market-linked | Market-linked + timing risk | None | None (sovereign) |
| Lock-in | None (ELSS: 3 yr / installment) | None (ELSS: 3 yr) | Until maturity | 15 years |
| Tax (India) | LTCG 12.5% above ₹1.25 L (equity) | Same as SIP | Slab rate | EEE — fully tax-free |
| Best for | Long-term wealth, salaried investors | Idle corpus, market corrections | Conservative short-term savers | Tax-free conservative core |
Best mutual fund categories for SIP
| Fund Category | Risk | Ideal Horizon | Typical Returns | Best For |
|---|---|---|---|---|
| Large-cap equity | Moderate | 5+ years | 10–12% | Steady core wealth building |
| Flexi-cap / multi-cap | Moderate | 7+ years | 11–14% | Diversified equity exposure |
| Mid-cap | Moderately high | 7+ years | 12–15% | Long-horizon growth investors |
| Small-cap | High | 10+ years | 13–17% | Aggressive, long-window investors |
| Index (Nifty 50, S&P 500) | Low–moderate | 5+ years | 8–11% | Passive, low-fee investors |
| ELSS (tax-saving) | Moderate | 3+ years (lock-in) | 10–13% | Section 80C tax savers |
| Hybrid / balanced advantage | Moderate | 4+ years | 9–12% | Lower-volatility growth |
| Debt (short / corporate) | Low | 1–3 years | 6–8% | Short-term goals, parking cash |
Tax on SIP returns (India, FY 2024-25 onward)
- Equity mutual funds (≥ 65% equity). Long-Term Capital Gains (held over 12 months) above an annual exemption of ₹1.25 lakh are taxed at 12.5%. Short-Term Capital Gains (sold within 12 months) are taxed at 20%. For SIPs, each monthly installment has its own holding period — units bought today qualify for LTCG only 12 months from today.
- ELSS funds. Same tax treatment as equity funds, but each installment is locked in for 3 years from its purchase date. Eligible for Section 80C deduction up to ₹1.5 lakh per year (old tax regime only).
- Debt mutual funds (post April 2023). All gains are taxed at your income-tax slab rate, regardless of holding period — the previous indexation benefit was removed.
- Hybrid funds. Taxed as equity if equity allocation is ≥ 65%, otherwise as debt.
Tax law changes often — verify slabs and limits with the Income Tax Department before filing. For US investors, mutual fund distributions are taxed as ordinary income or qualified dividends; consult a CPA for your situation.
Common SIP mistakes to avoid
- Stopping SIPs in market downturns. This is the single most expensive mistake. Downturns are when your SIP buys the most units — staying invested is what produces the eventual outperformance.
- Choosing funds purely on 1-year returns. Recent winners often mean-revert. Look at 5- and 10-year rolling returns, fund-manager tenure, and expense ratio.
- Spreading across too many funds. 3–5 well-chosen funds is usually enough (one large-cap, one flexi-cap, one mid / small-cap, optionally one international, one debt). Twelve funds become impossible to track.
- Not stepping up the SIP with salary growth. If your income rises 8% a year but your SIP stays flat, you're effectively saving less each year.
- Ignoring expense ratios. A 1% higher expense ratio can shave 15–20% off your 25-year corpus. Prefer direct plans over regular plans; prefer index funds over high-fee active funds where appropriate.
- Pausing SIPs for short-term liquidity needs. SIPs work because they're automatic. If you need cash, prefer redemption over cancellation — the SIP keeps running.
- Misaligning fund type with horizon. Don't put 1-year goal money in small-cap equity, and don't park 25-year retirement money entirely in debt funds.
- Not reviewing the portfolio annually. Once a year, check fund performance against the benchmark, rebalance if allocations have drifted, and exit serial underperformers.
SIP myths vs reality
- Myth: "SIPs are only for small amounts." Reality: many investors run SIPs of $50,000+ per month. The format is flexible.
- Myth: "SIPs guarantee returns." Reality: SIPs guarantee discipline. Returns depend on the underlying market.
- Myth: "I should time the SIP date around market lows." Reality: over a 10+ year horizon, the SIP date barely matters. Auto-debit on any working day.
- Myth: "I should stop SIPs when markets fall." Reality: the opposite — falling markets are when SIPs buy the most units at the cheapest prices.
- Myth: "SIPs are mainly for retirement." Reality: SIPs work for any horizon-matched goal — a vacation in 3 years, a downpayment in 7, retirement in 25.
Tips to maximize SIP returns
- Start early. The first 10 years of compounding do disproportionate work.
- Stay invested through cycles. The investors who do worst are the ones who panic-sell and try to re-enter.
- Step up annually. A 10% annual increase nearly doubles your final corpus over 25 years.
- Use direct plans. Lower expense ratio = more compounding in your pocket.
- Match the fund to the goal. Short-horizon money in debt; long-horizon money in equity.
- Automate everything. Make the SIP and the step-up automatic so you can't talk yourself out of it.
Related calculators
- Step-Up SIP Calculator — model annual SIP increases and see the corpus jump.
- Lumpsum Investment Calculator — compare with a one-time investment of the same capital.
- CAGR Calculator — work out the underlying compound annual growth rate.
- Compound Interest Calculator — pure compounding without monthly contributions.
- FD Calculator — compare guaranteed bank returns.
- PPF Calculator — tax-free government-backed corpus.
- Inflation Calculator — adjust your target for purchasing-power erosion.
- Personal Finance Planner — full retirement and goals dashboard.
The bottom line
A SIP is not a magic trick — it's a habit. Pick a sensible fund, automate a monthly amount you can sustain for a decade, step it up with your salary, and resist the urge to interfere. The SIP Calculator above gives you a clear-eyed view of where that habit leads. The hardest part isn't the math; it's the patience.