Everything you need to know about investment delay and compound growth.
Why does delaying investment cost so much?
The cost comes from compound interest working against you. When you invest
early, your returns earn returns — this snowballs exponentially over time. A delay doesn't just
cost you the returns on the money you didn't invest; it costs you the returns on those returns,
for every remaining year. The longer your horizon, the more devastating any early delay becomes
because the compounding chain is broken at its most powerful starting point.
What is the Rule of 72?
The Rule of 72 is a quick mental math shortcut: divide 72 by your annual return
rate to estimate how many years it takes to double your money. For example, at 12%
per year, 72 ÷ 12 = 6 years to double. At 8%, it takes 9 years. This shows why
higher returns and longer time horizons create dramatically larger wealth — every doubling cycle
multiplies your entire portfolio.
What is a SIP (Systematic Investment Plan)?
A SIP is a method of investing a fixed amount at regular intervals (typically
monthly) into a mutual fund or index fund. Instead of trying to time the market with a large
lump sum, a SIP averages your purchase cost over time — a strategy known as rupee/dollar cost
averaging. SIPs are particularly effective for salaried individuals because they automate
investing and remove the temptation to spend the money instead.
Does delaying by just 1 year really matter?
Yes — dramatically so. The first years of a long investment horizon are the most
valuable because those contributions compound for the longest time. A ₹10,000/month
SIP started 1 year later at 12% over 20 years loses roughly ₹3–4 lakh compared to starting now.
That single year of delay costs more than an entire year of total contributions — purely due to
lost compounding. Try changing the delay slider to 12 months to see your personal number.
What return rate should I use in the calculator?
Use a rate that matches your actual investment vehicle. As a rough guide: Fixed Deposits
/ Bonds: 5–7%, Debt Mutual Funds: 7–9%, Index Funds (Nifty 50 / S&P 500): 10–12%,
Large Cap Equity Funds: 10–14%, Mid/Small Cap Funds: 12–18%. For long-term planning, most
financial advisors recommend using 10–12% for a diversified equity portfolio and being
conservative rather than optimistic. Inflation-adjusted (real) returns are typically 4–8% lower
than nominal.
What is inflation-adjusted return and why does it matter?
Nominal returns tell you how much money you'll have. Inflation-adjusted (real) returns tell you
what that money can actually buy. If your portfolio grows at 12% but inflation
runs at 6%, your real return is roughly 6%. Over 20 years, ₹1 crore nominal might have the
purchasing power of only ₹30–40 lakh in today's rupees. Enable the inflation toggle in the
calculator to see your real projected wealth and make more grounded financial decisions.
SIP vs Lump Sum — which is better?
It depends on your situation. SIP is better when you have a regular income, you
want to avoid timing the market, or you're just starting out. Lump sum is better
when you have a windfall (bonus, inheritance), markets are clearly undervalued, or
your entire corpus is already sitting idle in a savings account. Use the "SIP + Lump" mode in
this calculator to model a combination — a common real-world strategy is a lump sum to
kickstart, followed by monthly SIPs.
What is the Annual Step-Up feature?
Step-up SIP means increasing your monthly investment by a fixed percentage every
year — for example, starting at ₹10,000/month and increasing 10% each year. This
aligns with typical salary growth and dramatically accelerates wealth creation. At 10% annual
step-up, a ₹10,000/month SIP grows to ₹25,937/month by year 10. Enable the Step-Up toggle in
Advanced Options to model this scenario.
I have existing debt — should I invest or pay it off first?
A common rule of thumb: if your debt interest rate is higher than your expected
investment return, pay off debt first. High-interest debt like credit cards
(18–36%) should almost always be cleared before investing. Low-interest debt like home loans
(7–9%) can coexist with investing since your expected equity returns likely beat the interest
rate. Medium-interest debt (personal loans at 12–15%) is the grey zone — often worth splitting:
partial debt repayment + partial SIP.
How accurate are these projections?
This calculator uses standard financial mathematics for illustrative purposes
only. Real-world returns fluctuate year to year — markets don't grow at a smooth
12% annually; they may rise 30% one year and fall 20% the next. Taxes (LTCG, STCG), fund expense
ratios (typically 0.1–1.5%), and platform fees are not modeled. Use the results as a directional
guide to understand the impact of time, not as precise forecasts. Always consult a
SEBI-registered financial advisor for personal planning.