SIP Calculator — Step-Up SIP & Lumpsum Returns (2026)

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The Annuity-Due Formula Behind Your SIP Projection

This calculator projects your SIP using FV = P × [((1+i)^n − 1) ÷ i] × (1+i), where P is your monthly amount, i is the monthly rate (annual return ÷ 12), and n is the number of months. The trailing (1+i) factor is what makes it annuity-due rather than the plainer ordinary-annuity version — it assumes each installment is invested at the start of its month rather than the end, giving that month's contribution one extra period of compounding, which matches how most SIP mandates actually debit and invest.

Step-Up SIP: Small Annual Increases, Large Long-Term Gap

A flat SIP invests the same amount every month for the full period; a step-up SIP raises that amount by a fixed percentage each year, typically to track a salary increment. Because the largest contributions under a step-up plan land in the later years and still compound for whatever time remains, a 10% annual step-up builds substantially more final wealth over a long horizon than the identical starting SIP kept flat. Toggle step-up above to compare both paths using your own monthly amount and timeline.

Nominal Corpus vs What It's Actually Worth Later

The headline maturity number is nominal — it doesn't account for prices rising over the same period. The inflation-adjustment toggle divides that nominal figure by (1 + inflation)^years to show its value in today's rupees, which matters for goal-based planning: a ₹1 crore target for a 20-year-away goal means something very different once inflation is factored in than the raw number suggests.

What is a SIP and how does this calculator work?

A Systematic Investment Plan (SIP) is a way of investing a fixed amount in a mutual fund at regular intervals — usually every month — instead of a one-time lumpsum. This SIP calculator projects your future corpus using the annuity-due compound interest formula, assuming each installment is invested at the start of the month and compounds monthly at your chosen expected return. Enter your monthly amount, expected annual return, and investment period, and the calculator instantly shows total invested, wealth gained, and the final maturity value, along with a year-by-year growth chart so you can see exactly when compounding starts to dominate your own contributions.

Step-up SIP: matching investments to your salary growth

A step-up SIP (also called a top-up SIP) increases your monthly installment by a fixed percentage every year, typically in line with your annual salary increment. At the calculator’s default assumptions—₹10,000 per month, a 12% nominal annual return compounded monthly, start-of-month contributions, and a 10% step-up at each 12-month boundary—the step-up corpus is about 72% higher after 15 years and 99% higher after 20 years than a flat ₹10,000 SIP. Use the step-up toggle above to compare the paths for your own inputs.

Reading your result: nominal vs inflation-adjusted corpus

A projected corpus of ₹1 crore in 20 years is not worth ₹1 crore in today's money. At 6% average inflation, its real purchasing power is roughly ₹31 lakh. The inflation-adjustment toggle divides your nominal maturity value by (1 + inflation)^years so you can plan goals — retirement, education, a house — in today's rupees rather than inflated future ones. For return assumptions, equity-mutual-fund returns are market-linked, vary by scheme and period, and are not guaranteed. Use the rate control to test lower assumptions and revisit the projection periodically.

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Frequently asked questions

How is SIP return calculated?

SIP stands for Systematic Investment Plan — a fixed amount invested in a mutual fund every month. We use the annuity-due formula FV = P × [((1+i)^n − 1) ÷ i] × (1+i), where P is your monthly investment, i is the monthly rate (annual return ÷ 12), and n is total months. Investments are assumed at the start of each month.

What is a step-up SIP?

A step-up (or top-up) SIP increases your monthly investment by a fixed percentage every year—typically matching your salary increment. Under the calculator’s default ₹10,000 monthly contribution and 12% return assumption, a 10% annual step-up produces about 72% more after 15 years and 99% more after 20 years than a flat SIP.

What does "adjust for inflation" show?

It converts your future corpus into today's purchasing power by dividing the nominal value by (1 + inflation)^years. A ₹1 crore corpus in 20 years at 6% inflation is worth about ₹31 lakh in today's money.

Is 12% a realistic SIP return?

A 12% input is a projection assumption, not a promised return. Equity-mutual-fund returns vary by scheme and market period; use the rate control to test lower scenarios.

SIP vs lumpsum — which is better?

SIP averages your purchase cost across market ups and downs (rupee-cost averaging) and suits salaried investors. Lumpsum can outperform if invested early in a rising market but carries timing risk. This calculator lets you compare both.