Reverse SIP Calculator: How Much SIP for ₹50 Lakh in 10 Years?

Most SIP calculators answer the wrong question first: they ask how much you can invest, then show what it might become. A reverse SIP calculator flips it — start with the goal, then work out the monthly amount. For ₹50 lakh in 10 years, the illustrative monthly SIP is about ₹27,149 at an assumed 8% annual return, ₹24,207 at 10%, and ₹21,520 at 12%. Those figures assume monthly investing, annual returns compounded monthly, and no taxes, fees or missed instalments. Returns are never guaranteed, so treat every figure as a planning estimate, not a promise.

Open any SIP calculator and it asks three things: monthly amount, expected return, and duration. It then shows a large final number. That is satisfying, but it is not how most people actually plan. Nobody wakes up wanting to invest exactly ₹21,520 a month. People want ₹50 lakh for a house deposit, a child's education fund, or a sabbatical — and then ask what that costs each month. Working backwards changes the conversation. Instead of "what will my money become?", the question becomes "what must I set aside, and is that realistic on my salary?" If the answer is not realistic, you have three honest levers: give the goal more time, lower the target, or start smaller and step the amount up every year. Guessing a round number and hoping is the one option that reliably disappoints. This guide shows the reverse calculation in plain language, with a worked table you can reuse for your own goal, and the three traps that make reverse-SIP maths go wrong in real life.

A monthly SIP grows through two forces: the money you put in, and the return earned on money already invested. The formula for the monthly amount needed to reach a target is: Monthly SIP = Target ÷ [(((1 + monthly return) ^ number of months − 1) ÷ monthly return) × (1 + monthly return)]. The monthly return is the annual return divided by 12. The number of months is years multiplied by 12. The bracketed part is simply "how much ₹1 invested monthly would grow to" over the period. Divide the target by that growth factor, and you get the monthly amount. Worked example, step by step, for ₹50 lakh in 10 years at an assumed 12% a year: Monthly return: 12% ÷ 12 = 1% per month. Months: 10 × 12 = 120. Growth factor for ₹1 a month: about 232.34. Monthly SIP: ₹50,00,000 ÷ 232.34 = ₹21,520 (rounded). Check it the other way: ₹21,520 invested monthly for 120 months means ₹25,82,400 actually paid in. The remaining roughly ₹24,17,600 of the ₹50 lakh comes from assumed growth. That split is the whole point of starting early — time does more work than the monthly amount does, provided returns cooperate, which they may not.

Use the live SIP calculator above to test your own target: enter the monthly figure from the table below, your time horizon, and an assumed return, and compare the result with your goal.

All figures below are illustrative monthly SIPs, calculated with the formula above, assuming monthly investing and returns compounded monthly, before tax and fund expenses. Actual mutual fund returns vary every year and can be negative in some years. Goal 1 — ₹25 lakh in 7 years: At 8% assumed return: about ₹22,151 a month. At 10% assumed return: about ₹20,499 a month. At 12% assumed return: about ₹18,942 a month. Goal 2 — ₹50 lakh in 10 years: At 8% assumed return: about ₹27,149 a month. At 10% assumed return: about ₹24,207 a month. At 12% assumed return: about ₹21,520 a month. Goal 3 — ₹1 crore in 20 years: At 8% assumed return: about ₹16,865 a month. At 10% assumed return: about ₹13,060 a month. At 12% assumed return: about ₹10,009 a month. Notice two patterns. First, time beats return assumptions: ₹1 crore over 20 years needs less per month than ₹50 lakh over 10 years, even at the lowest assumed return. Second, the gap between the 8% and 12% columns is the uncertainty you must plan around — never budget on the highest column alone.

Suppose ₹21,520 a month for the ₹50 lakh goal is more than your budget allows today. A step-up SIP — increasing the monthly amount by a fixed percentage each year — can close much of the gap without heroic sacrifice in year one. Illustration: start at ₹15,000 a month and increase it by 10% each year for 10 years, at an assumed 12% annual return, and the end value comes to roughly ₹50,61,489. In other words, a salary-linked annual step-up turns an unaffordable flat SIP into a goal that is roughly met, on the same illustrative assumptions. The catch is discipline: the step-up only works if the increase actually happens every year. Most investors set it up once and forget it, which is fine — automation is the feature. But if income does not rise as expected, the plan must be revisited rather than silently abandoned. A step-up you cancel in year three is just a smaller SIP with a fancier name.

Trap 1 — Budgeting on the highest return. If you plan at 12% and earn 8%, the same ₹21,520 a month for 10 years reaches only about ₹39,63,245 instead of ₹50 lakh — a shortfall of more than ₹10 lakh. At 10% it reaches about ₹44,44,999. The fix is simple and unglamorous: plan on the middle or lower column, and treat anything above it as a bonus, not the plan. Trap 2 — Ignoring inflation. ₹50 lakh in 10 years will not buy what ₹50 lakh buys today. At 5% annual inflation, ₹50 lakh of today's purchasing power needs about ₹81,44,473 in 10 years' time; conversely, ₹50 lakh received in 10 years is worth only about ₹30,69,566 in today's money at the same inflation rate. If your goal is a real purchase — education fees, a house deposit — inflate the target first, then run the reverse calculation on the inflated figure. Trap 3 — Starting late and staying flat. Delay is expensive in a way that feels abstract until you see it. The same ₹21,520 a month at an assumed 12% reaches about ₹49,99,937 in 10 years but only about ₹41,92,559 in 9 years — one year less costs roughly ₹8 lakh of assumed growth. Starting a year late cannot be fixed by "investing a little more later" without a much larger monthly jump. If you are starting late, the honest fixes are a longer horizon, a smaller target, or a step-up plan — not a higher return assumption.

Step 1: Write down one goal, one amount, and one date. "₹50 lakh in 10 years" beats "save more" every time. Step 2: Inflate the target if it is a real purchase, using a modest inflation assumption such as 5% a year. Step 3: Look up the monthly figure in the table for the middle return column, not the highest. Step 4: If the figure exceeds your budget, test a step-up plan — a lower start with a fixed annual increase — in the calculator above. Step 5: Set a yearly review date. Check whether you are on track, whether income rose as expected, and whether the goal itself changed. Goals change; plans should be allowed to change with them, deliberately rather than by drift. One more caution: a SIP is a way of investing regularly in a market-linked fund, not a savings account. Values fall as well as rise, and a fund that returned 12% over one period may return far less over the next. Past returns do not predict future returns, and no calculator — including the one on this page — can remove that risk. It can only make the arithmetic honest.

This article is for educational purposes only and is not financial advice. Please consult a SEBI-registered investment adviser for personalized guidance. Investments are subject to market risk. Sources: Reverse-SIP figures calculated by the author using the standard future-value-of-annuity formula (monthly SIP, returns compounded monthly); illustrative return and inflation assumptions stated in the article.