Compounding rewards the earliest years most, which means a delay costs far more than the instalments you skip. This puts a number on it, and is honest about when waiting is the right decision anyway.
Assumptions last reviewed 20 August 2026
₹10,000 a month for 25 years at 12% a year reaches ₹1.90 Cr. You put in ₹30.00 L; the rest, ₹1.60 Cr, is growth.
The band spans 10% to 13% a year. A single line at this horizon would be false precision.
Starting twelve months from now instead of today would cost you ₹22.49 L at the end.
Past performance may or may not be sustained in future and is not a guarantee of any future returns. The rate is capped at 13% p.a., being the mean of 10-year rolling returns of the Nifty 50 between 1 June 2013 and 30 May 2023 (12.93%), the basis AMFI prescribes for illustrations.
| Year | Paid in this year | Growth this year | Total paid in | Value | In today’s money |
|---|---|---|---|---|---|
| today | ₹0 | ₹0 | ₹0 | ₹0 | ₹0 |
| 5 | ₹1.20 L | ₹86,515 | ₹6.00 L | ₹8.25 L | ₹6.16 L |
| 10 | ₹1.20 L | ₹2.55 L | ₹12.00 L | ₹23.23 L | ₹12.97 L |
| 15 | ₹1.20 L | ₹5.62 L | ₹18.00 L | ₹50.46 L | ₹21.05 L |
| 20 | ₹1.20 L | ₹11.18 L | ₹24.00 L | ₹99.91 L | ₹31.15 L |
| 25 | ₹1.20 L | ₹21.29 L | ₹30.00 L | ₹1.90 Cr | ₹44.21 L |
Growth overtakes the money you paid in during year 11. From that point on, most of what you hold is something you did not pay for.
Many Indian return calculators let you type 20%, and some go to 30%. This one stops at 13%, which is roughly what the market has actually delivered over a decade.
Mean of every 10-year rolling return between 1 June 2013 and 30 May 2023. Source: AMFI Best Practices Guidelines Circular 109/2023-24 of 1 November 2023, which sets these as the rates a mutual fund illustration in India may use. Nifty 50 at 12.93% is the highest of them, which is where the 13% ceiling comes from.
Your settings above, ₹10,000 a month for 25 years, at three different assumptions.
The gap between those figures is not a return. It is an assumption.
12.93% is the average of every ten-year stretch in that period. Some stretches were better and several were a great deal worse, and you get one of them rather than the average of all of them. So a calculator set to 20% is not being optimistic. It is quietly moving the goalposts, because a higher assumed rate makes the monthly amount you need look smaller than it is. That is the one error in this arithmetic that costs you money, and it only shows up twenty years later, when the corpus is short.
AMFI sets this ceiling for every mutual fund illustration in India. It is also the number we would have picked.
The same contribution is run twice: once over your full horizon, and once over a horizon one year shorter. The difference between the two end values is the cost of the delay.
That framing is deliberate and it is the honest one. Delaying a start by a year does not mean investing for the same period beginning later, it means investing for one year less, because the date you need the money is usually fixed by your age rather than by when you got round to starting.
The year you lose is the first one, not the last one, and the first year is the one every subsequent year compounds on top of. That is the entire reason the number is so much larger than the instalments skipped.
It assumes the money exists and you are simply not investing it. If the delay is because you are clearing a 14% personal loan or building a first emergency fund, the delay is not a cost, it is the correct order of operations, and this page is measuring the wrong thing.
It applies one constant rate. In a real sequence, a year of delay that happens to skip a bad year costs nothing at all and occasionally pays. Nobody can know which years those are in advance, which is the honest argument for starting rather than for timing.
The figure is in the rupees of the final year. Switch to today’s money and it shrinks a great deal, which is the fair way to read it.
And it ignores tax on redemption entirely.
On the default figures, ₹22.49 lakh. That is ₹10,000 a month for twenty-five years at an assumed 12%, which reaches ₹1.90 crore, against the same contribution started twelve months later.
The instalments actually skipped come to ₹1.2 lakh. So the delay costs roughly nineteen times the money not invested, and all of that difference is compounding that never happened.
Because you do not lose an average year, you lose the first one. A rupee invested in year one at 12% is multiplied about twenty times over twenty-five years. A rupee invested in year twenty-five is multiplied by roughly one. Cutting a year off the start removes the most productive twelve months in the whole plan, and every later contribution then has one year less to work.
It compounds too, and not in a straight line. On the same default figures:
Five years of delay costs almost half the entire outcome, on a plan whose total contributions over twenty-five years are ₹30 lakh. That is the shape of the thing: the loss is front-loaded because the compounding is.
Yes, and a page that says otherwise is selling something. Three cases where delay is the correct decision and the number above is measuring the wrong thing:
High-interest debt. Clearing a personal loan at 14% or a credit card at far worse is a certain, tax-free return that a 12% assumption does not beat. Pay it off first.
No emergency fund. Investing before you have three to six months of expenses set aside usually means redeeming at the worst possible moment, which costs more than the delay does.
Money you will need soon. A deposit due in eighteen months does not belong in a growth asset regardless of what compounding would do over twenty-five years.
Then you are making two decisions correctly instead of one: when to leave and when to return. The evidence on retail timing is not encouraging, and the arithmetic is unforgiving in a specific way, because the cost of being out during a good year is immediate while the benefit of avoiding a bad one only shows up if you also get back in. A monthly contribution sidesteps the question entirely by buying at every level, which is most of its appeal.
The same logic points that way, and the honest caveat is that a lumpsum carries timing risk a monthly contribution averages out. Historically, investing available money immediately has beaten spreading it, because markets rise more often than they fall. If the amount is large enough that a bad first year would make you abandon the plan, spreading it over six or twelve months costs a little expected return and buys something worth having. The lumpsum calculator models the arithmetic side of it.
Much smaller, and this is the fair way to read the headline. ₹22.49 lakh twenty-five years out has the purchasing power of about ₹5.24 lakh today at 6% inflation. Still roughly four times the instalments skipped, so the argument survives being stated honestly. Tick In today’s money and every figure on the page reprices.
No, and it is worth saying plainly. The cost of the years already gone is fixed and there is nothing to be done about it. The only number that is still yours to change is the one for the year ahead, and it is the same size as the one behind you. The useful reading of this page is always forward.
On ₹10,000 a month over a twenty-five year horizon at an assumed 12%, ₹22.49 lakh, against ₹1.2 lakh of instalments actually skipped. The multiple is large because the year lost is the first one, which every later year compounds on top of.
Start now, in almost every case where the money is genuinely spare. A smaller amount for longer usually beats a larger amount for less time, and a step-up SIP lets the amount grow with your income rather than waiting for it to.
If the loan rate is above what you would reasonably assume on the investment, yes. A prepayment is a certain, tax-free return equal to the loan rate, and a 14% personal loan is a higher bar than a 12% assumption clears.
It helps, and it rarely fully compensates. To recover a one-year delay on the defaults here you would need to raise the monthly amount to ₹11,345 for the remaining twenty-four years, about 13% more, which is a permanent increase rather than a one-off catch-up.
No. It computes what a delay costs on assumptions you choose, and the explainer sets out three situations where waiting is the correct decision. Zenith is an AMFI-registered mutual fund distributor and this page does not tell you what to buy or when.
AMFI Best Practices Guidelines Circular 109/2023-24 caps the return used in any mutual fund illustration at 13%. It matters on this page in particular, because a higher assumed rate inflates the cost of waiting and makes the argument look stronger than it is.
Talk to the desk
Most delays are not indecision. They are a loan that should be cleared first, an emergency fund that does not exist yet, or money that is needed sooner than the plan assumes. Tell us what is actually in the way and we will start from that.
Calculator outputs are indicative projections on assumptions you select, not assurances, and not a projection of the performance of any scheme.
