“I will start next year, once my salary jumps and the car loan is done.” It sounds responsible. Delay a five-year plan by five years and you have lost one-sixth of it, so surely the damage is one-sixth, about 17%.
It is not. A five-year delay on a 30-year SIP runway does not cost you 17% of your corpus. It costs you roughly 46% of it. On a ₹10,000/month SIP aimed at retirement, that gap is about ₹1.61 crore of wealth that simply never gets created.
The reason your intuition is wrong is that not all rupees you invest are worth the same. The first rupees, the ones you put in when you are 30, do almost all the heavy lifting. The rupees you add at 58 barely move. When you delay, you do not chop off the cheap final years. You chop off the priceless first ones.
This post is only about the numbers. No “start early” poster wisdom, just the actual rupee cost of five years, and exactly how much bigger your SIP has to be to buy them back.
The setup
Keep it clean and comparable. Two people, same fund, same target retirement age of 60, same monthly amount.
- Aarav starts at 30 and runs a ₹10,000/month SIP for 30 years (360 instalments).
- Vikram does everything identically but starts at 35, running the same ₹10,000/month for 25 years (300 instalments).
Assumed return: 12% per year, compounded monthly. This is a representative long-run figure for Indian equity, roughly the Nifty 50 TRI’s historical CAGR over 20-plus years. It is not guaranteed. I use it because it is the number most SIP calculators default to, so you can check my working.
The SIP future-value formula, end-of-month convention:
FV = P x [ ((1 + i)^n - 1) / i ]
P = 10,000 i = 0.01 (12% / 12) n = months
What five years actually costs
Run both through the formula:
| Investor | Start age | Years | Instalments | Total invested | Corpus at 60 |
|---|---|---|---|---|---|
| Aarav | 30 | 30 | 360 | ₹36,00,000 | ₹3.49 crore |
| Vikram | 35 | 25 | 300 | ₹30,00,000 | ₹1.88 crore |
Aarav put in ₹6 lakh more over his life. He ended up with ₹1.61 crore more.
Sit with that ratio. An extra ₹6 lakh of contributions produced an extra ₹1.61 crore of corpus. That is not a typo and it is not leverage. It is time.
And notice the headline: Vikram delayed by 17% of the runway (5 of 30 years) and landed with a corpus 46% smaller (₹1.61 cr / ₹3.49 cr). The penalty is nearly three times what the linear intuition predicts.
Why the first rupees are the only ones that matter
Here is the mechanism that breaks everyone’s mental model.
Split Aarav’s 30-year SIP into two buckets: the first 5 years of contributions (ages 30 to 34) and the remaining 25 years (ages 35 to 59). Both buckets grow until he turns 60.
The last-25-years bucket is exactly Vikram’s situation, so we already know it grows to ₹1.88 crore. That means the first-5-years bucket must account for the rest:
First 5 years of contributions = ₹3.49 cr - ₹1.88 cr = ₹1.61 crore
Rupees actually contributed = ₹10,000 x 60 = ₹6,00,000
Growth multiple = 1.61 cr / 6 lakh = about 27x
Now do the same for the last 5 years of Aarav’s SIP (ages 55 to 59). Those 60 instalments have almost no time left to compound. Their value at 60 is just the future value of a 5-year SIP:
Last 5 years of contributions = ₹10,000 x [((1.01)^60 - 1)/0.01] = ₹8.17 lakh
Rupees actually contributed = ₹6,00,000
Growth multiple = about 1.36x
Same ₹6 lakh. Invested in your early 30s it becomes ₹1.61 crore. Invested in your late 50s it becomes ₹8.17 lakh. That is a 20x difference in outcome for the identical amount of money, decided by nothing except when you put it in.
| The same ₹6 lakh, invested… | Becomes at 60 | Multiple |
|---|---|---|
| In the first 5 years (age 30-34) | ₹1.61 crore | ~27x |
| In the last 5 years (age 55-59) | ₹8.17 lakh | ~1.36x |
When you delay your start by five years, you are not skipping the ₹8.17 lakh years. You are skipping the ₹1.61 crore years. That single fact is the entire post.
Catching up costs far more than you think
The comforting story is: “Fine, I started late, I will just invest a bit more to make up for it.” So how much more?
To hit Aarav’s ₹3.49 crore in only 25 years, Vikram has to solve for a bigger P:
Required P = 3,49,49,600 / [((1.01)^300 - 1)/0.01]
= 3,49,49,600 / 1,878.85
= about ₹18,600 / month
Not a bit more. ₹18,600 instead of ₹10,000, an 86% jump, every single month for 25 years.
Look at what the delay does to the catch-up SIP as it stretches out. Target in every row is the ₹3.49 crore that a ₹10,000 SIP builds from age 30:
| You start at | Years to 60 | SIP needed to still hit ₹3.49 cr | vs ₹10,000 |
|---|---|---|---|
| 30 | 30 | ₹10,000 | baseline |
| 35 | 25 | ₹18,600 | 1.9x |
| 40 | 20 | ₹35,300 | 3.5x |
| 45 | 15 | ₹70,000 | 7.0x |
Delay five years, pay 1.9x. Delay ten years, pay 3.5x. Delay fifteen years and you need seven times the monthly commitment to reach the same finish line. The cost of catching up rises far faster than the delay itself, because you are trying to buy back the most powerful compounding years with money alone, and money is a poor substitute for time.
There is a second, quieter cost. To catch up from a 5-year delay, Vikram pays ₹8,600 extra per month for 300 months, which is ₹25.8 lakh of extra contributions, all to replace the ₹6 lakh of early instalments he skipped. He spends ₹25.8 lakh to buy back ₹6 lakh of missed savings. That is the exchange rate on lost time.
Each five-year slip roughly halves the corpus
The pattern is not linear, it is closer to geometric. Same ₹10,000/month, same retirement at 60, at 12%:
| Start age | Years to 60 | Corpus at 60 | Drop vs starting 5 yrs earlier |
|---|---|---|---|
| 25 | 35 | ₹6.43 crore | - |
| 30 | 30 | ₹3.49 crore | -₹2.94 cr (-46%) |
| 35 | 25 | ₹1.88 crore | -₹1.61 cr (-46%) |
| 40 | 20 | ₹98.9 lakh | -₹89 lakh (-47%) |
| 45 | 15 | ₹49.9 lakh | -₹49 lakh (-50%) |
Every five years you wait knocks off roughly 46 to 50% of the final number. Waiting from 25 to 35, two lazy five-year windows, drops you from ₹6.43 crore to ₹1.88 crore. You keep about 29% of what was on the table, and you did nothing wrong except be busy.
Does the story survive a lower return?
A fair objection: 12% is optimistic, what if equity delivers a duller 10%? The rupee amounts shrink, but the delay penalty barely does. Same ₹10,000/month, retire at 60, at 10%:
| Investor | Years | Corpus at 60 | Gap |
|---|---|---|---|
| Start at 30 | 30 | ₹2.26 crore | - |
| Start at 35 | 25 | ₹1.33 crore | ₹93 lakh |
A five-year delay still vaporises ₹93 lakh, about 41% of the corpus. The catch-up SIP needed at 10% is about ₹17,000 (1.7x). Lower returns actually make the money an even weaker substitute for the time, because with less growth to lean on, the early years matter even more. There is no return assumption under which starting late is cheap.
If you genuinely cannot invest more right now
The point of this post is not guilt. If you are 35 and reading this, the worst move is to conclude you have “missed it” and do nothing. ₹1.88 crore is still a serious corpus, and it beats ₹0 by ₹1.88 crore.
The realistic tool for a late starter is the step-up SIP: start with what you can, raise it every year as income grows. Does it work? Yes, but be honest about the cost. Take Vikram, starting at 35 with ₹10,000/month and stepping it up 10% every year for 25 years at 12%:
Corpus at 60 = about ₹3.70 crore
Total invested = about ₹1.18 crore
Monthly SIP by year 25 = about ₹98,500
The step-up late starter actually beats Aarav’s ₹3.49 crore. But look at the price of admission: he had to pour in ₹1.18 crore of contributions versus Aarav’s ₹36 lakh, and his SIP had to climb to nearly ₹1 lakh a month by the end. Aarav reached the same place on a fraction of the money because time did the work that Vikram had to pay cash for.
So the practical hierarchy is simple:
- Start now, today, with any amount you can sustain. A ₹3,000 SIP begun this month outranks a ₹15,000 SIP you plan to start “after the appraisal.”
- Automate a 10% annual step-up so the amount grows without another decision.
- Direct any bonus, increment, or freed-up EMI straight into the step-up rather than lifestyle.
Bottom line
A five-year delay on a retirement SIP is not a 17% problem, it is a 46% problem. On a plain ₹10,000/month plan aimed at 60, starting at 35 instead of 30 costs about ₹1.61 crore, because the years you skip are the highest-compounding years you will ever have, worth roughly 27x versus the 1.36x you get from last-minute contributions. Buying that time back later is brutal: you need an 86% bigger SIP for a five-year slip, and 7x for a fifteen-year one.
What to actually do: if you have not started, start this month with whatever amount clears your account without stress, set a 10% annual step-up, and stop waiting for the “right” time, because the calculator does not care about your reasons, only your dates. If you started years ago, the same math says raise the SIP now rather than next year. The single most expensive word in this entire post is “later.”
All figures are illustrative, using a representative 12% (and a 10% sensitivity) annual return based on approximate historical Indian equity performance and standard SIP compounding. Actual returns vary and are not guaranteed. This is not investment advice.
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