# SIP start-date is the input you cannot buy back

_Systematic Investing . 2026-06-14 . By Tanmay Kurtkoti. Educational, illustrative, not advice._

A friend turned 35 last week and asked, a little embarrassed, whether it was too late to start a SIP.

Not too late. But I pulled up a number that made him go quiet for a second.

Picture two people, both putting away the same Rs 10000 a month. The first one starts at 25 and pays in for exactly ten years. At 35 she stops cold and never invests another rupee. The second one starts at 35 and keeps going for twenty five years straight, all the way to 60.

The one who quit at 35 ends up with more. A lot more.

At a 12 pct illustrative return, the early saver's Rs 12 lakh grows to roughly Rs 4.6 crore by the time she is 60. The late saver puts in Rs 30 lakh over those twenty five years and lands at about Rs 1.9 crore. So the early saver invested Rs 18 lakh less, and finished Rs 2.7 crore ahead.

Here is the part that actually matters. By 35, the early saver had already paid in her last rupee. Her Rs 12 lakh had quietly become about Rs 23 lakh. Everything after that, the entire rest of the Rs 4.6 crore, was time doing the work. She was not saving anymore. She was just letting it sit.

That is the whole lesson. The value of a rupee you invest is mostly the time it gets to compound, not the size of the cheque. A rupee invested at 25 gets thirty five years to work. The same rupee at 50 gets ten. Same note, completely different job.

And you cannot backfill the years. The late saver did everything right except the timing, doubled the money, and still came up short. More rupees later do not buy back time already gone.

So if you have been waiting to "start once I earn a bit more", remember: the amount is the part you can fix later. The start date is the part you cannot.

Start small. Start now.

How time, SIPs and rebalancing actually compound, in plain numbers: