SIP for Retirement Planning — Sizing a Goal You Cannot Borrow For

The most common planning error is anchoring to what life costs now. Retirement is decades away for most people, and prices do not stand still — at an inflation rate of around 6%, costs roughly double every twelve years. A target set at today's expenses will therefore fund a noticeably smaller life than the one it was meant to fund.

The sequence that works runs backwards. Start with your monthly expenses today, strip out costs that will disappear (a home loan EMI, children's education, commuting) and add ones that will grow (healthcare, help at home). Inflate that adjusted figure to your retirement year. Only then work out the monthly investment it requires.

A widely used rule of thumb is that the corpus should be roughly twenty-five to thirty times your expected annual expenses at retirement. It is a starting point rather than an answer — your pension income, health cover and how many years you are planning for all move it. Our goal planning tools apply the inflation adjustment for you so the target is stated in the rupees of the year you will actually need it.

Salaried investors often assume retirement is handled because EPF is deducted every month and NPS may be too. Both are genuinely useful, and neither is usually sufficient on its own.

EPF earns a declared rate that has historically stayed close to inflation rather than far ahead of it, which makes it excellent for capital safety and unremarkable for growth over a thirty-year horizon. NPS is better structured for the long run, but its equity allocation is capped, it tapers as you age, and a portion of the corpus must be used to buy an annuity at exit — so the money is not fully yours to deploy.

What a mutual fund SIP adds is a growth-oriented layer you actually control: no cap on equity exposure, no annuity requirement, and full liquidity if plans change. The sensible structure is three layers rather than one — EPF and NPS as the floor, an equity SIP as the growth engine, and a liquid buffer for emergencies so neither of the other two has to be disturbed.

Of everything you control in retirement planning, the number of years you stay invested does the most work. It is not close. A longer runway means every instalment compounds for longer and you make more instalments in total — the two effects stack.

This is why the advice to start in your twenties is repeated so often, and why it is genuinely annoying to hear at forty. So it is worth stating the second half honestly: if you are starting late, the correct response is to start now at whatever you can commit and raise it aggressively with every increment, not to conclude that the window has closed. A late start with a rising instalment is a workable plan. A late start postponed another three years is not.

If you want to see how the required monthly amount changes as you move the horizon, put your own numbers into the SIP calculator and try a few different retirement ages. The pattern becomes obvious very quickly.

A retirement corpus should not still be fully exposed to equity in the year you plan to retire. Markets can fall sharply and take years to recover, and a fall in year twenty-nine of a thirty-year plan does damage that no later contribution can repair.

The usual approach is a glide path: keep equity dominant through the long middle years, then move portions into steadier categories as the date gets closer, typically beginning several years out rather than all at once at the end. Selling gradually also means you are not forced to convert everything on a single date at whatever price the market offers that week.

After retirement, the question changes from accumulation to withdrawal. Drawing a monthly income through a Systematic Withdrawal Plan usually works better than redeeming in large chunks, both for tax treatment and for making the corpus last. Deciding the glide path and the withdrawal structure a few years before retirement — rather than in the final month — is what separates a planned exit from a rushed one. That conversation is one we have with clients regularly; get in touch if yours is within a few years.