What SIP return should I type into the calculator—really?
Use mid-single to low-double-digit SIP assumptions for equity, stress-test lower, and never treat a calculator output as a guarantee.
Skip to the calculator below this article
Past CAGR is a rear-view mirror
Categories print glossy 3-year and 5-year numbers after bull runs.
Typing 18% into a 20-year SIP calculator feels good.
It also plans a life you may not afford if returns mean-revert.
For equity-heavy SIPs, many planners sketch 10–12% long-term.
For hybrid, lower. For pure debt SIP, think closer to FD-ish territory.
Then run a pessimistic case too.
If your plan only works at 16%, it is a wish, not a plan.
Past 3-year fireworks are not a 20-year plan.
Inflation and tax are the quiet villains
A 12% pre-tax, pre-inflation chart is not a 12% lifestyle upgrade.
Haircut the plan. Your future self says thanks.
Even a simple “real return ~6–7%” thought experiment changes SIP amounts.
People skip this because it is emotionally expensive.
Do it anyway.
Calculator optimism is a free drug. Hard to quit.
Quit yearly, on purpose, during a review.
What 12% actually means emotionally
It does not mean +1% every month like an FD hallucination.
Some years you will see −20% on mark-to-market and still be “on track” long-term.
If that sentence makes you nauseous, lower equity or lower the assumed return and save more.
Saving more at a lower assumption is a valid strategy.
Risk capacity ≠ risk needed for a fantasy return.
I would rather under-assume and over-save than the reverse.
The reverse is how people feel cheated by compounding.
Tax and inflation quietly shrink the brag number.
Category-wise ballparks (planning, not prophecy)
Broad equity / index: often planned around 10–12%.
Aggressive hybrid: a bit lower than pure equity in planning sheets.
Debt / liquid: think mid-single digits, roughly FD-ish after costs.
International funds: different currency drama—don’t paste Nifty history on them blindly.
Small caps: higher uncertainty, wider range, uglier drawdowns.
Using last year’s small-cap return as your 20-year assumption is comedy.
Funny until the SIP amount is wrong for a decade.
Should you change SIP amount when returns are low for a year?
Usually no—if the goal and asset mix are intact.
Changing strategy every bad year is how compounding dies.
Exception: your income fell, or the goal date moved closer.
Those are life changes, not market vibes.
Market vibes are not an asset allocation policy.
Write your assumed return on a sticky note and leave it alone for 12 months.
Revisit assumptions on a schedule, not on a red candle.
XIRR vs the number you typed
Early SIP XIRR will bounce around like a caffeine addict.
Don’t rewrite your life plan because year-two XIRR is 3%.
Or 28%. Both can mislead.
Compare long-run XIRR to your assumption after many years, not many weeks.
Also compare contribution discipline. Did you invest what you said?
Under-contributing while blaming “low returns” is a classic magician trick.
The rabbit was never in the hat.
How I pick a number in practice
Equity goal 10+ years: I type 10% and 12%, plan affordability on 10%.
If 10% monthly SIP is impossible, I change the goal or timeline—not the fantasy rate.
I do not use 15% unless I am stress-testing optimism for fun.
Fun ≠ funding.
For debt goals under 3 years, I don’t use equity assumptions at all.
Wrong tool. Wrong number. Wrong headache.
Tool first, rate second.
Ignore these return sources
A friend’s 2017–2021 personal XIRR as universal truth.
Distributor WhatsApp forwards with stars and rockets.
YouTube titles that include “secret” and “double.”
Point-to-point returns from a market bottom to today.
Those are marketing candles, not planning inputs.
Use long periods, multiple regimes, and humility.
Humility compounds better than arrogance. Metaphorically. Still useful.
Change the numbers in the calculator above and see the result on this page.
Estimates only—not personalised financial, tax, or investment advice. Markets, loan rates, and tax rules change. Confirm numbers with your lender, CA, or advisor before acting.