How much should you step up your SIP?
Picking a step-up rate that matches your income growth without straining your budget.
A step-up SIP increases your monthly investment by a fixed percentage every year instead of staying flat. Whether to step up at all barely matters; the number that actually decides the outcome is how much, and the answer has a genuine anchor: your own income growth, not an arbitrary round number.
What the step-up rate buys you
Because each year’s contribution compounds for longer than the last, small differences in the step-up percentage produce large differences in both the total amount you end up investing and the final corpus.
Starting at â‚ą15,000/month, 12% expected return, over 15 years, using the real computeStepUpSip formula: no step-up (flat SIP) invests â‚ą27,00,000 total, reaching â‚ą74,93,703. A 5% annual step-up invests â‚ą38,84,141, reaching â‚ą96,99,137. A 10% step-up invests â‚ą57,19,047, reaching â‚ą1,28,96,806. A 15% step-up invests â‚ą85,64,474, reaching â‚ą1,75,77,066: more than double the flat-SIP outcome from the same starting contribution.
Model a SIP that increases every year in line with your rising income.
The rule of thumb: match your income growth
A bigger step-up always produces a bigger corpus in the math above, but it also means a bigger share of your paycheck every single year, whether or not your paycheck actually grew that much. The rule of thumb that keeps this sustainable is simple: set your step-up percentage close to your own expected annual salary growth, not higher.
If your SIP starts at ₹15,000 against a ₹75,000 monthly salary (20% of income), and both your salary and your SIP grow at the same 10% a year (a commonly used typical annual hike assumption), your SIP stays at exactly 20% of your income every single year. The rupee amounts keep rising, but the shareof your paycheck going toward it never changes, which is what makes the step-up sustainable indefinitely rather than something you’ll eventually need to dial back.
What mismatching it does over time
Starting at the same 20% of income (₹15,000 SIP against a ₹75,000 salary, salary growing 10%/year): a 5% step-up, slower than income growth, quietly drops your savings rate from 20% to just 10.4% of income by year 15, even though the rupee amount is still technically rising every year. Flip it around with a 15% step-up, faster than income growth, and the savings rate balloons to 37.3% of income by year 15instead, which can genuinely strain a budget if your actual hikes don’t keep pace.
Both mismatches are easy to miss in the moment, because the absolute SIP amount looks like it’s growing responsibly either way. Only the share of income reveals whether the step-up rate is actually still calibrated to what you can comfortably afford. Revisit the step-up rate whenever your actual hike differs meaningfully from what you originally assumed, rather than setting it once and forgetting it.
All figures are indicative and for educational purposes only, not financial advice.
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