How a step-up SIP works
A step-up SIP (also called a top-up SIP) is a variant of the standard SIP where your monthly contribution increases by a fixed percentage every year. The formula is straightforward: at the start of each new year, the monthly contribution multiplies by (1 + stepUpPct/100), and the next 12 monthly investments are made at the new, higher amount. All previous contributions continue to compound.
This calculator uses an iterative year-by-year model (the same model used in AMFI investor education material):
- For each year
y = 1 to N:- Apply 12 monthly contributions at the year’s contribution level, each time accruing one month of return before adding the contribution.
- After 12 months, multiply the monthly contribution by
(1 + stepUpPct/100)to get next year’s rate.
- Final balance = maturity value.
Why step-up beats flat SIP over long horizons
With a flat SIP the rupee amount you commit stays constant. Adjusted for inflation, you’re actually investing less real money each year. A step-up SIP counteracts this: as your income grows, so does your investment. The result is a materially larger corpus — not because of higher returns, but because you contributed meaningfully more in the later years, which are also the years with the longest remaining compounding runway.
| Scenario | Total invested | Maturity value |
|---|---|---|
| Flat ₹10K, 12%, 10yr | ₹12,00,000 | ~₹23,23,000 |
| 10% step-up from ₹10K, 12%, 10yr | ~₹19,12,000 | ~₹35,07,000 |
| 15% step-up from ₹10K, 12%, 10yr | ~₹24,36,000 | ~₹47,20,000 |
Educational estimates. Actual returns are market-linked and vary.
What step-up % to choose
| Income growth scenario | Suggested step-up % |
|---|---|
| Stable government/PSU job, ~6% increments | 5–7% |
| Private sector, ~10% increments | 8–10% |
| High-growth career / startup / senior role | 12–15% |
| Aggressive wealth-building target | 15–20% |
These are illustrative ranges. BachatCalculator does not provide personalised financial advice.
Tax treatment of step-up SIP redemptions
A step-up SIP is still a mutual fund SIP — the tax rules are identical:
- Equity-oriented funds, holding > 1 year per instalment: LTCG at 12.5% on gains above ₹1L per FY (post-23-Jul-2024).
- Equity-oriented funds, holding < 1 year: STCG at 20% (post-23-Jul-2024).
- Debt MF (purchased after 1-Apr-2023): gains taxed at slab rate regardless of holding period.
- ELSS: 3-year lock-in per instalment; qualifies for §80C deduction up to ₹1.5L per FY.
See our LTCG equity calculator for the tax math on redemption.
Bridges
- SIP calculator — flat SIP for direct comparison
- Lumpsum calculator — one-time investment projection
- SWP calculator — plan systematic withdrawals in retirement
- XIRR calculator — compute actual return on irregular cash flows
- Section 80C calculator — ELSS SIP tax deduction