SIP step-up calculator

Make the future contribution as visible as the ending value

Read step-up as a recurring percentage increase

A step-up is applied to the monthly contribution after each full year in this tool. Start with 1,000 per month and a 10% step-up. The second year's monthly contribution is 1,100, and the third year's is 1,210. It is not 1,000 plus an additional fixed 100 each year forever. Because the percentage applies to the previous amount, the difference grows over time. The final monthly contribution is an important part of the result, not a decorative extra statistic.

Consider two years with zero assumed return. The first year contributes 12 × 1,000, or 12,000. The second contributes 12 × 1,100, or 13,200. Total invested and ending value are both 25,200. Now change only the step-up to zero: both years contribute 12,000, giving 24,000. The difference of 1,200 is additional saving, not an investment gain. This comparison helps identify which part of a larger projection comes from depositing more money.

For three years at the same zero-return assumptions, contributions total 12,000 plus 13,200 plus 14,520, or 39,720. The final monthly contribution is 1,210. These deliberately simple examples let you check the annual schedule with ordinary multiplication. They do not assume a particular fund, future market return, or salary increase.

Separate a contribution plan from a return assumption

The expected-return field is a constant nominal annual scenario converted into a monthly rate by dividing by twelve. Each monthly contribution is added at the beginning of the month in this implementation. Another calculator using a different deposit date or effective-rate conversion can produce a different ending value without either page having a typing mistake. Compare the timing rules before comparing results.

An annual contribution increase does not ensure a steadily increasing market value. Actual investment prices can vary independently of the deposits, and the sequence of gains and losses can matter. The displayed gain in this calculator comes from its smooth return assumption. It is not a product guarantee, a historical backtest, or a probability-weighted forecast.

To explore the contribution plan on its own, keep the return at zero. To explore sensitivity to the return assumption, keep the contribution schedule unchanged and run several rates. Record both settings with each result. Changing contribution growth and investment return simultaneously makes it harder to explain why one scenario is larger than another.

Check whether the last year's payment is practical

A plan that begins with a comfortable contribution can end with a much larger monthly commitment. Before focusing on the corpus, write the starting and final monthly amounts side by side. The calculator assumes every scheduled deposit is made. It does not estimate your future income, automatically stop contributions when money is unavailable, or check affordability against other commitments.

If you expect a fixed increase instead of a percentage increase, this form does not describe that schedule directly. Likewise, irregular bonuses or one-time deposits are not the same as increasing every future monthly payment. Use a separate cash-flow schedule for those cases rather than adjusting the percentage until the ending value looks close to a target. The shape of the deposits still matters.

Reconcile the displayed totals

The total invested is the sum of all scheduled contributions. Estimated gain is the ending value minus that total. At zero return, those two amounts should reconcile with no gain. With a positive return, the contribution total remains an input-driven ledger while the ending value also includes the assumed monthly growth. Neither number accounts for unentered fees, taxes, or inflation.

For a purchasing-power comparison, keep an inflation assumption separate from investment return and contribution growth. They refer to different processes. Do not subtract an inflation percentage from the annual step-up and describe the remainder as a reliable real-world savings increase; the timing and underlying bases need their own calculation.

Save assumptions before revisiting a goal

Keep a record of the starting monthly amount, annual step-up, years, expected return, deposit timing, and final monthly requirement. If your contribution plan changes, create a new scenario and preserve the old one for comparison. The estimate is useful as a transparent plan you can revisit, with a clear distinction between money you intend to contribute and growth that remains uncertain.

Reference: SEBI compound-interest illustration and return limitations. Examples above use this calculator’s assumptions.