Step-Up SIP Calculator

A step-up or top-up SIP is a systematic investment plan where your monthly installment automatically increases by a fixed percentage every year, instead of staying flat for the whole tenure. For example, a ₹5,000/month SIP with a 10% annual step-up becomes ₹5,500/month in year 2, ₹6,050/month in year 3, and so on — letting your contribution grow in step with your income.

Each year is treated as a level 12-month annuity-due block whose installment is P·(1+g)^(k-1) in year k (P = initial monthly amount, g = annual step-up rate). Each block's future value at that year's end is grown for the remaining years at the monthly compounding rate, and the N yearly blocks are summed with a geometric-series identity into a single closed-form maturity value. Setting the step-up rate to 0% collapses this exactly to the standard level-SIP formula.

For ₹5,000/month at an assumed 12% annual return over 10 years, a level SIP (0% step-up) grows to about ₹11,61,695, while the same starting amount with a 10% annual step-up grows to about ₹16,87,163 — roughly 45% more corpus — even though the total amount invested only rises from ₹6,00,000 to about ₹9,56,245. The step-up amplifies compounding because the extra contributions in later years still get many years to grow.

No. The expected return you enter is an assumption, not a promise. Mutual fund investments are subject to market risks, and actual NAV growth varies year to year and can be negative in some years. This calculator is an illustrative projection only — read the scheme documents carefully before investing.

A common approach is to match your expected annual salary increment — many investors use 5–15% per year. There is no single correct figure: a higher step-up grows the corpus faster but also requires a larger cash-flow commitment each year, so pick a rate you can sustain even in a year without a raise.

Most fund houses actually offer both mandate types: a percentage top-up (the installment rises by a fixed % each year, e.g. 10%) and a fixed-amount top-up (the installment rises by a flat rupee sum each year, e.g. ₹1,000, usually in multiples of ₹500). This calculator models the percentage type, which is the more common choice because it scales with a growing income — a flat rupee increase shrinks in relative and real terms as years pass and inflation erodes it, while a percentage increase keeps pace.

A regular SIP invests the same fixed amount every month for the entire tenure. A step-up SIP raises that fixed amount by a set percentage once a year, so your contribution — and eventually your corpus — grows faster than a level SIP with the same starting installment. Setting the step-up rate to 0% in this calculator reproduces the level-SIP result exactly.

No. The figure shown is a gross nominal projection. It does not deduct the fund’s expense ratio, exit load, or capital-gains tax (equity LTCG/STCG), and it does not adjust for inflation, so your real, in-hand value will be lower than the headline number.

Just like a regular SIP, each monthly installment — including the higher installments from later step-up years — is treated as a separate investment with its own holding-period clock from its debit date. For equity-oriented funds, units held over 12 months qualify for long-term capital gains (LTCG) at 12.5% above the ₹1.25 lakh annual exemption (Section 112A, FY 2025-26); units held 12 months or less are short-term capital gains (STCG) at 20%. Debt fund gains are taxed at your income-tax slab rate regardless of holding period. Consult your tax adviser for your exact liability.

Yes — manually revising your SIP amount each year achieves the same underlying maths as a step-up SIP, as long as the increase happens once a year. A step-up mandate simply automates that annual increase with your fund house or bank so you don’t have to remember to raise it yourself.

This calculator does not model a ceiling — it projects the installment growing indefinitely at the step-up rate for the full tenure. In practice, some fund houses or bank mandates cap the maximum step-up amount or the number of years the increase applies; check your specific SIP mandate for any such limit before assuming the full projected growth.

Missing one installment does not cancel your SIP. Most fund houses simply skip that month's debit and continue with the next scheduled date at the currently applicable (stepped-up) amount. The missed month's corpus simply reflects one fewer installment — the remaining installments continue compounding for their full tenure as modelled here.

The closed-form maturity formula involves a division by (the annual growth factor minus the step-up growth factor). When the expected return is exactly 0%, or when the annual return’s growth factor happens to equal the step-up growth factor, that denominator becomes 0/0 — a naive implementation would return NaN or crash. This calculator’s engine detects both cases and substitutes the correct mathematical limit so the result stays accurate and finite.