What this SIP calculator estimates
Project monthly investments with an optional annual step-up, starting lump sum and inflation assumption, or solve for the monthly investment needed for a target. Returns are hypothetical, not guaranteed; investments can lose value.
Calculation
For a flat SIP, FV = P × [((1+i)^n − 1) / i] × (1+i), where i is the annual percentage input divided by 1,200 and n is the number of months. At a zero rate, future value is the invested total. The implementation adds each monthly SIP before applying that month's growth and increases the contribution after each year. The lump sum compounds monthly too.
Inflation and tax limits
The real-value output discounts the hypothetical corpus using your inflation input. The optional equity tax estimate subtracts 12.5% of positive gains above a single ₹1.25 lakh allowance. It is a simplified scenario, not a tax computation: it does not track each installment's holding period, short-term gains, other gains using the allowance, cess, surcharge or future rule changes. Verify current rules and your circumstances with a qualified adviser.
Choosing assumptions
Use several conservative return and inflation scenarios. Historical category averages are not forecasts. A SIP spreads purchase dates but does not guarantee profit or superiority to a lump sum. Choose contribution levels, asset allocation and withdrawals for your goals, risk tolerance and liquidity needs.