STP Calculator
See how a systematic transfer plan moves money from a source fund into a target fund. Enter the lump sum, the monthly transfer and both returns, then press Calculate to see how each sleeve grows.
Written by TopicDrill Editorial Team·Updated June 2026
Transfer in motion
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How the STP calculator works
The tool runs two funds side by side, month by month. The source fund earns its return on whatever balance remains, then a fixed amount is carved out and moved into the target fund. The target fund earns its own, usually higher, return on everything it has received so far. Over time the balance drains from one sleeve and builds in the other.
The chart shows the shaded target fund rising as transfers accumulate, while the dashed line tracks the combined value of both sleeves. Because the idle source money keeps earning, the total rarely sits still, even before a single rupee reaches the target.
A quick example
Park 6,00,000 in a debt fund earning 6 percent and transfer 10,000 a month into an equity fund returning 12 percent over 5 years. You move 6,00,000 across in instalments, the source keeps earning while it waits, and the combined value typically lands well above the starting lump sum thanks to the higher target return.
Things to keep in mind
Equity returns are not fixed, so the target rate here is an assumption, not a guarantee. Treat the figure as a planning estimate and revisit it as markets move. The Securities and Exchange Board of India explains fund basics at investor.sebi.gov.in. If you would rather invest fresh money each month instead of transferring a lump sum, compare it with our SWP calculator.
Frequently asked questions
What is a systematic transfer plan?
A systematic transfer plan, or STP, parks a lump sum in one fund and moves a fixed amount into another fund at regular intervals. It is commonly used to shift money gradually from a low risk debt or liquid fund into an equity fund, so you average into the market instead of investing everything at once.
How does an STP differ from a SIP?
A SIP invests fresh money from your bank account every month. An STP moves money you already invested from one fund to another. With an STP the cash waiting to be deployed keeps earning the source fund return, which a SIP from a savings account does not.
What return does the source fund earn during an STP?
While money sits in the source fund waiting to transfer, it still grows at that fund's return, often around 5 to 7 percent for a debt or liquid fund. This tool applies the source return to the remaining balance every month before the transfer, so the idle cash is not treated as dead money.
What happens when the source fund runs out?
Transfers can only move what is left in the source fund. If the lump sum and its growth are smaller than your total planned transfers, the source eventually empties and the final transfer is whatever remains. The calculator flags the month this happens so you can adjust the amount or the horizon.
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