STP Calculator

Project systematic monthly transfers between a source investment and a destination investment.

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Enter an exact value or use a slider. Your result updates instantly.

Formula, example and assumptions
Combined projected value₹11,34,210.50

Money to transfer

Indian rupees
Indian rupees

Returns and transfer timing

%
%
Transfer timing each month

Your result

Local calculation
Combined projected value₹11,34,210.50About ₹11.34 lakh

The combined value adds the remaining source fund and destination fund after the transfer period. Transfers move existing money between funds; estimated growth is separate from the amount transferred.

Monthly transfer
₹50,000
Transfer period
18 months
Transfer timing each month
Beginning
See how this is calculated

Result breakdown

Source balance remaining
₹1,48,548.63 About ₹1.49 lakh
Destination balance
₹9,85,661.87 About ₹9.86 lakh
Total transferred
₹9,00,000.00 About ₹9 lakh
STP instalments executed
18
Estimated growth
₹1,34,210.50 About ₹1.34 lakh
Projection over timeValues progress from ₹10,00,000.00 to ₹11,34,210.50.
StartEnd

Each transfer is modelled at the beginning of the monthly period.

Check the inputs and method

These are your current inputs, not the worked example further down the page.

Starting source investment
₹10,00,000
Monthly transfer
₹50,000
Transfer period
18 months
Expected source annual return (%)
6 %
Expected destination annual return (%)
12 %
Transfer timing each month
Beginning

Method

Monthly growth factors are a=(1+source annual return/100)^(1/12) and b=(1+destination annual return/100)^(1/12). Start source S=initial investment and destination D=0. For beginning timing, transfer X=min(monthly transfer,S), then S=(S−X)a and D=(D+X)b. For end timing, first set S=Sa and D=Db, then X=min(monthly transfer,S), S=S−X and D=D+X. Repeat for the chosen months. Final value=S+D; growth=final value−initial investment; total transferred=ΣX.

Read the worked example and assumptions

How this calculation works

Model a scheduled transfer between two existing investment balances, beginning with all money in the source. A transfer is not new money: it reduces the source and increases the destination by the same amount. The combined value changes only through the two assumed returns; the last transfer can be smaller if the source is nearly exhausted.

Monthly growth factors are a=(1+source annual return/100)^(1/12) and b=(1+destination annual return/100)^(1/12). Start source S=initial investment and destination D=0. For beginning timing, transfer X=min(monthly transfer,S), then S=(S−X)a and D=(D+X)b. For end timing, first set S=Sa and D=Db, then X=min(monthly transfer,S), S=S−X and D=D+X. Repeat for the chosen months. Final value=S+D; growth=final value−initial investment; total transferred=ΣX.

Worked example

This example uses illustrative inputs. Your current result is shown above.

Enter ₹1,00,000 initially, ₹30,000 monthly transfers, 4 months, beginning timing and 0% returns in both funds. Transfers are ₹30,000, ₹30,000, ₹30,000 and ₹10,000. Four instalments move ₹1,00,000; source ends at ₹0, destination at ₹1,00,000 and combined growth is ₹0.

Assumptions and limits

  • Only the entered starting capital is available; no outside deposits replenish the source.
  • Each fund has its own constant effective annual return and transfers use the selected monthly timing.
  • Redemption taxes, exit loads, transaction delays and scheme-level transfer restrictions are excluded.

Questions people ask

Why is the final transfer smaller than the regular amount?

The model caps it at the remaining source balance. It does not borrow money or let the source become negative to complete an instalment.

Should I add total transferred to the final value?

No. Transfers are internal movements of the same capital. The final combined value already includes what remains in both funds.

Does the transfer timing matter?

Yes. A beginning transfer earns that month’s destination return; an end transfer first leaves the money exposed to the source return for that month.

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