India STP Calculator

What a Systematic Transfer Plan does

You have a lumpsum, say a bonus or the proceeds of a property sale, and you want it in equity. Dumping it in on a single day exposes you to one price. An STP parks the money in a liquid or short-duration debt fund of the same fund house and shifts it into the equity scheme in equal instalments, typically over 6 to 12 months. The portion still sitting in debt earns a modest return, the portion already moved earns the equity return, and your average entry price gets smoothed across several market levels. This tool models exactly that: the debt leg shrinks instalment by instalment while the equity leg grows, then the whole corpus compounds for the rest of your horizon.

A 12 lakh lumpsum transferred over a year

Using the default inputs, you start with ₹12,00,000 in a debt fund returning 6%, transfer ₹1,00,000 a month into an equity fund expected to return 12%, and hold the whole thing for 5 years. By the end of the transfer window almost all the money is in equity, and the corpus grows to roughly ₹20.88 lakh after five years. The blended return during the transfer phase sits between 6% and 12%, which is the price you pay for not timing the market. If equity had run up sharply over those twelve months, a one-shot lumpsum would have beaten the STP. If it had fallen, the STP would have won. You are buying smoothness, not maximum return.

The tax detail nobody warns you about

Every transfer instalment is a redemption from the debt fund, and this is where the FAQ's "small tax" understates reality. Since 1 April 2023, gains on debt mutual funds are added to your income and taxed at your slab rate, with no long-term concession and no indexation, regardless of how long you held the units. So if you are in the 30% slab, the small gains your debt leg earns during the transfer are taxed at 30%. It rarely changes the decision because the amounts are tiny, but you should report them. The equity leg, once you eventually sell it, gets the friendlier equity treatment: long-term capital gains above ₹1.25 lakh a year taxed at 12.5%.

Picking the source and target funds

An STP only works between two schemes of the same fund house, so your choice of asset management company matters before you even start. Park the lumpsum in a liquid fund or an ultra-short-duration fund as the source: these carry minimal interest-rate risk, so the money you are waiting to deploy does not swing in value while it sits. Avoid using a longer-duration debt fund as the source, because a rate move could dent the very capital you are about to transfer. On the target side, pick the equity fund you actually want to own for the long run, typically a diversified flexi-cap or large-cap fund rather than a narrow sector fund, since you are committing for years. One operational point people miss: register the STP for a fixed rupee amount per instalment, not a fixed number of units, so the transfer schedule stays predictable regardless of the equity fund's NAV on transfer day. Most platforms let you set the transfer date and frequency, weekly, fortnightly, or monthly; monthly is the most common and keeps paperwork light.

How long should the transfer run?

For most people 6 to 12 months is the sweet spot. Shorter than that and you are barely averaging; much longer and you leave too much money earning debt returns while equity potentially runs away. If markets look stretched, lean toward the longer end. If valuations are reasonable, a shorter STP gets your money working sooner.

STP or a fresh SIP, what is the difference?

A SIP invests new money you earn each month. An STP moves money you already have, in a lump, gradually into equity. If the cash is already sitting in your bank, an STP keeps it earning a debt return during the wait instead of zero in a savings account. If you are investing out of monthly salary, a plain SIP is the right tool.