What is an STP?
A Systematic Transfer Plan moves a fixed amount every month from one fund to another within the same AMC — almost always from a liquid or debt fund into an equity fund. You invest the lumpsum once, into the quiet fund; the AMC then drips it into the market on a schedule.
It exists for one human reason: handing over a bonus, an inheritance or a property sale to the equity market on a single day feels like betting, and people who feel they are betting tend to wait — often forever. The STP converts one scary decision into many small automatic ones.
What the calculator shows
Three ends of the same story, over the same months:
- The STP path — your money earns the debt rate while it queues, and each instalment then compounds at the equity rate.
- All-in on day 1 — the whole lumpsum at the equity rate from the start.
- Never leaving debt — the do-nothing baseline.
With steady assumed returns, day-1 investing usually ends ahead — money that enters earlier compounds longer. The STP's case is not the average outcome; it is the bad month. If the market falls 15% during your transfer window, the STP bought that fall in instalments while the day-1 investor took it in full.
Practical points
- 6–18 months is the common window. Much longer, and most of the corpus idles at debt returns while equity compounds without it.
- Every transfer is a taxable redemption from the source fund. Post-2023 debt fund gains are taxed at your slab — the amounts per instalment are small, but they are reportable. Our MF tax calculator has the rules.
- The source fund matters less than people think. Liquid vs ultra-short changes the outcome by decimals; the transfer window and the equity fund choice dominate.
- An STP is not a SIP. A SIP deploys income you have not earned yet; an STP deploys money you already hold. If the lumpsum is sitting in your savings account, you are already running an STP — with a worse source rate.