STP vs SIP — do I need both?
STP moves a lump that already exists. SIP catches salary. You need the one that matches the cash in the room.
Skip to the calculator below this article
Two engines, two kinds of cash
STP moves a lump that already exists. SIP catches salary as it arrives. Using both is allowed. Confusing both is how people park ₹0 in equity for six months “until they decide.”
SIP = debit from bank every month. STP = debit from a liquid/overnight fund into equity every month. Same habit, different source account.
If you skip this step, the rest is theatre.
Someone in Bhopal will still tell you a story that skips the EMI night. Ignore that person.
It is arithmetic plus behaviour. The arithmetic is easier.
A ₹8 lakh bonus dumped into a mid-cap on a random Thursday is a timing confession. Parking it in liquid and STPing ₹40,000 is a truce.
Discomfort here is a signal. A 15% slider is not.
Nobody hands out a medal for pretending your Excel is braver than your salary.
Do not fire the SIP because STP showed up.
When a bonus should not become a Monday lump
If this month’s money is salary, SIP is enough. Do not invent an STP so the app looks busy.
If a lump already landed (bonus, plot sale, gift), park in liquid the same week, then start STP into your existing equity funds.
Open a calculator and type the ugly version first—₹8 lakh sitting in savings at 3% for 11 months “because STP feels complicated,” while a SIP of ₹8,000 is the only thing actually invested.
Round, optimistic inputs are how people sleep until the third bounce.
Match STP size to a 6–18 month window. A 40-year STP on ₹8 lakh is how you stay in cash forever.
You do not earn extra marks for running STP and SIP on ₹2,000 each. Complexity is not a return.
If you cannot explain the result to a slightly impatient parent, you do not understand it yet.
Jargon that pretends you are advanced
Stopping the SIP because you started an STP. Salary did not retire. The SIP should not either.
STPing from equity to equity as a personality. That is a switch with extra forms.
Leaving the lump in “cash till I research” until the research becomes a cricket season.
If a caption fits in eight words, it skipped the messy month.
Your cousin’s 2017 small-cap luck is not a policy.
A plan that never gets a yearly refresh is a framed poster.
Bhopal is full of people who had a decent plan in 2022 and a folklore in 2026. The folklore started as an unopened app.
Idle savings is also a decision.
A simple pairing
Only salary, no lump: one or two SIPs. Stop collecting products.
Lump ≥ ₹3–4 lakh and a 7+ year horizon: liquid + STP over 6–12 months, SIP continues.
Lump needed in <3 years: maybe it should not STP into equity at all. Debt/hybrid, then go live your life.
Order of operations still applies: high-cost debt, then a cash buffer, then this debate.
Investing while revolving a 36% card is theatre.
A thinner SIP or a slower prepay still exists. A six-month disappear does not.
A smaller SIP or a shorter loan goal beats a heroic screenshot you cancel in six weeks.
₹8 lakh bonus plus ₹8,000 salary SIP
₹8 lakh bonus, ₹50,000 STP for 16 months into the same funds as your ₹8,000 SIP. Two pipes, one allocation.
Dumping the ₹8 lakh on a single green Tuesday can look genius or cursed within a quarter. STP refuses that coin flip.
₹1.2 lakh leftover in savings after a wedding, STP ₹20,000 for 6 months. Small lumps still deserve a plan, just not a 12-fund zoo.
None of this is a guaranteed NAV or a sanctioned loan. It is a map.
If the plan only works at 18% returns or a 6% home loan forever, it is not a plan.
Drop the return a couple of points and raise the EMI. If it breaks, you learned cheaply.
Keep a 10% haircut for tax, fees, or the extra month the builder delays.
No lump? Skip STP without guilt.
Name the cash, then pick the tool
SIP for flows. STP for piles. If you have only flows, you do not need STP yet.
If you have a pile and only a SIP, the pile is still on leave in savings.
The unsexy month-on-month debit still beats a new “system” in April.
Calendar reminder beats a quote about discipline.
A Bhopal cousin who wants a shortcut can get this page. They cannot get your leftover salary.
And please date your spreadsheet. Future you will not remember which fantasy version this was.
Sketch, then confirm with the actual lender or a CA. This page does not sign cheques.
Change the numbers in the calculator above and see the result on this page.
Estimates only—not personalised financial, tax, or investment advice. Markets, loan rates, and tax rules change. Confirm numbers with your lender, CA, or advisor before acting.