The same machine, running in opposite directions
SIP and SWP are frequently confused because the acronyms differ by one letter, but they sit at opposite ends of an investing life. A Systematic Investment Plan moves money from your bank account into a mutual fund on a fixed date each month. A Systematic Withdrawal Plan moves money the other way — out of the fund and into your bank account, on a fixed date each month. One accumulates, the other distributes.
| SIP | SWP | |
|---|---|---|
| Direction of money | Bank → mutual fund | Mutual fund → bank |
| Life stage | Earning and accumulating | Retired or drawing an income |
| What you fix | The monthly instalment | The monthly withdrawal |
| Units | Bought each month | Redeemed each month |
| Effect of a market fall | Helpful — instalments buy more units | Harmful — more units sold for the same rupees |
| What you ask the calculator | What will my corpus become? | How long will my corpus last? |
| Tax event | None on investing | Capital gains on the gain portion of each withdrawal |
Why a falling market flips from friend to enemy
This is the asymmetry most people miss. During a SIP, a market decline is quietly good news: your fixed ₹10,000 buys more units at the lower NAV, and those extra units are what makes the recovery so profitable. During an SWP, a decline is the reverse — you must redeem more units to raise the same fixed rupee amount, and those units are gone before the recovery arrives. Sequence-of-returns risk, as it is known, is the reason a withdrawal plan deserves a more conservative return assumption than the accumulation plan that preceded it.
How the two connect
The link between them is a single number: the corpus. Your SIP’s total value at the end of the accumulation phase is your SWP’s opening balance. Treating them as two unrelated calculations is how people end up planning a withdrawal against a corpus their contributions were never going to produce.
That is precisely what the combined SIP and SWP calculator is built to prevent. The total value from the SIP side is written directly into the SWP side’s total investment field and stays synchronised as you adjust assumptions, so the two halves of the plan cannot drift apart.
Can you run both at once?
Mechanically, nothing stops you — they are separate instructions and can even apply to the same fund. Financially it is usually incoherent: you would be buying and selling the same asset in the same month, paying costs and possibly tax for no net exposure change. The exception is a deliberate transition, where an existing SWP funds living expenses while a SIP continues in a different fund for a separate goal.
Disclaimer: Every figure on this page is an illustration produced by a compounding formula, not a forecast and not investment advice. Mutual fund returns are market-linked and are neither guaranteed nor uniform year to year. Verify your own plan with a SEBI-registered investment adviser before acting on it.