| Year | Phase | Invested | Withdrawn | Closing corpus |
|---|
A SIP builds wealth through disciplined monthly investing. An SWP turns an existing corpus into a monthly income by redeeming units at regular intervals. Run one after the other and you get a full investing lifecycle: invest steadily while you earn, then draw an income from the same money once you need it. This calculator models both phases together so you can see the whole journey on one timeline instead of checking two separate tools.
It is the same idea mutual fund distributors describe as "invest through your working years, then switch to income mode": run a monthly SIP for as long as you are earning and adding to your corpus, then, from the date you need income, stop the SIP and start an SWP from the same folio or a linked one. The corpus your SIP built becomes the opening balance your SWP draws down.
In this calculator, the field labelled "Starting corpus for SWP" is auto-filled from the corpus your SIP inputs project by the end of the accumulation period. That is the connection: change your SIP amount, duration, return, or step-up, and the SWP starting point updates with it. If you already hold a lumpsum and do not need the SIP phase, edit that field directly, it stays wherever you set it until you click "Use SIP corpus" again.
Start with your accumulation assumptions: how much you can invest monthly, for how long, and at what expected return. Check the projected corpus at the SIP-to-SWP switch point. Then move to the withdrawal side: set how many years you need income for and how much you want each month, and see whether the auto-filled starting corpus supports it. If the corpus depletes early, come back and adjust one variable at a time, a longer SIP duration, a higher monthly amount, a smaller withdrawal, or a longer withdrawal horizon with a lower monthly payout, and rerun the numbers.
Each tool answers a different question. Here is how they compare.
| Aspect | SIP-only calculator | SWP-only calculator | Combined SIP + SWP calculator |
|---|---|---|---|
| Question it answers | How big a corpus will my monthly investing build? | How long will an existing corpus support my withdrawals? | Will the corpus I build actually support the income I plan to draw? |
| Best used for | Goal planning while you are still investing | Retirees or anyone with a lumpsum already in hand | Planning the full arc from working years to retirement income |
| Starting point | Usually zero, or a small lumpsum | A known corpus you enter manually | Auto-linked: SIP's ending corpus feeds the SWP's starting corpus |
| What you see | Total invested, returns, and final maturity value | Total withdrawn, ending corpus, or depletion year | Both, on one continuous chart and year-by-year table |
| Limitation | Does not show what the corpus can later support | Assumes you already have the full corpus in hand | Still needs realistic assumptions in both phases to be useful |
Use the standalone SIP Calculator or SWP Calculator when you only need one side of the picture. Use this combined tool when you want to see whether your accumulation plan actually funds your withdrawal plan.
Work backward from the income you want. Set the SWP inputs first: your target monthly withdrawal, how many years it should last, and a conservative return assumption. Note the corpus that combination needs to avoid early depletion. Then move to the SIP side and adjust the monthly amount, duration, and step-up until the projected accumulation corpus meets or exceeds that number. Testing a few combinations this way is usually more useful than picking one SIP amount and hoping it works out.
The two most common gaps are an accumulation period that is too short for the SIP amount chosen, and a withdrawal rate that is too aggressive relative to the corpus and assumed return. A high step-up on the withdrawal side compounds this, since withdrawals grow every year regardless of how markets perform. Real returns also do not arrive in a straight line, so a plan that only works at an optimistic return assumption is fragile. Stress-test by lowering both return assumptions by a couple of percentage points and see if the plan still holds.
Explore these tools to look at either phase on its own, or to model a step-up in more detail.