What corpus pays your monthly income?
A common rule of thumb: a corpus can safely pay out a small percentage of itself each year without running down. Pick your target income and a safe withdrawal rate to see the corpus behind it.
How this is worked out
Corpus needed equals your yearly income divided by the safe withdrawal rate. At a 6% rate, an income of ₹1,00,000 a month (₹12,00,000 a year) needs about ₹2 crore. A lower rate is more cautious and needs a larger corpus.
The figure is in today's rupees. By the year you stop working, inflation makes the rupee figure larger; Synarsi works that out from your own dates.
With the pre-tax box ticked, the figure is grossed up so that what reaches your hand, after tax on the withdrawals, still equals your target. It assumes a 60% equity and 40% other mix and India's current long-term equity tax rules; your real mix and slab may differ.
Synarsi does this continuously with your real numbers. See how it works.