Three rules. Stuck to the fridge.
The math is the easy part. The rest is structuring the next bonus so the brain does not get the chance to label the rupee before the sweep finishes.
01
Rupees are fungible. The envelope is a brain bug.
Salary, bonus, refund, gift, capital gain . one purchasing power, four labels. The label is what the brain sees. Treat the bonus rupee the same way you treat the salary rupee on the tenth of March.
02
The bonus is the highest leverage compounding moment of the year.
The lifestyle baseline has not adjusted to the windfall yet. The household budget already balances without it. The marginal utility of one more spend is lower than the marginal utility of thirty extra years of growth. This is the easiest invest decision you will make all year, while the rupee is still unlabelled.
03
Sweep windfalls inside forty eight hours.
Decide the sweep percentage before the bonus lands, not after. Eighty pct into the existing SIP or portfolio is a sane default for a salaried earner. The remaining twenty pct can fund the splurge guilt free and still costs twelve lakh in thirty years instead of sixty.
Closer
The brain calls it found money. The compounding calls it the rupee you never gave back.