"How much should I invest?" has no single rupee answer. But it has a clear framework. Here's how to find your number in three steps.
Before a single rupee goes into equity, two things come first: an emergency fund of 6 months' expenses (in an FD or liquid fund), and term insurance if anyone depends on your income. Skipping these is why people panic-sell their SIP at the worst time — a small shock forces them to break long-term money. Secure the base, then invest without fear.
A simple, honest split of take-home pay:
| Bucket | Share of take-home |
|---|---|
| Needs (rent, bills, food) | ~50% |
| Wants (lifestyle) | ~20–30% |
| Invest (long-term SIP) | ~20–30% |
The person earning ₹50,000 who invests ₹12,000 is winning against the one earning ₹2,00,000 who invests ₹15,000. Rate beats size. Early in your career, push the invest bucket as high as you can bear — that money has the most years to compound.
Work backwards from what you want, at ~12% long-term equity returns:
| Goal | Monthly SIP | Roughly becomes |
|---|---|---|
| ₹1 crore in 20 years | ~₹10,000 | ₹1 crore |
| ₹1 crore in 15 years | ~₹20,000 | ₹1 crore |
| ₹5 crore in 25 years | ~₹26,000 | ₹5 crore |
Notice the cost of waiting: the same ₹1 crore needs double the monthly SIP if you start 5 years late. Time does the heavy lifting, not the amount.
Your SIP should grow with your salary. A ₹10,000 SIP that rises 10% a year finishes far ahead of a flat ₹10,000 — often by 50% or more over two decades. The easiest wealth decision you can make is to raise your SIP every appraisal, before lifestyle absorbs the raise.
Don't wait to find the "perfect" amount. Start at a sustainable 20–30% of income today, keep the emergency fund and insurance in place, and step the SIP up every year. Consistency and time beat the size of any single instalment.
Related reading: what a ₹10,000 SIP grows to in 20 years and how to read your real return (CAGR vs XIRR).