“How much should I invest every month?” is one of the most common questions in personal finance, and also one of the most poorly answered — most advice either gives a generic percentage with no context, or skips straight to product recommendations. Here’s a more practical way to think about it.
Start With Your Goals, Not a Percentage
Generic rules like “invest 20% of your income” are a reasonable starting point, but they ignore what you’re actually investing for. A more useful approach is to list your specific goals — retirement, a child’s education, a home down payment — with a target amount and a timeline for each, then work backward to figure out what monthly SIP gets you there. This is exactly why “invest more” isn’t actionable advice on its own; “invest ₹12,000/month for 15 years to fund your child’s education” is.
The 50-30-20 Starting Framework
If you’re not sure where to begin, a common budgeting framework allocates roughly 50% of take-home income to essential expenses, 30% to discretionary spending, and 20% to savings and investments. That 20% isn’t a hard rule — if you’re starting late or have aggressive goals, you may need to push it higher, and if you’re early in your career with lower income, even 10-15% consistently invested is far better than waiting until you can afford the “ideal” number.
Increase Your SIP as Your Income Grows
A step-up SIP — increasing your monthly investment by a fixed percentage each year, often in line with salary increments — is one of the most effective and least painful ways to invest more over time without feeling a pinch in your monthly budget. Someone who increases their SIP by even 10% annually ends up investing substantially more over a 15-20 year horizon than someone who keeps the same fixed amount throughout, simply because the increases compound alongside the returns.
Don’t Let Insurance and Investment Get Mixed Up
A common mistake in India is treating insurance-linked investment products (like ULIPs or endowment plans) as the primary way to invest, when pure term insurance plus separate mutual fund SIPs almost always works out cheaper and more transparent for the same level of protection and growth. Keep the two goals — protecting your family financially, and growing your wealth — separate, and you’ll generally get better outcomes on both fronts.
Work Out Your Own Number
Rather than guessing at a monthly figure, use our SIP calculator to project what a given monthly amount grows into, or our Retirement and Child Goal calculators to work backward from a specific target and timeline.