How much should you really invest every month? There’s no one-size-fits-all answer. Discover how to determine the right investment amount based on your income, goals, life stage and financial commitments—and why investing before spending can transform your wealth-building journey.
“How much should I invest?” is the first question almost every client asks me. Some have heard 10% of salary ; some have heard 20% ; some go by whatever their WhatsApp group tells them. Here’s the honest answer: there is no single magic number. The right amount depends on your income, expenses, EMIs, goals, time horizon and risk appetite. It should not be a rule someone else follows.
Let’s break this down properly.
The Problem With “Just Invest 20% of Your Salary”
You’ve probably heard of the 50-30-20 rule: 50% of income to needs, 30% to wants, and 20% to savings and investments. It’s a reasonable starting point for budgeting. But if you’re serious about building wealth, it’s worth flipping this rule around.
For a committed investor, the goal is:
- 50% of your income → investments
- 30% → needs
- 20% → wants
This isn’t about cutting corners on essentials. It’s about treating investing as a non-negotiable commitment, not an afterthought at month-end.
Let’s say you earn ₹1,00,000 a month. Following the flipped 50-30-20 approach:
- ₹50,000 → Investments
- Of this, 60% can go into SIPs
- The remaining acts as a buffer for lump sum investing when markets correct, or for opportunities you don’t want to miss.
- ₹50,000 (the rest) → Expenses, needs, wants and other commitments
And if you have a surplus left at month-end, that’s a signal to invest it too — not spend it.
Note that you can direct one of the SIPs to create an emergency corpus (debt funds), till you have enough for it.
Compounding only works if your investments are left undisturbed for the long haul. That’s why, before (or alongside) investing, two things deserve equal attention:
- An emergency fund covering 5–6 months of expenses, so a sudden need never forces you to break your investments
- Adequate insurance – a term plan and health insurance are essential, not optional
Everything you invest should ultimately connect back to your goals like what you’re saving for, your time horizon, the corpus you need, and how you’ll get there.
The moment your salary is credited, your investment should be the first thing that leaves your account – not the last.
- If your salary comes on the 1st, set your SIP date for the 2nd
- Let the SIP auto-debit before you have a chance to spend
- Spend from what remains, guilt-free
This one shift investing before spending, instead of spending before investing – is often the biggest driver of long-term financial discipline.
Your Investing Style Should Match Your Life Stage
In Your 20s
This is when time is your biggest asset. With decades ahead of you, you can afford a higher equity allocation and a more aggressive approach, because compounding needs time to work in your favour.
In Your 30s
Home loans and other EMIs typically enter the picture. This is the stage to balance your EMI outgo with your investment commitments carefully, rather than letting one crowd out the other.
In Your 40s
Your investing should get sharper and more goal-specific. Your risk score, the time left to each goal, and your remaining working years all start to matter a lot.
Nearing Retirement
The priority shifts from growth to capital protection. This is when preserving what you’ve built matters more than chasing higher returns.
Fixed vs Variable Income
Salaried employees: A steady monthly income makes disciplined SIPs easy to sustain and this is your biggest advantage.
Freelancers and business owners: Income can be unpredictable, so a large, fixed SIP may feel like a burden. A better approach is to keep a modest, manageable SIP running and invest more aggressively through lump sums whenever cash flow allows.
Step Up Your SIP Every Year
Every time your income rises through an increment, bonus, incentive, promotion or business profit – increase your SIP before you increase your lifestyle.
Even a modest step-up, say 10% every year on a ₹5,000 SIP, can make a meaningful difference to the corpus you build over the long term, since annual increases compound alongside your existing investment. Actual outcomes will always depend on market performance, but consistently increasing what you save is entirely within your control.
Let your investments grow first – your lifestyle will still improve, just without derailing your wealth-building journey.
If you’d like help figuring out how to structure your SIPs and lump sums the right way and which funds to suit your life stage and goals – let’s have a conversation. Reach out to Milestones2Wealth to start your personalised investment plan today.
