तुम्ही प्रत्येक महिन्याला किती इन्व्हेस्ट करावे?

तुम्ही प्रत्येक महिन्याला किती इन्व्हेस्ट करावे?" नवीन गुंतवणूकदारांनी विचारलेला हा सर्वात सामान्य प्रश्न आहे. बहुतांश लोकांना "तुम्ही जे करू शकता त्यासह सुरू करा" किंवा "महिन्याला किमान ₹5,000 इन्व्हेस्ट करा" ची काही आवृत्ती मिळते, असा सल्ला दिला जातो जो विश्वास ठेवण्यासाठी अत्यंत अस्पष्ट आहे किंवा खूपच सामान्य आहे.

प्रामाणिक उत्तर म्हणजे कोणताही सिंगल नंबर नाही. BKC मध्ये ₹35,000 कमविणाऱ्या 24 वर्षांच्या फ्रेशरसाठी योग्य मासिक इन्व्हेस्टमेंट दोन मुलांसह ₹2 लाख कमविणाऱ्या 38 वर्षांच्या मॅनेजरसाठी योग्य नंबर सारखीच नाही. But there is a framework—a simple, sensible one—that works for almost everyone.

This blog walks through it. 

Start with the Only Rule That Matters

Before we get to percentages and rules of thumb, one thing needs to be said clearly. 

The amount you can sustain every month, through good months and bad, is more important than the amount you start with. A ₹3,000 SIP that runs for 20 years without a break will build more wealth than a ₹15,000 SIP that gets paused every time there's a wedding, a bike EMI, or a market crash. 

Consistency beats size. Every single time. 

So the real question isn't "what's the biggest SIP I can start?" It's "what's the biggest SIP I can keep running even in a bad month? 

The 50-30-20 Rule: The Starting Point 

The oldest and still the most useful rule of personal finance is the 50-30-20 split. 

50% of your take-home pay goes towards needs: rent, groceries, EMIs, bills, transport, insurance premiums.  

30% goes towards wants: eating out, OTT subscriptions, weekend plans, shopping, the occasional trip.  

20% goes towards savings and investments. 

That 20% is your investing budget. On a ₹50,000 monthly income, that's ₹10,000. On ₹1 lakh, it's ₹20,000. On ₹2 lakh, it's ₹40,000. 

Now, this rule isn't sacred. If you live in Mumbai, Bengaluru or Delhi and pay 40% of your income in rent, the 50-30-20 split simply won't hold in your first few working years. That's fine. Start with 10%, get to 15% within a year, and push towards 20% as your income grows. What matters is that the number is real and repeatable. 

But Before You Invest a Rupee, Do This 

There's a step most investing guides skip, and it's the one that quietly destroys more portfolios than any market crash. Before you set up your first SIP, build two safety nets. 

आपत्कालीन फंड:

Three to six months' worth of your essential expenses should be saved in a liquid fund or a savings account that you don’t access. This money helps you avoid cashing in your equity SIP when your car breaks down or if you lose your job for two months. Without this safety net, any unexpected expense forces you to dip into your investments, and you miss out on the benefits of compounding. 

Term insurance and health insurance:  

A term cover of roughly 10–15 times your annual income, and a family floater health policy of at least ₹10 lakh. These aren't investments. They are the reason your investments don't get wiped out by a single bad event. 

Only after these two are in place should the monthly SIP question even come up. Investing without an emergency fund is like building a second floor before finishing the walls of the first.

The Goal-Based Way to Decide the Number 

Once the safety nets are in place, the 20% investment budget shouldn't just sit in one SIP. It should be divided among the goals you're saving for. This is where "how much should I invest" changes from a vague question to a specific one. 

Take a simple example. You're 30, earning ₹1 lakh a month, with ₹20,000 available to invest. You have three main goals. A home down payment in 5 years (₹15 lakh), your child's higher education in 15 years (₹50 lakh in today's money), and retirement at 60 (₹5 crore). 

Each of these needs a different SIP amount, because each has a different horizon, a different target, and a different appropriate return assumption. A rough back-of-the-envelope calculation using a 12% assumed return would look something like this: 

• ₹18,000 a month for 5 years compounds to roughly ₹15 lakh (down payment) 
• ₹10,000 a month for 15 years compounds to roughly ₹50 lakh (education) 
• ₹5,000 a month for 30 years compounds to roughly ₹1.7 crore (retirement - a portion of it) 

Add those up and you're already at ₹33,000, more than your ₹20,000 budget. Which is exactly the point. Goal-based planning shows you the honest gap between what you want and what you can afford right now. Then you make choices. Delay a goal, reduce a target, or find ways to earn more. 

The alternative is investing ₹5,000 a month and hoping it works out. That is how most people get to 45 and realise their retirement corpus is nowhere close to what they need. 

The Numbers Every Investor Should Feel in Their Bones 

You don't need a calculator to understand the shape of compounding. Just a few numbers. 

A ₹5,000 monthly SIP at an assumed 12% return grows to about ₹11.6 lakh in 10 years, ₹50 lakh in 20 years, and ₹1.7 crore in 30 years. Notice how flat the first decade looks compared to the last. That's compounding — slow, quiet, and then, suddenly, loud. 

A ₹10,000 monthly SIP over 30 years compounds to roughly ₹3.5 crore. A ₹20,000 SIP over the same period, ₹7 crore. Every extra rupee you invest in your twenties does more work than five rupees invested in your forties, because it gets more time to compound. 

The most valuable thing a young investor has isn't money. It's time. Wasting the twenties waiting to invest "when I earn more" is the single most expensive delay in personal finance. 

Step Up as Your Income Grows 

Here's the trick most people miss. Your first SIP amount is not meant to be your forever SIP amount. 

Every time you get an increment, raise your SIP by half of the increase. If your take-home goes up by ₹8,000, add ₹4,000 to your SIP. You still enjoy the raise. Your lifestyle still improves. But your investing budget grows in step with your income, instead of getting eaten by lifestyle inflation. 

Most fund houses now offer an automatic step-up SIP. You set a 10% annual increase once and forget about it. A ₹10,000 SIP with a 10% annual step-up over 20 years builds nearly 70% more wealth than a flat ₹10,000 SIP over the same period. That is the difference a single switch makes. 

या सर्व गोष्टींच्या अंतर्गत सोपी कल्पना

Don't overthink the starting number. Start with 10% of your income if 20% feels impossible. Start with ₹500 if 10% feels impossible. But start. 

Then focus on three things. Keep the SIP running through good months and bad, step it up every time your income rises, and don't touch the corpus until the goal is due. 

The right monthly SIP amount is the honest, sustainable one you'll still be running ten years from now. Quietly building a corpus you'll be very glad you started when you did.