Got your bonus or inheritance money? Here's how to invest

You've just landed a bonus. Or inherited some money. Or sold that long-held plot. Now you've got a bag of cash and a choice to make: Should you invest the money in one go? Or ease in gradually?

Sure, investing the entire amount right away might pay off. But what if markets drop next week? You're left with regret.

That's why we at Value Research often suggest starting an SIP in mutual funds . In other words, you spread the money over a period of time. Why? Because you'll only know the market bottom or peak in hindsight.

Why lumpsum investing feels tempting

When you've got cash in hand, the instinct is to 'put it to work'. Plus, if you time it right, the payoff can be big.

But history shows that timing the market is like trying to catch the fastest queue at a Metro station. It looks easy, but it isn't.

Suggested read: SIP vs lumpsum: There's one clear winner!

Since a stock market's short-term movements are unpredictable, a sharp fall soon after you invest can quickly wipe out confidence, and return.

Take 2008, for example. By June 20, the market had already fallen 30 per cent from its peak. Thinking the worst was over, you invested Rs 1 lakh. But the decline continues, and by the time the actual bottom hits, your investment is worth just Rs 58,000 — a 42 per cent loss, despite entering after a major fall.

Cut to 2010-11. This time, you're cautious. The market drops 10 per cent... then 20... then 25. You wait for more pain. But the bottom comes at 27 per cent, and the market starts recovering. You end up missing the rally altogether.

In both cases, trying to time the bottom backfires. Either you're too early or too late.

Even small delays can be costly

To understand this better, we looked at historical bottoms of major market crashes where the Nifty 50 TRI had fallen at least 20 per cent from its recent peak. These are moments when many investors feel tempted to act, thinking they're grabbing a bargain.

We picked four such instances over the past 20 years: 14 June 2006; 27 October 2008; 20 December 2011; 25 February 2016. Only periods with nearly 10 years of data available after the investment date were considered, which is why the Covid crash was excluded from this analysis.

Let's say you invested Rs 1 lakh in the market at each of these points. What happens if you waited just a month or two longer—thinking the market might fall more? You'd lose out on a lot of money— in some cases, mistiming the bottom by just two months meant ending up with up to 15 per cent less, as the table below shows.

But SIPs make timing less critical

Now, what if you staggered your Rs 1 lakh over 12 months instead?

Sure, lumpsum strategy helps you earn more money but the market lows are geared to help such investments. But this would only happen if you are super lucky and guess the market bottom at the right time.

Suggested read: Should you strike when the market is cold?

The point we are making here is different, though. If you check the last column of the lumpsum and SIP tables, you'd notice that lumpsum investors have a much smaller corpus for even slight delays, while SIP investors see only a marginal impact. In fact, the maximum difference in corpus between starting an SIP at the market bottom and with a two-month delay was just 3.9 per cent — compared to a much steeper 15 per cent gap for lumpsum investments.

Moreover, starting an SIP has another major upside: Rupee cost averaging. Simply put, you buy more units when prices are low and fewer when they're high.

SIPs protect you even at market peaks

Remember, lumpsum investment actually earns you a higher corpus if you invested at a market bottom, as you saw in the above section?

Now, let's turn the tables and check what if the market crashes right after you start investing.

The lumpsum investment strategy won't look very smart in this case.

But SIPs? They're built for this.

Here's how both lumpsum and SIPs performed when started at historical market peaks:

How long should you spread your lumpsum?

A reliable way to decide is to let the size and significance of the money guide your approach. A useful thumb rule: Spread the investment over half the time it took you to earn that money.

• If it's your annual bonus, a period of up to 6 months is usually enough to stagger your investment.
  
• If it's a once-in-a-lifetime windfall, like your superannuation benefit or a large inheritance, opt for a longer staggering period, up to three years. This allows you to capture a broad part of a market cycle while managing downside risks.

That said, in no scenario should the investment period exceed three years. Beyond that, the money remains idle for too long and misses the opportunity to grow.

So while we've used a 12-month staggering period in our examples for simplicity, the actual duration should reflect your unique context and risk appetite.

How to implement a staggered investment

If you're wondering how to practically carry this out, there are two easy options:

• Start a monthly SIP in your chosen equity mutual funds, deploying a fixed amount every month from your bank account.
  
• Alternatively, you can move the money from your bank account to a liquid or a short duration fund, and set up a Systematic Transfer Plan (STP) into your target equity funds.

This way, your money isn't lying idle because cash kept in a liquid or short-duration debt fund would generally fetch you higher returns than a bank savings account.

More importantly, you ringfence that money, helpful if you fear consuming it otherwise, if kept in a bank account.

Final word: Play it safe, stay invested

Sitting on a lump sum? The urge to 'act smart' is strong. But markets don't reward timing. They reward time.

Instead of guessing the bottom or fearing the peak, SIP/STP your way in. You'll invest smarter, sleep better and stay on track for long-term wealth.

Also read: All roads to wealth creation go through SIPs

This article was originally published on May 17, 2025.