how does anyone compute the gain on redemption of mutual fund if rs.10000 is invested in 2005 and now rs.50000 is redeemed

Ans: You are thinking in the right direction. Streamlining your mutual fund portfolio is a smart move. Managing fewer, better-performing funds will help you get more focused growth.

You are planning to redeem a fund that has underperformed. That shows your awareness as an investor. Let us now look at the right way to reinvest the amount. Your investment horizon is long—15 years—which is an advantage.

Let us evaluate every angle in detail.

Why It’s Okay to Exit an Underperforming Fund
You mentioned this fund has only 5% weight in your portfolio. It has not beaten its benchmark. That’s a clear red flag.

Reasons to exit:

Fund not beating benchmark for 3 years or more

Fund manager or strategy changed

Poor consistency in performance

Other funds doing better in same category

Selling such funds is wise. It makes your portfolio clean and growth-focused.

One bad performer can pull down overall return. Removing it improves portfolio efficiency.

You made a good decision.

Where to Reinvest the Redeemed Amount
After selling, your goal is to reinvest in another mutual fund. Let us plan it properly.

You asked whether to do SIP or lumpsum. Both are useful, but must be used wisely.

First, identify where this money should go.

What type of fund should you choose:

If your existing fund mix is strong, add to an existing winner

Or choose a new fund with consistent 5-year and 10-year track record

Choose only actively managed funds, not index funds

Why avoid index funds:

Index funds copy the market without intelligence

They fall when the market falls. No protection

No chance to beat benchmark

Passive nature reduces wealth-building capacity

Fund manager has no freedom to select better stocks

Actively managed funds give you:

Expert decision-making

Freedom to shift between sectors

Better downside protection

Superior long-term results in Indian market

So always prefer actively managed mutual funds via regular plans.

SIP vs Lumpsum: Which One is Better?
Let us now come to your main question.

You want to know how to reinvest the amount. SIP or lumpsum?

Your investment horizon is 15 years. This is very long. So you can take equity exposure fully.

Still, timing matters when investing lumpsum.

Let us assess both methods side by side:

When Lumpsum Makes Sense
Lumpsum means investing full amount at once. It works in these conditions:

Market is already corrected or trading low

You are not emotionally affected by short-term falls

You will stay invested for full 15 years

You have chosen a good fund with strong past record

You don’t need this money for short-term goals

Benefits of lumpsum in long-term:

Full compounding starts from day one

Money is fully exposed to market

No waiting time, no idle money

Higher returns if market performs well after entry

But don’t forget, lumpsum needs mental stability.

What if market falls after lumpsum?

You may feel anxious

You may exit early due to fear

Short-term losses can affect your patience

That’s why timing does affect short-term performance. But not long-term growth if you stay invested for 15 years.

When SIP is Better
SIP is the habit of investing every month.

Even for lumpsum amounts, you can do STP (Systematic Transfer Plan).

STP means:

Keep the lump amount in liquid fund

Transfer fixed amount every month into the equity fund

Example: Rs. 50,000 per month for 6–10 months

Why STP is useful:

Reduces risk of market timing

Avoids investing entire amount at peak

Keeps you emotionally stable

Avoids regret in case of short-term correction

Creates smoother entry into equity

Use STP when:

Market is at all-time highs

Volatility is increasing

You are not sure about market direction

You want peace of mind during investment

So, STP is a balanced way to invest lump amounts.

Will Lumpsum Affect Compounding?
This is an important question.

Let us understand compounding clearly.

Compounding depends on:

Time invested

Return generated

Amount invested

Whether you do lumpsum or SIP, the key is how long money stays invested.

Lumpsum helps compounding start early. SIP creates compounding gradually.

In long term (15 years):

Lumpsum grows faster if invested at right level

SIP grows steadily but reduces entry timing risk

Both will give good results if fund is right

So yes, lumpsum helps compounding better if done at right time.

But STP gives you that benefit with safety.

You get smoother growth and still early compounding.

Ideal Strategy for Your Case
Let us now give you a proper, full-scope recommendation.

Step-by-Step Plan:
Redeem the underperforming fund.

Park the money in a liquid mutual fund (not savings account).

Start a 6-month STP to a high-quality active mutual fund.

Choose the fund after checking its 5-year, 10-year consistency.

Avoid new index funds or ETFs.

Use regular plans through Certified Financial Planner channel.

After STP ends, monitor that new fund every year.

This plan will:

Reduce timing risk

Start compounding early

Bring emotional comfort

Keep your investing smooth

Increase overall return stability

Additional Things to Keep in Mind
Since your money is being shifted, some more factors to remember:

Mutual Fund Capital Gains Tax Rules (Updated):

Equity fund LTCG above Rs. 1.25 lakh taxed at 12.5%

STCG (below 1 year) taxed at 20%

These are recent rules. Plan redemptions smartly

Avoid frequent switches to reduce tax impact

Emotional Behaviour Risk:

Do not panic if market dips during STP

Do not stop investing after seeing short-term fall

Compounding works best when you do not interrupt

Yearly Review Required:

Check your fund’s performance yearly

Compare with peers in same category

Use this to decide future additions or redemptions

Work with a CFP to do regular health check-up of portfolio

Finally
You are thinking smart. Trimming funds and reallocating is a sign of maturity.

But always shift money with a goal and method.

Use these steps:

Avoid underperforming and index funds

Reinvest using STP into active mutual funds

Prefer regular plans with CFP guidance

Let money stay invested for full 15 years

Don't check NAV daily. Focus on yearly growth

Review fund quality yearly

Avoid timing the market too much

Stick with this method and your wealth will grow steadily.

Best Regards,
K. Ramalingam, MBA, CFP,
Chief Financial Planner,
www.holisticinvestment.in
https://www.youtube.com/@HolisticInvestment