Rupee Cost Averaging in Mutual Funds & SIP Explained

Investing in mutual funds through an SIP is a popular way for people to build wealth over the long term. One important concept associated with SIP investing is rupee cost averaging. It explains how investing the same amount across different market conditions can result in buying more mutual fund units when prices are low and fewer units when prices are high.

This article explains rupee cost averaging meaning, how it works in SIP, its benefits and everything else you need to know.

What is Rupee Cost Averaging?

Rupee cost averaging is an investment approach in which a fixed amount is invested at regular intervals. Investments are made regardless of the prevailing market price or Net Asset Value of the mutual fund. In an SIP, the same investment amount is used to purchase mutual fund units periodically.

• When the NAV is low, the fixed investment amount purchases more units. 
• When the NAV is high, the same amount purchases fewer units. 

Over multiple instalments, this can help average the purchase cost of the units acquired.

For example: 

You invest ₹5,000 in an SIP. 

• If the NAV is ₹20, you receive 250 units. 
• If the NAV falls to ₹10, the same ₹5,000 buys 500 units. 

Therefore, your investment automatically purchases more units when the fund's NAV is lower.

Rupee cost averaging in SIP is therefore closely associated with SIPs. It encourages investors to remain invested through different market conditions instead of making investment decisions based on short-term price movements.

Rupee Cost Averaging in SIP: How Does It Work?

When you make an online investment in mutual funds, RCA follows this simple process::

• Step 1: You select a mutual fund scheme and decide on a fixed SIP amount.
• Step 2: The amount is invested at a predetermined frequency, usually monthly.
• Step 3: Units are allotted according to the prevailing NAV on the applicable investment date.
• Step 4: When the NAV is high, your fixed amount buys fewer units.
• Step 5: When the NAV is low, the same amount buys more units.
• Step 6: Over time, the cost of the units purchased gets averaged across different NAV levels.

This shows the basic principle of SIP rupee cost averaging. The investment amount remains constant while the number of units purchased changes according to the NAV.

Rupee Cost Averaging Formula

The rupee cost averaging formula can be used to determine the average purchase cost of mutual fund units:

• Average Cost per Unit = Total Amount Invested ÷ Total Number of Units Purchased

For example, you invest ₹30,000 through six SIP instalments and accumulate 1,664.94 units. Your average cost per unit would be:

₹30,000 ÷ 1,664.94 = approximately ₹18.02 per unit

The calculation demonstrates how purchasing different quantities of units at different NAVs results in an average cost.

It is important to distinguish this average purchase cost from the arithmetic average of the NAVs. Since a fixed amount buys different numbers of units at different NAVs, lower NAVs have a greater influence on the average purchase cost. This is because more units are purchased at those levels.

Example of Rupee Cost Averaging When Markets Fall

Consider a SIP investment online of ₹5,000 per month. Suppose the NAV starts at ₹24 and subsequently moves through different levels as the market declines and recovers.

• Total investment: ₹30,000

• Total units purchased: 1,664.94 units

This is the central mechanism behind rupee cost averaging in SIP. You do not need to increase your investment when the market falls. Your fixed SIP amount automatically purchases more units because each unit costs less.

However, a lower NAV does not automatically mean that an investment will generate profits. The value of the investment ultimately depends on how the mutual fund performs in the future.

Example of Rupee Cost Averaging When Markets Rise

Rupee cost averaging in SIP works in the opposite direction when the NAV rises. Suppose your SIP remains ₹5,000 per month while the NAV increases:

• Total investment: ₹30,000
• Total units purchased: 1,581.07 units

This does not mean that buying fewer units is necessarily negative. It simply shows that each unit costs more. Over time, an SIP can continue purchasing units through both rising and falling markets.

Importance of Rupee Cost Averaging in Mutual Funds

Rupee cost averaging is important because market timing is difficult. Let us take a look at the importance of this approach for mutual funds in India:

1. Helps Manage Market Volatility

One of the rupee cost averaging benefits is that it can help manage the impact of short-term market volatility. A fixed SIP amount buys more units when prices are lower and fewer units when prices are higher. This spreads investments across different market levels instead of concentrating the entire investment at one price.

2. Encourages Disciplined Investing

SIP investing creates a predetermined investment routine. Investors commit to investing a fixed amount at regular intervals, which can encourage consistency. This discipline can be particularly useful for long-term financial goals because investors do not have to make a fresh investment decision every time the market moves.

3. Reduces the Need to Time the Market

Trying to determine the exact market bottom or top can be challenging. Rupee cost averaging in SIP allows investors to continue investing without having to predict short-term movements. The investor follows the SIP schedule regardless of whether the market is bullish or bearish.

4. Potential for a Lower Average Purchase Cost

When markets decline, a fixed SIP amount buys more units. If the mutual fund's NAV subsequently recovers, those additional units may contribute to the growth in the investment's value. Therefore, consistent investing during market declines can potentially help reduce the average purchase cost over an extended period.

5. Supports Long-Term Wealth Creation

Rupee cost averaging works alongside the long-term nature of SIP investing. Regular investments, combined with the potential effect of compounding over an extended period, can help investors work towards long-term financial goals such as retirement or children's education.

Rupee Cost Averaging vs Lump-Sum Investing

The primary difference between the two approaches is the timing of investment.

In lump-sum investing, a large amount is invested at one time. The investor purchases units according to the NAV applicable to that investment. There is no subsequent averaging through additional investments unless the investor makes further purchases.

With rupee cost averaging, the investment is divided across multiple instalments. The investor purchases units at different NAVs, resulting in different quantities of units at each investment interval.

For example:

• If ₹30,000 is invested as a lump sum when the NAV is ₹24, the investment purchases 1,250 units. 
• With an SIP, the same ₹30,000 can be distributed over six months, allowing the investor to purchase different quantities depending on the NAV during each month.

Neither approach is universally superior. The suitability depends on the investor's financial circumstances, goals, risk tolerance, available funds and market conditions.

Can Rupee Cost Averaging Reduce Investment Risk?

Rupee cost averaging can help reduce the impact of investing a large amount at an unfavourable price because investments are spread across different NAV levels. It can also reduce the need for investors to make emotionally driven timing decisions.

However, it does not eliminate investment risk. Mutual funds are market-linked investments, and their value can decline. RCA does not guarantee profits, prevent losses or ensure that the average purchase price will always be lower than the current NAV. Its primary role is to provide a disciplined framework for investing across market conditions.

Limitations of Rupee Cost Averaging

RCA offers several advantages. However, it also comes with its own limitations:

• It does not guarantee returns. 
• It cannot protect you from losses if the chosen mutual fund performs poorly. 
• It may also not always outperform a lump-sum investment.

Therefore, the RCA should be viewed as an investment discipline rather than a guaranteed return-generating strategy.

Conclusion

Rupee cost averaging in SIP is an important feature of SIP investing. By investing a fixed amount regularly, investors purchase more mutual fund units when NAVs are lower. Similarly, fewer units are purchased when NAVs are higher. Over time, these purchases can result in an averaged cost per unit.

The approach can support investors working towards their financial goals. My Mudra will help you understand how the RCA impacts your mutual funds over time. Get assistance from our dedicated team of experts as well as use our online SIP calculator, completely free of cost to make better investment decisions. 

 

Also Read:
- Best SIP Plan for 3 Years: Top SIP Plans for 3-Year Investment
- Mutual Funds for Retirement Planning: Best Funds, SIP Strategy & How to Build a Retirement Corpus