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Should you use your stock market profits to prepay a home loan?

28 Sep 2021 - Contact Sayan Sircar
8 mins read

This post shows how goal-based investing can answer whether you should or should not prepay your home loan.

Should you use your stock market profits to prepay a home loan?

This article is the next part of our guide to purchasing your dream home. Read the other parts here:

Table of Contents


This article has been penned as a result of a reader question:

My MF has given some good returns. Shall I book some profits to make a prepayment of my home loan? Or Let the home loan run its course along with my investment for Goals. How to decide between prepayment of Home loan vs Investing in MF for goals? - Mr. K

This article introduces the concept of home loan prepayment and should be referred to before understanding this one.

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Strategies for prepaying: Steady prepayment

We will assume a ₹ 50 lakhs loan taken at 8% for 25 years. The EMI of this loan will be ₹ 37,671. We test the following strategies:

  • Case 1: Normal case: fixed EMI paid over 25 years
  • Case 2: One extra EMI paid at the end of every year
  • Case 3: EMI increased by 5% per year
(click to open in a new tab)
Using stock market profits to Prepay home loan
Cases Normal EMI One extra EMI yearly 5% increasing EMI yearly
Interest paid (lakhs) ₹ 63.0 ₹ 49.4 ₹ 35.8
Loan repaid in 300 months 244 months 164 months
Portfolio (lakhs) ₹ 1,089 ₹ 1,089 ₹ 1,088

We will consider these scenarios vs a SIP investment increasing at 5% per year in equity (11% return post-tax) and debt (3% return post-tax) mutual funds. The portfolio is rebalanced yearly to maintain a 60:40 allocation to equity and debt, respectively. This example alludes more to investors with a unified portfolio but is also applicable to more general cases.

We assume that the investor has ₹ 100,000 per month, of which ₹ 37,671 goes to the home loan, and whatever is remaining is invested. When the EMI increases or prepayment is done, a lesser amount is available for investing that month. However, once the loan is paid off, the entire amount is available for investing for a total of 25 years:

(click to open in a new tab)
Home loan repayment vs SIP

The portfolio row in the table above shows the value of investing after 25 years in all the cases. As you can see that the difference in the final portfolios is minuscule.

The difference between investing and prepayment is low since the loan rate is close to the portfolio’s blended return, the opportunity cost. This means that whenever prepayment is done, it happens in a portfolio whose target interest rate is very close to the home loan.

However, a closer look at the chart of loan balance vs portfolio growth shows a substantial difference in the prepayment cases when the loans are paid off earlier. This is because accelerated EMIs divert more money to the loan than investments. If you are investing for 25 years, it evens out. The cases are highlighted in red circles:

  • Case 2 vs Case 1: ₹ 620 lakhs vs ₹ 637 lakhs in 244 months
  • Case 3 vs Case 1: ₹ 238 lakhs vs ₹ 273 lakhs in 162 months

Hence, if you steadily prepay your home loan, you will not be worse off over a long time. As an added benefit, you can enjoy being debt-free earlier.

Strategies for prepaying: Lump sum prepayment

Consider that the investor has a lump sum amount either from a bonus at work or from another source. Even rebalancing from equity when equity markets have gone up significantly is another reason for this lump sum. This is to be evaluated in the context of the investor’s entire portfolio. The amount should go where it has the most chances of meeting future financial goals. The home loan should be considered as a debt investment which

  • has a lock-in (like PPF) up to the time the loan is fully paid off
  • has a reasonably high (compared to other debt instruments) and guaranteed interest rate (that will be slightly lower than the rate shown by the lender due to tax deduction on home loan interest)

Perform a recalculation of your entire portfolio using a comprehensive planner (like this) to see where this allocation should be made to debt or equity. If the allocation comes to debt, then prepay the loan with that amount. Keep in mind that unless you have a home loan like SBI Maxgain, the money you have invested into the loan cannot be brought out. It is generally a one-way transfer.

You should not prepay the home loan if your asset allocation does not allow it. For example, this may happen if the portfolio is already debt-heavy or the goals are such that the portfolio cannot be rebalanced further into debt.

Behavioural aspects of rebalancing vs the feeling of being debt-free

Once you recalculate your asset allocation, you need to decide how much rebalancing you wish to do. For example, some investors are concerned about tax implications when they sell. However, if the market moves suddenly, and falls are sharper and more sudden than rises, there will be many regrets. Ultimately you need to minimize your regrets by considering which of the following scenarios is most preferable (not most likely)

We will consider the following cases:

  • the market goes up after you rebalance from equity to debt
  • the market goes down, and you did not rebalance
  • the home loan rate falls after you prepay

You need to balance the regret in the cases above vs the feeling of being debt-free earlier.

Ideally, you should bring the equity to debt ratio to the exact value as required by your asset allocation. This is specifically true if you have a unified portfolio since the risk profile of such a portfolio is higher than non-unified portfolios. You should trigger rebalancing once it has gone beyond a corridor value of, say, 5%. So if your target allocation is 60:40, you should rebalance at 65:35 or 55:45.

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A worked out example

We will discuss this example from the holistic goal-based investing planner.

Calculation of SIP amount for multiple goals

The rebalancing from equity to debt and cash as shown to debt and cash buckets. The investment to the debt bucket can be invested in the home loan by prepaying.

The bank doesn’t want you to prepay

Any lender would wish for the loan to be serviced until the end of the tenure. This way, their income from interest payments on the loan continues predictably. To enforce this, many banks have a prepayment clause. If you close the loan before the tenure is up, you need to pay the penalty to the bank. You should check with both your home loan provider and RBI regulations to know what prepayment penalty, if any, applies to you.

If you are prepaying the loan, ensure that it is immediately applied to the principal amount and the duration comes down.

Reviewing your loan regularly

You should, as a part of your regular portfolio review, look at your home loan at least once in six months. You should check if

  • Can you lower the rate by switching to another lender?
  • Can you change to RLLR based loan vs base rate loans?
  • Can you change to a SBI Maxgain type loan which you can use to store a part of your emergency fund?

If you are getting a better rate elsewhere, consider switching costs and customer service of the new lender.

Please contact us using the links below to get a copy of the Excel sheet used to generate the numbers in the post (2021-09-28-equityprofitstoprepayloan.xlsx).

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