MoneyMeticStart with the money you can really commit
A bonus or accumulated surplus can create a tempting choice: reduce the loan or invest for growth. First check that it is truly surplus. Upcoming taxes, annual premiums, urgent repairs and the emergency reserve already have a claim on some of that balance. Money that may be needed soon should not quietly become a long-term commitment.
Check all expensive debts rather than looking only at the largest loan. The SEC’s investor-education guidance on high-interest debt explains why expensive revolving balances deserve attention before taking additional investment risk. A large home loan is not necessarily the most urgent balance.
Measure the interest you would actually avoid
A prepayment reduces future interest by reducing principal earlier. The saving depends on the outstanding balance, remaining time, rate and exact prepayment date. It is not simply the prepaid amount multiplied by the original loan rate and original tenure. Interest that has already been paid is a past cost and cannot be recovered by today’s decision.
Enter your current loan position, add the proposed one-time or recurring extra payment and compare the remaining schedules. Ask the lender whether the default is a lower EMI or shorter tenure. If you keep paying the old EMI, a different amount of principal may be retired than under a reduced-payment arrangement.
Put investment expectations on a comparable basis
Compare money over the same time period and in the same currency. Investment returns may be reduced by fund expenses, transaction costs and taxes. A quoted long-term average is not a guaranteed return available over your remaining loan term. A risky investment can also lose value when you need to use it.
For a simple one-year illustration, avoiding ₹10,000 of otherwise payable interest on ₹1,00,000 is different from hoping to earn ₹10,000 on an investment. The first figure still depends on actual loan terms and charges, while the second is uncertain. Do not turn an expected return into a certainty just because a calculator displays one number.
Count flexibility as part of the decision
Once you prepay, you may not be able to withdraw the money again. An offset, redraw or similar feature changes that analysis only if your product actually offers it on usable terms. Otherwise, a larger emergency might require a new, more expensive loan even after a sensible-looking prepayment.
Write down the smallest accessible balance you want to preserve. Then test three options: prepay the available surplus, invest it or split it. Splitting is not automatically optimal, but it can make the trade-off visible when you value both lower debt and continued access to money.
Check charges and tax treatment without guessing
Ask for the current prepayment conditions for your exact loan, including minimum amounts, timing restrictions and fees. Do not assume that every fixed or floating loan has the same treatment. If a tax deduction affects the comparison, use the benefit you can actually claim under your circumstances rather than a theoretical maximum.
A useful comparison includes the prepayment charge today, future interest avoided and the investment outcomes you are willing to test. Keep tax assumptions explicit. If the answer changes under a modest change in returns, charges or tax treatment, the decision is sensitive and deserves a wider safety margin.
Choose a policy you can repeat
Instead of reconsidering the whole question after every bonus, write a simple rule linked to your circumstances. For example, first refill the chosen cash buffer, then reassess the loan against your next goal. This is an illustration of a process, not a universal allocation recommendation.
Save the original loan scenario and the prepayment scenario in MoneyMetic. Record why you chose the amount, what cash remains and when you will review it. A good decision is one whose assumptions you can explain later, even if markets or interest rates move in a different direction.
Model a prepayment
Use your own inputs, save a baseline and compare what changes.
Open calculatorSources & further reading
Sources checked 7 Nov 2026. Examples and planning frameworks are MoneyMetic illustrations. Rates and return assumptions are hypothetical unless stated otherwise. This article provides general education, not personalised financial, investment or tax advice.