A fixed deposit gives you a predictable interest rate. But after calculating tax, do you still get the same amount of money? When you choose where to park your money, the return you see upfront is only part of the picture. Among popular products like money market funds and fixed deposits, the return structures are different.
They even have different taxation norms, liquidity, and risk levels. The logical approach while choosing one of these products is to compare their post-tax returns. That’s what we have discussed in this blog.
How do FDs and money market funds work?
Through fixed deposits, you can invest a lump sum with a bank at a predetermined rate of interest for a chosen tenure. The interest you earn from FDs is taxable based on your respective income tax slab.
Money market funds are a category of mutual funds that invest in short-term money market instruments. These funds can fetch you market-linked returns, which means the value of your investment may fluctuate. A money market fund does not guarantee a fixed return for a specific tenure, which makes it different from an FD.
While you get greater predictability with an FD, money market funds provide you with market-linked exposure to short-term debt instruments.
Post-tax returns – Why the tax difference matters
Suppose you invest Rs 1 lakh in an FD that offers an annual interest rate of 7%. The interest after one year would be Rs 7,000 before tax.
You also invest in a money market fund that returns 7.5% annually. Your gains before tax grow to Rs 7,500.
Although both gains on money market funds and FD interest are taxed at your income slab rate, the tax treatment is different.
For FDs, the interest of Rs 7,000 is fully added to your income and taxed annually at your income slab rate, which may range from 5% to 30%.
For debt-oriented mutual funds, gains from units purchased after April 1, 2023 are classified as short-term capital gains. They are taxed at your applicable income tax slab rate, from 5% to 30%. Even if the pre-tax return and the final tax slab are identical, you are likely to retain more money with money market funds over a horizon longer than one year. The discrepancy is caused entirely by the timing of the tax deduction.
For FDs, the bank tracks interest on an accrual basis. Tax is calculated every single year, which reduces the principal amount left to compound for the next year. For money market funds, tax is triggered only when you redeem the mutual fund units.
Let’s assume that you invest Rs 10 lakh for 3 years in both an FD and a money market fund. Both earn similar pre-tax returns of 7%, and you come under the 30% tax slab. Cess is ignored to keep the calculation simple.
| Year | FD – Tax Paid Annually | MMF – Tax Deferred |
| Initial Investment | Rs 10,00,000 | Rs 10,00,000 |
| Year 1 | Rs 10,49,000 | Rs 10,70,000 |
| Year 2 | Rs 11,00,401 | Rs 11,44,900 |
| Year 3 | Rs 11,54,206 | Rs 12,25,043 |
| Total Profit | Rs 1,54,206 | Rs 2,25,043 |
| Tax Paid/Payable | Paid each year | Rs 67,513 at maturity |
| Final Net Value | Rs 11,54,206 | Rs 11,57,530 |
At the end of 3 years, you get approximately Rs 3,324 more after tax from the MMF because tax on its gains is deferred. That’s how the full pre-tax return is compounded for three years. You can also use a FIRE calculator when you’re planning for financial independence.
Which has better liquidity and risk – Money market funds or FDs?
Money market funds do not guarantee returns like FDs, and their NAV can move with market conditions. If you’re more conservative with your investment approach, FDs would offer greater certainty about the maturity value. The table below compares both these investment options in terms of liquidity and risk.
| Factor | Money market funds | FDs |
| Return | Market-linked | Predetermined |
| Capital value | Can fluctuate | Generally stable |
| Liquidity | Generally flexible, subject to terms of the fund | Premature withdrawal may involve conditions or penalty |
| Risk | Market and credit risk may apply | Depends on the institution taking deposits and applicable protection |
Conclusion
Money market funds and FDs serve different purposes, so you need to decide which one suits your portfolio and risk profile. If you prioritise predictable returns and a fixed maturity amount, an FD might be a simpler pick.
If you want exposure to short-term debt instruments and greater flexibility, money market funds may be relevant to you. However, they are suitable for investors ready to accept some market-linked fluctuation.
Before you invest, compare the post-tax return, liquidity, and risk instead of considering only the interest rate. The option that leaves you with a higher after-tax amount while matching your financial goal may be the more appropriate choice.