Fixed deposit or debt fund?

Much less clearly than before, and the honest answer is that the tax advantage has mostly gone. Until 31 March 2023, a debt fund held three years was taxed at 20% with indexation, which in a high-inflation period could reduce the effective rate to nearly nothing. That treatment ended.

Both are now taxed at your slab. What remains is deferral: the fund is not taxed until you sell, so it compounds gross. On ₹10 lakh at the same 7% both sides, that deferral is worth ₹6,065 over five years and ₹1.55 lakh over fifteen. Real, and a fraction of what indexation gave.

Debt mutual fund units bought on or after 1 April 2023 lost their long-term capital gains treatment entirely. There is no three-year qualifying period, no 20% rate and no indexation benefit: gains are added to income and taxed at the marginal slab rate whatever the holding period. Units bought before that date keep the old rules, so the purchase date of each unit matters, and a folio may hold both kinds.

Because tax paid this year cannot compound for you next year. A deposit hands over roughly a third of each year’s interest as it arises, so the balance grows at the after-tax rate for the whole term. A fund keeps everything working and settles at the end. Over three years the effect is negligible, around ₹210 on ₹10 lakh. Over fifteen it is ₹1.55 lakh. The longer the holding, the more it is worth, which reverses the usual intuition that short-term money belongs in funds.

They fail differently. A bank deposit is insured to ₹5 lakh per depositor per bank, and above that you are an unsecured creditor of one institution. A debt fund holds a portfolio, so no single failure wipes it out, but its value moves daily with interest rates and it can fall. Neither is the safer choice in the abstract: a deposit within the insurance limit is about as certain as anything gets, and a large amount in one bank is not.

The fund wins clearly. It can normally be redeemed in a day or two at whatever it is worth, with no penalty on most debt categories after any short exit-load period. Breaking a deposit generally means accepting the rate for the period actually held, less a penalty of around 0.5% to 1%. For money that might be needed at short notice that difference matters more than the tax treatment does.

More than people expect on a cumulative deposit. Interest is taxable as it accrues, so tax falls due each year on money you will not see until maturity, and it has to be funded from somewhere else. A five-year cumulative deposit produces four years of tax bills against no cash. The fund produces none until you redeem.

Arbitrage funds are taxed as equity, at 12.5% above the ₹1.25 lakh annual exemption on units held over twelve months, despite behaving much like short-term debt. That is a materially better tax outcome for a higher-rate taxpayer, and it comes with market risk that a deposit does not have. The post-tax yield calculator puts all of them side by side.

That depends on things this page cannot see: how long the money is genuinely committed for, how much is already at one bank, whether you could tolerate the balance falling, and whether you would need it at short notice. The arithmetic here narrows the question rather than answering it, and it mostly says that the tax argument which used to settle it no longer does.