SWP vs. Bank Account: Which One Should Fund Your EMI?

Say you're buying a property and setting aside a lump sum specifically to cover your EMI for the first several years, rather than paying it entirely out of salary. Where should that money sit? The two obvious choices (a mutual fund SWP or a bank account) get taxed completely differently, carry different risk, and behave differently under exactly the kind of pressure this money is designed for: reliably producing a fixed monthly amount, on schedule, for years.

How is each one taxed?

This is where most comparisons stop too early, so let's be specific.

Bank account interest

Every rupee of interest a bank credits you is treated as "Income from Other Sources" and taxed at your full marginal income tax slab: for many salaried professionals, that's 30% plus cess. This happens every year the interest is earned, in full, regardless of whether you withdraw it. There's essentially no favourable treatment: a ₹10,000 interest credit at a 30% slab leaves you with about ₹6,900 after tax.

SWP (mutual fund) withdrawals

An SWP withdrawal is really a partial sale of your fund units. Only the profit embedded in that sale is taxable: the portion representing your original invested capital isn't taxed at all, since it's simply your own money coming back to you. And the tax rate on that profit portion is lower too: for equity funds held over a year, long-term capital gains are taxed at 12.5%, with an annual exemption on the first ₹1,25,000 of gains in a financial year (effective 23 July 2024, per the Finance (No. 2) Act, 2024), versus a ~30%+ slab rate on bank interest. The exact month-by-month gain fraction calculation and tax gross-up are on the methodology page.

So SWP always wins? Not quite.

The tax edge is real, but it only tells half the story. The other half is what the money is for. This corpus has one job: reliably cover a fixed monthly obligation for a defined number of years. That's a job about certainty, not about maximising return, and that changes the calculus.

The risk a bank account doesn't have

A bank account's return is contractual and guaranteed (within the deposit insurance limit, more on that below). An SWP's return depends entirely on the market. First, notice how short the runway already is even under a calm, steady 7.5%: the ₹40,00,000 corpus above, funding an ₹80,559 EMI, runs out at month 58, not even 5 years into a 20-year loan, because withdrawing roughly 24% of the corpus a year comfortably outpaces 7.5% growth. Now drop that return to a flat 1%, a stand-in for a genuinely bad multi-year stretch, and the same corpus depletes at month 51, seven months sooner. That's the whole mechanism: you're withdrawing a fixed amount every month regardless of what the market is doing, so a weak early stretch doesn't average out later, it just shortens the runway before it's had a chance to compound anything back. This is called sequence-of-returns risk, and it disproportionately hurts a shrinking, actively-drawn-down corpus rather than a growing, untouched one.

In other words: the same volatility that's a non-issue for a 20-year SIP you never touch becomes a real threat for what is, on these numbers, a roughly 4-to-5-year SWP. This isn't a flaw specific to this example either: the calculator's own Balanced strategy deliberately sizes its corpus for a 36-48 month runway rather than the full loan tenure, for exactly this reason, funding the early years while the EMI is largest and letting salary growth take over from there.

The nuance that changes everything: what's inside the SWP

If the SWP corpus sits in an equity fund, you get the full tax advantage described above, but you're carrying real market risk on money with a fixed, near-term job. If it sits in a debt fund, the picture changes again: the Finance Act, 2023 removed the long-term capital gains benefit on debt mutual funds bought on or after 1 April 2023, so gains on those units are now taxed at your full slab rate, the same as a bank account, regardless of holding period. That means a debt-fund SWP built on post-April-2023 units has lost its tax edge over a savings account entirely, while still carrying some interest-rate and credit risk that a savings account doesn't. Units bought before that date keep the older, more favourable treatment, so the cutoff matters if you're holding an existing debt fund rather than starting one now.

A quick side-by-side

What does this mean for the decision?

Because this corpus exists to fund a fixed near-term obligation rather than to grow, the honest framing is: certainty is doing more work here than tax efficiency. A high-interest savings account trades away the SWP's tax edge in exchange for zero market risk, instant liquidity, and no redemption lag before an EMI due date. An equity SWP offers better after-tax efficiency and probably a higher expected return, but asks you to accept that a bad few years early on could shorten the runway this money was supposed to provide.