Once you've decided to build an emergency fund, the next question is where it should actually live — and the answer isn't "wherever earns the most." It's "wherever is safest and fastest to reach," because the entire job of this money is to be available the moment you need it, not to maximise a return.
Here's what qualifies: a regular savings account, or a liquid fund / sweep-in fixed deposit that auto-converts back to cash without penalty. What doesn't qualify: stocks, mutual funds with market risk, or a fixed deposit with a lock-in and early-withdrawal penalty. If reaching the money takes more than a day, or could cost you a meaningful penalty, it's not really emergency money — it's just savings that happens to be labelled that way.
Why this discipline matters: imagine the emergency itself is a medical bill or sudden job loss — already a stressful moment. The last thing you want is to also be selling investments at a bad time, or waiting three working days for a fixed deposit to break, or losing a chunk of the principal to an early-exit penalty. The fund should remove friction at exactly the moment you have the least patience for it.
A sweep-in deposit is often the sweet spot in India — it earns a bit more than a plain savings account while still converting to cash on demand. But if you're ever choosing between "earns slightly more" and "available instantly," for emergency money, always choose instantly. Boring and accessible isn't a compromise here — it's the actual feature.