FDs and RDs are often mentioned in the same breath as "safe savings options," but they solve different problems depending on whether you have a lump sum or a steady monthly income to set aside.
The core difference
A Fixed Deposit is for a lump sum you already have — you deposit it once and let it compound (usually quarterly) until maturity. A Recurring Deposit is built for people investing a fixed amount every month, effectively creating a savings discipline out of monthly income rather than requiring a lump sum upfront.
If you already have the money: FD usually wins
Since your entire amount starts earning interest immediately in an FD, while an RD's later monthly instalments have progressively less time to compound, an FD will produce a higher maturity value than an RD for the same total amount invested — this isn't a flaw in RD, it's simply a consequence of when the money is actually invested.
If you're building savings from monthly income: RD is the right tool
RD isn't meant to compete with FD on returns — it exists to build a habit of monthly saving without needing a lump sum to start with. For someone who doesn't have savings sitting idle but does have consistent monthly income, RD is often the practical starting point before eventually building toward a lump sum they could put into an FD.
Tax treatment is identical for both
Interest from both FD and RD is taxed at your income slab rate, and TDS applies once annual interest from a bank crosses ₹40,000 (₹50,000 for senior citizens) — this is one area where the two products don't differ, so tax shouldn't be a factor in choosing between them.
A sensible way many people actually use both
Start an RD to build monthly savings discipline, and once it matures (or once you have a windfall like a bonus), move that lump sum into an FD to continue earning on it — using each product for what it's actually designed to do, rather than treating them as interchangeable.