The headline numbers aren't the real comparison
PPF's current rate and a typical bank FD rate are often within a percentage point or two of each other, which makes it tempting to treat this as a simple "which rate is higher" question. It isn't. The two products differ far more on tax treatment, liquidity, and contribution limits than they do on rate, and those differences usually matter more to the actual outcome than a percentage point of return.
Comparing them on rate alone is like comparing two job offers only on salary while ignoring hours, location, and growth path — technically an input, but not the one that decides which is actually better for your situation.
Tax treatment: PPF's genuine structural advantage
PPF carries EEE (Exempt-Exempt-Exempt) status: your contribution is deductible under 80C, the interest earned is tax-free, and the maturity amount is tax-free. FD interest, by contrast, is fully taxable at your income slab rate, with TDS deducted by the bank above a threshold.
This gap widens the higher your tax slab. At a 30% slab rate, an FD paying 7% is really delivering a post-tax return closer to 4.9%. PPF's equivalent rate, being fully tax-free, doesn't need this adjustment at all — a PPF rate of 7.1% and an FD rate of 7.1% are not equivalent once tax is applied, even though they look identical on paper.
Liquidity: FD's genuine structural advantage
This is where FD wins decisively. An FD can be broken at almost any time, usually at the cost of a reduced interest rate or a small penalty, giving you access to your money within days if genuinely needed. PPF, by contrast, locks your money for 15 years, with only limited partial withdrawal allowed from year 7 onward under specific conditions — not a general-purpose liquidity option.
This makes PPF fundamentally unsuitable for money you might need on short or even medium notice, regardless of how attractive its tax-free return looks. An emergency fund, a home down payment you're saving for in the next 3–5 years, or any goal with real timeline uncertainty belongs in something FD-like, not PPF.
Contribution limits: PPF caps how much of this game you can play
PPF caps annual contributions at ₹1,50,000 per account, per financial year. An FD has no such ceiling — you can deposit any amount your bank accepts. This means PPF's tax-free advantage is capped in absolute terms; beyond ₹1.5 lakh a year, any additional savings you want in a safe, fixed-income instrument has to go into FD (or another option), not PPF, simply because PPF won't accept more.
For someone with substantial savings capacity, this makes the PPF-vs-FD question less "either/or" and more "how much goes into each" — PPF up to its ceiling for the tax-free portion, FD (or another instrument) for anything beyond that.
A worked comparison over 15 years
Take ₹1,50,000 invested annually for 15 years in both. PPF at 7.1%, fully tax-free, grows to roughly ₹40.7 lakh, and that entire amount is yours. An FD at a similar 7.1% rate, held by someone in the 30% tax bracket, effectively earns closer to 5% post-tax after annual tax deduction on interest — compounding at that lower effective rate over 15 years produces a meaningfully smaller final corpus, potentially several lakh rupees less than the PPF outcome, purely from the tax drag compounding year after year.
This gap is the concrete version of the abstract point above: for money you can genuinely lock away for 15 years, PPF's tax-free compounding usually outperforms an equivalent-rate FD once tax is accounted for, sometimes by a significant margin over a long-enough horizon.
Which situations favour each
PPF makes sense when: you have a genuinely long time horizon (10+ years), you're already using or planning to use your 80C limit, and the money isn't earmarked for a near-term need.
FD makes sense when: you need liquidity or a shorter, flexible tenure, you've already maxed out PPF's annual ceiling, you're in a lower tax bracket where the tax-drag disadvantage matters less, or you want to ladder deposits across different maturity dates for planned upcoming expenses.
Both together makes sense for most people: PPF for the long-term, tax-advantaged, "don't touch this" portion of savings, and FD for the shorter-term, flexible, might-need-this-sooner portion — treating them as complementary rather than competing.