ReckonBoxHow the KVP calculator works
Kisan Vikas Patra is a one-time post office certificate built to double your money over a fixed term, currently 115 months at 7.5% a year. This calculator takes your deposit and the rate, then shows the maturity amount, the exact time to double, the total interest, and the year-by-year growth along the way. The maturity is always double the deposit, so the only real question is how long the doubling takes.
A Rs 1,00,000 certificate at 7.5% matures to Rs 2,00,000 in 115 months, earning Rs 1,00,000 of interest. That 115 months is 9 years and 7 months, a detail worth getting right, since several popular calculators print it as 9 years 5 months.
How long KVP takes to double
KVP doubles your money in 115 months at 7.5%, which is 9 years and 7 months. The doubling time comes from compound growth, not a fixed rule, so the formula is months = 12 times ln(2) divided by ln(1 plus the rate). Plug in 7.5% and you get 115.0 months, which is exactly the period the post office notifies.
Because the time is driven by the rate, a change to the rate moves it. At 8% the certificate would double in about 108 months, and at 7% in about 123 months, so the calculator recomputes the period whenever you change the rate. Your own certificate keeps the rate and the period fixed from the day you buy it, even if the government revises the rate for new buyers later.
The maturity formula
KVP maturity is exactly twice the amount you invest, because the scheme is designed to double the money over its term. So a Rs 5,00,000 certificate matures to Rs 10,00,000, and a Rs 10,00,000 certificate to Rs 20,00,000, with the interest earned equal to the sum you put in. There is no compounding toggle to fiddle with, no quarterly or monthly payout, just one deposit that comes back doubled at the end.
Under the hood the certificate does compound annually at 7.5%, and the calculator shows that path in the year-by-year table above. The value climbs from Rs 1,07,500 after year one to Rs 1,91,724 after year nine, then reaches the full Rs 2,00,000 at 115 months.
Can you take the money out after 2.5 years
KVP has a 30-month lock-in, so you cannot encash the certificate before 2 years and 6 months except on the death of the holder or a court order. After 30 months you can close it early, and the post office pays a prescribed amount from its own schedule. That amount is lower than the full doubled value and lower than the plain compound value for the time held, which is why the early-exit figures on various calculators disagree with each other.
The honest answer is that the exact premature amount depends on the fixed post office table for the month you encash, so this tool shows the certificate's accrued growth rather than guessing a precise early-exit payout. For the full doubling, the certificate has to run the complete 115 months.
Tax on KVP
KVP interest is fully taxable at your income tax slab as income from other sources, and the investment earns no Section 80C deduction. This sets it apart from NSC, whose deposit qualifies for 80C, and from PPF, whose interest is entirely tax-free. You declare the KVP interest when you file your return, and at a 30% slab the tax noticeably trims the headline doubling.
One practical use softens the lockup: a KVP certificate can be pledged as collateral for a loan, so the money is not entirely frozen for the near-decade it takes to mature. The NSC calculator covers the shorter 80C-eligible certificate, and the PPF calculator covers the long-term tax-free account.
KVP or NSC
Both are one-time post office certificates, but they pull in different directions.
| Feature | KVP | NSC |
|---|---|---|
| What it does | Doubles the money | Grows to about 1.44 times |
| Term | 115 months (9 yr 7 mo) | 5 years |
| Rate | 7.5%, compounded annually | 7.7%, compounded annually |
| 80C deduction | No | Yes, up to Rs 1.5 lakh |
| Interest tax | Taxable | Taxable |
KVP wins on the simple promise of doubling and a longer horizon, where NSC wins on the 80C tax break and a shorter 5-year term. For a plain one-time projection at any rate you choose, the lumpsum calculator runs the numbers without the scheme rules.
What this does not promise
The 7.5% rate is locked for the certificate you buy, so your doubling date is fixed the day you invest, but the rate on new certificates is reviewed every quarter and may differ later. The 115-month period, the lock-in and the tax treatment follow the current rules, and those rules change, so treat the figures here as a planning guide. KVP rules and rates are set by the government, and this is not investment or tax advice, so a qualified adviser can confirm how it fits your plans.
Frequently asked questions
What is a KVP calculator? A KVP calculator shows what a Kisan Vikas Patra deposit grows to, which is exactly double the amount you invest, and how long that takes at the current rate. At 7.5% a Rs 1,00,000 certificate matures to Rs 2,00,000 in 115 months, and the tool also shows the year-by-year growth along the way.
What is the current KVP interest rate? The Kisan Vikas Patra interest rate is 7.5% per annum, compounded annually, for the current quarter. The rate and the doubling period are locked in on the day you buy the certificate, so a later change to the rate for new buyers does not affect your certificate.
How long does KVP take to double the money? At 7.5% a KVP certificate doubles in 115 months, which is 9 years and 7 months, not 9 years 5 months as some sites state. The time comes from the compound-doubling formula, months = 12 times ln(2) divided by ln(1 plus the rate), so a higher rate doubles the money a little sooner.
How is KVP maturity calculated? KVP maturity is exactly twice the investment, since the scheme is built to double your money over its fixed term. So a Rs 5,00,000 certificate matures to Rs 10,00,000 and a Rs 10,00,000 certificate to Rs 20,00,000, with the interest earned equal to the amount you put in.
What is the minimum and maximum KVP investment? The minimum is Rs 1,000 and there is no maximum limit, with certificates sold in denominations of Rs 1,000, Rs 5,000, Rs 10,000 and Rs 50,000. A PAN is required for investments above Rs 50,000.
Can I withdraw KVP after 2.5 years? KVP has a 30-month lock-in, which is 2 years and 6 months, so premature encashment before then is allowed only on the death of the holder or a court order. After 30 months you can encash the certificate, and the post office pays a prescribed amount set by its own schedule, which is lower than the full doubled value.
Is KVP interest taxable and does it save tax under 80C? KVP interest is fully taxable at your income tax slab as income from other sources, and the investment does not qualify for any Section 80C deduction, unlike NSC or PPF. You declare the interest when you file your return.
Which is better, KVP or NSC? KVP doubles your money over 115 months but gives no tax benefit, while NSC grows to about 1.44 times over 5 years and its deposit qualifies for an 80C deduction of up to Rs 1.5 lakh. KVP suits a longer horizon with no tax planning, and NSC suits a shorter one where the 80C deduction matters.