Sukanya Samriddhi Yojana Calculator: Save for Your Daughter

The account Lakshmi Narayanan opened for his daughter when she was eight will mature when she is twenty-nine. He did not know that. Nobody at the counter said it, and he had no reason to ask, because every explanation he had ever heard said the same six words: it matures when she turns twenty-one.

It does not. The scheme rules tie maturity to the account, not to the child. Twenty-one years from the date of opening. Open on her eighth birthday and the money is locked until she is twenty-nine — which is roughly a decade after the college fees he opened it to pay.

Lakshmi Narayanan is 41, a clerk at a mofussil bus depot in Madurai, and he is a composite — assembled from how late-opened accounts actually behave, not reported from one family. The daughter here is called Kavya. The arithmetic is real arithmetic.

Three clocks, all started on the same day

Most descriptions of this scheme give you one date and move on. There are actually three separate timers running, and the reason late openings go wrong is that they drift apart from each other.

The deposit window runs for fifteen years from the date of opening. After that you are neither required nor permitted to put money in. The maturity date is twenty-one years from the date of opening. And the access gate is tied to the girl herself: a partial withdrawal for higher education or marriage becomes available only once she has turned eighteen or has passed the tenth standard, and is capped at half the balance standing at the end of the preceding financial year.

Open the account in her first year and all three line up beautifully: deposits finish around the time she is sixteen, the withdrawal gate opens at eighteen exactly when admission fees land, and maturity arrives at twenty-one. Open it at eight, and the deposit window closes when she is twenty-three, the maturity date sits at twenty-nine, and the only money reachable for her degree is a partial withdrawal of half the balance.

The six years nobody budgets for

Here is the calculation that changes how the scheme should be read.

Deposit the annual maximum as it currently stands — ₹1.5 lakh, a figure fixed by notification and worth re-checking before you rely on it — at the start of each year for the full fifteen-year window, and compound at the rate prevailing when this was written. That rate is reset every quarter by the government, so treat it as an illustration of shape rather than a promise of size.

At the end of year fifteen, when the last deposit has been made and the account goes quiet, the balance is around ₹44.8 lakh against total deposits of ₹22.5 lakh. Then nothing happens for six years. No contributions, no decisions, no management. At maturity the balance is around ₹71.8 lakh.

The tail added roughly ₹27 lakh. Every rupee the family ever deposited across fifteen years of discipline came to ₹22.5 lakh. The six years in which they did nothing at all are worth more than the fifteen years in which they did everything.

That single fact reorders every decision about this account. The deposits are not the product. The tail is the product, and the deposits exist to give the tail something to work on.

What nobody tells you

Interest is computed on the lowest balance after the fifth of the month

The scheme rules state that interest for a calendar month is calculated on the lowest balance in the account between the close of the fifth day and the end of that month. A deposit made on the sixth does not count towards that month’s interest at all. It counts from the following month.

For a family paying in monthly instalments rather than one annual lump, that is not a rounding error. Run ₹12,500 a month for fifteen years with every deposit landing before the fifth, and compare it against the same money landing after the fifth. The on-time version finishes the deposit window around ₹30,000 ahead. Carry both through the six-year tail and the gap widens to roughly ₹48,000 — for nothing more than a standing instruction dated the third instead of the tenth.

A wedding can amputate the tail

The rules permit the account to be closed before completion of twenty-one years on the occasion of the girl’s marriage after she has turned eighteen, on an application made no earlier than one month before and no later than three months after the marriage date. That is a humane provision and families use it.

What is rarely stated is its price. Closing at year eighteen instead of twenty-one, on the illustration above, means roughly ₹56.7 lakh instead of ₹71.8 lakh — about ₹15 lakh forgone. Closing at year nineteen costs about ₹10.5 lakh. Those are the most expensive years in the account’s life, because compounding is back-loaded and the last years work on the largest balance the account will ever hold.

This is not an argument against closing it for a wedding. It is an argument for knowing the number in advance, because ₹15 lakh is a size at which a family might reasonably choose to fund the wedding another way and let the account run.

An account you stopped paying into is not a dead account

If the minimum annual deposit is missed, the account is treated as being in default and can be regularised by paying the arrears together with the prescribed penalty for each defaulted year, within the deposit window. What surprises people is the treatment of an account that is never regularised: under the 2019 scheme rules, such an account continues to earn interest at the rate applicable to the scheme until maturity. Older accounts operated under earlier rules that were less generous on this point, which is the source of a great deal of confusion at the counter.

The practical reading is that a lapsed account is usually worth leaving alone rather than closing in embarrassment. It is still compounding.

What to actually do

Open it as early as the rules allow, even with the minimum. The opening date sets all three clocks. A minimum-deposit account opened in her first year, topped up later when income improves, is structurally better placed than a maximum-deposit account opened at nine. You can always add money; you cannot move the maturity date backwards.

Date the standing instruction to the first or second of the month. Not the salary date, not a date you like. Before the fifth, with room for a bank holiday.

Deposit annually rather than monthly if you can. A lump sum placed at the start of the financial year earns for all twelve months. The same total drip-fed across the year earns on an average balance roughly half as large. If the household cannot carry a lump, save into a separate account through the year and transfer once.

Plan the college bill separately from this account. The withdrawal gate gives you at most half the previous year’s balance, once she is eighteen or has cleared the tenth standard. If the account was opened late, that half is being taken from a much smaller balance than the headline maturity figure suggests. Assume the account funds the later expense and something else funds the earlier one.

Check whose rules your account is under. Accounts opened before the 2019 rules came into force have been affected by successive amendments on defaults, guardianship and operation on attaining majority. If your account is old, ask the post office or bank in writing which version governs it.

What this does not mean

It does not mean late openings are pointless. An account opened at eight and left to run still produces a large, tax-exempt, sovereign-backed sum — it simply produces it at twenty-nine rather than twenty-one. If it is treated as the seed of her adult financial life rather than her college fund, the mismatch stops being a problem and becomes a feature.

It does not mean this should be the whole plan. It is a debt instrument with a fixed, quarterly-reset rate and a lock-in measured in decades. Over a horizon that long, an all-debt allocation carries its own risk, which is that the rate is revised downward across many of the remaining years while costs are not.

And it does not mean the numbers above will be the numbers you see. Every figure here rests on a rate that the government resets each quarter, applied unchanged across two decades, which will not happen. The purpose of the arithmetic is to show where the value sits in the timeline, and that conclusion holds at any plausible rate.

Frequently asked questions

Does the account mature when my daughter turns 21, or 21 years after opening?

Twenty-one years after opening. The two coincide only if the account was opened in her first year, which is why the common shorthand is misleading for anyone who opened later. If the account was opened when she was eight, maturity falls at her age twenty-nine, and the only earlier access is the partial withdrawal permitted once she has turned eighteen or passed the tenth standard.

Can I keep depositing until maturity?

No. Deposits are permitted only during the fifteen-year window from opening. After that the account continues to earn interest until maturity but accepts no further money. This is deliberate, and it is the mechanism that creates the six-year compounding tail that does so much of the work.

What happens if I miss the minimum deposit in a year?

The account goes into default and can be regularised by paying the missed minimum for each defaulted year along with the prescribed penalty, provided this is done within the deposit window. Under the 2019 rules, an account left in default still earns interest at the scheme rate through to maturity rather than dropping to a lower savings rate, so the cost of a lapse is the missed contribution and its compounding, not the destruction of the account.

Can the account be closed early for her education rather than her marriage?

Full closure on the grounds of education is not the mechanism; the mechanism for education is the partial withdrawal, capped at half the balance at the end of the preceding financial year, available once she has turned eighteen or passed the tenth standard, against documented admission or fee requirements. Premature closure entirely is permitted only in specific circumstances set out in the rules, including the death of the account holder and cases of extreme hardship certified by the competent authority, and on marriage after eighteen.

Regulatory source: the Sukanya Samriddhi Account Scheme, 2019, notified under the Government Savings Promotion Act, sets the fifteen-year deposit window, the twenty-one-year maturity from the date of opening, the calculation of interest on the lowest balance between the close of the fifth day and the end of the month, the partial withdrawal conditions and the closure provisions. Scheme rules and the current quarterly rate are published by the National Savings Institute; accounts are operated through India Post and authorised banks. The three-clocks framing, the tail-versus-deposits comparison, the deposit-timing arithmetic and the cost-of-early-closure figures are this article’s own.

---

Disclaimer: General information, not financial or tax advice. “Lakshmi Narayanan” and his daughter are composite characters, not real individuals. The interest rate is reset quarterly by the government and the figures above assume it unchanged for illustration only. Deposit limits, penalties and withdrawal rules change by notification — verify the current rules with your post office or bank before acting.