SSY Calculator With Real Deposit Timing Engine

The Scheme Every Parent Knows, Calculated the Way It Actually Works

Sukanya Samriddhi Yojana is the scheme a parent of a daughter reaches for first, and with good reason. At 8.2 percent per annum it is the highest paying small savings product in India today, comfortably ahead of the Public Provident Fund at 7.1 percent. It carries the full backing of the Government of India, it is completely tax free at every stage, and it is built around a single clear goal: a corpus for your daughter education or her marriage. A parent in Pune, a grandparent in Kolkata, or a guardian in Ahmedabad can walk into a post office, open an account for a girl under 10, and begin building that corpus the same day.

What sets it apart from an ordinary savings product is the combination of who backs it and how it is taxed. The sovereign guarantee means there is no credit risk of the kind you accept with a corporate deposit, and the tax free status means every rupee of interest is yours to keep. For a goal as important and as non negotiable as a daughter education, that blend of safety and tax efficiency is precisely what most parents are looking for.

So why does this calculator exist when dozens already do? Because almost every one of them calculates the scheme wrongly. They take your annual deposit, apply 8.2 percent, compound it once a year, and show you a headline maturity value. That number quietly assumes you deposit the full amount at the perfect moment every single year.

Most parents do not. They deposit monthly, or they deposit whenever cash is free, often well after the start of the financial year. When they do, the real maturity value is lower than the headline, sometimes by a lakh or more, and no calculator warns them.

The reason is a rule buried in the Sukanya Samriddhi Account scheme. Interest is not calculated on your average balance or your closing balance. It is calculated on the lowest balance in the account between the close of the fifth day and the last day of each month. Deposit on or before the 5th and that money earns interest for the whole month.

Deposit on the 6th and it earns nothing for that month, no matter how large. Over a 21 year account, those missed months compound into a serious difference. This calculator is the only one that models that rule month by month, so the number you see is the number you will actually get.

The scheme itself is straightforward once the timing is understood. You open the account for a girl below 10 years of age, deposit for the first 15 years, and the account matures 21 years after opening. Crucially, the maturity is tied to the account, not the girl: an account opened when she is 3 matures when she is 24, not 21.

In the six years between the end of deposits and maturity, the balance keeps compounding at the notified rate without any further contribution from you. That silent growth phase is where a large part of the final corpus is built, and it is why starting early matters so much.

Sukanya Samriddhi enjoys the rare Exempt Exempt Exempt status. Your deposits qualify for a deduction under Section 80C of the Income Tax Act, which the new Income Tax Act 2025 renumbers as Section 123, up to the 1.5 lakh annual ceiling in the old regime. The interest credited each year is tax free. And the entire maturity amount is tax free in the hands of your daughter. Very few instruments in India offer all three, which is what places SSY at the top of the small savings table. Under the new Income Tax Act 2025, the familiar Section 80C becomes Section 123, but the deduction and the EEE treatment carry over unchanged, so nothing about the tax appeal of SSY shifts for a family that files under the old regime. You can confirm the current rate on the National Savings Institute website before you open the account.

How the 5 April Rule Quietly Shapes Your Corpus

To use this calculator well, you need to understand the one mechanic that separates the headline number from your real number. It is the monthly lowest balance rule, and once you see it in action the deposit pattern choice on this page stops being a technicality and becomes the most important decision you make.

Here is the rule in plain terms. For every calendar month, the scheme looks at the lowest balance in your account between the close of the 5th day and the last day of that month. Interest for the month is computed on that lowest figure. The twelve monthly interest amounts are added up and credited to your account once, at the end of the financial year, and from the next year they compound.

This is why a deposit made on 3 April is counted in April lowest balance and earns interest for all twelve months of the year, while the same deposit made on 12 April is not counted in April, so it earns interest for only eleven months that year.

One month of lost interest sounds trivial. It is not, because of compounding. That missed interest would itself have earned interest in year two, and that in year three, all the way to year 21. Run the two annual patterns in the calculator above and you will see the gap.

For a 1 lakh annual deposit at 8.2 percent, depositing before 5 April every year rather than after produces a maturity value roughly 30,000 rupees higher, entirely from timing. Scale that to the 1.5 lakh maximum and the gap widens further. Nothing about your saving discipline changed. Only the calendar did.

The monthly deposit pattern sits in between. Spreading your annual amount across twelve monthly instalments means most of the money is not in the account for the early months of the year, so it earns less than a single early lump sum. It still works, and for many families a monthly habit is the only realistic way to save, but you should know it costs something against the ideal.

The honest comparison table in the calculator shows all three side by side so you can decide with your eyes open rather than trusting a single optimistic figure.

The practical takeaway is simple. If you can manage a single annual deposit, make it in the first five days of April. If you save monthly, deposit on or before the 5th of each month so every instalment is counted in that month. Financial planners repeat this advice every April for exactly this reason, and the Reserve Bank of India notified small savings framework is what makes the timing matter. This calculator turns that advice from a vague nudge into a rupee figure you can see.

It helps to see why the effect grows rather than stays flat. In year one, a missed April costs you one month of interest on that year deposit, a small figure. But that uncollected interest never joins your balance, so in year two it is not there to earn its own interest, and in year three the shortfall from years one and two both fail to compound, and so on.

By year 21 the cumulative shortfall is many times the original single month you missed. This is the quiet arithmetic of compounding working against you, and it is exactly why a one time habit change, shifting your deposit to early April, pays off far more than its effort suggests.

Reference Rules and Limits for SSY in 2026

These figures reflect the Sukanya Samriddhi Account scheme rules and the Finance Ministry small savings notification for the July to September 2026 quarter. The rate is reviewed every quarter, so the figure that applies over your account life is the sequence of quarterly rates, not a single fixed number.

The calculator lets you model any rate so you can test a more conservative assumption.

A note on the rate history, because it matters for your planning. SSY launched in 2015 at 9.1 percent, briefly rose to 9.2 percent, then drifted down to a low of 7.6 percent during 2020 to 2023, before recovering to 8.2 percent from January 2024, where it has held ever since.

Over a 21 year account you will almost certainly see the rate move in both directions. Modelling a slightly lower average rate in the calculator gives you a more cautious and realistic maturity estimate than assuming 8.2 percent holds for two decades.

One myth worth clearing: the account does not mature when your daughter turns 21. It matures 21 years after the account was opened. Open it when she is 5 and it matures when she is 26.

Open it at birth and it matures when she is 21. This single point causes more confusion than any other, and getting it right is essential to planning around her education and marriage timelines.

It also helps to keep the two access points clearly separate in your mind. The first is the partial withdrawal at age 18, which lets you draw up to half the balance for education without disturbing the rest of the account. The second is full maturity at 21 years from opening, when the entire corpus is paid out.

Treating these as two distinct events, rather than assuming the money is locked solid until one final date, lets you fund an undergraduate course at 18 and still leave a substantial balance compounding toward her later goals.

Three Families and the Corpus They Build

Numbers land better when they belong to real families. Here are three, each in a different city, each with a different deposit amount and pattern. Every figure uses the current 8.2 percent rate and the same month by month engine this calculator runs.

Three families, three patterns, three very different journeys to a tax free corpus. Notice that the Patils, saving monthly, end up with less per rupee than a family depositing the same annual total early. That gap is invisible on every other calculator and visible on this one, which is the entire point.

There is a further lesson in the three families. The Reddys, at the full 1.5 lakh, show the ceiling of what the scheme can build. The Sharmas, at 50,000, show that even a mid sized commitment more than doubles into a tax free corpus. And the Patils, at 3,000 a month, show that the scheme rewards consistency even for a modest single income household.

Whatever your capacity, the combination of a high sovereign rate, full tax exemption, and a long compounding horizon does the heavy lifting, provided you feed the account early and never let it lapse.

Six Moves That Maximise Your SSY Corpus

SSY Numbers Worth Remembering

Frequently Asked Questions on SSY

SSY Versus PPF: Which Wins for a Daughter?

The question almost every parent asks is whether to use SSY or the Public Provident Fund for a daughter long term corpus. Both are government backed, both are EEE, and both draw on the same 1.5 lakh Section 80C ceiling in the old regime. The differences, though, are decisive once you line them up.

On rate, SSY wins clearly. It pays 8.2 percent against PPF 7.1 percent, and that 1.1 percentage point gap, compounded over two decades, translates into lakhs of extra corpus. On purpose, SSY is dedicated: it exists for a girl child education and marriage, with a lock in that enforces the discipline.

PPF is open to anyone and for any goal, which makes it more flexible but less focused. On tenure, SSY runs 21 years from opening with deposits in the first 15, while PPF matures in 15 years and can be extended in five year blocks indefinitely.

Where PPF pulls ahead is flexibility and access. PPF allows partial withdrawals from year seven and loans from year three, whereas SSY locks the money far more tightly, permitting only a single 50 percent withdrawal after the girl turns 18 and full access at maturity. A parent who values the higher rate and the enforced dedication to their daughter will lean SSY.

A parent who wants a general purpose tax free vehicle with easier mid term access will keep a PPF alongside. In practice, many families run both: SSY for the daughter specific goal and PPF for the household broader long term savings, using the 80C ceiling across the two.

One planning note. Because both share the 1.5 lakh 80C limit, filling SSY to its 1.5 lakh maximum leaves no 80C room for PPF or anything else in the old regime. If you want the deduction spread across instruments, split your annual 1.5 lakh between them.

If you are in the new regime, the 80C question is moot and you should simply chase the higher SSY rate for the girl child portion of your savings.

Withdrawal and Premature Closure Rules Explained

SSY is deliberately restrictive, because the whole point is to protect a long term corpus from being spent early. Still, the scheme allows access in a few defined situations, and knowing them precisely helps you plan around your daughter milestones rather than being caught out.

The main mid term access is the partial withdrawal at age 18. Once your daughter turns 18, or passes her Class 10 examination, whichever is earlier, you may withdraw up to 50 percent of the balance as at the end of the previous financial year. This is meant for her higher education, and in practice for her marriage too.

Because the 50 percent cap is set on the prior year end balance, timing a withdrawal application just after 31 March lets you draw on the largest possible base. Only one such partial withdrawal is generally permitted, so plan it around the actual fee requirement.

Full premature closure, before the 21 year maturity, is allowed only in specific circumstances. The girl marriage after she turns 18 permits closure, with the application made between one month before and three months after the marriage, supported by age proof. The death of the girl closes the account and the balance with interest is paid to the guardian.

Closure is also allowed on extreme compassionate grounds, such as a life threatening illness of the account holder or the death of the guardian who operated the account, subject to the required authorisation. General financial need, however pressing, is not a permitted ground.

If you close the account for a reason outside these permitted grounds, the account earns interest only at the ordinary post office savings account rate, which is far below the SSY rate, for the period concerned. That penalty is deliberately steep to discourage casual early exit. At the true maturity, 21 years after opening, the full balance including all accrued interest is paid to your daughter and is completely tax free.

If you leave the money in after maturity, it earns no further interest, so schedule the maturity withdrawal promptly once the account completes 21 years.

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