Sukanya Samriddhi Yojana (SSY) is one of the few savings schemes in India that pays close to 8% a year, tax-free, with a sovereign guarantee behind it. The catch is that it locks your money up for 21 years, so before you open an account for your daughter’s education or wedding fund, it’s worth running the actual numbers instead of trusting a round figure a bank relationship manager quoted you.
This guide walks through exactly how the SSY maturity amount is calculated, with three worked examples at different deposit levels, the partial-withdrawal math at age 18, and the mistakes that quietly cost parents real money over the scheme’s 21-year life.
How the SSY Maturity Formula Actually Works
SSY currently pays 8.2% per annum (FY 2025–26), reviewed every quarter by the government along with other small savings schemes. The rate is compounded annually—not on a flat average—which is what makes a simple “multiply by years” estimate wrong.
Here’s the part most online calculators skip explaining: you only deposit for 15 years from the date you open the account, but the account doesn’t mature until 21 years from that same opening date. For the final 6 years, you deposit nothing, but every rupee already in the account keeps earning 8.2% compounded annually. That gap is where a large share of the final corpus actually comes from.
So a deposit made in Year 1 compounds for the full 21 years. A deposit made in Year 15—your last one—only gets 7 years to grow. This is why depositing the full amount as early as possible in each financial year (ideally before the 5th of April, since SSY calculates interest on the lowest balance between the 5th and end of each month) measurably changes your final number, even if the total amount deposited across 15 years is identical.
Worked Example 1: ₹1,000 a Month (₹12,000/Year) From Birth
A parent opens an SSY account for a newborn daughter and deposits ₹12,000 every year for 15 years, then lets it sit for the remaining 6 years.
- Total invested over 15 years: ₹1,80,000
- Interest earned by maturity (Year 21): ₹3,94,570
- Maturity amount: ₹5,74,570
Interest alone contributes more than double the amount actually deposited—this is the compounding effect of letting the account run 6 years past the last deposit.
Worked Example 2: Maxing Out at ₹1,50,000/Year
A parent who wants to use the full annual limit (and the full Section 80C deduction) deposits ₹1,50,000 every year for 15 years.
- Total invested over 15 years: ₹22,50,000
- Interest earned by maturity: ₹49,32,119
- Maturity amount: ₹71,82,119
At the maximum deposit level, interest makes up roughly 69% of the final corpus—more than double what was actually paid in. This is also the scenario where starting even one financial year earlier makes the biggest rupee difference, since each early deposit compounds at the top of a much larger base.
Worked Example 3: Opening the Account Late (Daughter Already 8)
SSY allows accounts to be opened for a girl up to age 10, so a parent who missed the newborn window can still open one when their daughter is, say, 8 years old. They deposit ₹60,000/year for 15 years.
- Total invested over 15 years: ₹9,00,000
- Interest earned by maturity: ₹19,72,848
- Maturity amount: ₹28,72,848
The common mistake here is assuming the account matures on the girl’s 21st birthday. It doesn’t—maturity is always 21 years from the date the account was opened, not 21 years from the child’s date of birth. In this example, the daughter would be 29 years old when the account actually matures, not 21. If you’re opening the account later than infancy, factor that gap into your planning for when the money will actually be available.
Deposit Calendar: Where the 15-Year and 21-Year Numbers Diverge
| Period | What happens | Deposits required? |
|---|---|---|
| Year 1 – Year 15 | Minimum ₹250, maximum ₹1,50,000 deposited each financial year | Yes |
| Year 16 – Year 21 | No new deposits; existing balance continues compounding at the prevailing SSY rate | No |
| Year 21 | Account matures; full balance (principal + compounded interest) is paid out, tax-free | — |
Partial Withdrawal at 18: The 50% Rule, With Real Numbers
Once the girl turns 18 (or has passed Class 10, whichever is relevant to the purpose), the account holder can withdraw up to 50% of the balance as it stood at the end of the previous financial year, for higher-education expenses or marriage, against supporting documents like an admission letter or fee receipt. This isn’t 50% of the current balance at the moment of withdrawal—it’s locked to the prior year-end figure.
Using Example 1 above (₹12,000/year deposits from birth): by the end of the financial year before the daughter turns 18, the balance works out to roughly ₹4,19,212. That makes the maximum partial withdrawal available approximately ₹2,09,606—money that can go directly toward college admission or tuition without touching the rest of the account, which continues compounding toward the Year-21 maturity payout.
SSY vs PPF: Which Fits Your Goal?
Parents often compare SSY against the Public Provident Fund (PPF), since both are government-backed, EEE (tax-free investment, interest, and maturity) schemes with similar compounding mechanics. The core differences:
| Feature | Sukanya Samriddhi Yojana | PPF |
|---|---|---|
| Who can open it | Parent/guardian, for a girl child under 10 | Any resident Indian individual |
| Current interest rate | 8.2% p.a. | 7.1% p.a. |
| Deposit period | 15 years | 15 years (extendable in 5-year blocks) |
| Maturity | 21 years from account opening | 15 years (or longer if extended) |
| Annual limit | ₹250 – ₹1,50,000 | ₹500 – ₹1,50,000 |
| Best suited for | A dedicated daughter’s education/marriage corpus | General long-term, flexible-goal savings |
If you’re deciding between the two purely on return, SSY’s rate has consistently stayed ahead of PPF’s in recent years, but it comes with a hard eligibility condition (a daughter under 10) and a longer lock-in than PPF’s base 15-year term.
Mistakes That Quietly Cost You Money
- Missing the annual minimum deposit (₹250). The account isn’t closed, but it’s marked inactive and attracts a ₹50/year penalty to reactivate—avoidable by setting a standing instruction before each financial year-end.
- Depositing late in the month. Interest is calculated on the lowest balance between the 5th and the last day of the month. Depositing on the 10th instead of the 4th can cost you a full month of interest on that deposit, every single year, for 15 years.
- Opening more than the permitted number of accounts. A family can open SSY accounts for a maximum of two daughters (three only in the case of twins/triplets on the second birth). Extra accounts beyond this are not eligible for the scheme’s interest rate.
- Assuming you can keep depositing after Year 15. Deposits are only accepted for the first 15 years; the remaining 6 years are compounding-only, so there’s no way to add more principal late to catch up.
Run your own numbers using the Compound Interest Calculator—enter your planned annual deposit and compare it against the 8.2% SSY rate to see how your specific contribution schedule compounds over 15 and 21 years.
Who Should (and Shouldn’t) Open an SSY Account
SSY makes the most sense when three things are true at once: you have a daughter under 10, the money you’re setting aside is genuinely earmarked for her education or marriage rather than a goal you might need to redirect, and you’re comfortable not touching the bulk of that money for at least 15–21 years. The tax-free 8.2% is hard to match elsewhere in a government-guaranteed instrument, but that return comes bundled with one of the least flexible lock-ins among small savings schemes—full withdrawal before Year 21 is only permitted in narrow cases like the death of the account holder or a change in the girl’s residency/citizenship status.
If your goal is closer, more flexible, or unrelated to a daughter’s milestones, a PPF account, a recurring deposit, or an SIP in a mutual fund will usually fit better than forcing the goal into SSY just for the rate.
Frequently Asked Questions
Can I open an SSY account for a daughter older than 10?
No. The scheme requires the account to be opened before the girl turns 10. If she’s already past that age, SSY isn’t available, and PPF or a recurring deposit would be the closer alternative.
What happens if I stop depositing before 15 years are up?
As long as you’ve deposited at least the ₹250 minimum every year, the account stays active and simply matures on schedule at Year 21. If you miss a year’s minimum, the account goes inactive until you pay the shortfall plus the ₹50 penalty per missed year.
Is the SSY interest rate fixed for the full 21 years?
No. Like other small savings schemes, the rate is reviewed quarterly by the government and can move up or down. The 8.2% used in the examples above is the FY 2025–26 rate; your actual maturity amount will reflect whatever rate applies in each quarter over the account’s life.
Can both parents claim Section 80C deduction on the same SSY account?
The ₹1.5 lakh Section 80C deduction is a combined limit across all eligible instruments for the person who deposits the money, not a per-account or per-parent limit. Only the depositing parent can claim the deduction for that deposit.
Is SSY better than a Post Office or bank Fixed Deposit for a daughter’s future?
For a goal that’s specifically a daughter’s education or marriage and at least 15–21 years away, SSY’s tax-free 8.2% generally outperforms FD rates after accounting for tax on FD interest. For shorter or more flexible goals, an FD or RD offers liquidity SSY doesn’t.
Figures in this guide use the 8.2% FY 2025–26 SSY interest rate and standard annual-compounding methodology. Actual returns depend on the rate applicable in each quarter over your account’s 21-year life. This article is for educational purposes and isn’t financial advice—confirm current rates and rules on the India Post or your bank’s official SSY page before investing.