Deposits stop. Interest does not, until 21.
Sukanya Samriddhi: deposit for 15 years, account continues to year 21. Annual cap ₹1.5 lakh. Rate is a small-savings notification — type it. This is not PPF with a pink header; the tenor shape is different.
Worked example: ₹1.5 lakh × 15, then idle to 21
Contrib ₹22.5 lakh. Year-21 sketch includes six extra years of compound on a silent deposit. If the live rate is not what you typed, the poster number is fiction.
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