How the SSY estimate is calculated
The calculator adds monthly or yearly deposits during the first 15 years, estimates monthly eligible interest using one-twelfth of the annual rate, credits interest after each completed year, and then lets the accumulated balance grow without new deposits through year 21.
Deposit period
Contributions are modelled for 15 years, subject to the entered monthly or yearly amount.
Growth period
The balance continues to earn estimated interest until the 21-year maturity point.
Rate assumption
8.2% is held constant, although the government reviews small-savings rates quarterly.
Rate reviewed on 4 July 2026: 8.2% for July–September 2026. Actual maturity follows notified rates over the life of the account and may differ materially.