Calculation method
The model calculates the statutory growth-period end from the birth date: December 31 of the calendar year in which the child turns 17. It applies a monthly equivalent of the selected annual return, subtracts monthly equivalents of the fund-expense and account-fee assumptions, deposits monthly family contributions at month-end, and deposits annual family and employer contributions at December 31.
The “fee impact” compares the same cash flows with and without both fee assumptions. The 0.10% ceiling applies to the eligible investment fund; separate trustee or intermediary fees require their own analysis. Partial months, taxes, inflation, tracking error, market sequence, actual deposit timing, and withdrawals are not modeled.