529 Plan Growth Calculator
Growth That Isn't Taxed Away
A 529 plan uses the same compound growth math as any other investment account, with one important difference: earnings grow tax-deferred, and withdrawals are entirely tax-free when spent on qualified education expenses. That distinction means the full projected growth shown here — not a reduced after-tax figure — is what a family can realistically expect to have available. This calculator projects account value from an initial deposit, ongoing monthly contributions, and an expected rate of return.
The Formula
P is the initial deposit, PMT is the monthly contribution, r is the monthly rate (annual return divided by 12), and n is the number of months until funds are needed. Because 529 earnings aren't taxed annually the way a standard brokerage account's might be, this projection represents the full pre-tax growth amount with no separate tax adjustment applied.
A Worked Example
| Component | Value |
|---|---|
| Total Contributed ($2,500 + $150 × 180 months) | $29,500.00 |
| Total Tax-Advantaged Growth | $25,166.71 |
| Projected Balance | $54,666.71 |
Over 15 years, tax-advantaged growth very nearly matches the total amount contributed.
Where This Calculation Matters
- New account planning — deciding an initial deposit and monthly contribution amount that realistically reaches a target balance by enrollment.
- Comparing time horizons — a 529 opened at birth versus one opened when a child starts middle school produces dramatically different projected balances at the same contribution level.
- State tax deduction planning — many states offer a deduction for 529 contributions, making the account attractive even before investment growth is considered.
- Multiple-child planning — running the numbers separately for each child's account and timeline.
How to Use This Calculator
- Enter the Initial Deposit already in the account.
- Enter the planned Monthly Contribution.
- Enter the Expected Annual Return as a percentage.
- Enter the Years Until College funds will be needed.
- Select Calculate to see the projected balance, total contributed, and tax-advantaged growth.
Related Calculations
Compare against a standard taxable savings approach with the College Savings Calculator, or see what that balance needs to cover with the Tuition Cost Calculator.