529 College Savings Plan Calculator
Estimate how much your 529 college savings plan will grow based on annual contributions, investment return, and years until college.
How to use this tool
- Enter current 529 balance, annual contribution, years until college and expected annual return in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your projected 529 balance at college and the full breakdown beneath it.
⚠ This tool provides general estimates for education only and is not financial, tax or legal advice. Figures may not reflect your situation — verify with a qualified professional.
Formula
Future value of existing balance: FVbalance = B × (1 + r)n
Future value of annual contributions (ordinary annuity): FVcontributions = C × [(1 + r)n − 1] / r
Total: FV = FVbalance + FVcontributions
where C = annual contribution, r = annual return rate, n = years until college.
How it works
This calculator projects the future value of a 529 plan by compounding the existing balance forward at the expected annual return and adding the future value of annual contributions treated as an ordinary annuity (contributions made at year-end).
Qualified withdrawals from a 529 plan are federal income-tax-free when used for eligible education expenses. The tool does not model state tax deductions, contribution limits, or financial-aid impact. Returns are assumed constant and do not reflect actual market performance.
Worked example
$0 starting balance, $5,000/year, 18 years, 6% return
- n = 18 years, r = 6% = 0.06, C = $5,000, no existing balance.
- (1.06)^18: 1.06^10 = 1.79085, 1.06^8 = 1.59385; product = 2.85434.
- FV = 5,000 × (2.85434 − 1) / 0.06 = 5,000 × 1.85434 / 0.06 = 5,000 × 30.9057 ≈ $154,529.
- Total contributed = $5,000 × 18 = $90,000; growth = $154,529 − $90,000 = $64,529.
Projected 529 balance ≈ $154,525 with $64,525 in tax-free growth.
Common mistakes to avoid
- Assuming the projected balance will fully cover college costs without accounting for education inflation — tuition has historically risen at 4-6% per year, faster than general inflation; the contribution needed to cover future costs grows significantly over a 15-year horizon.
- Overlooking contribution gift-tax rules — individuals can contribute up to $18,000 per year (2024) or front-load up to 5 years ($90,000) without gift-tax implications; exceeding these limits without proper election has tax consequences.
- Forgetting that non-qualified withdrawals incur income tax plus a 10% penalty on earnings — projecting the full balance as spendable money without factoring in penalties for non-education use overstates available funds.
Key terms
- 529 Plan
- A tax-advantaged savings plan sponsored by states and educational institutions to encourage saving for future education costs.
- Qualified Expenses
- Education costs eligible for tax-free 529 withdrawals, including tuition, fees, books, room, and board at accredited institutions.
- Ordinary Annuity
- A series of equal payments made at the end of each period, used here to model annual 529 contributions.
- Tax-Free Growth
- Investment earnings inside a 529 plan are not subject to federal income tax, and withdrawals for qualified expenses are also tax-free.
Frequently asked questions
- Can I contribute to a 529 for a child who has not been born yet?
- Yes -- you can open a 529 and name yourself as beneficiary, then change the beneficiary to the child after birth. This lets you start the tax-advantaged growth clock early.
- What happens to leftover 529 funds if my child does not go to college?
- You can change the beneficiary to another qualifying family member, roll up to $35,000 (lifetime limit, after 2023 SECURE 2.0 changes) into a Roth IRA for the beneficiary, or withdraw the money subject to income tax plus the 10% earnings penalty.
- Does the calculator include state tax deductions on contributions?
- No -- the calculator models federal tax-free growth only. Many states allow a deduction or credit for contributions to their own 529 plan. Check your state's rules separately to quantify the additional benefit.