College Savings (529 Plan) Calculator
Estimate how much you need to save each month in a 529 plan to cover projected college costs, accounting for tuition inflation and investment growth.
Formulas Used
1. Projected Future Annual Cost (Year 1 of College):
FutureCost = CurrentAnnualCost × (1 + g)n
Where g = annual tuition inflation rate, n = years until college.
2. Total Amount Needed at College Start (PV of all college years):
TotalNeeded = FutureCost × Σk=0 to Y-1 [(1+g)/(1+r)]k × CoverageFraction
Where Y = years of college, r = annual investment return. This discounts each year's cost back to the college start date.
3. Future Value of Existing Savings:
FVexisting = CurrentBalance × (1 + r)n
4. Required Monthly Contribution (Future Value of Annuity):
PMT = RemainingNeeded × rm / [(1 + rm)N − 1]
Where rm = monthly return (annual ÷ 12), N = total months of saving.
Assumptions & References
- Contributions are made at the end of each month (ordinary annuity).
- Investment returns are compounded monthly.
- Tuition inflation is applied annually to project future costs.
- The total college cost is discounted back to the enrollment date using the investment return rate to determine how much must be in the account at that time.
- Historical average tuition inflation has been approximately 4–6% per year (College Board, Trends in College Pricing).
- A diversified 529 portfolio has historically returned 5–7% annually over long horizons (Vanguard, Fidelity fund data).
- 529 plan contributions are not federally tax-deductible, but earnings grow tax-free when used for qualified education expenses (IRS Publication 970).
- Many states offer a state income tax deduction for 529 contributions — check your state's plan for details.
- This calculator does not account for financial aid, scholarships, or room and board unless included in the annual cost input.
- Results are estimates only and do not constitute financial advice. Consult a financial advisor for personalized planning.