529 College Savings Plan

How 529 College Savings Growth Is Projected

A 529 plan is a tax-advantaged account for education savings: earnings grow federal tax-free, and withdrawals are tax-free too when used for qualified education expenses. Enter your current balance, planned monthly contribution, expected return, and time horizon to project your account balance at college start — along with the state income tax deduction many (not all) states offer on 529 contributions.

This calculator deliberately works forward from a contribution plan you already have, rather than backward from a target tuition cost the way the College Cost Calculator calculator does. That’s a genuinely different question: the College Cost Calculator answers “how much do I need to save each month to hit a projected future tuition price?”, while this one answers “given what I’m already contributing, what will I actually have, and what tax benefit comes with it?” The state tax deduction rate and annual limit are both plain, editable inputs rather than a fixed lookup table — 529 tax rules vary enormously by state, some states offer no deduction at all, and rules change over time, so a single hardcoded table would risk stating something false for your specific state.

Worked Example

A current balance of $10,000, contributing $200 per month, expecting a 6% annual return over 10 years, with no state tax deduction:

1. Future value of the current balance: $10,000 × (1.005)¹²⁰ ≈ $18,193.97.
2. Future value of the contributions: $200 × ((1.005)¹²⁰ − 1) / 0.005 ≈ $32,775.87.
3. Projected balance: $18,193.97 + $32,775.87 ≈ $50,969.84.
4. Total contributions: $10,000 + ($200 × 120) = $34,000. Tax-free growth: ≈$16,969.84.

Key Factors to Consider

• 529 funds aren’t limited to a four-year traditional college anymore. Federal rules have expanded qualified use to K-12 tuition (up to an annual limit), registered apprenticeship programs, and certain student loan repayment — check current federal and your own state’s rules before assuming a particular expense doesn’t qualify.
• A non-qualified withdrawal has real tax consequences. Withdrawing 529 earnings for something that isn’t a qualified education expense typically triggers federal income tax on the earnings portion plus a 10% penalty — the tax-free growth this calculator projects assumes the funds actually get used for qualified expenses.
• You aren’t required to use your own state’s 529 plan. Most states let you contribute to any state’s 529 plan, though the state tax deduction (where one exists) is often limited to contributions into your OWN state’s plan specifically — compare investment options and fees across plans, not just the tax benefit, before choosing one.
• Unused funds can often be redirected to another beneficiary. If the original beneficiary doesn’t use all the funds (a scholarship, a shorter program, choosing not to attend), many plans allow changing the beneficiary to a qualifying family member without losing the tax advantages.

Interpreting Your Results

The projected balance and tax-free growth figure are a planning estimate, not a locked-in outcome — a few things shift between this number and what actually lands in the account:

• Real 529 plans often offer an age-based investment option that shifts to more conservative allocations as college approaches, trading growth potential for stability in the final years before withdrawals begin. This calculator assumes one constant annual return across the entire time horizon, which can overstate growth in the last few years compared to a real age-based glide path — if your plan uses one, consider a somewhat lower blended rate for a more conservative estimate.
• The state tax deduction is a per-year estimate, not a one-time total. You (or whoever files taxes for the account) generally need to actually claim the deduction on that year’s state tax return, and if your state caps the annual deductible amount, contributing more than the cap in one year doesn’t automatically carry the excess deduction forward in every state — check whether your own state allows a carryforward.
• This projection assumes steady, uninterrupted monthly contributions at the same amount for the entire time horizon. A raise, a gap year of reduced contributions, or a lump-sum contribution (a grandparent’s gift, a bonus) will all shift the real trajectory — rerun the calculator whenever your actual contribution plan changes meaningfully.

Common Mistakes

• Assuming every state offers the same 529 tax benefit. Some states offer no deduction at all, some cap it well below your annual contribution, and some only apply it to contributions into that specific state’s own plan — check your state’s actual rules rather than assuming a deduction applies.
• Forgetting that growth compounds on the whole balance, not just new contributions. A meaningful current balance keeps growing on its own even before any new contribution is added, which is why starting early matters more than the exact monthly amount.
• Treating the projected balance as guaranteed. Investment returns vary year to year — this is a projection based on a constant assumed rate, not a promise of what the account will actually be worth.

Useful to Know

Since 2024, a federal rule change (the SECURE 2.0 Act) allows rolling over unused 529 funds directly into a Roth IRA for the account’s beneficiary, instead of only changing the beneficiary or taking a penalized non-qualified withdrawal. This option comes with real restrictions worth knowing before counting on it: the 529 account generally needs to have been open for at least 15 years, only contributions (and their earnings) made more than five years before the rollover qualify, the beneficiary needs earned income at least equal to the amount rolled over that year (the same requirement as any regular Roth IRA contribution), and the whole option is capped at a commonly-cited $35,000 lifetime limit per beneficiary. Confirm the current limit and rules with your plan provider or a tax professional before relying on this option — it’s federal law that could itself be adjusted, and plan administrators vary in how smoothly they support the rollover in practice.