529 plan growth calculator

How 529 plans actually grow over 18 years

A 529 plan is a state-sponsored, tax-advantaged investment account for education expenses. Contributions grow tax-deferred, and withdrawals for qualified education expenses (tuition, fees, room/board, books, technology, up to $10K/year of K-12 tuition, and student loan repayment up to a lifetime $10K) are federally tax-free. 34 states also offer a state income-tax deduction or credit on contributions.

Starting at birth with $300/month and 7% average annual return (age-based portfolio, moderate risk):

• Year 5: ~$21,000 balance (contributions: $18,000).
• Year 10: ~$52,000 (contributions: $36,000).
• Year 15: ~$95,000 (contributions: $54,000).
• Year 18: ~$130,000 (contributions: $64,800).

Half the final balance is compound growth that would have been taxed at 15–23% (long-term capital gains) in a taxable account. The effective tax savings over 18 years: ~$18,000–$25,000 at moderate contribution levels.

Picking the right plan — state tax vs. low fees

Every state except Wyoming sponsors at least one 529 plan. You can invest in any state’s plan, but most state tax deductions only apply if you use your home state’s plan. The sweet spots:

• In-state plan if your state offers a tax deduction/credit worth more than fee savings from an out-of-state plan. Illinois, New York, and Pennsylvania have especially generous deductions.
• Out-of-state plan (Utah, Nevada, New York’s Direct) if your state offers no tax break. These have the lowest expense ratios in the industry (0.05–0.15%).
• Avoid broker-sold plans like the plague. Expense ratios on broker-sold plans average 1.2–1.5%; direct-sold plans average 0.3%. Over 18 years, 1% in fees eats roughly 18% of the final balance.

The gifting and estate-tax angle

Grandparents and other family members can accelerate contributions using a special 529 provision: you can front-load 5 years of annual gift-tax exclusion ($18,000/year in 2025) into a single $90,000 contribution per beneficiary without triggering gift tax. For a married couple: $180,000 per grandchild. This is a common estate-planning tool among high-net-worth families.

What 529s pay for — and what they don’t

Qualified expenses:tuition, mandatory fees, room/board (up to school’s cost of attendance figure), books, supplies, computers/printers, internet service, special-needs equipment. K-12 private school tuition up to $10K/year. Registered apprenticeship costs. Student loan principal/interest up to $10K lifetime per beneficiary.

Not qualified (penalty + tax on earnings):transportation, cell phones, sports/club fees (unless required), health insurance, gym memberships, off-campus rent above the school’s published room/board figure.

The FAFSA impact

529 accounts owned by the parent count as parent assets on FAFSA, assessed at 5.64%. A $100K 529 balance increases SAI by roughly $5,500 — modest. Grandparent-owned 529s used to count as student income (brutal), but the 2024 FAFSA overhaul removed this — grandparent 529 distributions are no longer reported on FAFSA at all, making them a powerful way to supplement need-based aid.

When NOT to use a 529

• You qualify for major need-based aid anyway — Pell Grant + institutional aid can sometimes cover 80%+ of cost without savings.
• Your retirement is underfunded. Retirement accounts are prioritized; there’s no scholarship for retirement.
• You’re certain the beneficiary won’t pursue higher education. SECURE 2.0 Roth rollover helps but the balance can still end up in the wrong place.

State-by-state tax benefit cheat sheet

The value of the in-state tax deduction varies dramatically. A few meaningful examples at 2025 rates:

• Illinois: $10K single / $20K joint deduction against 4.95% state tax = up to $990 in state tax savings per year. Plan: Bright Start (0.07% expense ratio, T. Rowe Price).
• New York: $5K single / $10K joint deduction against up to 6.85% state tax = up to $685 per year. Plan: NY 529 Direct (Vanguard, 0.12%).
• Indiana: 20% tax credit on contributions up to $7,500 = up to $1,500 back per year. CollegeChoice Direct. Credit, not deduction — beats most states on the math.
• Utah: 4.55% credit on up to $2,580 per beneficiary per taxpayer = $117 per beneficiary. Small deduction, but the my529 plan has among the lowest fees nationwide.
• Pennsylvania: $18K single / $36K joint and you can use ANY state’s 529 and still take the PA deduction. Rare flexibility.
• California, Massachusetts, New Jersey, Hawaii: No state tax deduction. Use Utah, Nevada (Vanguard), or New York Direct for low expense ratios.
• Texas, Florida, Tennessee, Washington: No state income tax, so no deduction benefit. Optimize purely on fees and investment options.

Three worked 18-year scenarios

Scenario A — modest starter, age-based portfolio: $200/month from birth, 6% net return after fees. Year 18: ~$78,000 balance from $43,200 contributed. Covers 4 years of in-state public tuition + some room and board at a Big 10 flagship.

Scenario B — late start, aggressive catch-up: Parent starts when child turns 10 with $500/month, plus a one-time $20,000 grandparent contribution at year 10. 7% return. By age 18: ~$95,000. Enough for in-state public or a big chunk of a private if paired with need aid.

Scenario C — lump-sum super-funded at birth: Grandparents front-load $90,000 per grandparent ($180K couple) using the 5-year gift-tax election when the child is born. 7% return, no further contributions. Year 18: ~$608,000. Enough for Ivy-level sticker plus grad school, with Roth IRA rollover capacity for leftover funds.

Investment options inside a 529

Most state plans offer three main categories:

• Age-based / enrollment-year portfolios: Automatically shift from 90% stock when the child is 3 to ~20% stock by age 18. Default choice for most parents. 529 plans call these “Enrollment Year” portfolios after 2020 regulations renamed them.
• Static risk-based: Choose an aggressive, moderate, or conservative mix and stay there. Useful if you want to override the default glidepath (e.g., keep more in stocks past age 15 if you have other funds).
• Individual funds: Index funds, TIPS, REITs. Good for sophisticated investors; you can only rebalance twice per calendar year per IRS rules.

Withdrawal mechanics (don’t get this wrong in April)

Qualified withdrawals are tax-free only if the distribution occurs in the same calendar year as the qualified expense. Classic trap: student pays January tuition out of pocket in December, then requests the 529 withdrawal in January — the withdrawal no longer matches a current-year expense. Always pair year-of-expense with year-of-withdrawal. Keep receipts for 3 years minimum (IRS audit window).

Non-qualified withdrawals trigger ordinary income tax on the earnings portion plus a 10% federal penalty. Scholarship exception: if your child receives a scholarship, you can withdraw up to the scholarship amount penalty-free (you still pay income tax on earnings). This is how many upper-middle-income families recapture over-funded 529 dollars.

Roth IRA rollover mechanics (SECURE 2.0 specifics)

Starting 2024, unused 529 funds can be rolled into a Roth IRA for the same beneficiary. Conditions:

• The 529 account must have been open at least 15 years.
• Contributions (and earnings on those contributions) from the last 5 years are not eligible.
• Lifetime rollover limit: $35,000 per beneficiary.
• Annual limit: the standard Roth IRA contribution limit ($7,000 in 2025 for under-50).
• The beneficiary must have earned income at least equal to the rollover amount in the rollover year.

Practical implication: a family with $50,000 left over after graduation can roll $35,000 into the new grad’s Roth IRA over five years (2025 = $7K, 2026 = $7K, etc.), giving them a massive retirement-savings head start. The remaining $15,000 can cover grad school, be transferred to a sibling, or be withdrawn with the 10% penalty if no better option.

Common questions

Can I have multiple 529 accounts for one child? Yes. Parents and grandparents can each hold separate 529s for the same beneficiary. This is often advantageous for FAFSA (grandparent 529 no longer counted) and for state tax deductions (multiple family members can each deduct in their own states).

Can I change the beneficiary?Yes — to any “member of the family” including siblings, stepsiblings, first cousins, nieces, nephews, and the beneficiary’s spouse. No tax consequence. Common tactic when one child doesn’t attend college.

What happens if my child gets a full scholarship? You can withdraw up to the scholarship amount penalty-free (earnings still taxed). Or leave the funds in the account for grad school, transfer to a sibling, or roll to Roth under SECURE 2.0.

Can 529 funds pay for study abroad?Yes, if the foreign school is on the Department of Education’s list of eligible institutions (most accredited international universities are). Check the FAFSA school code database first.

Does a 529 hurt financial aid?Parent-owned 529s count as parent assets at 5.64% on FAFSA — a $50K balance increases SAI by ~$2,820. Minor impact. Grandparent-owned 529 distributions don’t count at all on FAFSA post-2024.

Can I use 529 for a coding bootcamp?Only if the bootcamp is registered as an eligible educational institution with the Department of Education (some are — Galvanize, Flatiron, certain university-affiliated bootcamps). Check the school’s FAFSA code before assuming.

What if my child doesn’t go to college? Options, in order of attractiveness: (1) change beneficiary to a sibling/relative; (2) hold until they change their mind; (3) use for trade/technical school (many are 529-eligible); (4) Roth rollover (up to $35K lifetime); (5) non-qualified withdrawal with 10% penalty on earnings only.

Related tools

Pair this with our college cost comparison calculator to size your savings target. Check FAFSA SAI to understand how the 529 balance interacts with aid. And for immediate cost management, the student budget calculator.