Most usable funds at the education date
dependsWeighted across your three outcomes the 529 comes to $118,608 against the brokerage's $115,717.
SwitchWize decision guide
529 plan or taxable brokerage account: where should you save for a child?
This is a decision under genuine uncertainty, and the usual answer hides that. A 529 plan is clearly better if the money is spent on qualified education expenses and clearly worse if it never is. Averaging those into a single figure describes neither outcome, so this guide shows all three: fully used, partly used, and never used.
What you can expect
- No login required
- No credit pull
- Assumptions shown
- Sources included
Quick answer
Fund the 529 up to the amount you are genuinely confident will go on education, and keep the rest somewhere no penalty can reach. The mistake worth avoiding is not choosing wrong, it is committing everything to one account when you cannot yet know the answer.
If 529 plan
Better when education is near certain: the tax-free growth compounds and nothing is taxed on the way out.
If brokerage
Better when education is genuinely uncertain, because there is no penalty, no qualified-use test, and no need to change beneficiaries.
Key number to watch
The 529 is ahead by $6,072 if the money is spent on education, and behind the brokerage entirely if it never is. Your answer to this question decides which of those you get.
Test your situation
See your result in dollars
Change any number below to match your situation. No login is required, and your entries stay in this browser.
$
What you can realistically contribute each year.
yrs
Longer horizons make the tax-free growth worth more, and the uncertainty larger.
%
Be honest rather than hopeful. This input decides the answer.
%
The three chances must total 100%.
%
Trade school, a scholarship, no college at all. This is not a remote possibility.
Your answer so far
At a 70% chance of education use this is genuinely uncertain, and splitting between the two accounts beats committing to either. Fund the 529 up to what you are confident will be spent on education, and keep the rest where no penalty can reach it. If it goes on education the 529 is ahead by $6,072. If it never does, it leaves $9,836 less than the brokerage would have.
See the full breakdownAt a 70% chance of education use this is genuinely uncertain, and splitting between the two accounts beats committing to either. Fund the 529 up to what you are confident will be spent on education, and keep the rest where no penalty can reach it. If it goes on education the 529 is ahead by $6,072. If it never does, it leaves $9,836 less than the brokerage would have.
529 plan
$118,608
weighted across your three outcomes
Taxable brokerage account
$115,717
usable for anything, at any time
-$2,891 vs. baseline
Try a scenario
What could change this
The 529 is ahead by $6,072 if the money is spent on education, and behind the brokerage entirely if it never is. Your answer to this question decides which of those you get.
How certain: moderate
At most $35,000 can ever move to the beneficiary's Roth IRA, and only if the account is old enough and they have the earned income to match. It is a relief valve, not a reason to overfund.
How certain: high
Check these assumptions
- • No state tax benefit is included. Many states offer a deduction or credit for 529 contributions and some offer nothing at all; we do not yet hold verified rules for NY, so this shows zero rather than a guess. Check your own state plan, because the benefit can be worth more than everything else on this page.
What matters most
Freedom to change your mind
BrokerageA brokerage account has no qualified-use rules and no penalty. That flexibility is what you are paying for in tax drag.
Tax treatment if the plan works out
529 planGrowth and qualified education withdrawals are both untaxed, which no taxable account can match.
Side-by-side comparison
Tax on growth
- 529 plan
- None
- Brokerage
- Annually, on distributions and realised gains
Tax on withdrawal for education
- 529 plan
- None
- Brokerage
- Capital gains tax on the gain
Tax on withdrawal for anything else
- 529 plan
- Income tax plus a 10% penalty, on the earnings
- Brokerage
- Capital gains tax only, no penalty
Contribution limit
- 529 plan
- High, set by the state plan
- Brokerage
- None
If the child does not go to college
- 529 plan
- Change beneficiary, or pay tax and penalty, or roll a capped amount to a Roth IRA
- Brokerage
- Nothing happens; use it for anything
State tax benefit
Not counted in the figures here, because we hold verified rules for no state yet.
- 529 plan
- Often available; varies enormously by state
- Brokerage
- None
What could go wrong
529 education savings plan
- What needs to work
- The money is genuinely spent on qualified education expenses, which are narrower than most people assume.
- Common problem
- Overfunding on the assumption that leftover money can simply be rolled into a Roth IRA. It can, but only up to a lifetime cap, only after 15 years, only excluding recent contributions, and only up to the beneficiary's earned income.
- What it could cost
- Income tax plus a 10% penalty on the earnings, which on a long-held account is the larger part of the balance.
- How to prepare
- Partly. The beneficiary can be changed to another family member, which is usually the better first move.
Taxable brokerage account
- What needs to work
- You hold long enough, and turn over little enough, that the annual tax drag stays modest.
- Common problem
- Assuming the flexibility is free. On a fifteen-year horizon the drag is a real number, and it is what you pay for keeping your options open.
- What it could cost
- The compounding you gave up versus a 529 whose money did go on education.
- How to prepare
- Fully flexible, and you can always open a 529 later once the picture is clearer.
A simple backup plan
Fund the certain part, keep the uncertain part free
The split is not a hedge for the indecisive. It matches each account to the part of the goal it actually fits.
- 1Estimate the amount you are genuinely confident will go on education, not the amount you hope will.
- 2Fund the 529 to that figure and no further.
- 3Hold the remainder in a taxable brokerage account, where no penalty can reach it.
- 4Check whether your own state gives a deduction or credit, because it can be worth more than everything else here.
- 5If a 529 does end up overfunded, change the beneficiary before reaching for the Roth rollover.
Educational illustration only. The right amount depends on your needs and timing.
What to do next
Question 1
Are you confident this money goes on education?
Yes: The 529 is the stronger account.
No: Split it, or use a brokerage account.
Question 2
Does your state give a deduction or credit?
Yes: That can outweigh everything else here. Check the terms of your own state plan.
No: Then the decision rests on the qualified-use question alone.
Question 3
Might the money end up going to someone else?
Yes: A 529 beneficiary can be changed to another family member, which is more useful than the Roth rollover.
No: Fund with more confidence.
Plain-text decision tree. Are you confident this money goes on education? If yes, The 529 is the stronger account. If no, Split it, or use a brokerage account. Does your state give a deduction or credit? If yes, That can outweigh everything else here. Check the terms of your own state plan. If no, Then the decision rests on the qualified-use question alone. Might the money end up going to someone else? If yes, A 529 beneficiary can be changed to another family member, which is more useful than the Roth rollover. If no, Fund with more confidence.
When to check again
- The IRS or your state changes education tax rules.
- The child's plans become clearer, in either direction.
- A scholarship arrives.
- The balance grows past what education is likely to cost.
Methodology
Both accounts receive the same contribution at the start of each year and earn the same return, less fund expenses. The brokerage additionally pays annual tax drag on distributions and realised gains. The 529 is then shown under three outcomes: fully spent on qualified education with no tax, partly spent with tax and penalty on the unused earnings, and never spent with tax and penalty on all the earnings. A probability-weighted figure is reported after those three, never instead of them.
The nonqualified penalty rate and the Roth rollover conditions come from federal rules for the selected tax year. Returns, tax rates and probabilities are your assumptions and are labelled as such.
- • No state tax benefit is included. Many states offer one and some offer nothing; we hold verified rules for none of them yet, so this shows zero rather than a guess.
- • Financial aid treatment is not modelled. Who owns the account affects it and the rules are their own subject.
- • Qualified education expenses are narrower than most people assume, and the definition changes.
- • Changing the beneficiary to another family member is often the best answer to an overfunded 529 and is not modelled here.
- • This is education, not tax advice.
Reviewed when federal education tax rules change, and quarterly otherwise. Editorial conclusions do not depend on affiliate availability.
Sources
IRS Topic 313: qualified tuition programsChecked August 15, 2026 · high confidence
Qualified expenses, and the tax and penalty on nonqualified distributions.
IRS Publication 970: tax benefits for educationChecked August 15, 2026 · high confidence
Scholarship exception and the definition of qualified expenses.
IRS: contribution limits for retirement plansChecked August 15, 2026 · high confidence
The annual IRA limit that caps each year of a 529 to Roth rollover.
Frequently asked questions
What happens if my child does not go to college?
You can change the beneficiary to another family member, which is usually the best answer. Failing that, the earnings are taxed as income and hit with a 10% penalty on withdrawal. Your contributions come back untouched, so the damage is confined to the growth.
Can I roll a 529 into a Roth IRA?
Some of it, under conditions. The lifetime cap is $35,000 per beneficiary, the account must have been open at least 15 years, contributions from the last five years are excluded, and each year's transfer cannot exceed the beneficiary's earned income or the annual IRA limit. It is a relief valve, not a reason to overfund.
Is a 529 worth it if I am not sure about college?
Partly. Fund it to the amount you are confident about and keep the rest in a taxable brokerage account. The calculator above shows all three outcomes so you can see what the uncertain portion actually costs you in each.
Does a scholarship remove the penalty?
Up to the scholarship amount, yes. The income tax on those earnings still applies, and anything beyond the scholarship is still penalised. It softens the outcome rather than removing it.
What about my state tax deduction?
It can be worth more than everything else on this page and it varies enormously, so check your own state plan. This guide deliberately shows zero rather than a plausible-looking guess, because you would have no way to tell the difference.
Is the tax drag on a brokerage account really that large?
It depends almost entirely on turnover. A low-turnover index fund costs far less to hold in a taxable account than an actively managed one. Change the drag input above and watch the gap move.
Should I use both accounts?
For most families in genuine uncertainty, yes. It is not fence-sitting: each account is matched to the part of the goal it actually fits.