Renting vs. Buying With $60,000 Down: Does a 529 Beat a Home Above a 7% Mortgage Rate?
Say you have $60,000 sitting in savings. It's the 20% down payment on a $300,000 house, and you also have kids who will need college money. You've been told to buy. You've also been told to open a 529. Nobody has shown you the math on both.
NerdWallet's mortgage rates update for Wednesday, September 23 says rates are easing on a glimmer of economic optimism from Iran, but are still above 7%. In a separate piece, a NerdWallet mortgage content editor explains why she still rents at 54. Her reasoning compares real down payment costs, investing returns, and the true price of owning.
Her situation isn't yours, but the question is the same one: what is the best use of the next $60,000 when you have both a housing decision and a college goal?
Below I run four options side by side. Every figure here is an example I built with stated assumptions. It is not a forecast, and yours will differ.
The four options for the same $60,000
The assumptions:
- 15-year horizon, which fits a child who is about 3 years old today
- 6.0% gross annual investment return before fees
- 529 withdrawals used for qualified education expenses, so growth is federal tax-free
- Taxable account: 15% tax on dividends along the way, and 15% on gains when sold
| Option | Annual cost or drag | Net return | Value after 15 years |
|---|---|---|---|
| A. Low-fee 529 (0.10% expense ratio) | 0.10% | 5.90% | $141,770 |
| B. High-fee 529 (0.85% expense ratio) | 0.85% | 5.15% | $127,430 |
| C. Taxable brokerage (about 0.05% fee, tax drag, gains tax at sale) | about 0.28% plus gains tax | about 5.72% before final tax | $126,470 after tax |
| D. Prepay a 7% mortgage (assumes you already own) | none | 7.00% | $165,540 in interest avoided and equity |
Three of those rows come from one comparison. The gap between A and B is $14,340 on a single $60,000 deposit, and the only cause is a fee difference of 0.75 percentage points. I go deeper on that in 529 Plan Hidden Fees: How a 0.75% Expense Ratio Difference Costs $16,500 Over 18 Years.
The gap between A and C is about $15,300. Tax-free growth on qualified expenses does most of that work.
This is the kind of side-by-side Nelovanti runs for you, so you don't have to build the spreadsheet yourself.
Why option D isn't the obvious winner
Row D looks like the winner. A 7% return with no market risk beats 5.9%. Two things weaken it, though.
1. It only applies if you already have a mortgage. A renter has nothing to prepay. That's the renter's side of the NerdWallet editor's argument. If you don't buy, the $60,000 is free to invest, and the question becomes 529 vs. taxable account (rows A through C).
2. The 7% is a break-even hurdle, not a bonus. Prepaying a 7% loan saves you 7% a year in interest. A 529 that nets 5.9% expected trails that. But the 529 return is uncertain, and it can be boosted by a state deduction. That's the part a simple comparison misses.
In the same example, suppose your state gives a deduction on 529 contributions worth 5% of what you put in. That's a rate I'm assuming here, not a rule. On the full $60,000 it would be worth $3,000 in first-year tax savings. Add that to the low-fee 529 and the effective first-year gain is 5% before any growth. That closes much of the gap to a 7% mortgage.
But states differ. Some cap the deduction, some have none, and some let you claim it on contributions to any state's plan. I break down the details in In-State vs. Out-of-State 529: The 6-Question Checklist That Decides a $21,600 Difference in College Savings.
The monthly cost of owning vs. renting
The lump sum is only half the picture. The other half is the monthly gap between renting and owning.
Here's the example, using the same $300,000 house with $60,000 down and a 30-year loan at 7%:
| Monthly item | Buy (example) | Rent (example) |
|---|---|---|
| Principal and interest on $240,000 at 7% | $1,597 | n/a |
| Property tax (assumed 1.1% of value per year) | $275 | n/a |
| Homeowner's insurance (assumed) | $125 | n/a |
| Maintenance (assumed 1% of value per year) | $250 | n/a |
| Rent (assumed) | n/a | $1,900 |
| Total | $2,247 | $1,900 |
In this example the renter has $347 a month less in housing costs. Put that $347 a month into a low-fee 529 at 5.9% for 15 years and it grows to about $100,100. Add the $141,770 from the lump sum and the renter's education fund is roughly $241,900.
That number is not the whole story, and the owner has an answer. The owner also builds home equity and, in the example, the mortgage balance falls each month. A rent-vs-buy comparison that ignores home appreciation, rent increases, and selling costs is incomplete. The NerdWallet editor's piece is worth reading for that reason, since it looks at the true price of homeownership rather than just the payment.
The takeaway isn't "renting wins." It's that the buy-vs-rent decision and the 529 decision are one decision, because both draw from the same pool of dollars. If you're weighing this on a 7%+ mortgage, my earlier posts on 529 contributions vs. extra mortgage payments and the 6-question checklist with the $421 break-even show how sensitive the answer is to the rate.
Small leaks count too
NerdWallet also ran a piece on surprise bags, where you don't know which product is inside until you open it. The appeal is the mystery. The downside, as NerdWallet puts it, is for your wallet.
That's a small habit, but here is what small habits add up to. Assume you spend $25 a week on something like this. That's $1,300 a year, or about $108 a month. Put that $108 a month into a 5.9% 529 for 15 years and you get about $31,150, of which only $19,500 is money you contributed.
You don't have to give up a treat. The point is that the unglamorous $108 a month has a price tag you can calculate. Most families I talk to have one or two categories like that, and they rarely know the number until they run it.
Fees hide in places other than 529 plans
NerdWallet reports that the Chase Freedom Flex is dropping its foreign transaction fee and cell phone insurance, with a heightened welcome bonus for a limited time. One benefit went away, one cost went away, and a bonus showed up.
I bring this up for the general lesson: products change their terms, so a decision you made once may not stay right. To illustrate a fee's scale (an assumed figure, not from the article), a 3% fee on $5,000 of foreign spending is $150.
529 plans change too. An investment option gets renamed, a plan cuts its fees, or a state changes its deduction. A plan you picked years ago might not be the best one today, and it's worth checking every year or two.
Why state politics can matter for your 529
NerdWallet also covered how data centers have become a bipartisan flashpoint in the 2026 midterms, as anticipated costs and local impact fuel voter backlash nationwide.
I'm not going to speculate about your state. The connection is that state budgets and tax policy are politically live. A 529 deduction is a state tax benefit, and state tax benefits can be changed by legislators. If your plan choice depends on a deduction, look at how much of your return comes from it. In the example above, a 5% deduction on $60,000 is $3,000. If you lose the deduction, you lose that $3,000, but you keep the lower fees in the plan you already picked.
That's why I favor a plan that still works when the deduction is removed. In the example, the low-fee 529 (row A) beat both the high-fee 529 and the taxable account even without any deduction.
Two kids, one pool of money
Everything above used one $60,000 deposit. With two children, the split matters.
Take the same low-fee 529 at 5.9% and split the $60,000 evenly as $30,000 per child. Child 1 (15 years to go) ends up with about $70,890. Child 2, who is 3 years younger, has 12 years to grow, so the same $30,000 becomes about $59,700 (1.059 to the 12th power is about 1.99).
That's an $11,190 difference between the two accounts from timing alone. If you want both accounts to end up equal at enrollment, the younger child needs a bigger share now, or the same monthly amounts need to run for longer. I go through the mechanics in 529 Plan Optimization for Two Kids.
What to check before you decide
Here are the questions that decide which row of the table applies to you:
- Do you already have a mortgage? If so, you're comparing row D to rows A through C. If you rent, only A through C apply.
- What does your state give you? A deduction, a credit, or nothing? Does it apply to out-of-state plans?
- What are the plan's total fees? A 0.75-point gap was worth $14,340 on $60,000 in the example.
- How many years does each child have? The 3-year age gap above cost $11,190 in the example.
- Do you have an emergency fund? Locking $60,000 into any of these options while short on cash is a risk of its own.
- How likely is it that the money will be used for education? A 529 has an early-withdrawal penalty on the growth if it isn't used for qualified expenses. Taxable accounts don't. Check the current rules for your situation, since they change.
Where the math is honest about its limits
To be plain about it, the example is simplified and no one can tell you the right answer without your inputs. I assumed a 6% gross return, a flat 1.1% property tax, and a $1,900 rent. Every one of those is something you can replace with your own number. A 1-point change in the return assumption alone would move the 15-year values by tens of thousands of dollars.
I'm also not saying you should rent, buy, or open a 529. If you love the house and plan to stay 20 years, buying might be the right call even if the spreadsheet says otherwise. If your state's plan is a close call on fees and gives you a good deduction, the in-state plan might beat the low-fee out-of-state one. The math should inform the decision, not replace it. For a comparison between a state plan and Utah's plan, see Home State 529 vs. Utah My529 vs. High-Fee Plans.
You can model this for your own situation at Nelovanti. Enter your state, your children's ages, your housing costs, and the fees on the plans you're considering. You'll see how the four options compare on your numbers, not on the example's.
The bottom line
With mortgage rates still above 7%, the cost of borrowing is high and a guaranteed 7% return from prepaying is hard to beat on a pure-return basis. But if you rent or haven't bought yet, a low-fee 529 beat both a high-fee 529 and a taxable account in the example, by $14,340 and about $15,300 respectively on $60,000 over 15 years. Your monthly housing cost, your state's deduction, your fees, and your kids' ages will decide which option is best for you.
Run your own figures before you commit. The gap between the best and worst choice was five figures in this example, and it may be in yours too. Start at nelovanti.smarttechinvest.com.
Sources
- I Edit Mortgage Advice for a Living — and Still Rent — NerdWallet
- Data Centers Are a Potent, Bipartisan Battleground in the Midterms — NerdWallet
- Mortgage Rates Today, Wednesday, September 23: Easing, But Still Above 7% — NerdWallet
- I Can’t Stop Buying Surprise Bags — NerdWallet
- Chase Freedom Flex Ditches Foreign Transaction Fee, Cell Phone Insurance — NerdWallet