How to Calculate Private School vs. a School District House Premium: A 7-Step Formula With $18,500 Tuition and a $90,000 Premium
Say you're looking at a private school that charges $18,500 this year. Or you could stretch to buy in a district with a reputation for great public schools, where houses run about $90,000 higher than what you'd otherwise buy. Everyone you know has an opinion. Nobody has a number.
This post gives you the number, or at least a formula you can fill in yourself. The figures below are a worked example I constructed so the arithmetic is visible. Your tuition, your house market, and your mortgage quote will differ. That's the point of running it.
What This Week's Data Adds to the Calculation
Three inputs in this week's news move the math.
Inflation. The Bureau of Labor Statistics' "Major Economic Indicators" page shows CPI up +0.4% in August 2026. One month is noise, not a trend. But if it persisted, 1.004¹² works out to roughly 4.9% a year, and tuition tends to track or beat general inflation. That's why the calculator below tests a 5% tuition growth case.
Wages and jobs. The same BLS page shows average hourly earnings up just $0.10 (preliminary), payroll employment up 162,000 (preliminary), and unemployment at 4.1%. For anyone earning more than $25 an hour, a $0.10 raise is less than the 0.4% monthly price increase. Your household income may not be keeping pace with a tuition line that grows every year. Steady hiring at 4.1% unemployment is reassuring, but it says nothing about your own job.
Mortgage rates. NerdWallet's "Mortgage Rates Today, Friday, September 18" reports no change, as bond markets digest the week's Fed news. A flat market is useful because it gives you a stable quote to model. I use 6.8% below as an illustrative rate. Swap in your actual quote.
Step 1: Build the Tuition Path
Most people multiply this year's tuition by 13, which understates the cost. Tuition rises, so use a growing annuity:
Total tuition = T × (1.04¹³ − 1) / 0.04
Here T is year-one tuition and 4% is the assumed annual increase. With T = $18,500:
- 3% growth: $288,900
- 4% growth: $307,600
- 5% growth: $327,700
The gap between the 3% and 5% cases is about $38,800 for one child. In year 13 at 4% growth, that $18,500 tuition has become about $29,600 a year. If your school publishes its last five years of tuition, compute your own growth rate from that instead of guessing. For a deeper breakdown of this step, see our 6-variable 13-year cost formula.
Step 2: Add the Costs Outside the Tuition Line
Uniforms, registration and technology fees, fundraising asks, aftercare, and transportation don't show up in the tuition figure. Public school has extras too: supplies, activity fees, and sports.
For the example, I'll assume $2,400/year in private extras and $900/year in public extras, held flat for simplicity. Over 13 years that's $31,200 versus $11,700.
Private, one child, no aid: $307,600 + $31,200 = $338,800.
That averages about $2,172 a month of after-tax money for 13 years. That number matters for Step 7, when we talk about income.
Step 3: Subtract Any ESA or Voucher
If your state offers an education savings account or voucher, subtract it. The amount, eligibility rules, and whether it covers private tuition all vary by state and can change. So the $7,000/year here is a placeholder, not a real program figure. Held flat for 13 years, it's $91,000.
Private, one child, with the placeholder ESA: $338,800 − $91,000 = $247,800.
Check your state's actual rules before you plug anything in. Some programs have income caps or require you to leave the public system for a set period, and those conditions can change your answer.
Step 4: Price the House Premium Properly
People often quote the premium as if it were the cost. It isn't, because if the premium holds its value, you get it back when you sell. What you pay is the cost of carrying it for 13 years: interest plus extra property tax.
For a $90,000 premium, borrowed over 30 years at 6.8%, using standard amortization math:
- Monthly payment on the premium: about $587
- Interest paid over 156 payments (13 years): about $72,400
- Principal paid down (equity you keep): about $19,100
- Extra property tax at an example 1.1% rate: $990/year, or $12,870 over 13 years
Carrying cost: about $85,250. Add $11,700 in public-school extras and the district option costs about $96,950.
Two honest caveats. First, I assumed you borrow the whole premium. If you'd put cash down, add the investment return you're giving up on that cash. Second, I assumed the premium holds. It has held in many markets, but nothing guarantees it, and premiums can shrink.
For a longer treatment, see our comparison of private school tuition vs. a school district house premium.
This is the kind of analysis Zuvelanti runs for you, so you don't have to build the amortization spreadsheet yourself.
Step 5: Find the Break-Even Premium
Instead of asking "which is cheaper," ask how large a house premium would make the two options equal?
At 6.8%, each dollar of premium costs about $0.947 to carry over 13 years ($0.804 in interest plus $0.143 in property tax). So:
Break-even premium = (private total − public extras) / 0.947
For one child with no ESA: ($338,800 − $11,700) / 0.947 ≈ $345,300.
In this example, a district premium up to about $345,000 costs less than private school over 13 years. Above that, private school wins on cost. Your $90,000 premium is far below that line. Your real premium might not be.
Step 6: Scale for a Second Child
This is where the two options split. A house premium is paid once, however many kids use the schools. Tuition is paid per child.
Assume child two starts three years after child one and pays tuition at the then-current, higher price. That adds 1.04³ times the first child's path:
- Child two's tuition: $307,600 × 1.125 ≈ $346,000
- Two-child tuition: about $653,600
- Plus extras for two children: $62,400
- Private, two children, no aid: about $716,000
The district option barely changes: $85,250 carrying cost plus $23,400 in extras for two kids, or about $108,650.
| Scenario (example inputs) | Private total | District total | Gap | Break-even premium |
|---|---|---|---|---|
| 1 child, no ESA | $338,800 | $96,950 | $241,850 | ≈ $345,300 |
| 1 child, $7,000 ESA | $247,800 | $96,950 | $150,850 | ≈ $249,300 |
| 2 children, no ESA | $716,000 | $108,650 | $607,350 | ≈ $731,200 |
| 2 children, $7,000 ESA each | $534,000 | $108,650 | $425,350 | ≈ $539,100 |
Our analysis of two kids over 13 years walks through more sibling-timing variations.
Step 7: Put a Price on the College-Admission Argument
The most common non-financial reason people give for private school is better college outcomes. Model it as an expected value:
Expected value = (extra probability of the outcome) × (dollar value of the outcome)
I don't have evidence for what any given school does to any given child's odds. So treat these as illustrative inputs only. Say the outcome is worth $500,000 to your family in lifetime net benefit. To justify a $241,850 gap, private school would have to raise the probability by about 48 percentage points. At a $100,000 value, no probability increase is enough to close the gap.
That doesn't mean private school has no value. Class size, a particular program, a learning-support fit, or a child who's struggling where she is are all real reasons. But it does mean the admissions argument alone rarely closes a gap this size. If it's your main reason, write down your actual assumptions and see whether they hold up.
Where the Two Options Genuinely Differ
The private-school side of the ledger:
- Tuition is usually paid year to year, so you can change course if income drops (check your enrollment contract for withdrawal terms).
- You're not tied to a house or a commute.
- You can pick a school for a specific need.
The house-premium side:
- Cash flow is front-loaded but flat. In year one, private school costs about $20,900 (tuition plus extras) versus about $8,930 for the district (carrying cost plus extras). By year 13, private is about $32,000 against the same $8,930.
- The premium is an asset, not just a cost, but it exposes you to local housing prices.
- The mortgage isn't cancelable. If you lose income, you can't drop it the way you might drop tuition.
- The district may not have listings you can afford, and moving costs aren't in these numbers.
Neither side wins automatically. In the example, the district route is cheaper on paper, but a job shock or a bad housing market could reverse that.
Stress-Test Before You Trust Any Number
Change one input at a time and see what moves.
| Input | Low | Base | High |
|---|---|---|---|
| Tuition growth (13-yr tuition) | 3%: $288,900 | 4%: $307,600 | 5%: $327,700 |
| Mortgage rate (13-yr interest on $90,000) | 6.3%: $66,600 | 6.8%: $72,400 | 7.3%: $78,200 |
| Total premium carrying cost with tax | $79,400 | $85,250 | $91,100 |
Notice the asymmetry. A one-point change in tuition growth moves the cost by roughly $19,000 to $20,000, while a full point of mortgage rate moves the premium's carrying cost by about $11,700. Tuition growth is the more sensitive assumption. This week's +0.4% CPI reading is a reason to test the high case, though not a reason to assume it.
You can run all of these variations for your own numbers at Zuvelanti.
Small Levers vs. Big Levers
Some of the week's other articles touch the same decision from the side.
Down payment help. NerdWallet's "Locked Out: Should You Take 'Free Money' to Buy a Home?" says homebuying assistance can lower upfront costs but the trade-offs deserve weighing. If a premium-district purchase depends on it, read the terms for anything that triggers if you sell or refinance before year 13. That could change the break-even.
Rewards. NerdWallet's "How I Earned 1 Million Points With My Family Cruise Booking" shows big-ticket family purchases can earn real miles when booked through the right portal. It's a fair lever, but points are worth hundreds or a few thousand dollars against a gap of $150,000 to $600,000. If you pay tuition by card, check for a processing fee first. A 3% fee on $18,500 would be $555, which could wipe out the rewards.
Income. NerdWallet's "Quiz: What's the Best Way to Make Money?" is a reminder that side income is a real lever. The Step 2 total works out to roughly $2,172 a month after tax, on average. Replacing that with side income means earning more than that pre-tax, and doing it for 13 years. For a check on the household side, see what wages growing $0.10 an hour means for an $18,500 tuition.
Run It With Your Numbers
The example produced a $241,850 gap for one child and $607,350 for two, but those figures belong to my example. Yours will differ because your tuition, growth rate, state ESA rules, local premium, mortgage quote, number of kids, and how much room your budget has all differ. I ran my own family's numbers before deciding, and the result surprised me. The break-even premium shifted by six figures once I stopped using round numbers.
If you want to see where your family lands, Zuvelanti models the 13-year tuition path, the house premium, ESA offsets, and sibling timing side by side, so you can decide with your own math instead of someone else's rule of thumb.
Sources
- Major Economic Indicators Latest Numbers — Bureau of Labor Statistics
- Locked Out: Should You Take ‘Free Money’ to Buy a Home? — NerdWallet
- How I Earned 1 Million Points With My Family Cruise Booking — NerdWallet
- Quiz: What’s the Best Way to Make Money? — NerdWallet
- Mortgage Rates Today, Friday, September 18: No Change — NerdWallet