Keep the House at 7%+ Rates or Split the 401(k) Instead? A Side-by-Side Divorce Comparison With a $500,000 Home and a 1.5% Break-Even
Picture a couple finalizing a divorce this week. They own a $500,000 house with a $300,000 mortgage at 3.25%. Spouse A has a $400,000 pre-tax 401(k). Nothing else is in the pot, so the net marital estate is $600,000 and "50/50" means $300,000 each.
Spouse B wants to keep the house. Spouse A says, "Fine, but you'll refinance me off the loan." Then B looks up rates. NerdWallet's "Mortgage Rates Today, Monday, September 28: A Little Lower, But Still Above 7%" says rates dipped but remain solidly above 7%.
That is the decision this post compares: keep the house at 7%+ and take less 401(k), or sell and take more 401(k) and cash. Everything below is a worked example I built. The rates, returns and tax bracket are assumptions, so your numbers will differ.
The two options side by side
Option 1: Keep the house. B keeps $200,000 of equity ($500,000 minus $300,000). B also gets $100,000 of the 401(k) through a QDRO, for $300,000 nominal. A keeps the other $300,000 of the 401(k).
Option 2: Sell and split. The house sells with 6% costs ($30,000), leaving $170,000 net, or $85,000 each. The 401(k) splits $200,000 each. B's nominal total is $285,000, which is already $15,000 short of "equal" because selling costs are real.
The nominal totals are close ($300,000 vs. $285,000), but the assets behave very differently. That is why 50/50 on paper rarely means 50/50 in practice. For more on that gap, see When a "50/50" Divorce Settlement Isn't Equal.
Step 1: What the refinance does to your monthly payment
Refinancing $300,000 over 30 years:
| Rate | Monthly principal + interest | Annual | 10-year total |
|---|---|---|---|
| 3.25% (existing loan) | $1,306 | $15,668 | $156,676 |
| 7.25% (example rate, above the 7% NerdWallet reports) | $2,047 | $24,559 | $245,585 |
| Difference | $741/month | $8,891 | $88,909 |
That is roughly $89,000 over ten years, paid to the lender to remove your ex from the loan.
One honest caveat: some lenders allow a divorcing spouse to assume an existing loan, with qualification. If yours does, the 3.25% loan may be worth far more than the house equity suggests. Ask before you assume a refinance is your only route.
Step 2: The tax haircut on the 401(k)
A QDRO transfer itself isn't taxed when it moves into your own retirement account. The tax arrives when you withdraw. I'll assume a 24% effective rate on pre-tax dollars in retirement, which is an example only.
- Option 1: $100,000 pre-tax is worth about $76,000 after tax.
- Option 2: $200,000 pre-tax is worth about $152,000 after tax.
So the after-tax "equal" split is not equal. A dollar of house equity and a dollar of pre-tax 401(k) are different dollars. We go deeper on this in Keep the $580,000 House or Take the 401(k)? The After-Tax Divorce Settlement Math.
Step 3: The 10-year head-to-head
Assumptions, all labeled as examples:
- Home appreciates 3% per year.
- Investments earn 6% per year.
- Rent for an equivalent home roughly equals the owner's total cost of taxes, insurance, maintenance and interest.
- A future sale costs 6%.
- The 7.25% loan is fully amortizing, leaving a balance of about $258,900 after 10 years.
| Ten years out | Keep the house | Sell and split |
|---|---|---|
| Home value ($500,000 at 3%) | $671,958 | n/a |
| After 6% selling costs | $631,641 | n/a |
| Minus remaining mortgage | −$258,940 | n/a |
| Net home equity | $372,701 | n/a |
| Cash ($85,000 at 6%) | n/a | $152,220 |
| 401(k) after 24% tax (grown at 6%) | $136,100 | $272,200 |
| Total | $508,800 | $424,400 |
At 3% appreciation, keeping the house comes out about $84,400 ahead. Many people find that surprising at 7%+ rates. The reason is leverage: you keep appreciation on the full $500,000 while paying interest on only $300,000.
Step 4: Where the answer flips
Appreciation is the assumption that swings the result most:
| Annual home appreciation | Keep minus sell (10 years) |
|---|---|
| 0% | −$77,260 (selling wins) |
| 1.5% | about breakeven |
| 3% | +$84,400 |
| 5% | +$218,300 |
The break-even is roughly 1.5% appreciation per year. If you think your local market will beat that, keeping the house looks better on this math. If you expect flat prices, or you'd be stretched thin by the payment, selling wins by about $77,000.
The 7.25% rate also matters. Every rate change moves the $741 monthly gap. Our post Keep the House or Take a Bigger QDRO in September 2026? covers that sensitivity in more depth.
This is the kind of analysis Sevalori runs for you, so you don't have to build the spreadsheet yourself.
Step 5: The stock market wildcard
Option 2 puts $200,000 of your settlement into a 401(k), twice the exposure of Option 1. That matters right now. Mr. Money Mustache's "Will the AI Bubble Destroy our Retirement?" notes that the market keeps surprising people, and that we worry when it crashes and also when it hits record highs.
Here is the arithmetic for a 20% drop:
- Option 1: $100,000 pre-tax falls by $20,000.
- Option 2: $200,000 pre-tax falls by $40,000.
Two things follow:
- Check how the QDRO is worded. A fixed dollar amount, a percentage as of a valuation date, and a percentage "plus or minus gains and losses" produce different results if markets move between signing and transfer. At record highs, that wording matters more.
- Think about which asset you'd rather have if the market falls. A crash hurts the retirement account. A housing slump hurts the house. Neither is safe. You are choosing which risk you can live with.
If you're weighing a stock correction against alimony, QDRO on a $312,000 401(k) vs. Fixed Alimony walks through that trade-off.
Step 6: Inflation and jobs data that touch your alimony and support
The Bureau of Labor Statistics' "Major Economic Indicators" page shows CPI up 0.4% in August 2026, unemployment at 4.1%, payrolls up 162,000 (preliminary), and average hourly earnings up $0.10 (preliminary).
Inflation and fixed alimony. One month is not a trend, but annualizing 0.4% gives about 4.9% (1.004¹² ≈ 1.049). That is a stress test, not a forecast. If a $3,000/month fixed alimony award ran ten years:
- At 3% inflation, it buys about $2,232 in today's dollars by year ten.
- At 4.9% inflation, it buys about $1,859.
The cumulative shortfall is large, and it is why a cost-of-living clause can be worth negotiating. See Fixed Alimony vs. COLA-Adjusted Alimony. If you'd be paying alimony, the same clause works against you, so model both sides.
Unemployment and imputed income. At 4.1%, courts and opposing counsel may argue a non-working or underemployed spouse can find work, which affects imputed income in child support and alimony. Whether that argument works depends on your state's guidelines and your job history. It is a variable to test, not a given.
Step 7: The Social Security spousal benefit
If your marriage lasted at least 10 years, you may be eligible for a spousal benefit on your ex's record. A larger QDRO share does not replace that, and claiming rules are separate from the settlement. Our post Social Security Spousal Benefit vs. Bigger QDRO covers how to weigh them. If you're close to the 10-year mark, the date you sign can matter.
A note on bank bonuses and your new cash
Option 2 hands B $85,000 in cash, and that raises the question of where to park it. NerdWallet's "Should I Switch to a New Bank Just to Earn a Bonus?" says bonuses usually take effort and that you should weigh the requirements before chasing one.
For someone mid-divorce, that comes with cautions:
- A bonus is typically a few hundred dollars. Compare it to what your own time and the requirements (direct deposit, minimum balances, monthly fees) cost you.
- Don't move marital funds into a new account during the divorce without your attorney knowing. It can look like hiding assets and complicates disclosure.
- After the decree, opening accounts in your own name is worth doing. Just make the interest rate and fees the main criteria, with the bonus as a tiebreaker.
What this comparison doesn't capture
- Carrying costs beyond the mortgage. I assumed rent roughly matches ownership costs. In your city that gap could be $500 a month either way.
- Liquidity. Home equity can't pay for an emergency. Cash and 401(k) money can (with taxes and possible penalties on the latter).
- Your tax bracket. At 12% or 32%, the after-tax 401(k) values shift materially.
- State rules. Whether the house is separate or marital property, and how alimony and child support formulas treat the housing payment, vary by state.
- Your qualification. Whether you can qualify for the refinance on your income alone comes first, and can end the "keep" option before the math begins.
Each is a checkpoint in Should I Accept This Divorce Settlement? 6 Calculations That Catch $85,000+ in Hidden Gaps.
Bottom line
In this $500,000-house example, keeping the home at a 7.25% refinance beat selling by about $84,400 over ten years at 3% appreciation, lost by about $77,000 at 0%, and broke even near 1.5% per year. The verdict depends on your home, your rate, your tax bracket and how much market risk you can tolerate. The mortgage rate cost of about $741 a month and the 24% haircut on pre-tax dollars are the two numbers most people leave out.
Your house value, loan balance, retirement balances, state and tax bracket will produce a different answer. You can run this comparison with your own numbers at Sevalori before you sign anything.
Sources
- Mortgage Rates Today, Monday, September 28: A Little Lower, But Still Above 7% — NerdWallet
- Will the AI Bubble Destroy our Retirement? — Mr. Money Mustache
- Should I Switch to a New Bank Just to Earn a Bonus? — NerdWallet
- Major Economic Indicators Latest Numbers — Bureau of Labor Statistics
- This Tahoe Hotel Got a Glow-Up, but Missed a Few Spots — NerdWallet