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Refinance the House at 6.5%–6.9% or Trade a $128,205 QDRO Share Instead? The Divorce Buyout Math After September 24's Rate Jump

The number that surprised me most: refinancing costs more than the new borrowing

Say you are keeping the house in the divorce. It is worth $400,000, and the mortgage balance is $200,000 at 3.25%. Your spouse's half of the $200,000 in equity is $100,000, and you need to pay it out somehow.

The obvious move is a cash-out refinance to $300,000. Most people compare the new payment to the old payment and stop there. That misses the biggest cost.

Every dollar in this post is a worked example I made up to show the formulas. The only market fact I'm relying on comes from NerdWallet's Mortgage Rates Today, Thursday, September 24. It said rates jumped that day after a global bond market sell-off. The 6.5% and 6.9% rates below are illustrative assumptions, not quotes. Your numbers will differ based on your specific situation.

Step 1: Price the refinance honestly

Payments below are principal and interest on a 30-year fixed loan, using standard amortization factors.

Current loanRefi at 6.5%Refi at 6.9%
Balance$200,000$300,000$300,000
Rate3.25%6.50%6.90%
Monthly P&Iabout $870about $1,896about $1,976
Increase vs. todayn/a+$1,026+$1,106
Year-one interestabout $6,500about $19,500about $20,700

Here is where the extra $1,026 a month at 6.5% comes from:

  • About $632 a month is the new $100,000 of borrowing at 6.5%. That is the buyout you knew about.
  • About $394 a month is the higher rate on the $200,000 you already owed. Refinancing replaces your 3.25% loan with a 6.5% loan. That is $4,728 a year that never shows up as a line item in the settlement.

The rate jump on September 24 is a smaller piece. Moving from 6.5% to 6.9% on $300,000 adds about $80 a month. That is $4,800 over 5 years, $9,600 over 10 years, and about $28,700 over the full 30 years. It's real money, but the bigger cost is giving up the old rate.

Add closing costs. If they run 2% of the new loan (an assumption; get a real Loan Estimate), that is $6,000 up front.

If you're weighing this, our post on keeping the house versus taking the 401(k) walks through the same trade-off from the retirement side.

This is the kind of analysis Sevalori runs for you, so you don't have to build the spreadsheet yourself.

Step 2: Price the alternative, a QDRO offset

The other route is to keep your 3.25% mortgage and give your spouse retirement money instead. You do that with a QDRO (qualified domestic relations order), which moves money from your 401(k) to theirs.

The catch is that $100,000 in a 401(k) is not worth $100,000 in your spouse's pocket. The money is pre-tax. Assume a 22% marginal tax rate on withdrawal, which is an example figure:

  • After-tax value of $1 of 401(k) money: 1 − 0.22 = 0.78
  • Pre-tax amount needed to equal $100,000 after tax: $100,000 ÷ 0.78 = $128,205

So a fair offset is about $128,205 of your 401(k), not $100,000. If your spouse's tax rate is lower, the number changes. At 12%, the offset is $100,000 ÷ 0.88 = $113,636. At 24%, it is $100,000 ÷ 0.76 = $131,579.

A distribution to an ex-spouse under a QDRO is generally exempt from the 10% early-withdrawal penalty. Your spouse still owes ordinary income tax on it, and the exception applies to that distribution only. If they roll it into their own IRA and withdraw later, the normal rules apply. Confirm the details with your plan administrator and a tax professional.

Step 3: Compare the two costs on the same basis

Both options cost you something. Here is each one measured in dollars per year.

Option A, refinance and pay cash:

  • Extra interest in year one versus keeping the current loan: $19,500 − $6,500 = $13,000 at 6.5%, or $20,700 − $6,500 = $14,200 at 6.9%.
  • You keep the full 401(k).
  • One-time closing costs of about $6,000.

Option B, keep the mortgage and give a $128,205 QDRO share:

  • No new interest and no closing costs.
  • You give up growth on $128,205 of pre-tax money. Assume 6% growth, which is an example. That is $7,692 pre-tax, or about $6,000 a year after tax.
Year-one costRefi at 6.5%Refi at 6.9%QDRO offset
Extra interest or forgone growth$13,000$14,200about $6,000
One-time closing cost$6,000$6,000$0
Year-one total$19,000$20,200about $6,000

In this example the QDRO offset is cheaper by roughly $13,000 to $14,000 in year one. That gap is mostly the value of your 3.25% loan.

Step 4: Test the assumption that drives the result

The comparison flips when the assumption behind it changes. Try these:

If your existing mortgage were already at 6.5%, there is no low rate to lose. The refi only adds interest on the incremental $100,000:

  • Refi: $100,000 × 6.5% = $6,500 a year
  • QDRO offset: about $6,000 a year

That is nearly a wash, with a $500 gap that closing costs would erase. At 6.9% the gap widens to about $900 a year.

If you expect higher returns on the 401(k), the offset gets more expensive. At 8% growth, the after-tax cost of giving up $128,205 is about $8,000 a year. That is above the $6,500 to $6,900 interest on the incremental $100,000, so in the "already at 6.5%" case the refi wins.

The break-even rule of thumb: compare your expected after-tax return on retirement dollars to your new mortgage rate. If the 401(k) will earn more than the loan costs, keep the 401(k) and borrow. If it will earn less, give up the retirement dollars and skip the loan. In the 3.25% example there is no realistic return that makes the refi win, because the higher rate on the whole $200,000 dominates.

If you want to see how this plays out at rates near 7%, our 3-way comparison of keeping the house, taking the QDRO, or selling puts a third option on the table.

Step 5: The things a calculator can't fully price, so check them yourself

Can your spouse actually come off the loan? Many lenders won't let one borrower simply drop off a mortgage. If your spouse stays on the loan, they carry the risk even after the divorce. A settlement that keeps your 3.25% loan may still require a refinance or an assumption. Ask your lender before you build the plan around Option B.

Can you qualify alone? A refi means qualifying on one income. Alimony and child support you receive may count, depending on the lender's rules. NerdWallet's first-time buyer coverage, First-Time Home Buyer Myths, DEBUNKED and 5 Things First-Time Homebuyers Wish They Knew, is a useful reminder here. Someone buying out a spouse and qualifying alone faces many of the same questions as a first-time buyer, and rules of thumb about what you need often turn out to be wrong for your situation.

How thin does your cash cushion get? This is where the September data matters. NerdWallet's These 3 Money Moves Take the Fright out of Fall reports that 35% of Americans say they'll need credit to cover at least some September expenses. If a refi drains your savings for closing costs, or a QDRO leaves you with less retirement money and no emergency fund, you may end up on that list. Credit at card rates is a much worse deal than either option above.

Where does your cash cushion sit? NerdWallet's Where's Ally? Why Big Names Miss Our Best Savings List makes the point that a solid, well-known savings account can still earn less than competing accounts. On a $30,000 reserve, a 0.5-point rate difference is about $150 a year (an example figure). It's small next to the buyout math, but it costs nothing to check.

Step 6: Layer on the pieces that change the answer

The refi-versus-QDRO decision doesn't sit alone. Four other calculations interact with it:

  1. Alimony. State formulas differ widely on amount and duration. If you receive alimony, it can help you qualify for the loan. If you pay it, it reduces your ability to carry the higher payment. Either way, it changes which option you can afford.
  2. Child support. Guidelines in every state depend on both incomes and the parenting schedule. A larger mortgage payment doesn't reduce the support you owe, so the cash-flow squeeze is yours.
  3. Social Security. If the marriage lasted at least 10 years, you may be eligible for a spousal benefit of up to 50% of your ex-spouse's benefit at full retirement age, provided you're unmarried and meet the other rules. That can change how much you need in your own retirement account. Our post on Social Security spousal benefit versus a bigger QDRO covers that trade-off.
  4. Equitable distribution. Your state's rules determine whether the equity split is 50/50 at all. In equitable distribution states, "equal" and "fair" aren't the same word. See How Equitable Distribution Actually Works.

You can model this for your specific situation at Sevalori.

A short checklist before you sign

Work through these in order:

  1. Get the real equity number. Use a current appraisal or a realistic comparable-sales estimate, minus the true payoff balance.
  2. Get an actual refi quote and Loan Estimate at today's rates. Rates moved on September 24, and a quote from last week is stale.
  3. Find your existing rate and your remaining term. The gap between your current rate and the new rate is the hidden cost.
  4. Convert every retirement dollar to after-tax dollars using each spouse's realistic marginal rate.
  5. Compare year-one cost and 10-year cost for each option, not just the monthly payment.
  6. Ask the lender whether your spouse can be released without a refi.
  7. Check your cash reserve after closing costs. If it's thin, price in the cost of using credit.
  8. Rerun the numbers at rates 0.4 points higher and lower. If the answer doesn't change, the decision is robust. If it flips, that's the variable to watch.

The takeaway

In this example, the QDRO offset was cheaper by about $13,000 to $14,000 in year one because keeping a 3.25% mortgage is worth a lot. The refi wins or ties when the old rate is already near market, when your expected retirement returns are high, or when your spouse must come off the loan and the lender won't release them.

Neither option is right for everyone. Your existing rate, your tax bracket, your expected returns, and your lender's rules decide it, and September 24's rate jump moves the refi side of the comparison against you by about $80 a month per $300,000 borrowed.

If you'd rather not build this yourself, Sevalori lets you plug in your own equity, rates, tax brackets, and state formulas, and see the year-one and long-term costs side by side before you sign anything.

This post is general education, not legal, tax, or financial advice. Have a divorce attorney and a tax professional review any settlement before you agree to it.

Sources

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