$400K House Equity vs. a $400K 401(k) at Age 54: The After-Tax Math and the Social Security Divorced-Spouse Benefit That Change Who Gets More
Your spouse's offer: you keep the house ($400K in equity), they take the 401(k) ($400K). Both of you are 54, married 22 years. It looks like a clean $400K each. Is it?
Not after taxes, selling costs, and the ongoing price of owning a home. On the example below, the "equal" split leaves one spouse about $37,300 ahead once you convert both assets to spendable dollars. Add the Social Security divorced-spouse benefit, and the picture shifts again.
This post walks through the math. Your numbers will differ based on your state, tax bracket, home basis, and marriage length. That's the point: the right answer depends on your variables, and you should model them before you sign anything.
This is education, not legal advice. Consult your attorney for legal questions.
Why a house and a 401(k) aren't the same $400K
A traditional 401(k) is a pre-tax account. Nobody has paid income tax on that $400K yet. Every dollar you withdraw is taxed as ordinary income. Home equity has already been taxed. You paid for it with after-tax dollars, and you may owe little or nothing when you sell it.
They also differ in liquidity. You can't pay a grocery bill with a bathroom. The house has to be sold, borrowed against, or lived in. Living in it has a cost.
A NerdWallet piece, "I Edit Mortgage Advice for a Living — and Still Rent," makes this point from the buyer's side. A mortgage editor at 54 compares the real down payment, what that cash could earn invested, and the true price of homeownership, and she chooses to rent. You don't need to agree with her to take the lesson. Home equity is not free value. It's capital tied up in an asset that charges you taxes, insurance, and maintenance every year.
The worked example: assumptions
These are illustrative numbers, not predictions:
- Home value: $700,000. Mortgage: $300,000. Equity: $400,000.
- Home purchase price plus improvements (tax basis): $350,000.
- 401(k): $400,000, all pre-tax.
- Assumed blended tax rate on 401(k) withdrawals: 22%. This is a flat simplification. Your real rate depends on other income and how you draw it down.
- Selling costs: 6% of sale price.
- Federal capital gains rate: 15%. State taxes are ignored to keep the math clear.
- Post-divorce filing status: single, so the IRC §121 home-sale exclusion is $250,000, not the $500,000 married couples can claim.
The 401(k) side
$400,000 × (1 − 0.22) = $312,000 after tax.
One point works in your favor. Money paid to a spouse under a valid QDRO (qualified domestic relations order, the court order that lets a plan pay part of your retirement account to your ex) is exempt from the 10% early-withdrawal penalty under IRC §72(t)(2)(C). But the exemption applies to the distribution from the plan. Regular income tax still applies. If you roll the money into your own IRA instead, you avoid both, but you also lose that penalty-free access. We cover this trade-off in IRA Transfer in Divorce vs. QDRO.
The house side (if it's sold)
| Line item | Amount |
|---|---|
| Sale price | $700,000 |
| Selling costs (6%) | −$42,000 |
| Mortgage payoff | −$300,000 |
| Net cash before tax | $358,000 |
| Gain: $700,000 − $42,000 − $350,000 basis | $308,000 |
| Less §121 exclusion (single) | −$250,000 |
| Taxable gain | $58,000 |
| Federal tax at 15% | −$8,700 |
| Net after tax | $349,300 |
Compare the two: $349,300 vs. $312,000. The house is worth about $37,300 more in spendable dollars, even though both are labeled $400K.
Change one input and the answer moves. If the home's basis were $250,000 instead of $350,000, the taxable gain would be $158,000 and the tax would be about $23,700. The house side would drop to about $334,300, and the gap would narrow to about $22,300. If your state also taxes capital gains, it narrows further. If the 401(k) is Roth, the gap flips the other way, because a Roth balance is already after-tax. For more on the house-versus-retirement-account comparison, see House or 401(k) in Your Divorce Settlement? At 7% Mortgage Rates, $600K in Equity Isn't Worth $600K.
Three versions of the same $800K estate
Here is how three structures compare, using the same assumptions.
| Scenario A: Keep house / take 401(k) | Scenario B: Sell house, split 401(k) 50/50 | Scenario C: Keep house, add equalizing payment | |
|---|---|---|---|
| Spouse 1 receives | House ($349,300 after-tax if sold) | $200K 401(k) + half of house proceeds | House + pays $18,650 |
| Spouse 2 receives | 401(k) ($312,000 after-tax) | $200K 401(k) + half of house proceeds | 401(k) + $18,650 |
| Spouse 1 after-tax value | $349,300 | $330,650 | $330,650 |
| Spouse 2 after-tax value | $312,000 | $330,650 | $330,650 |
| Gap | $37,300 | $0 | $0 |
| Who bears house carrying costs? | Spouse 1 | Nobody | Spouse 1 |
Scenario B checks out as follows. Each spouse's $200,000 in 401(k) is worth $156,000 after tax. Each spouse also receives $174,650, half of the $349,300 net. The total is $330,650 each.
Scenario C only works if Spouse 1 can pay. An $18,650 equalizing payment has to come from cash, a loan, or another account. It also assumes Spouse 1 can refinance the $300,000 mortgage in their own name, and that lenders will count their income alone.
The Sevaryn settlement modeler runs this kind of side-by-side for you, so you don't have to build the spreadsheet yourself.
The hidden cost of keeping the house
Scenario A's after-tax figure assumes the house is sold. If Spouse 1 keeps it, they hold an illiquid asset and pay to own it. Use the same rough rules of thumb a buyer would:
- Property tax at 1.1% of $700,000: about $7,700 a year
- Homeowners insurance: about $2,400 a year
- Maintenance at 1% of value: about $7,000 a year
That's roughly $17,100 a year before a single mortgage payment. Over 10 years, that's $171,000 in carrying costs. Those figures are examples, and yours will differ by state, home age, and insurance market.
This is where the NerdWallet editor's argument becomes useful in a divorce. Her question, what does ownership cost compared with investing the same capital, applies to the spouse who is offered the house. The 401(k) spouse holds an asset that can grow and be drawn on flexibly, with taxes due at withdrawal. The house spouse holds an asset that can appreciate but also charges rent to itself. Neither is automatically better. Which one wins depends on the expected appreciation in your market, how long you'd stay, and your other income. If you want the mortgage-rate angle, see House vs. 401(k) in a $650K Divorce Settlement.
The fourth asset most settlements never price: Social Security
At 54 after a 22-year marriage, there's another asset that never appears on the settlement spreadsheet: the divorced-spouse Social Security benefit.
Under current federal rules, you may qualify for a benefit based on your ex-spouse's earnings record if:
- The marriage lasted at least 10 years
- You are currently unmarried
- You are at least 62
- Your own benefit is less than the divorced-spouse amount (up to 50% of your ex's full retirement benefit, when claimed at full retirement age)
It doesn't reduce your ex's benefit, and it isn't divided in the settlement. But it changes how much other wealth you need.
Example. Your ex's full retirement benefit is $3,000 a month, so the divorced-spouse maximum is $1,500. Your own benefit at full retirement age is $1,100. You'd receive your own $1,100 plus a top-up of about $400 a month.
Present value of that $400 top-up, starting at 67 and lasting 20 years, discounted at 3% and ignoring cost-of-living adjustments:
- $400 × 12 = $4,800 a year
- Annuity factor for 20 years at 3%: about 14.877
- Value at age 67: $4,800 × 14.877 ≈ $71,400
- Discounted 13 years back to age 54 (÷ 1.469): about $48,600
So the benefit is worth roughly $48,600 in today's dollars. It isn't something you negotiate. It is something you weigh when deciding how much 401(k) or cash you'd need to trade for. A spouse with a low earnings record and a 22-year marriage may need less retirement savings than one who has no Social Security safety net. We take this further in Splitting a $380,000 401(k) and a $90,000 Pension in Divorce.
Don't plan around a bill that hasn't passed
Social Security is in the news, and you may hear pieces that affect your planning. CNBC reported that Rep. Haley Stevens introduced a bill that would let some workers in physically demanding jobs claim full retirement benefits at age 60. It is a proposal, not law. Even if it advances, it applies to a defined group of workers, and the details would matter. If your ex worked in a physically demanding field, the timing of their claim could change your divorced-spouse benefit, but nothing in this post should be read as counting on that. Model the current rules and treat any change as an upside case, not a base case.
A second CNBC report, on a survey of advisors' clients ahead of the midterms, found clients worried about short- and long-term costs and about whether Social Security and Medicare will be there when they retire. That's a reasonable worry to bring to the negotiation, and it's a reason to run stress cases. What if your benefit is 20% lower than projected? What if home insurance climbs another 30%? A settlement that only works in the base case isn't a safe settlement. This is also why assets that hold up under stress, such as cash reserves or lower-cost housing, can be worth more than a headline number suggests.
The variables that decide your answer
The example above uses one set of inputs. Here is how changing each one shifts the answer.
| Variable | If it goes this way... | ...it shifts the balance toward |
|---|---|---|
| State | Community property state with 50/50 default | Less room to trade assets unevenly |
| State | Equitable distribution state | More room to negotiate a house-for-401(k) swap |
| State income tax | High state tax on withdrawals or gains | Lowers both sides; check which falls more |
| Home basis | Low basis (bought long ago) | Larger taxable gain, weaker house value |
| 401(k) type | Roth instead of traditional | Stronger 401(k) value |
| Income disparity | One spouse has much lower income | Cash flow and liquidity matter more than equity |
| Marriage length | 10+ years | Divorced-spouse Social Security benefit becomes available |
| Mortgage rate | Refinance at 7% vs. assuming a 3% loan | Kept house becomes more expensive to hold |
| Ages | Closer to 59½ | Penalty exposure on outside-QDRO withdrawals shrinks |
The state row matters more than most people expect. See Community Property vs. Equitable Distribution: How Divorce State Law Turns the Same $1M Settlement Into a $175K After-Tax Gap for how the same estate splits differently depending on where you file.
You can model this for your specific situation at Sevaryn, including your state, tax bracket, home basis, and marriage length.
Questions to ask before you sign
- What's the after-tax value of every asset I'm receiving? Convert both sides to the same footing.
- Can I qualify for the mortgage alone? If not, Scenario A or C may not be workable.
- What does it cost each year to hold the house? Include taxes, insurance, and maintenance.
- Is the QDRO drafted correctly, and who pays for it? Errors in these orders are common and costly, and processing takes time. Have your attorney confirm the plan's requirements first.
- Does my Social Security divorced-spouse benefit change how much I need? It doesn't get divided, but it should shape what you ask for.
- What happens in a stress case? Rerun the numbers with lower returns and higher costs.
For a broader checklist, see How to Evaluate Your Spouse's First Settlement Offer.
The bottom line
A $400K house and a $400K 401(k) are two different assets. In this example, after selling costs and tax, the house is worth about $349,300 and the 401(k) about $312,000. That's a $37,300 gap that a 50/50 headline hides, and it can widen, narrow, or reverse depending on your basis, your state, your account type, and what the house costs you to keep. Add a Social Security benefit worth tens of thousands in present value and the "equal" offer has at least four moving parts.
None of this means the first offer is wrong. It means you can't tell until you've run the numbers. Have your attorney handle the legal questions, and run the math on your own situation with Sevaryn before you sign anything.
Sources
- I Edit Mortgage Advice for a Living — and Still Rent — NerdWallet
- Data Centers Are a Potent, Bipartisan Battleground in the Midterms — NerdWallet
- States’ Nonconformity with Federal Measurements Creates “Barrels” of Compliance Costs — Tax Foundation
- New Social Security bill would lower retirement age to 60 for some workers — CNBC Personal Finance
- Affordability concerns loom large for advisors' clients ahead of midterm elections, survey finds — CNBC Personal Finance