# The Capital Gains Trap When Selling the Family Home

By Michele L Albohn (@michelelalbohn) · Published 2026-10-10

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A Knoxville couple who bought their home in the 1990s for $120,000 could sell today for $700,000 — and owe roughly $45,000 in surprise federal tax if one spouse has died and the two-year window to claim the full exclusion has already passed. For long-time East Tennessee owners, the IRS home-sale exclusion is no longer a safety net; it has quietly become a trap.

The mechanism is simple. The home-sale exclusion lets a single filer leave out up to $250,000 of gain, and a married couple filing jointly up to $500,000 ([IRS](https://www.irs.gov/publications/p523)). Most homeowners never get close to those limits. But owners who bought decades ago in a region like East Tennessee — where prices climbed by a **nearly 100% gain over six years in many zip codes** after the pandemic ([ETNR](https://www.etnrealtors.com/assets/pdf/2026+ETNR+State+of+Housing+Report)) — carry gains large enough that a routine sale becomes a taxable event.

And for many of those families, the answer isn't a loan they pay back. A reverse mortgage isn't just a way to access cash — it's a way to preserve the step-up in basis that a lifetime sale would destroy.

The home-sale exclusion lets a single filer leave out up to $250,000 of gain, and a married couple filing jointly up to $500,000 ([IRS](https://www.irs.gov/publications/p523)). For a typical homeowner who bought recently, that coverage is plenty. But your long-time owners are not typical. They bought decades ago, often for a fraction of today's value, in a region where prices have climbed sharply.

East Tennessee home prices rose by a **nearly 100% gain over six years in many zip codes** after the pandemic, according to the East Tennessee REALTORS® 2026 State of Housing Report ([ETNR](https://www.etnrealtors.com/assets/pdf/2026+ETNR+State+of+Housing+Report)). When someone who bought in the 1990s finally sells, the appreciation alone can push them far past the exclusion — and they almost never see it coming.

#### Key Takeaways

-   A home's appreciation can push gain past the $250,000/$500,000 exclusion, creating surprise tax on a sale
-   A surviving spouse who waits more than two years to sell loses the full $500,000 exclusion and falls to the $250,000 single limit
-   A HECM reverse mortgage converts equity to cash without triggering a taxable sale, preserving the step-up in basis for heirs
-   Advisors should confirm the home's cost basis, titling, and the date of a spouse's death before any sale is signed

## A worked example: how the trap shows up

Walk through a realistic case. A couple bought their home in 1995 for $120,000. Over the years they added a kitchen remodel and an addition worth $30,000, giving them a cost basis of $150,000. Today the home is worth $700,000.

Their gain is $550,000 — the $700,000 value minus the $150,000 basis. Against the $500,000 married-joint exclusion, only $50,000 is taxable. Manageable. But change one fact and the whole picture shifts.

![IRS Publication 523 explaining the home sale exclusion](https://convex.voce.com/api/storage/f58c8bf7-90e6-4f59-bf84-2c9085d8d4ac)

The couple's situation mirrors the broader East Tennessee reality. The Knoxville metro's median list price reached $459,900 in May 2026, according to the same ETNR report ([ETNR](https://www.etnrealtors.com/assets/pdf/2026+ETNR+State+of+Housing+Report)), and it has run well above the national median for years. A house bought in the mid-1990s and held has built up exactly the kind of five-figure gain that turns a routine sale into a taxable event.

## When a spouse dies, the exclusion can be cut in half

The husband passes away. Grieving and overwhelmed, his widow waits three years before she feels ready to sell. That extra year is the difference between a manageable tax bill and a large one.

Her gain is still roughly $550,000, or more if the home kept appreciating. But as a single filer, she now faces the $250,000 exclusion instead of the $500,000 one. Her taxable gain jumps to about $300,000. At long-term capital gains rates, that can mean $45,000 or more in federal tax before commissions and closing costs — and it can raise her income enough to push up her Medicare premiums.

Here is the part most families never hear in time. Under IRS rules, a surviving spouse can still claim the full **$500,000 exclusion if the home is sold within two years of the spouse's death**, as long as she hasn't remarried and the ownership and use tests were met at the time of the death ([IRS Publication 554](https://www.irs.gov/publications/p554)).

The rule is precise: you qualify if the sale took place **no more than 2 years after the date of death of your spouse**, you haven't remarried, and you and your spouse met the use test at death. Two years goes quickly when someone is grieving. It is often the window when families are least able to make big decisions — and the window when a trusted advisor matters most.

One related point: depending on how the home was titled, the deceased spouse's share may receive a partial step-up in basis at death, which lowers the gain. A CPA should confirm the actual basis before any decision is made.

## The step-up in basis most sellers give away

There is a second, quieter side to this. When a homeowner keeps the home until death, heirs generally inherit it at its value on the date of death ([IRS Publication 551](https://www.irs.gov/pub/irs-pdf/p551.pdf)). This tax concept is called the step-up in basis.

If our widow lived in the home until her death, and it was worth $800,000 by then, her children's basis would generally become $800,000. If they sold it at that price, there would be little or no capital gains tax. That is one of the most valuable tax breaks in the entire code, and it is lost the moment a home is sold during the owner's lifetime.

If she sells while she is alive, the step-up is gone. The gain is taxed now, and only what remains after tax passes to the next generation. For clients with large built-in gains, selling can be the most expensive tax choice available to them.

## Where a reverse mortgage fits

Clients often sell because they need cash, not because they want to move. They need to cover rising costs, pay for repairs, fund care at home, or simply have breathing room. A **Home Equity Conversion Mortgage (HECM)** — the federally insured reverse mortgage — lets homeowners 62 and older access that equity without selling.

The tax advantages compound. Because a HECM is a loan, the IRS treats its proceeds as **loan advances and not income, so the amount you receive isn't taxable** ([IRS Publication 554](https://www.irs.gov/publications/p554)). And critically, there is no sale at all, which means no capital gains event and no gain to report.

Keeping the home also protects the step-up in basis. Because the home is still owned at death, the heirs inherit it at its then-current value, preserving the built-in gain that a lifetime sale would have realized and taxed.

The practical benefits matter for long-time owners, too:

-   No required monthly mortgage payment, as long as the borrower lives in the home and keeps up with property taxes, insurance, and maintenance.
    
-   The borrower keeps title and can stay in the home for life.
    
-   Heirs keep their options. When the loan comes due, they can sell the home, keep it by paying off the loan, or refinance. Because the loan is non-recourse, they never owe more than the home is worth.
    

For the right client, this turns a forced tax event into a planned one — or avoids it entirely.

**Key Point**

Selling within two years of a spouse's death can preserve the full $500,000 exclusion. That two-year clock is one of the most valuable deadlines in tax planning — and the easiest to miss while grieving.

## Questions to ask before a client lists the home

The decision to sell is rarely purely financial — but the tax consequences follow the numbers, so the right questions uncover the exposure early:

-   **What did you pay for the home, and what improvements have you made?** Do they have the records to document the basis?
    
-   **How is the home titled?** Joint tenancy, tenants in common, or a trust changes whether the deceased spouse's share gets a step-up.
    
-   **If a spouse has died, when?** Are you still inside the two-year window that preserves the $500,000 exclusion?
    
-   **Why are you selling: to move, or because you need the cash?** This is the single most important question.
    
-   **Do you hope to leave the home, or its value, to your children?** If so, selling forfeits the step-up.
    

When the answers point to a large gain and a client who really needs cash more than a move, it is worth comparing a sale with a HECM before anything is signed.

## Let's coordinate

I spent 25 years in Medicaid planning, elder law, and healthcare administration before becoming a mortgage broker. I've seen what happens when families make housing decisions in a hurry, especially after a loss.

CPAs, financial advisors, and elder law attorneys: when a client mentions selling, let's compare notes. The HECM program is federally insured through HUD's Federal Housing Administration ([HUD](http://www.hud.gov/news/hud-no-25-153)), which gives us a shared, verifiable framework to model from. I'll model the reverse mortgage path, and you model the tax and the plan. Together, we can make sure your client sees the full picture before the decision can't be undone.

The numbers don't always say what people expect. But they always say something worth knowing.

_This newsletter is for educational purposes only and is not tax, legal, or financial advice. Examples are hypothetical and for illustration only. Consult a qualified tax professional about your specific situation. A HECM is a loan. Borrowers must be 62 or older, live in the home as their primary residence, and continue to pay property taxes, homeowners insurance, and maintenance. The loan becomes due when the last borrower leaves the home permanently._