The Tax Conversation Most Sellers Have Too Late
The Tax Conversation Most Sellers Have Too Late
Part 2 of a 5-part series on protecting what you keep
I'm not a CPA, and nothing here is tax advice. But I've watched enough sellers get blindsided at the closing table to know that the conversation almost always happens in the wrong order.
The pattern is consistent: someone sells a home they've owned for twenty-plus years, feels good about the price, and then discovers that a meaningful share of the gain may be taxable.
By then, the decisions that could have changed the number may already be behind them.
Here's what to understand well enough to have an intelligent conversation with your CPA before you list, not after.
The Number That Gets Taxed
You are not taxed simply on what the house sells for.
You're generally taxed on gain, which starts with this calculation:
Amount realized
Sale price minus selling costs
Minus adjusted basis
What you paid, plus qualifying improvements and other adjustments
Equals gain
That means two homes selling for the same price can have very different taxable gains depending on their owners' basis.
The Exclusion
Under Section 121, a qualifying homeowner may be able to exclude up to:
$250,000 of gain for a single filer
$500,000 for certain married couples filing jointly
Generally, you must have owned and lived in the home as your principal residence for at least two of the five years before the sale and generally not have used the exclusion on another home during the previous two years. For the $500,000 exclusion, additional requirements apply, including that both spouses generally meet the use test.
That sounds generous until you look at what has happened to home values over decades.
For long-term homeowners in appreciating markets, the exclusion may not cover the entire gain.
Basis Is Where the Money Is
This is where something unglamorous becomes financially important: your records.
Consider a couple who bought for $400,000 and over twenty years put roughly $150,000 into the home — a kitchen, roof, windows, bathroom remodel, HVAC, and hardscaping.
They sell for $1,350,000 after selling costs.
With documentation:
Basis = $550,000
Gain = $800,000
After a $500,000 exclusion, $300,000 may remain taxable.
Without documentation:
Basis = $400,000
Gain = $950,000
After the exclusion, $450,000 may remain taxable.
Same house. Same sale. Same improvements.
The difference is the documentation.
The IRS generally includes qualifying capital improvements in adjusted basis.
Every improvement receipt you saved may represent gain that doesn't have to be taxed.
If your records are thin, start reconstructing them now. Look for contractor records, permits, bank or credit-card statements, and other documentation that can help establish qualifying improvements.
What Counts and What Doesn't
Generally adds to basis:
Room additions
Kitchen and bathroom remodels
New roof
Replacement windows
New HVAC systems
Electrical or plumbing upgrades
Permanent landscaping and hardscape
New driveway
Pool
Insulation
New water heater
Generally does not:
Routine painting
Fixing a leak
Replacing a broken pane
Servicing the furnace
Cleaning gutters
Patching drywall
The line can be more complicated than a simple list, so your CPA should make the final determination.
But the practical advice is simple:
Keep everything.
It costs little to save a receipt, and there's no way to recover one after the fact.
When to Have This Conversation
Six to twelve months before you list. Ideally longer.
Bring your CPA three things:
Your original purchase documents
Whatever improvement records you have
A realistic estimate of your potential sale price
Ask them to model the outcome.
What you're buying with that meeting is options — timing considerations, the value of reconstructing missing records, and a clearer understanding of what your sale could actually mean after taxes.
Those options require runway.
None of them are available once you're sitting at the closing table.
Sellers who have this conversation early can make different decisions.
Sellers who have it late just receive the number.
Federal capital gains is one layer. For California homeowners, there's another conversation that can matter significantly — especially for homeowners considering a move later in life.
Next in this series: Prop 19 and the Math Most Downsizers Miss → https://jensengrouprealty.com/post/prop-19-and-the-math-most-downsizers-miss
Related from the previous series: The Prep Work That Actually Changes What You Net — the maintenance file that feeds directly into your basis calculation →https://jensengrouprealty.com/post/the-prep-work-that-actually-changes-what-you-net
I'm a real estate professional, not a CPA or tax attorney. This is general information, not tax advice. Figures are current as of publication and subject to change. Please consult a qualified tax professional about your specific situation before making decisions.
