Capital gains, simply.

What capital gains actually means

When you sell something for more than you paid for it, the difference is called a capital gain. The government usually wants a share of that gain as tax.

This applies to stocks, art, gold, and yes — your home. If you bought your house for $300,000 and sold it for $700,000, that's a $400,000 gain. In a different context, you'd owe tax on most of it.

But homes get special treatment. And that special treatment is where most sellers leave money on the table — not because they pay too much tax, but because they don't realize they're allowed to pay none at all.

The big exemption

If the home you're selling has been your primary residence — meaning you actually lived there — for at least two of the last five years, you can exclude a large chunk of your gain from taxes entirely.

These limits have been the same since 1997. Congress hasn't adjusted them for inflation. In Atlanta, where many intown homeowners have been in place for ten or fifteen years, those caps are doing real work.

What can reduce your gain even further

Your gain isn't just the sale price minus what you paid. The IRS lets you add the cost of capital improvements to your original purchase price. That bigger number is called your cost basis, and it lowers your gain.

Capital improvements are things that add real value to the home or extend its useful life — not regular repairs. Examples:

• A new roof
• A finished basement, addition, or sunroom
• A kitchen or bath renovation
• New HVAC or windows
• A pool, deck, or new fencing
• Landscaping that materially changes the property

Things that don't count: repainting, replacing carpet, fixing broken appliances, routine maintenance. Those are repairs, not improvements.

What this means for you right now: if you've been a homeowner for any length of time, you almost certainly have receipts somewhere — for that 2015 kitchen redo, or the new roof three years ago. Find them. Save them. They reduce your tax bill at sale time, but only if you can document them.

The two-of-five rule, explained

The exemption requires you to have owned the home and lived in it for at least two years out of the five-year period ending on the date of sale. The two years don't have to be consecutive.

This matters most for people who've rented out their home, lived elsewhere temporarily, or are selling a property they once lived in but have since converted to an investment. If you fall in any of those categories, the math gets more complicated. A good accountant can run it for you in an hour.

One more thing to know

If your gain exceeds the exemption — say a single seller has $400,000 of gain, putting them $150,000 over the cap — only the excess is taxable. Currently the long-term capital gains rate runs 0%, 15%, or 20% depending on your income.

And there's another quieter tax — the Net Investment Income Tax, an additional 3.8% on higher earners — that can apply to the excess as well. It's worth knowing about, but for most home sellers it's a footnote, not a headline.

What to do, in order

1. Gather records. Pull together receipts, invoices, and contracts for every significant improvement you've made to the home.
2. Know your numbers. Original purchase price, closing costs at purchase, total cost of improvements, expected sale price.
3. Talk to your accountant before listing. Not after closing — before. They can model your tax outcome and identify anything that should be done differently.
4. Keep the records for three years after filing. Even if the IRS never asks, you'll have them if they do.

A note: This is an explainer, not tax advice. Tax law changes, individual situations differ, and the cost of getting it wrong can be five figures or more. Talk to a CPA or tax attorney about your specific situation before making big decisions. If you'd like a recommendation, I can point you to one of the accountants my clients have trusted.