A 1099-S affects your taxes by telling the IRS the gross proceeds from your real estate sale, but whether you actually owe anything depends on your cost basis, how long you held the property, whether it was your primary home, and which exclusions apply. The form itself is not a tax bill. It is a report. The number in Box 2 is the full sale price, not your profit, and the IRS gets an identical copy, so the sale needs to appear on your return even when the tax comes out to zero.
What the Form Reports
Form 1099-S covers residential homes, commercial buildings, vacant land, and certain easements. The settlement agent, title company, or closing attorney files it with the IRS and sends you a copy.1Office of the Law Revision Counsel. 26 USC 6045 – Returns of Brokers Box 2 shows gross proceeds, generally the full sale price. Box 6 shows the buyer’s share of prepaid real estate taxes credited at closing, which affects how you handle the property tax deduction for the year of sale but not your capital gain math.
Some sellers never receive a 1099-S at all. If you signed a written certification at closing, under penalties of perjury, that the property was your principal residence and the entire gain qualified for the Section 121 exclusion, the closing agent could skip issuing the form. That option is available when the sale price is $250,000 or less for a single seller or $500,000 or less for a married seller, and only when there was no period of nonqualified use after December 31, 2008.2Internal Revenue Service. Instructions for Form 1099-S (04/2025) Not getting a form does not remove your obligation to check that the gain really was fully excludable.
Finding Your Actual Gain
Subtract your adjusted basis from the gross proceeds to find the gain the IRS taxes. Basis starts as the original purchase price. It goes up for qualifying improvements and certain closing costs, and down for depreciation you claimed.
Capital improvements that add value, extend useful life, or adapt the property to a new use increase basis: an added bedroom, a new roof, central air, a deck, a kitchen remodel. Routine repairs like interior painting, fixing a leak, or replacing broken hardware do not. One wrinkle: if a repair is part of a larger remodeling project, the whole job may qualify as an improvement.3Internal Revenue Service. Publication 523 (2025), Selling Your Home
From your original purchase, title insurance, recording fees, survey fees, transfer taxes, and legal fees for the title search and deed also add to basis.3Internal Revenue Service. Publication 523 (2025), Selling Your Home On the sale side, real estate commissions and other selling expenses reduce your net gain. Keep the receipts. The difference between good records and no records can be thousands of dollars in tax.
Which Tax Rate Hits the Gain
Holding period decides the rate. Property held more than one year gets long-term capital gains rates. Property held one year or less is taxed at ordinary income rates, which top out at 37%.4Internal Revenue Service. Topic No. 409, Capital Gains and Losses
For 2026, the long-term rates are:
- 0% on taxable income up to $49,450 single or $98,900 married filing jointly
- 15% from $49,451 to $545,500 single, or $98,901 to $613,700 married filing jointly
- 20% above $545,500 single or $613,700 married filing jointly
The gain stacks on top of your other income for the year. A large sale can push you into a higher bracket even when your regular paycheck would not.
The 3.8% Net Investment Income Tax
Higher earners face an additional 3.8% surtax on net investment income, including capital gains from property sales. It applies when modified adjusted gross income exceeds $200,000 single or $250,000 married filing jointly.5Internal Revenue Service. Topic No. 559, Net Investment Income Tax Those thresholds are not indexed for inflation. The surtax applies to the lesser of your net investment income or the amount your MAGI exceeds the threshold.
The Primary Residence Exclusion
If the property was your main home, you can exclude up to $250,000 of gain from taxable income, or $500,000 if you’re married filing jointly.6Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence Gain under those limits owes zero federal capital gains tax, no matter what the 1099-S shows.
To get the full exclusion, you must have owned and used the home as your principal residence for at least two of the five years before the sale. The two years do not have to be consecutive. And you cannot have used this exclusion on another home sale in the prior two years.6Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence
Partial Exclusion for Early Sales
Sold before hitting two years? A prorated exclusion may still be available if the sale was driven by a work move, a health issue, or an unforeseen event. A qualifying work move means your new job location is at least 50 miles farther from the home than your prior workplace was. A health move covers getting medical care, caring for a sick family member, or a doctor-recommended relocation. Unforeseen events include destruction or condemnation of the home, divorce or legal separation, becoming eligible for unemployment, and other events recognized in IRS guidance.
The exclusion is prorated by time. Live in the home for one year of the required two, and you can exclude up to half the $250,000 or $500,000 cap.3Internal Revenue Service. Publication 523 (2025), Selling Your Home
What If You Sold at a Loss
Adjusted basis higher than gross proceeds means a capital loss. A loss on the sale of your personal residence is not deductible. The 1099-S does not change that.
A loss on investment or rental property is deductible. Capital losses offset capital gains dollar for dollar. If losses exceed gains, you can deduct up to $3,000 of the excess against ordinary income each year, or $1,500 if married filing separately.7Office of the Law Revision Counsel. 26 USC 1211 – Limitation on Capital Losses Anything left carries forward indefinitely.
Depreciation Recapture on Rentals
Sellers of rental or investment property hit a complication homeowners don’t. If you claimed depreciation while you owned the property, and the IRS expects you to have, whether you actually did or not, the portion of gain attributable to that depreciation is taxed at a maximum rate of 25%, separate from the regular long-term capital gains rate.8Internal Revenue Service. TD 8836 – Unrecaptured Section 1250 Gain
A quick example. You bought a rental for $300,000, claimed $80,000 in depreciation over the years, and sold for $400,000. Adjusted basis is $220,000. Total gain is $180,000. Of that, $80,000 is taxed at up to 25% as depreciation recapture, and the remaining $100,000 is taxed at your long-term capital gains rate. The primary residence exclusion does not apply to rental property unless you converted it from your home and meet specific timing requirements.
Deferring the Tax With a 1031 Exchange
If you’re selling investment or business real property and buying another, a like-kind exchange under Section 1031 defers the whole capital gains tax, depreciation recapture included, by rolling the proceeds into a replacement property.9Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment This only works for real property used in a trade or business, or held for investment. Your primary residence does not qualify. Neither does property held primarily for resale, like a flip.
The deadlines are hard. You have 45 days from transferring the relinquished property to identify the replacement in writing. You have 180 days from that same transfer date, or your tax return due date including extensions, whichever comes first, to close on the replacement.9Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment Miss either and the exchange fails.
You cannot touch the proceeds during the exchange. A qualified intermediary must hold the funds. If the money lands in your account, even briefly, the exchange is disqualified. Engage the intermediary before closing on the sale, not after.
Reporting the Sale on Your Return
Even if no tax is due, a 1099-S generally means you report the transaction. Use Form 8949 to show the purchase and sale dates, gross proceeds, adjusted basis, and resulting gain or loss. Totals flow to Schedule D of Form 1040.10Internal Revenue Service. 2025 Instructions for Form 8949 – Sales and Other Dispositions of Capital Assets
Claiming the primary residence exclusion on a qualifying sale still means reporting on Form 8949 and Schedule D if you received a 1099-S. Enter the gain, then show the exclusion as an adjustment. Tax software handles it automatically. If you’re filing by hand, IRS Publication 523 walks through the worksheet.
Boxes 4 and 5
Box 4 means you received property or services, not just cash, as part of the sale consideration. If it’s checked, determine the fair market value of what you received and include it in your gain calculation. Box 5 indicates a foreign seller, which triggers separate withholding.2Internal Revenue Service. Instructions for Form 1099-S (04/2025)
Foreign Sellers
A foreign person selling U.S. real property has 15% of the gross sale price withheld at closing by the buyer under FIRPTA and remitted to the IRS.11Internal Revenue Service. FIRPTA Withholding You can file a U.S. return to claim a refund when the actual tax owed is less than the amount withheld. If you know in advance the withholding will exceed the tax, apply for a withholding certificate before closing to reduce the amount.
What Happens If You Don’t Report
The IRS receives its own copy of every 1099-S, and matching is automated. If the sale is missing from your return, expect a CP2000 notice proposing additional tax based on the full gross proceeds, with no reduction for basis or exclusion. The IRS treats the entire sale price as profit and puts the burden on you to prove otherwise.
On top of the extra tax, the IRS can assess a 20% accuracy-related penalty on the underpayment if the omission causes a substantial understatement of income tax.12Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments Interest accrues from the original return due date.
Report the sale, claim the exclusions and basis adjustments you’re entitled to, and let the math work. Even a fully excluded gain has to appear on the return when a 1099-S was issued.