The short-term capital gains tax on property is the federal tax you owe when you sell real estate you’ve held for one year or less, and it’s calculated by stacking your profit on top of your other income and taxing the total at ordinary income rates that can reach 37%. There is no preferential rate for short-term gains the way there is for long-term ones. If your income is high enough, an additional 3.8% net investment income tax applies on top. The gain itself is the net sale price minus your adjusted basis, so what you spent improving the property and selling it directly reduces what you owe.
The One-Year Holding Period
Federal law defines a short-term capital gain as profit from selling a capital asset held for one year or less.1Office of the Law Revision Counsel. 26 USC 1222 – Other Terms Relating to Capital Gains and Losses Hold the property for more than one year, and the gain qualifies for long-term rates, which top out at 20% for most taxpayers instead of 37%.
The clock starts the day after you acquire the property, not the closing date itself. Close on a purchase January 1, and your holding period begins January 2. To cross into long-term territory, you’d need to sell on or after January 2 of the following year. Selling on January 1 keeps you one day short.
This is where flippers most often get caught. A rehab that takes ten months and then sits on the market for a couple more can easily close inside the one-year window. If the timeline is close, even a brief delay in listing can be the difference between a 24% rate and a 15% rate on the same profit.
Inherited Property Is Always Long-Term
If you inherit real estate, federal law treats it as held for more than one year no matter how quickly you sell.2Office of the Law Revision Counsel. 26 USC 1223 – Holding Period of Property You could sell the week after the prior owner’s death and still get long-term rates. The basis is also stepped up to fair market value at the date of death, so the taxable gain is often small or zero. Inherited property will never trigger short-term capital gains tax.
Calculating the Taxable Gain
The gain the IRS taxes is not simply the sale price minus what you paid. You get credit for money spent improving the property, and you subtract selling costs from the proceeds.
Start With Your Adjusted Basis
Your basis generally begins as the purchase price. You then add capital improvements and certain acquisition costs to arrive at your adjusted basis. Improvements include a new roof, a kitchen remodel, an added deck, or upgraded electrical systems.3Internal Revenue Service. Publication 523 – Selling Your Home Routine maintenance and repairs, like patching drywall or replacing a faucet, do not count.
Settlement fees from the original purchase also increase your basis: title insurance, transfer taxes, recording fees, survey fees, and legal fees related to the purchase.4Internal Revenue Service. Publication 551 – Basis of Assets Mortgage-related costs like points and loan origination fees generally do not add to basis.
Determine Your Net Sale Price
Take the gross sale price and subtract selling expenses: real estate commissions, advertising, legal fees, and any seller-paid points or loan charges.3Internal Revenue Service. Publication 523 – Selling Your Home Sell a property for $500,000 and pay $30,000 in commissions and $5,000 in other closing costs, and your net sale price is $465,000.
The Final Calculation
Subtract your adjusted basis from the net sale price. If you bought for $350,000, spent $25,000 on qualifying improvements, and sold for a net of $465,000, your taxable gain is $90,000. Every receipt matters here. A forgotten $8,000 bathroom renovation that you can document reduces your taxable gain by $8,000, which at a 24% rate saves nearly $2,000 in federal tax alone. Keep records of every improvement from the day you close on the purchase.
2026 Federal Tax Rates on Short-Term Gains
Short-term capital gains receive no special rate. The IRS pools the gain with your wages, interest, and other earnings for the year, then runs the total through the progressive federal brackets.5Internal Revenue Service. Topic No. 409, Capital Gains and Losses For 2026, those brackets are:
- 10%: Up to $12,400 (single) or $24,800 (married filing jointly)
- 12%: $12,401–$50,400 (single) or $24,801–$100,800 (joint)
- 22%: $50,401–$105,700 (single) or $100,801–$211,400 (joint)
- 24%: $105,701–$201,775 (single) or $211,401–$403,550 (joint)
- 32%: $201,776–$256,225 (single) or $403,551–$512,450 (joint)
- 35%: $256,226–$640,600 (single) or $512,451–$768,700 (joint)
- 37%: Over $640,600 (single) or over $768,700 (joint)
A property gain can push you into a higher bracket. A single filer earning $80,000 in salary who realizes a $90,000 short-term gain on a flip has combined income of $170,000, so part of that gain is taxed at 24% instead of the 22% they would have paid on salary alone. Only income above each threshold gets taxed at the higher rate, but the bracket jump still adds real money to the bill.
The 3.8% Net Investment Income Tax
Higher earners face an additional 3.8% surtax on net investment income, which includes capital gains from property sales.6Office of the Law Revision Counsel. 26 USC 1411 – Imposition of Tax The tax kicks in when modified adjusted gross income exceeds:
- $200,000 for single or head of household
- $250,000 for married filing jointly
- $125,000 for married filing separately
The 3.8% applies to the lesser of your net investment income or the amount by which your income exceeds the threshold.7Internal Revenue Service. Net Investment Income Tax These thresholds are not adjusted for inflation, so they catch more taxpayers every year. A married couple with $200,000 in combined salary who realizes an $80,000 short-term gain now has $280,000 in modified AGI. They owe 3.8% on $30,000, adding $1,140 to the bill on top of ordinary income tax on the gain.
Partial Exclusion if the Property Was Your Primary Home
The standard rule for selling a primary residence lets you exclude up to $250,000 in gain, or $500,000 if married filing jointly, if you owned and lived in the home for at least two of the five years before the sale.8Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence Sell within two years and you normally don’t qualify, so the gain is taxed at short-term rates if you held the property one year or less.
There’s an exception. If you sell early because of a job relocation, a health condition, or an unforeseen circumstance like a natural disaster, divorce, or death, you may qualify for a partial exclusion.3Internal Revenue Service. Publication 523 – Selling Your Home The partial exclusion is prorated based on the fraction of the two-year requirement you met. Live in the home for one year and qualify, and you could exclude up to half of the full amount: up to $125,000 for a single filer. That often eliminates the short-term tax entirely on smaller gains.
State Taxes Add to the Total
Federal tax is only part of the bill. Most states impose their own income tax on short-term capital gains, and the rates vary widely. Eight states have no individual income tax at all: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, and Wyoming. Everywhere else, your short-term property gain typically gets taxed at your state’s ordinary income rate, which can add roughly 2% to over 13% depending on the state and your income level. Factor state tax into your profit projection before you commit to a quick sale.
The Dealer Classification Can Change Everything
Not every property sale qualifies for capital gains treatment at all. Federal law excludes “property held by the taxpayer primarily for sale to customers in the ordinary course of his trade or business” from the definition of a capital asset.9Office of the Law Revision Counsel. 26 USC 1221 – Capital Asset Defined If the IRS classifies you as a real estate dealer rather than an investor, your profit is treated as business income. Ordinary income rates still apply, but you also owe self-employment tax, roughly another 15.3% on the first $176,100 of net self-employment income (2026 threshold) and 2.9% above that.
The IRS looks at how frequently you buy and sell, whether you treat properties like inventory, the extent of improvements you make before resale, and how much of your time you devote to the activity. Someone who flips one property as a side project is more likely to be treated as an investor. Someone flipping six houses a year as their primary income looks like a dealer. There is no bright-line test, and the classification can be applied on a property-by-property basis. If you flip regularly, this is worth sorting out with a tax professional before you list anything.
Estimated Tax Payments and Avoiding Penalties
A large property gain creates a tax liability that your employer’s payroll withholding won’t cover. If you expect to owe $1,000 or more when you file, the IRS expects you to make estimated tax payments during the year rather than wait until April.10Internal Revenue Service. Estimated Taxes The quarterly deadlines are:
- Income from January 1 to March 31: payment due April 15
- Income from April 1 to May 31: payment due June 15
- Income from June 1 to August 31: payment due September 15
- Income from September 1 to December 31: payment due January 15 of the following year
If a due date falls on a weekend or holiday, the deadline moves to the next business day.11Internal Revenue Service. Estimated Tax You can pay using Form 1040-ES or electronically through IRS Direct Pay.
Missing these payments triggers an underpayment penalty, which functions like interest on what you should have paid. You can avoid the penalty if you owe less than $1,000 after withholding and credits, or if you paid at least 90% of your current-year tax, or 100% of last year’s tax (whichever is less). If your prior-year adjusted gross income exceeded $150,000, the safe harbor rises to 110% of last year’s tax.12Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty For a flip that closes in July, you’d generally want to make an estimated payment by September 15 covering the tax on that gain.
Reporting the Sale on Your Return
When you sell real property, the closing agent reports gross proceeds to the IRS on Form 1099-S. You’ll receive a copy showing the sale price and closing date. The IRS already has this information, so your return needs to match.
You report the sale details on Form 8949: the acquisition date, sale date, gross proceeds, and your adjusted basis for each property sold.13Internal Revenue Service. About Form 8949, Sales and Other Dispositions of Capital Assets Totals from Form 8949 carry over to Schedule D of your Form 1040, where all your capital gains and losses for the year are aggregated.14Internal Revenue Service. Form 8949 – Sales and Other Dispositions of Capital Assets Both forms are filed with your annual return, due April 15 (or the next business day if that falls on a weekend or holiday).
The most common mistake is overstating the basis or leaving off selling expenses, both of which change the reported gain. If the gain on your return doesn’t match what the IRS expects from the 1099-S proceeds, expect a notice. Getting the adjusted basis right from the start, with documentation for every improvement and closing cost, is the single best way to avoid that.
Deferring the Gain With a 1031 Exchange
If the property was held for investment or used in a trade or business, a like-kind exchange under Section 1031 lets you defer the capital gains tax by rolling the proceeds into a replacement property of equal or greater value. Personal residences and dealer inventory do not qualify. There is no statutory minimum holding period, but the IRS scrutinizes properties held for very short periods to determine whether they were genuinely held for investment rather than for quick resale. If you plan to use a 1031 exchange on a property you’ve owned for less than a year, expect the classification to draw closer attention, and consult a tax advisor before closing.