Stocks are not automatically considered income. Owning shares, even shares that have doubled in value, does not create taxable income by itself. The IRS treats stock as income only when a specific event turns the investment into money or pay: selling shares at a profit, receiving dividends, or getting shares as compensation for work. Each of those events has its own rate and its own reporting rules.
Holding Stock Does Not Create Income
If you buy a share for $40 and it climbs to $100, that $60 of growth is an unrealized gain. The IRS does not tax it. You can watch your portfolio rise for years without owing a dollar of federal income tax on the appreciation, because the gain isn’t real for tax purposes until you sell. This is why a buy-and-hold strategy defers tax indefinitely: the shares are a capital asset, and the growth stays inside the account as equity rather than reportable earnings.
Selling Stock at a Profit
The moment you sell for more than you paid, the profit becomes a realized capital gain and counts as income for that tax year. You calculate the gain by subtracting your cost basis—what you paid, including commissions—from the sale price. Your brokerage reports the sale to you and to the IRS on Form 1099-B, and you report the gain on your return.
How much tax you owe depends on how long you held the shares.
Short-Term vs. Long-Term Rates
Stock held for one year or less produces a short-term capital gain, taxed at your ordinary income rate, which runs from 10% to 37% in 2026.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 20262Internal Revenue Service. Topic No. 409, Capital Gains and Losses3Office of the Law Revision Counsel. 26 U.S. Code Chapter 1 Subchapter P Part III
For single filers in 2026, the 0% long-term rate applies to taxable income up to $49,450, the 15% rate covers $49,451 through $545,500, and the 20% rate begins above $545,500. For married couples filing jointly, the 0% bracket runs up to $98,900, the 15% bracket runs to $613,700, and 20% applies above that.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 The 0% bracket is easy to miss: many lower-income investors owe nothing federal on long-term stock profits.
The one-year clock is strict. Sell on the anniversary date and you’re still short-term; you need at least one year and one day.
Dividends
Dividends are income even if you never sell a share. When a company pays out part of its profits to shareholders, the payment counts as income in the year it’s received. Your brokerage reports the total on Form 1099-DIV.4Internal Revenue Service. About Form 1099-DIV, Dividends and Distributions
Ordinary vs. Qualified Dividends
Ordinary dividends are taxed at your regular income tax rate, 10% to 37% in 2026. Qualified dividends are taxed at the same 0%, 15%, or 20% long-term capital gains rates.2Internal Revenue Service. Topic No. 409, Capital Gains and Losses To qualify, you generally need to hold the stock for at least 61 days during the 121-day period beginning 60 days before the ex-dividend date. Most dividends from U.S. corporations, and some from foreign corporations, can qualify. Your 1099-DIV shows the qualified portion in Box 1b, so you don’t have to split it yourself.
Reinvested Dividends Still Count
If your brokerage reinvests dividends to buy more shares automatically, you still owe tax on the dividend in the year it was paid.5Internal Revenue Service. Stocks (Options, Splits, Traders) 2 The cash never landed in your bank account, but the IRS treats it as though it did. The upside: the reinvested amount becomes the cost basis for the new shares, so it isn’t taxed a second time when you eventually sell them.
Stock Received as Pay
Stock you receive for work is treated as ordinary compensation, the same as cash wages. Under federal tax law, the fair market value of shares transferred to you in exchange for services is included in your gross income once the shares vest—the point at which the company can no longer take them back.6Office of the Law Revision Counsel. 26 U.S. Code 83 Federal income tax, Social Security, and Medicare are withheld, and the amount shows up on your W-2.
Say 100 restricted stock units vest when the share price is $50. That’s $5,000 of ordinary income for the year. If you later sell those shares at $70, the additional $20 per share is a separate capital gain, short-term or long-term depending on how long you held after vesting.
Stock Options
Non-qualified stock options (NSOs) produce ordinary compensation income at exercise, measured by the spread between the exercise price and the market price that day. Incentive stock options (ISOs) don’t trigger regular income tax at exercise, though the spread can affect the alternative minimum tax. Hold ISO shares at least one year after exercise and two years after the grant date, and any profit at sale is a long-term capital gain rather than ordinary income.
The Section 83(b) Election
If you receive restricted stock (not RSUs) that vests over time, you can choose to pay income tax on the full value at grant instead of at each vesting date. This is the Section 83(b) election. Its point is to convert future appreciation into capital gain rather than ordinary income. You must file the election with the IRS within 30 days of receiving the stock, and there is no extension.7Internal Revenue Service. Form 15620 Section 83(b) Election Instructions The risk is that if the stock later drops, you’ve already paid tax on value that disappeared, and the tax isn’t refundable.
Gifted and Inherited Stock
Receiving stock as a gift or an inheritance is not income at the moment you receive it. The tax question shows up later, when you sell, and it turns on your cost basis.
Gifts
Stock given to you by a living person generally carries over the donor’s original cost basis. If the giver paid $20 per share and you sell at $50, you owe tax on the $30 gain even though the shares cost you nothing.8Internal Revenue Service. Publication 551 – Basis of Assets If the market value at the time of the gift was below the donor’s basis, a split rule applies: use the market value at the gift date to figure a loss, the donor’s basis to figure a gain, and if the sale price falls between the two, there is neither gain nor loss.
Inheritance
p>Inherited stock gets a stepped-up basis. Your basis resets to the fair market value on the date of death.9Office of the Law Revision Counsel. 26 U.S. Code 1014 If a parent paid $10,000 for shares worth $50,000 at death, your basis is $50,000. Sell soon after at $50,000 and you owe no capital gains tax. Only appreciation after the date of death produces a taxable gain for you.
Losses Offset Gains
Selling stock at a loss reduces the income you owe tax on. Short-term losses first offset short-term gains, and long-term losses offset long-term gains. Any net loss left over can offset up to $3,000 of your other ordinary income per year, $1,500 if married filing separately.10Office of the Law Revision Counsel. 26 U.S. Code 1211 Losses beyond the annual cap carry forward to future years indefinitely.
One trap to know about. You cannot sell at a loss and immediately buy the same stock back to lock in the deduction. Under the wash sale rule, if you buy substantially identical shares within 30 days before or after the loss sale, the IRS disallows the deduction for that year.11Office of the Law Revision Counsel. 26 U.S. Code 1091 The disallowed loss isn’t gone forever; it gets added to the basis of the replacement shares and reduces the taxable gain when you eventually sell those. But the current-year deduction is lost.
The Extra 3.8% Tax for Higher Earners
Investment income can trigger an additional 3.8% net investment income tax (NIIT) on top of the regular rates. It applies when your modified adjusted gross income exceeds:12Internal Revenue Service. Topic No. 559, Net Investment Income Tax
- $200,000 for single or head of household filers
- $250,000 for married filing jointly
- $125,000 for married filing separately
The 3.8% applies to the smaller of your net investment income or the amount your MAGI exceeds the threshold. A single large stock sale can push you over the line for one year even if your usual income sits well below it.
Paying the Tax on a Big Sale
A large stock sale often produces a tax bill that paycheck withholding won’t cover. To avoid an underpayment penalty, you may need to make quarterly estimated tax payments. The IRS generally expects them if you’ll owe at least $1,000 after withholding and credits, and your withholding will cover less than 90% of the current year’s tax or 100% of last year’s (110% if your prior-year adjusted gross income exceeded $150,000).13Internal Revenue Service. Form 1040-ES
If the sale happens late in the year, the annualized income installment method lets you match your estimated payments to the quarter the income actually arrived, using Form 2210 with Schedule AI. A simpler option some investors use is asking their employer to boost paycheck withholding for the rest of the year.
State Taxes
Federal rules are only half the picture. Most states tax capital gains and dividends at the same rate as ordinary income. State rates run from 0% in states with no income tax to over 13% in the highest-tax states. A few states offer partial exclusions or preferential rates on long-term gains, but most do not. Check your state’s rules before estimating what a sale will actually cost, because the combined federal and state hit can be considerably higher than the federal rate on its own.