Cryptocurrency Tax Reporting: Forms, Cost Basis, and Penalties

Cryptocurrency tax reporting starts with a single question on Form 1040 and expands from there: the IRS treats every digital asset as property, so nearly every time you sell, swap, spend, mine, stake, or get paid in crypto, you have something to report. Capital gains and losses go on Form 8949 and Schedule D. Ordinary income from mining, staking, airdrops, and crypto compensation flows onto your 1040 at fair market value on the day you received it. And starting with 2025 transactions, custodial brokers file a new Form 1099-DA that puts your gross proceeds directly in front of the IRS, with cost basis reporting following for transactions on or after January 1, 2026.¹

The Digital Asset Question You Can’t Skip

Form 1040 asks near the top whether you received, sold, exchanged, or otherwise disposed of any digital asset during the tax year. Answering “No” when the answer is “Yes” can be treated as a misstatement on a federal return. If you did anything beyond holding digital assets in a wallet you already owned, the answer is almost certainly “Yes.”²

The reason the question exists is the underlying classification. IRS Notice 2014-21 established that digital assets are property for federal tax purposes. Every time you dispose of that property, the IRS wants to know whether you made or lost money on it, calculated as the difference between what you paid for the asset (your cost basis) and its fair market value at the moment you got rid of it.²

Which Transactions Have to Be Reported

Reportable events fall into two families: those that produce a capital gain or loss, and those that produce ordinary income.

Capital Gains Events

Three types of transactions create a capital gain or loss:

Selling digital assets for U.S. dollars or other fiat currency.
Swapping one digital asset for another.
Using digital assets to pay for goods or services.

In each case, you subtract your cost basis from the fair market value at the time of the transaction. Positive result, gain. Negative result, loss.²

Ordinary Income Events

Several common activities produce ordinary income, taxed at your regular federal rate the moment you receive the assets:

Digital assets received as payment for services, whether you’re a W-2 employee or a freelancer, count as gross income at fair market value on the date of receipt.
New tokens earned through mining are income the moment they enter your wallet, valued at the market price on that day.
Staking rewards and interest-bearing account payouts follow the same logic as mining income.
Airdrops following a hard fork are ordinary income at fair market value on the date you gain control over the tokens.³

Each of these events also sets your cost basis in the newly received assets. Mine a token worth $500 on the day it hits your wallet, and you report $500 of ordinary income; your basis in that token is $500, and any later gain or loss is measured from there.

If your mining or staking activity rises to a trade or business, the income is also subject to self-employment tax on Schedule SE. The combined rate is 15.3%: 12.4% for Social Security on net earnings up to $184,500 in 2026, and 2.9% for Medicare on all net earnings.⁴⁵ Casual mining on a personal computer likely doesn’t qualify as a business; running dedicated hardware with the intent to profit almost certainly does.

Wrapping Sits in a Gray Area

Wrapping a token (converting ETH to WETH, for example) has not been definitively classified. Notice 2024-57 exempts brokers from filing Form 1099-DA for wrapping and unwrapping until Treasury issues further guidance. That exemption covers reporting, not necessarily taxation. Track these transactions and be prepared to report them if the IRS ultimately treats them as taxable exchanges.²

How Gains Are Taxed

The rate on a capital gain depends on how long you held the asset before disposing of it.

Short-Term Versus Long-Term

Assets held for one year or less produce short-term capital gains, taxed at your ordinary income rate. For 2026, ordinary rates range from 10% to 37%, with the 37% bracket beginning at $640,600 for single filers and $768,700 for married couples filing jointly.⁶

Assets held more than one year qualify for long-term rates of 0%, 15%, or 20%. For 2026, a single filer pays 0% on long-term gains up to $49,450 of taxable income, 15% between $49,450 and $545,500, and 20% above that. Married couples filing jointly get the 0% rate up to $98,900 and don’t hit 20% until income exceeds $613,700.⁷

The 3.8% Net Investment Income Tax

High earners face an additional 3.8% tax on net investment income, which includes crypto gains. The surtax kicks in when modified adjusted gross income exceeds $200,000 for single filers or $250,000 for joint filers. You pay 3.8% on the lesser of your net investment income or the amount by which your income exceeds those thresholds. For a taxpayer with substantial gains, this can push the effective long-term rate to 23.8%.⁸

NFTs Taxed as Collectibles

Certain NFTs may be taxed at a higher 28% long-term capital gains rate if the underlying asset qualifies as a collectible. Under IRS Notice 2023-27, the agency uses a “look-through” approach: if the right or asset associated with an NFT would be a collectible on its own (artwork, a rare gem, an antique), the NFT inherits that classification. An NFT representing digital artwork could face the 28% rate; one representing a concert ticket likely would not.⁹

Gas Fees

Transaction fees, including gas on networks like Ethereum, affect your tax math in two directions. When acquiring an asset, gas fees add to your cost basis, reducing your taxable gain when you sell. When disposing of an asset, gas fees reduce the amount realized, which has the same tax-lowering effect. Fees paid to move assets between your own wallets do not count as transaction costs for basis purposes.¹⁰

Cost Basis Methods

Your cost basis is the total amount you paid to acquire a digital asset, including transaction fees. The IRS recognizes two methods for determining which units you sold.

FIFO

First In, First Out is the IRS default. If you don’t specify which units you’re selling at the time of the transaction, the IRS treats the earliest-purchased units as sold first. In a rising market, FIFO tends to produce the largest taxable gain because your oldest, often cheapest units are counted as sold.

Specific Identification

Specific identification lets you pick which units to sell. That flexibility supports strategies like selling highest-cost units first to minimize gains, or choosing lots with long-term holding periods to qualify for lower rates. The requirements depend on where the assets are held.¹⁰

For assets held in an unhosted wallet, you must identify the specific units being sold in your books and records no later than the date and time of the sale, and maintain records proving those units were the ones removed. Fail to document this properly and you default back to FIFO.

For assets held with a broker or exchange, starting January 1, 2026, you can direct the broker to sell specific units using identifiers the broker has designated (such as purchase date and price). You can also set up a standing order to apply a particular identification method automatically. If a broker offers only one method, that method becomes your standing order by default and you can’t override it.¹⁰

The Forms You File

Form 8949 and Schedule D

Every individual sale, swap, or disposal goes on Form 8949, listing the asset description, date acquired, date sold, proceeds, cost basis, and gain or loss. Short-term and long-term transactions sit in separate sections. Form 8949 totals then flow into Schedule D, which reports your net capital gain or loss for the year.¹¹

Form 1099-DA From Brokers

Starting with transactions in 2025, custodial brokers (exchanges, hosted wallet providers, and crypto kiosks) must report gross proceeds to the IRS on Form 1099-DA. For transactions on or after January 1, 2026, brokers must also report cost basis for covered securities. This aligns crypto reporting more closely with the Form 1099-B regime for stock brokerages.¹

These rules do not reach decentralized or non-custodial platforms. Trade through a decentralized exchange or self-custodial wallet and no broker is reporting your transactions. The full recordkeeping burden falls on you, and the IRS still expects accurate reporting.¹

Foreign Account Reporting

If you hold digital assets on a foreign exchange, FBAR (FinCEN Form 114) reporting may or may not apply. Under current FinCEN guidance, a foreign account holding only virtual currency is not reportable on the FBAR. If that same account also holds other reportable assets, such as fiat currency, the account may trigger FBAR requirements.¹²

Form 8938 (FATCA) may apply separately if you hold specified foreign financial assets above certain thresholds. For U.S.-based single filers, the trigger is more than $50,000 on the last day of the tax year or more than $75,000 at any point during the year. Married couples filing jointly have thresholds of $100,000 and $150,000. Taxpayers living abroad get higher thresholds.¹³

Records to Keep and For How Long

The IRS generally has three years from your filing date to assess additional tax. That extends to six years if you fail to report more than 25% of your gross income, and there’s no time limit for fraud or unfiled returns. For digital assets, keep records establishing cost basis for as long as you hold the asset, plus at least six years after you file the return reporting its disposition. Given how easily crypto income can be undercounted across multiple wallets and exchanges, the six-year window is the realistic planning horizon.¹⁴

Filing, Extensions, and Penalties

Form 8949 and Schedule D attach to your standard Form 1040. Electronic filing software handles the flow automatically and typically flags inconsistencies between your figures and any 1099-DA data the IRS already has. If you rely on a crypto tax tool to generate Form 8949, verify the import against your own records before filing. These tools are only as good as the transaction data feeding them.

For paper filers, send the return via certified mail to the IRS service center for your region. The postmark date controls, not the delivery date. Missing the filing deadline triggers a failure-to-file penalty of 5% of unpaid tax per month, up to 25%.¹⁵

Form 4868 gives you an automatic six-month extension to file, but not to pay. If you owe tax on crypto gains and don’t pay by the original due date, interest accrues and a failure-to-pay penalty of 0.5% of the unpaid balance per month can apply, up to 25%.¹⁶ The IRS recommends paying as much as you can with the extension request to limit interest charges.¹⁷

Accuracy-related penalties add another 20% of any underpayment if the IRS finds a substantial understatement or negligent disregard of the rules. This penalty stacks on top of the tax and interest, not in place of them.¹⁸

What Isn’t Deductible the Way You’d Expect

Two common assumptions about crypto losses collide with the tax code.

First, lost or stolen crypto is usually not deductible. For personal-use digital assets, theft and casualty losses have been deductible only when attributable to a federally declared disaster since the Tax Cuts and Jobs Act took effect in 2018. A hack of your personal wallet doesn’t qualify, and that restriction remains in effect through at least the 2025 tax year. If the theft or fraud involved crypto held as an investment, a different provision may allow a deduction, but you’ll need to establish that the loss resulted from conduct classified as theft under state law and that you have no reasonable prospect of recovery. Simply losing access to a wallet or forgetting a private key does not count. The IRS states plainly that “the simple disappearance of money or property isn’t a theft.”¹⁹

Second, the wash sale rule currently does not apply to digital assets. That rule, which disallows a stock loss if you repurchase substantially identical securities within 30 days, covers only stocks and certain other securities under Section 1091. Crypto investors can sell at a loss and immediately repurchase the same asset to lock in the deduction. Net capital losses that exceed gains can offset up to $3,000 of ordinary income per year, with the remainder carrying forward. Proposals to extend the wash sale rule to digital assets have been floated but not enacted.

State Taxes Sit on Top

Federal reporting is only part of the picture. Most states tax capital gains as ordinary income, and rates range from zero in states with no income tax to over 13% in the highest-tax states. A handful of states offer preferential treatment for long-term capital gains or allow partial deductions. Check your state’s rules before assuming the federal calculation tells the whole story; the combined federal and state rate on a large crypto gain can approach 40% or more for high earners in high-tax states.

1
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2
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17
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18
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19
Internal Revenue Service. Publication 547, Casualties, Disasters, and Thefts