Cryptocurrency tax reporting and enforcement: the property classification under Notice 2014-21, the Form 1099-DA broker reporting starting 2025, the Form 8949 gain/loss mechanics, and the IRS enforcement escalation through John Doe summonses and compliance letters

Cryptocurrency taxation is straightforward in principle and complex in practice. The principle: every cryptocurrency transaction is potentially taxable, because the IRS treats crypto as property. The complexity: tracking cost basis across hundreds or thousands of transactions on multiple exchanges, accounting for forks, airdrops, staking rewards, DeFi yields, and NFT transactions, and navigating reporting requirements that have been expanding rapidly.

The enforcement landscape has changed substantially since the early days of crypto, when the IRS was largely blind to digital asset transactions. The agency now receives transaction data directly from exchanges through John Doe summonses and, starting with tax year 2025, through mandatory broker reporting on Form 1099-DA. Compliance letters have been sent to hundreds of thousands of crypto holders. Criminal prosecutions for willful evasion are increasing. The days of treating crypto as invisible to the IRS are over.

The foundational rule: crypto is property

IRS Notice 2014-21 established the foundational classification: virtual currency is treated as property for federal tax purposes. It is not treated as currency, which means the foreign currency gain/loss rules do not apply. As property, cryptocurrency follows the same capital gain/loss framework as stocks, bonds, and real estate.

Every disposition of cryptocurrency is a taxable event:

Selling cryptocurrency for fiat currency (dollars) produces a capital gain or loss.

Exchanging one cryptocurrency for another (swapping Bitcoin for Ethereum, for example) produces a capital gain or loss on the crypto disposed of.

Using cryptocurrency to purchase goods or services produces a capital gain or loss on the crypto spent.

Gifting cryptocurrency is not a taxable event for the donor (though gift tax may apply for large gifts); the recipient takes the donor's basis.

Receiving cryptocurrency as payment for services is ordinary income, valued at the fair market value of the crypto on the date of receipt.

The capital gain or loss is calculated as the difference between the amount realized (the fair market value of what was received) and the adjusted basis (what was paid for the crypto, plus any fees).

Short-term capital gains (crypto held one year or less) are taxed at ordinary income rates. Long-term capital gains (crypto held more than one year) are taxed at the preferential long-term capital gains rates (0%, 15%, or 20% depending on income).

The Form 1099-DA broker reporting

Beginning with tax year 2025, cryptocurrency brokers (centralized exchanges and certain other platforms) are required to issue Form 1099-DA (Digital Asset Proceeds from Broker Transactions) to taxpayers and the IRS, reporting gross proceeds from digital asset sales and exchanges.

The broker reporting requirement was enacted as part of the Infrastructure Investment and Jobs Act of 2021, which expanded the definition of "broker" under IRC §6045 to include persons who effectuate digital asset transfers on behalf of others.

Form 1099-DA reports gross proceeds (not gains or losses; the broker may not have cost basis information for all transactions). For taxpayers who acquired crypto on one exchange and transferred it to another before selling, the selling exchange may not know the original cost basis, and the 1099-DA may report only the proceeds.

The practical impact: for tax year 2025 returns (filed in 2026), many crypto holders will receive 1099-DAs for the first time. The IRS will have independent verification of the transaction data, which dramatically increases the audit risk for unreported or underreported crypto income.

The Form 8949 reporting

Capital gains and losses from cryptocurrency transactions are reported on Form 8949 (Sales and Other Dispositions of Capital Assets) and summarized on Schedule D. Each transaction must be reported individually: the asset description, date acquired, date sold, proceeds, cost basis, and gain or loss.

For active crypto traders with hundreds or thousands of transactions, the Form 8949 reporting can be voluminous. Crypto tax software (CoinTracker, TaxBit, Koinly, and similar services) aggregates transaction data from exchanges via API connections and generates the Form 8949 entries.

Cost basis methods: the IRS allows specific identification (identifying which specific lot of crypto is being sold, to optimize the gain/loss), FIFO (first in, first out), and other methods, provided the method is applied consistently. Specific identification generally produces the most favorable tax result (by allowing the taxpayer to sell the highest-basis lots first, minimizing gains), but it requires detailed lot-level tracking.

Staking rewards and mining income

Revenue Ruling 2023-14 established that staking rewards are taxable as ordinary income at the time the taxpayer gains dominion and control over the rewards (typically, when the rewards are credited to the taxpayer's account). The fair market value on the date of receipt is the taxable amount and becomes the cost basis for future gain/loss calculations.

Mining income follows the same principle: crypto received from mining is ordinary income at the fair market value on the date of receipt.

For DeFi yield farming, liquidity provision, and other complex DeFi activities, the IRS has not issued comprehensive guidance, but the general principles apply: income is recognized when the taxpayer receives it, and the fair market value on the date of receipt is the taxable amount.

Forks and airdrops

Revenue Ruling 2019-24 addressed hard forks and airdrops: when a taxpayer receives new cryptocurrency through a hard fork followed by an airdrop, the new cryptocurrency is ordinary income at the fair market value on the date of receipt (when the taxpayer has dominion and control). The fair market value becomes the cost basis.

If a hard fork occurs but the taxpayer does not receive the new cryptocurrency (because the exchange does not support the fork), no income is recognized until the taxpayer actually receives and can dispose of the new tokens.

What does not apply: §1031 and wash sale rules

Two provisions that apply to other types of property do not currently apply to cryptocurrency:

§1031 like-kind exchanges. Before the TCJA (for tax years before 2018), some taxpayers argued that crypto-to-crypto swaps qualified as like-kind exchanges under §1031, deferring the gain. The TCJA restricted §1031 to real property only, eliminating any possibility of like-kind exchange treatment for cryptocurrency.

Wash sale rules. The wash sale rule (§1091) prevents taxpayers from claiming a loss on a security sold and repurchased within 30 days. Cryptocurrency is classified as property, not a security, so the wash sale rule does not currently apply. A crypto holder can sell at a loss, immediately repurchase the same crypto, and claim the loss, which is a tax-loss harvesting strategy unavailable for stocks.

Legislative proposals to extend the wash sale rule to digital assets have been introduced in multiple sessions of Congress but have not been enacted as of 2026. If the wash sale rule is extended to crypto, the tax-loss harvesting strategy would be eliminated.

The IRS enforcement escalation

The IRS has steadily escalated its cryptocurrency enforcement:

John Doe summonses. The IRS has obtained court-authorized John Doe summonses compelling major exchanges (Coinbase in 2016, Kraken in 2021, Circle in subsequent years) to produce records of customers who transacted above certain thresholds. These summonses give the IRS transaction data directly from the exchanges, identifying taxpayers who may have underreported crypto income.

Compliance letters. The IRS has sent hundreds of thousands of compliance letters (Letters 6173, 6174, and 6174-A) to cryptocurrency holders identified through exchange data. The letters range from informational ("we believe you have or had cryptocurrency") to assertive ("you may not have properly reported your transactions"), requiring a response.

Criminal prosecutions. The IRS Criminal Investigation division has increased its focus on cryptocurrency tax evasion. Prosecutions have targeted willful failure to report substantial crypto income, offshore crypto holdings concealed from the IRS, and tax fraud schemes involving digital assets.

The annual tax return question. Since 2019, the IRS has included a question on the front page of Form 1040 asking whether the taxpayer received, sold, exchanged, or otherwise disposed of any digital assets during the year. Answering "no" when the answer is "yes" is a false statement on a federal tax return.

Coordination with other tax provisions

Cryptocurrency tax issues interact with several other Halstonberg tax-debt provisions:

IRS audit defense applies to crypto audits, which are increasingly common. The documentation (exchange records, wallet addresses, transaction histories) is the audit defense.

IRS penalty abatement and reasonable cause arguments apply to crypto-related penalties. Taxpayers who failed to report crypto income due to genuine confusion about the reporting requirements (particularly in the early years) may have reasonable cause arguments.

FBAR reporting may apply to cryptocurrency held on foreign exchanges (the applicability of FBAR to foreign crypto accounts is an evolving legal question with significant penalty exposure).

The IRS debt forgiveness framework applies to crypto-related tax liabilities: OIC, installment agreements, and CNC status are available for crypto tax debts the same as for any other tax debts.

Practical guidance

For cryptocurrency holders:

Report all cryptocurrency transactions. Every sale, swap, use, and receipt of crypto is a taxable event. The 1099-DA reporting starting with tax year 2025 means the IRS has independent verification of your transactions; unreported crypto income is an audit invitation.

Track your cost basis meticulously. Use crypto tax software to aggregate transaction data across all exchanges and wallets. Specific identification of lots (selling the highest-basis lots first) optimizes your tax result but requires detailed tracking.

Answer the Form 1040 digital asset question accurately. A false answer is a false statement on a tax return, which can support fraud penalties and criminal prosecution.

If you have unreported crypto income from prior years, consider filing amended returns (Form 1040-X) or consulting with a tax professional about voluntary disclosure options. The IRS's escalating enforcement makes proactive correction substantially safer than waiting for an audit or compliance letter.

Take advantage of tax-loss harvesting while the wash sale rule does not apply to crypto. Selling at a loss and immediately repurchasing is currently permitted; this may change if Congress extends the wash sale rule to digital assets.

For staking rewards, mining income, and airdrop receipts, report the income at the fair market value on the date of receipt. This income is ordinary (not capital gains) and is subject to self-employment tax if the activity rises to the level of a trade or business.

Cryptocurrency taxation is an area where the rules are established but the enforcement infrastructure has recently caught up. The Form 1099-DA reporting, the John Doe summonses, the compliance letters, and the criminal prosecution pipeline together mean that crypto income is now visible to the IRS in ways it was not before 2020. Proactive compliance is substantially less expensive and less risky than reactive correction after an enforcement action.