The 1099-DA Form Explained: Crypto Tax Compliance for US and Spain in 2026

1. Legislative origin: the IIJA and Section 6045

The evolution of digital asset reporting in the United States has its roots in a fundamental problem: for over a decade, the Treasury Department and the IRS had virtually no visibility into a market that relied almost exclusively on voluntary self-reporting by taxpayers. Compliance rates for crypto transactions were significantly lower than for traditional financial instruments, creating a widening gap between actual economic activity and reported taxable income.

The Infrastructure Investment and Jobs Act (IIJA), signed into law on November 15, 2021, addressed this gap directly. The legislation amended Section 6045 of the Internal Revenue Code to expand the definition of "broker" to include any person who, for consideration, is responsible for regularly providing any service effectuating transfers of digital assets on behalf of another person. This change was projected as a significant source of federal revenue to finance infrastructure projects, on the assumption that more rigorous reporting would increase voluntary compliance and facilitate targeted audits.

Following an extensive public comment period, the Treasury issued the final regulations in July 2024 (T.D. 10000), establishing the operational framework for the Form 1099-DA that taxpayers began receiving in February 2026 for tax year 2025.

The scope of what constitutes a "digital asset" under the current regulations is deliberately broad: any digital representation of value recorded on a cryptographically secured distributed ledger or similar technology. This covers conventional cryptocurrencies like Bitcoin and Ethereum, stablecoins, non-fungible tokens (NFTs), and tokenized real-world assets.

2. Who must report: the evolving definition of "broker"

The classification of entities obligated to report is as critical as the definition of the assets themselves. The IRS has adopted a standard based on "ability to know" and control over transactions. Under the regulations in effect for 2026, the following entities qualify as brokers and must issue Form 1099-DA:

• Custodial digital asset exchange operators (centralized exchanges such as Coinbase, Kraken, and Gemini)
• Custodial wallet providers (platforms that hold private keys on behalf of users)
• Digital asset kiosk operators (crypto ATMs)
• Certain digital asset payment processors (PDAPs) (where annual transactions exceed $600)

However, the regulatory landscape of 2026 reflects a significant adjustment from the original ambitions of the IIJA. The regulations initially proposed for decentralized finance (DeFi) brokers and non-custodial wallets were repealed in 2025 following changes in administration and Congress. This limits the current reporting obligation to intermediaries that actually take custody of client assets — a pragmatic recognition that the technological architecture of truly decentralized protocols makes broker-style reporting impractical.

This distinction is particularly important for users of DeFi protocols. If you swap tokens through a decentralized exchange like Uniswap or provide liquidity on Aave, no broker is filing a 1099-DA for those transactions. However — and this point cannot be emphasized enough — the absence of third-party reporting does not eliminate your tax obligation. You remain responsible for reporting all taxable events on your annual return. The IRS's enforcement strategy for DeFi transactions relies on blockchain analytics, information obtained from centralized on-ramps and off-ramps, and the expanding network of international data exchange agreements. For a deeper understanding of how privacy intersects with tax regulation in the crypto space, see our dedicated analysis.

3. The Form 1099-DA: box-by-box analysis

The Form 1099-DA, titled "Digital Asset Proceeds From Broker Transactions," is the document that brokers must send to both the IRS and the taxpayer to report dispositions of digital assets during the tax year. Precision in interpreting each box is vital to avoid discrepancies that could trigger IRS notices or audit flags. Each box provides specific information that must be reconciled with the taxpayer's personal records and carried forward to Form 8949.

Box 1a — Digital Asset Code: Uses the standard code from the Digital Token Identifier Foundation (DTIF) to identify the asset. This is a standardized identifier, similar to a CUSIP for traditional securities, that ensures consistent identification across platforms.

Box 1b — Digital Asset Name: The full name or standard abbreviation of the token or coin sold or disposed of.

Box 1c — Number of Units: The exact quantity of units disposed of in the transaction. This is reported with sufficient decimal precision to capture fractional token transactions.

Box 1d — Date of Acquisition: The date on which the asset was originally obtained. For tax year 2025, this box frequently appears blank for "non-covered" assets or assets transferred from external platforms where the broker lacks acquisition data.

Box 1e — Date of Sale: The date on which the disposition occurred.

Box 1f — Proceeds: The gross amount received from the sale, exchange, or other disposition, generally reduced by transaction costs and commissions. This is the figure the IRS will match against your return.

Box 1g — Cost or Other Basis: The adjusted acquisition price. For tax year 2025, reporting this figure is optional for brokers, which creates a significant risk: if the broker leaves this box blank and the taxpayer does not provide their own cost basis information, the IRS may treat the entire amount in Box 1f as pure gain.

Box 9 — Non-Covered Asset: This box is checked if the asset was acquired before January 1, 2026, or if it was transferred to the platform from a source the broker does not control. A checked Box 9 signals that the taxpayer bears full responsibility for determining and substantiating the cost basis.

4. The Code Y dilemma and Form 8949 reconciliation

A critical technical issue identified in the 2026 tax season is the predominant use of "Code Y" in the Form 8949 category box. Code Y indicates that the broker cannot determine whether the transaction is short-term or long-term because it does not know the holding period. This situation is common for assets transferred from private wallets, foreign exchanges, or platforms that did not previously track acquisition dates.

The impact on the taxpayer is significant: a Form 1099-DA with Code Y does not serve the function of calculating net gain or loss. The taxpayer must use their own records to determine whether the asset was held for more than one year (long-term, eligible for preferential capital gains rates) or less than one year (short-term, taxed as ordinary income). The transaction must then be reported on the correct section of Form 8949, using Box H for short-term or Box K for long-term, as specified in the 2026 instructions.

The reconciliation process with Form 8949 requires taxpayers to:

1. Match each 1099-DA transaction to their personal records, confirming the acquisition date and cost basis.
2. Classify each transaction as short-term or long-term based on the actual holding period.
3. Report transactions with Code Y separately from transactions where the broker has provided complete information.
4. Carry the totals forward to Schedule D of Form 1040.

For taxpayers with hundreds or thousands of transactions across multiple platforms, this reconciliation is a substantial undertaking. The absence of broker-reported cost basis for 2025 transactions means that crypto-specific tax software or professional assistance is effectively mandatory for anyone with more than a handful of dispositions. For a broader overview of how crypto gains are taxed in the US and other jurisdictions, see our comprehensive guide.

5. The account-by-account tracking mandate

Beginning January 1, 2025, the IRS formally prohibited the use of the "universal method" for aggregating cost basis across multiple wallets and accounts. Historically, many investors treated all their holdings of a specific cryptocurrency as a single pool, applying methods like FIFO (First-In, First-Out) globally across all platforms and wallets. The final regulations now require an account-by-account approach, where the cost basis of units within one brokerage platform or specific wallet is independent of the basis of identical units held elsewhere.

This change has profound practical implications. Suppose you hold 5 BTC across three locations: 2 BTC on Coinbase purchased at $30,000, 2 BTC on Kraken purchased at $45,000, and 1 BTC in a hardware wallet purchased at $20,000. Under the old universal method, you could apply FIFO globally and choose to sell units with the highest basis first (HIFO) to minimize taxes, regardless of which platform held those specific units. Under the account-by-account mandate, the cost basis calculation for a sale on Coinbase can only reference the units held on Coinbase.

The Rev. Proc. 2024-28 safe harbor

To mitigate the complexity of this transition, the IRS issued Revenue Procedure 2024-28, which provides a "safe harbor" for taxpayers. This procedure allows taxpayers to allocate their unused cost basis to digital assets held in specific wallets or accounts as of January 1, 2025. The allocation must be documented and must be consistent with the reality of the holdings on that date.

The safe harbor effectively gave taxpayers a one-time opportunity to organize their cost basis records before the account-by-account mandate took full effect. Those who completed this allocation can demonstrate to the IRS that their cost basis for each account is accurately tracked from a defined starting point. Those who did not make this formal allocation — or who cannot demonstrate the physical location of their assets and the associated basis as of January 1, 2025 — risk having the IRS reject their claimed basis in future audits.

The practical lesson is clear: if you have not yet completed your Rev. Proc. 2024-28 allocation, the window for doing so is not formally closed, but the longer you wait, the more difficult it becomes to reconstruct accurate records. Every transfer, swap, and disposition since January 1, 2025 must be tracked within the context of the specific account where it occurred.

6. Transition relief: Notices 2024-56, 2024-57, and 2025-33

Given the operational magnitude of implementing a new global reporting system, the IRS has provided several periods of relief and transitional guidance through three key notices.

Notice 2024-56: good faith penalty relief

Notice 2024-56 establishes that the IRS will not impose penalties for failure to file or incorrect filing of Forms 1099-DA for tax year 2025 transactions, provided the broker demonstrates a good faith effort to comply. This relief is critical because many intermediaries are expected to face technical difficulties processing the massive volume of transactional data for the first time. For taxpayers, this means that form delivery may be delayed or may contain initial errors, reinforcing the necessity of maintaining accurate personal records as the primary source of truth.

Notice 2024-57: temporarily excluded transactions

Notice 2024-57 identifies certain transactions that, due to their technical complexity, are temporarily excluded from the 1099-DA reporting obligation until additional guidance is issued. These transactions include:

• Token wrapping and unwrapping operations (e.g., wrapping ETH to WETH)
• Liquidity provider transactions in decentralized exchange pools
• Staking rewards, although these remain reportable as ordinary income on other forms such as 1099-MISC or directly on Form 1040
• Digital asset lending transactions and notional principal contract transactions

It is essential to understand that exclusion from broker reporting does not exempt the taxpayer from their obligation to declare any income or gain derived from these activities on their annual return. The reporting burden simply shifts entirely to the taxpayer in the absence of third-party information reporting. This is particularly relevant for active DeFi participants whose transaction volume in wrapping, liquidity provision, and lending may represent the majority of their on-chain activity. Understanding the hidden risks of token approvals in these DeFi interactions is equally important for protecting your assets.

Notice 2025-33: backup withholding extension

The 24% backup withholding system applies when a taxpayer fails to provide a valid Taxpayer Identification Number (TIN) to their broker. Notice 2025-33 extended the relief from backup withholding liability for brokers through the end of 2026, allowing a more gradual implementation phase. Beginning in 2027, backup withholding compliance will be strictly mandatory for all digital asset sales on custodial platforms.

For taxpayers, this means that ensuring your TIN (typically your Social Security Number) is correctly on file with every exchange and custodial platform you use is not merely an administrative task — it is the difference between receiving your full proceeds and having 24% automatically withheld and remitted to the IRS. While backup withholding is not a tax itself (the withheld amount is credited against your tax liability when you file), it creates significant cash flow issues and adds complexity to the filing process.

7. International interaction: crypto tax compliance in Spain

For US citizens residing in Spain, the 2026 tax season presents a uniquely complex challenge due to the convergence of IRS obligations with those of the Agencia Estatal de Administración Tributaria (AEAT). Spain has implemented a rigorous transparency framework that includes the Modelo 721, an informational declaration on virtual assets held abroad, alongside comprehensive IRPF reporting requirements and wealth tax obligations.

Modelo 721: foreign-held virtual assets

Modelo 721 is mandatory for Spanish tax residents who hold cryptocurrencies on platforms located outside Spanish territory (such as Coinbase, Binance, or Kraken) whose combined value exceeds 50,000 euros as of December 31. The filing period runs from January 1 to March 31 of the following year.

It is imperative to note that Modelo 721 is purely informational and does not generate a tax liability by itself. However, the penalties for non-filing are disproportionately severe, with minimum fines of 10,000 euros. For a US citizen in Spain, this means coordinating the information contained in their US Form 1099-DA with the detailed reporting required by the AEAT, which includes the asset name, number of units, market value in euros, and identification of the custodial platform.

The Modelo 721 obligation extends beyond centralized exchanges. The AEAT considers crypto assets in self-custody wallets to be "abroad" if the user accesses or manages them through interfaces or delegated custody services outside Spanish territory. This interpretation means that even assets technically residing on a public blockchain with no physical location must be reported if managed through non-Spanish infrastructure.

IRPF capital gains taxation: mandatory FIFO

Unlike the United States, where taxpayers may use specific identification of lots (including HIFO — Highest-In, First-Out) to optimize their tax position, Spanish regulations strictly require the FIFO method (First-In, First-Out) for calculating capital gains and losses under IRPF (Modelo 100). Gains are integrated into the savings tax base and taxed at progressive rates:

For a US citizen, this disparity in methods (specific identification in the US versus mandatory FIFO in Spain) can generate discrepancies in the gain amount reported to each country for the same transaction. Consider selling 1 BTC purchased in two lots: 0.5 BTC at $20,000 and 0.5 BTC at $60,000. Under US rules, you might identify the higher-cost lot to minimize your US tax. Under Spanish FIFO rules, you must use the $20,000 lot first, resulting in a higher gain reported to Spain. The primary tool for mitigating double taxation is the Foreign Tax Credit (Form 1116) on the US return, which allows crediting taxes paid in Spain against the US tax obligation. For a comprehensive look at crypto taxation across jurisdictions, see our MiCA and DAC8 guide which covers the broader European regulatory context.

Impuesto sobre el Patrimonio (Wealth Tax)

Digital assets must also be included in Spain's Wealth Tax declaration (Modelo 714) if the taxpayer's net wealth exceeds regional thresholds. In the Comunidad de Madrid, a 99% to 100% rebate exists, which drastically reduces the impact of this tax — although the obligation to file the informational declaration persists if gross wealth exceeds certain limits (generally 2 million euros).

However, for residents of other autonomous communities such as Catalonia or Valencia, the Wealth Tax burden can range from 0.2% to 3.75% of the market value of assets as of December 31. This represents a meaningful annual cost for crypto holders with significant portfolios, effectively creating a tax on unrealized gains that has no equivalent in the US federal system.

The Ley Beckham regime and digital assets

The Special Regime for Displaced Workers, popularly known as the "Ley Beckham," offers significant tax advantages for foreigners who move to Spain for employment reasons. Under this regime, the individual is treated as a non-resident for tax purposes, meaning they only pay Spanish tax on Spanish-source income at a flat rate of 24% on income up to 600,000 euros.

The critical question for crypto investors is: are cryptocurrency gains considered Spanish-source income?

The Dirección General de Tributos (DGT) has issued guidance (including binding consultation V1069-19) that is fundamental to this determination. In general terms, gains derived from the sale of cryptocurrencies are not considered Spanish-source income if the entity providing custody services (the exchange) is not located in Spain and does not operate through a permanent establishment in the country.

Therefore, a US citizen under the Ley Beckham who uses US-based platforms could be exempt from paying Spanish tax on crypto capital gains, paying only to the IRS. However, if the taxpayer maintains self-custody (hardware or software wallets in their physical possession in Spain), there is a risk that the AEAT considers the gains as obtained in Spanish territory and subjects them to taxation. This distinction underscores the importance of custody structure planning before and during residency in Spain.

8. The future of electronic reporting

In March 2026, the IRS issued proposed regulations (REG-105064-25) seeking to modernize the delivery of broker account statements for digital assets. These rules would allow brokers to provide Form 1099-DA exclusively in electronic format, without the obligation to offer a paper option to clients who do not consent.

A notable provision of these proposals is that brokers could terminate their business relationship with clients who refuse to accept electronic delivery — a measure reflecting the intrinsically digital nature of the sector and aimed at reducing the administrative costs of printing and mailing. These rules are expected to take effect for returns due from January 1, 2027, consolidating a "digital-by-default" compliance model.

Electronic-only delivery means that taxpayers must maintain organized digital filing systems. Setting up secure email addresses, enabling platform notifications, and regularly downloading account statements become essential practices for tax compliance.

9. Strategic recommendations for 2026 and beyond

The full implementation of Form 1099-DA in 2026 has transformed the digital asset ecosystem from a low-oversight environment to one of institutionalized transparency. The transition period of 2025–2026, while offering penalty relief, shifts the primary burden of proof to the taxpayer, who must be able to reconstruct their cost basis on an account-by-account basis to avoid being taxed on the entirety of their sales proceeds.

For investors, especially those with international exposure in Spain, the recommended strategy includes:

1. Audit your records. Reconcile every Form 1099-DA received with platform account statements and crypto tax software to verify Box 1f (proceeds) and determine the cost basis for Box 1g if it appears blank. Pay particular attention to transactions marked with Code Y, which require you to independently determine the holding period and classify the gain as short-term or long-term.

2. Comply with Rev. Proc. 2024-28. Ensure that the cost basis allocation made as of January 1, 2025 is properly documented to support future dispositions under the account-by-account tracking mandate. If you have not completed this allocation, reconstruct your holdings as of that date using exchange records, blockchain explorers, and wallet transaction histories.

3. Coordinate transatlantic reporting. For residents in Spain, ensure that the data reported in Modelo 721 (due by March 31) is consistent with what is reported to the IRS on Form 1040 and its schedules (FBAR and Form 8938), taking into account the mandatory use of FIFO in Spain versus the flexibility of method selection in the US.

4. Monitor the regulatory horizon. Stay alert to the evolution of DeFi reporting regulations and the new electronic delivery rules. The compliance framework continues to adjust to the technological reality of digital assets. The IRS has signaled that DeFi-specific reporting requirements may be revisited, and the expansion of international information exchange agreements under the OECD's Crypto-Asset Reporting Framework (CARF) will further narrow the space for unreported transactions.

5. Review your custody structure. For US citizens under the Ley Beckham regime in Spain, the location of your custody arrangement directly impacts your tax obligation. Using US-based custodial platforms may exempt your gains from Spanish taxation, while self-custody within Spain may expose you to IRPF liability. Consult with a cross-border tax advisor before making changes to how and where you hold your assets.

6. Prepare for backup withholding. Verify that your TIN is correctly on file with every custodial platform you use. Beginning in 2027, the 24% backup withholding will be strictly enforced, and resolving withholding issues after the fact is significantly more burdensome than preventing them.

10. Conclusion: the end of fiscal ambiguity

The era of fiscal ambiguity in cryptocurrency is over. The 1099-DA regime, combined with account-by-account tracking, the Rev. Proc. 2024-28 safe harbor, and the expanding international information exchange network, has created a compliance infrastructure that mirrors what has existed for traditional securities for decades. The difference is that the crypto ecosystem required a compressed timeline to achieve the same level of transparency — and taxpayers are bearing the cost of that compression in the form of heightened documentation requirements and complex reconciliation processes.

For US citizens in Spain, the challenge is compounded by the requirement to satisfy two distinct and sometimes contradictory tax systems simultaneously. The FIFO mandate in Spain versus specific identification in the US, the Modelo 721 informational requirement, the Wealth Tax (with its dramatic regional variations), and the Ley Beckham exception for non-Spanish-source income all create a matrix of obligations that demands professional guidance and meticulous record-keeping.

Rigor in documentation and a thorough understanding of automatic information exchange mechanisms are now the only effective safeguards against the risk of penalties and tax overpayment in an increasingly interconnected global regulatory environment.