1099-DA rollout could inflate U.S. crypto tax bills if cost basis is missing
The IRS's new 1099-DA will in many cases list only sale proceeds, requiring taxpayers to supply the missing cost basis or risk higher capital-gains liabilities. Large U.S. platforms including Coinbase, Robinhood and Binance.US are expected to issue these forms for the 2026 filing cycle, prompting tax preparers to anticipate a marked increase in reconciliation work.
When a purchase price cannot be matched to a reported sale, IRS systems and automated processes commonly default the cost basis to zero, which can materially inflate an investor's taxable gain and cash tax liability in illustrative cases. The form covers a wide range of dispositions — swaps to other tokens, sales for fiat, broker fee payments and trades for goods or services — though transactions below certain stablecoin thresholds remain excluded from reporting.
Operationally, the biggest obstacle is fragmented records: transfers across wallets and exchanges, closures of platforms, lost keys and historical scams all break the trail needed to reconstruct basis automatically. Specialist reconciliation vendors such as CoinTracker and OnChain Accounting report rising demand as investors try to aggregate dispersed buys, transfers and receipts into a defensible basis history.
The 1099-DA requirement sits inside broader policy momentum: the Joint Committee on Taxation estimates roughly $28 billion in additional federal revenue over ten years from improved reporting. At the same time, international reporting frameworks and data-exchange standards are accelerating, enabling tax authorities to combine custodial disclosures with on-chain analytics and third-party identifiers to match previously opaque positions.
This global convergence shortens the window for remediation: structured reporting and cross-border sharing are making it easier for authorities to spot mismatches between platform data and blockchain activity, which in turn raises the stakes for taxpayers who lack archival purchase records. Some jurisdictions are also experimenting with administrative penalties and capped remedies to push compliance, a dynamic that may influence enforcement choices in the U.S.
Practically, taxpayers should now inventory wallets, export exchange histories with timestamps, and preserve any off-chain invoices or receipts that show acquisition prices. Where trails are irreparably broken, paid reconciliation services and professional tax advice are likely to be the only practical ways to reconstruct basis and to contest default IRS assessments.
Exchanges emphasize they can report cost basis only when both acquisition and disposition occurred on the same platform, leaving cross-platform histories uncovered. Smaller platforms and noncompliant operators may struggle to meet onboarding, KYC and data-architecture requirements, which favors larger operators and compliance vendors with the resources to perform complex matching.
For the upcoming filing season, exchanges must furnish forms by the IRS deadline and preparers expect a testing year as systems and workflows mature. The policy enhances visibility of taxable events recorded on blockchains but transfers the evidentiary burden onto holders; without good records many retail investors will overpay in the near term.
Advisors recommend immediate organization of documentation and, for complex or long histories, engaging specialists who can run automated reconciliation across ledgers and exchanges. The short-term consequence will be increased work for preparers, higher demand for crypto-aware tax software and likely fee inflation for reconciliation services.
Ultimately, the 1099-DA will improve the IRS's ability to detect taxable crypto activity but will not fully close cross-platform basis gaps. Combined with international reporting initiatives and enhanced on-chain forensic tools, however, the change signals a sustained tightening of the enforcement environment that taxpayers and service providers must reckon with.
- Form deadline: Feb 17, 2026
- Projected revenue from improved reporting: $28 billion over 10 years
- Stablecoin reporting threshold: $10,000
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