Form 1099-DA and the Zero-Basis Risk: What Crypto Investors Need to Know for Tax Year 2026

Form 1099-DA represents the IRS's first systematic effort to capture digital asset transaction activity at scale. Effective for transactions in 2025, the new information return requires all US-regulated digital asset brokers to report gross proceeds from sales, exchanges, and disposals of crypto, stablecoins, and NFTs directly to both the taxpayer and the Internal Revenue Service. Brokers were required to deliver these forms by February 17, 2026—well ahead of the April 15, 2026 tax return deadline—ensuring the IRS has independent documentation of trading activity before investors file.

The fundamental problem is structural: Form 1099-DA captures gross proceeds only. It does not report the investor's original cost basis, acquisition dates, or holding periods. This creates an immediate discrepancy between what the IRS sees (total sale proceeds) and what the taxpayer actually owes in tax (net capital gain or loss). According to tax professionals fielding client inquiries in early 2026, this gap is already triggering confusion and compliance risk. As one crypto tax expert describes it, "your Form 1099-DA is wrong or incomplete"—not because brokers are deliberately misreporting, but because the form itself does not capture the data needed to calculate true tax liability. The IRS will match reported 1099-DA proceeds against tax returns, and any discrepancy—whether legitimate or not—will generate automated notices or trigger manual audit selection.

Cost basis reporting is being phased in incrementally. For 2025 transactions, most brokers are delivering 1099-DA forms without cost basis detail. Beginning with 2026 transactions, brokers are expected to populate cost basis fields, though implementation remains uneven across platforms and exchanges. This phase-in creates a one-year window of heightened audit exposure for active traders, as the IRS will have transaction data but investors will bear the burden of proving their actual cost basis through broker statements, personal records, and supplemental documentation.

In practice, investors who sold any digital assets on a US centralized exchange during 2025 will receive a 1099-DA and must reconcile it against their actual tax position before filing. The forms are arriving late, numbers are incomplete, and the IRS already possesses copies. This creates a compressed timeline and places the reconciliation burden on taxpayers and their advisors. The new Form 1099-DA does not replace Form 8949 (Sales of Capital Assets) in the filing process; rather, it becomes a secondary compliance document that the IRS will use to validate reported gains and losses. Investors failing to address discrepancies proactively face elevated audit risk in the 2026 tax season.