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Could Your 1099-DA Trigger an IRS Review?

Could Your 1099-DA Trigger an IRS Review?

Most IRS notices are generated through automated data matching, not by an agent reading your return. Form 1099-DA introduces a new reporting layer into that system: for the first time, crypto brokers report your digital asset sales directly to the IRS.

What 1099-DA Reports

Brokers report gross proceeds for digital asset sales made on or after January 1, 2025. For assets acquired on or after January 1, 2026, they also report cost basis, but only when the asset was bought and sold in the same account.

Anything transferred in from another wallet or exchange is generally treated as noncovered. The form shows what you sold it for, but not what you paid.

How Matching Works

When an exchange issues a 1099-DA, a copy is sent to the IRS.

The IRS system compares:

  • Proceeds reported on the 1099-DA against
  • Gains and income reported on your return

This comparison runs through the IRS Automated Underreporter (AUR) program. If the discrepancy exceeds tolerance thresholds, the return may be flagged and a CP2000 notice proposing additional tax can follow. At this stage, no one has reviewed your records. The process is entirely automated.

Why Crypto Is Structurally Different

Traditional brokerages maintain internal cost basis records.

Crypto ecosystems span:

  • Wallets
  • Exchanges
  • DeFi protocols
  • Bridges
  • Staking systems

A single transfer from an exchange to a self-custody wallet breaks the exchange’s view of your cost basis. Since 2025, basis must also be tracked wallet by wallet rather than across your whole portfolio.

Without full reconstruction of acquisition history, mismatches become more likely.

What Creates Audit Risk

  • Large divergence between reported proceeds and gains
  • Missing cost basis, which can lead the IRS to treat the full sale amount as taxable gain
  • Inconsistent transaction logic across wallets and platforms
  • Unexplained reporting discrepancies

The risk is structural. It comes from how activity is spread across platforms, not from wrongdoing.

The Audit-Defensible Approach

DeFiTax reconciles centralized and decentralized activity using blockchain data.

The result:

  • Deterministic cost basis calculations
  • Reproducible reporting
  • Alignment between 1099-DA proceeds and your filed return

Audit-ready means your figures can be explained, not just formatted.

Bottom Line

1099-DA marks a formal shift in digital asset reporting.

If you traded crypto, do not assume exchange data reflects the full picture. Ensure your return reflects your complete transaction history.

Accuracy is now the standard.