For 2025, we reported gross proceeds without basis or gains/losses to the IRS; only your copy of the Form 1099-DA contains the cost-basis and gains/losses utilizing the FIFO cost-basis method. In certain cases, for example for transfers, the cost basis may be missing, but that does not mean your basis is $0.
For example - missing cost basis for transfers:
Assume you bought 1.0 BTC for $50,000 (your basis), which you transferred from an external wallet or exchange to Kraken. In 2025. within your Kraken account, you exchanged the BTC for $110,000 worth of ETH.
The Form 1099‑DA for 2025 may show $110,000 of proceeds on the sale of BTC, with an unknown cost basis; however, the gain is generally the difference between amount realized and adjusted basis (which is $110,000 - $50,000 = $60,000 gain before considering allocable transaction costs).
Please use your records, obtain support from a third-party crypto tax calculator (CoinTracker, Koinly, etc.), or other professional tax support in order to complete any missing cost basis information.