Form 1099-DA is a broker information return for digital-asset sales, and the fastest way to misread it is to treat the numbers as a tax bill. Reported proceeds are not profit, and a blank cost-basis box does not mean you acquired the asset for nothing. The form tells the IRS what a broker knows about your activity; your own records are what complete the picture.
The first trap is confusing the tax year with the year the document arrived. A statement you download in 2026 may cover 2025 transactions, a phase that focused on proceeds and mostly left basis unfilled. Basis reporting becomes mandatory in 2026 only for covered assets, generally crypto acquired after 2025, held continuously in the reporting broker’s custody, and sold in 2026. A token bought earlier or moved in from another wallet is noncovered, a label that describes the broker’s reporting duty, not whether your gain is taxable.
Before reading the total, check three fields: box 1f shows proceeds, box 1g shows cost or other basis, and box 2 states whether basis was reported to the IRS. Box 9 flags noncovered status, and boxes 12a and 12b record transferred-in units and their dates. Keep proceeds, basis, and the resulting gain or loss as three separate numbers; a portfolio balance is a fourth figure that need not match any of them.
A small example makes the distinction concrete. Buy two ETH for $2,000 each plus a $40 fee, for a $4,040 lot basis. Sell 1.5 ETH at $2,500 each with a $30 selling fee: $3,720 in proceeds. Allocated basis is $3,030, so the gain is $690, not $3,720 minus zero. If the broker already subtracted the selling fee from proceeds, do not subtract it a second time.
Rebuilding missing basis is a reconciliation task, not a guessing game. Start with the original trade confirmation or account export and preserve the acquisition timestamp, units, dollar value, and fees. Match transfers by asset, quantity, and timing rather than forcing quantities to match blindly. A watch-only wallet confirms addresses, not acquisition cost, and a transfer-in date is not a purchase date. Where records are incomplete, “unknown” is a status to resolve with a tax professional, never a reason to enter zero or borrow a price from memory.
The form also has firm boundaries. It excludes rewards and staking income, and a later sale of rewarded units is a separate event from receiving them. For qualifying stablecoins, brokers may use an aggregate reporting method that requires reporting only when a customer’s designated sale proceeds exceed the de minimis threshold for the year, a reporting rule rather than a tax-free allowance.
Finally, separate a corrected form from corrected records. A wrong taxpayer ID or a sale that was not yours means contacting the issuer and retaining the original, the correction, and the correspondence. Missing noncovered basis usually means completing your own supported records instead. The return’s job is to bridge the broker’s numbers, your other transactions, and the supported basis to Form 8949 and Schedule D, not to force every software total to equal one document.
Source: BTC-Pulse.