What Coinbase sends to the IRS, and what users still have to fix

Coinbase users are entering a new reporting cycle. For the 2025 tax year, the exchange began issuing Form 1099-DA for reportable crypto sales and exchanges. Coinbase sends the form to the IRS and makes a copy available to the customer.

That sounds like the end of the tax calculation. It is not. The form tells the IRS about activity Coinbase can see, and the first-year version generally reports gross proceeds without cost basis. Users still need to determine what they paid for the assets sold, account for transfers, and combine Coinbase records with activity from every other platform and wallet.

The result is a familiar crypto problem with a more formal paper trail. The IRS may have the sale side of the equation while the taxpayer remains responsible for rebuilding the purchase side.

What appears on Coinbase’s Form 1099-DA

For tax year 2025, Coinbase says Form 1099-DA includes proceeds from sales and exchanges of crypto assets. A crypto-to-dollar sale is reportable. A crypto-to-crypto exchange is also a disposition, even if no dollars ever reach the account.

Gross proceeds are the cumulative amounts received across those dispositions. They are not net profit, taxable income, or the account balance. A frequent trader can reuse the same capital many times and generate a proceeds total that is much larger than the cash originally deposited.

Coinbase may also issue other tax forms depending on the customer’s activity. Certain reward or income items can be reported separately from digital asset dispositions. Receiving no form for an item does not make otherwise taxable income disappear. The taxpayer’s obligation is based on the transaction, not only on whether a platform crossed an information-reporting threshold.

Coinbase provides forms and account reports through its Tax Center. From tax year 2025 onward, however, Coinbase says its Retail Tax Center no longer provides Form 8949. Users need to prepare their own disposition reporting or use other tax preparation tools and professional support.

Why transfers create missing basis

Moving crypto between accounts owned by the same person generally is not a taxable sale. The tax basis and holding period should travel with the asset. The data often does not.

Suppose someone bought BTC on another exchange several years ago, moved it to a hardware wallet, and later deposited it at Coinbase to sell. Coinbase sees the deposit and the sale. It did not handle the original purchase, so it may not have reliable information about the purchase price or acquisition date.

For 2025, that limitation is widespread because the 1099-DA phase-in generally requires proceeds reporting, not basis reporting. Beginning with 2026 transactions, brokers must report basis for covered digital assets. In general, an asset is covered when it was acquired after 2025 in a custodial account with that broker and remained there until the broker disposed of it.

Transferred-in assets are generally noncovered. A future 1099-DA can therefore include basis for one Coinbase sale and leave basis blank for another sale on the same account. Blank does not mean zero. It means the user must support the basis from other records.

Transfers out create the opposite visibility problem. Once assets leave the exchange, Coinbase cannot see what happens in a self-custody wallet, decentralized exchange, bridge, or lending protocol. If assets later return, the account history may show movements without the full economic story between them.

What the Coinbase Tax Center can and cannot do

The Tax Center is useful for downloading IRS forms, transaction history, and Coinbase account reports. It can help users review gains, losses, earned income, and cost-basis details connected to activity Coinbase has recorded.

Its boundary is the platform. It cannot independently verify an acquisition made elsewhere. It cannot classify every transaction inside an outside wallet. It also cannot know whether an address belongs to the same user unless that connection is supplied and reconciled.

Coinbase encourages users to review and edit cost-basis details so their records remain accurate. That is especially important for imported assets. A basis value entered into a dashboard still needs evidence such as trade confirmations, exchange exports, wallet records, and a consistent lot-identification method.

Users should also distinguish the Coinbase exchange from Coinbase Wallet. The wallet is a self-custody product, so its on-chain activity is not the same account ledger as the custodial exchange. A transfer between the two may be nontaxable, but it still needs to be linked correctly.

A practical reconciliation sequence

Start with the tax documents Coinbase provides, then download the complete transaction history for the year. Do the same for every other exchange. Collect public wallet addresses, staking records, and any files from platforms that no longer operate.

Next, build one chronological ledger. Match transfers out of one source with transfers into another. Preserve acquisition date and basis as assets move. Review network fees separately because crypto used to pay a fee can itself be disposed of.

Then compare the ledger with the 1099-DA. The total reportable proceeds should be accounted for, but the return should also include supported basis and any other taxable activity outside Coinbase. Large differences need an explanation before filing, not after an IRS notice arrives.

Count On Sheep’s Coinbase IRS reporting guide takes this reconciliation-first view. It treats the exchange form as a starting point, then connects Coinbase proceeds with the transaction history from outside wallets and platforms. Human review can be useful when software shows zero basis, duplicate transfers, or balances that do not match the assets actually held.

Common mistakes to catch before filing

The first is treating proceeds as gains. If an asset sold for $20,000 and had a supported basis of $15,000, the economic gain is $5,000, not $20,000.

The second is accepting zero basis for every transferred-in asset. That can overstate gains substantially. The fix is not to invent an estimate, but to locate and preserve the original acquisition record.

The third is reporting Coinbase in isolation. A taxpayer’s gain or loss calculation spans the entire ownership history of the asset, even when that history crosses exchanges and self-custody wallets.

Finally, users sometimes omit activity because no tax form arrived. The IRS requires taxpayers to report taxable digital asset transactions whether or not an information return was issued.

Coinbase’s reporting gives users a valuable checkpoint. It does not replace the ledger that explains where each asset came from, what it cost, and what happened after it left the exchange. This article provides general tax information, not individualized tax or legal advice.

Disclaimer: This is a paid post and should not be treated as news/advice.