7 Crypto Tax Mistakes to Avoid in 2026

A crypto tax report is only as good as the transactions and records behind it. If you are preparing a 2025 return in 2026, or organizing 2026 activity now, these seven checks can help you find errors before they reach your tax preparer.

1. Reporting only trades that end in dollars

Exchanging one digital asset for another can create a taxable gain or loss even when no dollars enter a bank account. For a digital asset held as a capital asset, compare the value received with the adjusted basis of the asset disposed of. For example, exchanging an asset with a $600 adjusted basis for another asset worth $900 produces a $300 preliminary gain, before applicable transaction costs.

Check: Include swaps, sales, and purchases made with crypto in your transaction review. Keep the date, units, dollar value, basis, and fees for each disposition. The IRS digital assets guide explains the reporting framework.

2. Treating transfers between your own wallets as sales

Moving an asset between wallets or accounts you own is generally not a sale. The IRS notes an exception for digital assets used or withheld to pay transaction services. A transfer that software labels as a sale can inflate proceeds and break the cost basis trail.

Check: Match the sending and receiving transactions, verify ownership of both destinations, and carry the acquisition record forward. Review any fee paid in crypto separately. See IRS digital asset FAQ 81.

3. Assuming Form 1099-DA is the whole tax record

A broker reports the transactions it handled. It may not know what you paid for an asset transferred in from another wallet. For 2025 sales reported in 2026, brokers generally had to report proceeds; basis reporting was voluntary. A blank basis field does not prove a zero basis.

Check: Reconcile each form to the broker export and your broader wallet history. Report applicable transactions even if no form arrives. Our Form 1099-DA guide explains the boxes and the records to gather.

4. Guessing cost basis or changing lot choices after the fact

Basis and holding period depend on the units disposed of and the supporting records. A software default does not establish that you met the rules for identifying specific units. The IRS has detailed identification rules for assets held in a wallet or account.

Check: Preserve acquisition dates, amounts, transaction costs, and the method used to identify disposed units. Have your tax preparer review uncertain lots. Read our cost basis guide alongside the IRS digital asset FAQs.

5. Recording staking rewards only when sold

Under IRS Revenue Ruling 2023-14, a cash method taxpayer who receives certain proof of stake validation rewards generally includes their fair market value in gross income when they gain dominion and control. A later disposition is a separate transaction that needs its own basis and gain or loss calculation.

Check: Record the units and dollar value when the reward becomes available to you, then retain that record for a later sale. Other DeFi arrangements can differ, so review the actual activity before applying this rule. See Revenue Ruling 2023-14.

6. Mixing business receipts with personal holdings

Crypto received for business goods or services is generally measured in dollars when received and recorded as business income. Personal investment activity has a different reporting path. Mixing both in one wallet makes it harder to reconcile receipts, owner activity, and later dispositions, but a mixed wallet does not automatically mean you lost a deduction or triggered an audit.

Check: Identify who owns each wallet and why each transaction occurred. Use separate business wallets when practical, and keep invoices, payment records, and transfer trails. The IRS digital assets guide distinguishes business income from capital transactions.

7. Filing from an unreviewed software summary

Imports can miss a wallet, duplicate a transfer, misclassify a bridge, or leave an unexplained negative balance. A polished report does not confirm that the underlying activity is complete.

Check: Compare wallet and exchange balances with the source records, investigate unmatched transfers, and review proceeds, basis, and income totals before filing. Keep an exception list for items your tax preparer needs to decide.

A practical review order

1. Export activity from every exchange and wallet used during the year.
2. Match transfers between accounts you control.
3. Separate income receipts from sales and exchanges.
4. Trace basis and holding period for each disposition.
5. Compare the reconciled results with Forms 1099-DA and your tax return workpapers.

Tax treatment depends on the facts of each transaction. This checklist helps organize the records; it does not replace a transaction level tax review.

Primary sources: IRS digital assets guide, IRS digital asset transaction FAQs, IRS Form 1099-DA guide, and Revenue Ruling 2023-14.