How to handle digital asset basis gaps with Form 1099-DA

Digital asset tax reporting can become complicated when Form 1099-DA, Digital Asset Proceeds From Broker Transactions, doesn’t provide all the information needed to calculate a client's gain or loss. Missing cost basis, transfers between wallets, incomplete transaction histories and inconsistent tax lot methods can leave tax professionals responsible for reconciling broker reporting with the taxpayer's actual records.

As Form 1099-DA becomes part of the reporting workflow for more clients, tax professionals need a consistent process for identifying discrepancies, documenting digital asset cost basis and supporting amounts reported on individual income tax returns.

What is Form 1099-DA?

Form 1099-DA provides information about digital asset broker transactions, but the information reported may not be enough to accurately calculate taxable gain or loss.

When basis information is missing or incorrect, the taxpayer's own records become critical. Tax professionals may need to reconcile reported proceeds with transaction histories and determine what additional information is necessary to establish and document cost basis.

Consider a client who purchased digital assets years ago on one platform, transferred them to a personal wallet and later moved them to another platform before selling them. The broker handling the sale may have information about the proceeds without having the client's complete acquisition history.

How do digital asset transfers affect cost basis records?

When a client moves an asset from one wallet or platform to another, the receiving platform may not have enough information to establish the asset's complete history. The client may know the transferred assets were previously acquired, but the available records may not clearly connect the original purchase with the eventual sale.

Review all transaction histories to determine when assets were acquired and document how basis was established. If a client uses multiple wallets and platforms, this process can be even more challenging.

A consistent digital asset reconciliation process can help uncover these gaps before the return is completed. Brokers are not required to report basis for noncovered securities, including digital assets acquired before Jan. 1, 2026. For example, a digital asset purchased on Dec. 31, 2025, is considered a noncovered security, so the broker is not required to report the taxpayer’s basis. Determining the acquisition date is therefore key.

Why might Form 1099-DA totals differ from other records?

Sometimes Form 1099-DA amounts do not match exchange statements, transaction histories or third-party digital asset tax reports. Digital asset reporting is not simply a data-entry exercise. It can require careful reconciliation and documentation, especially when broker reporting and taxpayer records don't align.

Inconsistent tax lot methods can cause these differences. Instead of assuming one set of records is correct, determine why the discrepancy exists and what additional information is needed to support the return.

Create a repeatable digital asset tax reporting process

Digital asset reporting does not have to turn every return into a reconstruction project. A consistent approach to client intake, transaction reconciliation and cost basis documentation can help tax professionals handle these engagements more efficiently.

NATP's upcoming digital asset reporting workshop focuses on the real-world challenges practitioners may encounter when preparing individual returns. You'll learn how to identify what is reported on Form 1099-DA, reconcile proceeds with client transaction records, investigate mismatched totals and document cost basis when broker information is incomplete.

Join the workshop, Real-World Digital Asset Reporting, to build a practical process for Form 1099-DA reporting, digital asset cost basis, transaction reconciliation and documentation that can help you prepare accurate, supportable individual tax returns.