Reconciling 4,500 1099-DA Transactions With a Complete Crypto Transaction History

• 4,500 1099-DA Transactions
• 5 Exchanges & Wallets
• U.S. Crypto Tax Reporting

How Bitcounts Reconciled Exchange-Reported 1099-DA Data

The client received Form 1099-DA from their crypto exchanges for the 2026 tax year. While the forms provided transaction information reported by the exchanges, they did not necessarily represent the client's complete crypto transaction history.

The client had activity across 5 exchanges and wallets, requiring the reported 1099-DA transactions to be compared against the broader transaction history. Assets reported as sold by an exchange could have originally been acquired elsewhere, transferred into the exchange from a personal wallet, or moved between multiple accounts before the final disposition.

Bitcounts performed a detailed reconciliation of 4,500 1099-DA transactions against the client's complete crypto transaction history. We matched reported sales with the underlying transactions, traced transferred assets back to their acquisition history, reviewed cost basis, and identified discrepancies between broker-reported information and the client's reconciled records.

The objective was not to prepare or issue the 1099-DA. Instead, Bitcounts provided the transaction-level reconciliation and review needed to help the client and their tax professional determine whether the information reported by the exchanges was complete and accurate for tax filing purposes.

The Challenge

• Client received 1099-DA forms from crypto exchanges for the 2026 tax year
• More than 4,500 1099-DA transactions required reconciliation
• Exchange-reported activity represented only part of the client's overall crypto portfolio
• Assets sold on an exchange may have originally been acquired through another exchange or self-custody wallet
• Transfers into exchange accounts could appear separately from the original acquisition
• Broker-reported transaction information needed to be compared against the client's own transaction records
• Cost basis for certain assets required review against historical transaction data
• Activity across 5 exchanges and wallets created a fragmented transaction history
• Internal transfers could be mistaken for taxable transactions without proper reconciliation
• Differences between 1099-DA information and the client's reconciled records required investigation

Our Solution

• Collected the client's 1099-DA forms and transaction reports from the relevant exchanges
• Consolidated exchange, wallet, and blockchain transaction data
• Mapped the client's 5 exchanges and wallets
• Matched 1099-DA reported sales with the corresponding underlying transactions
• Traced assets sold through exchanges back to their original acquisition records where available
• Matched transfers between the client's own wallets and exchange accounts
• Reviewed reported proceeds and transaction details
• Reconciled cost basis using the client's historical transaction records
• Identified duplicate, missing, or inconsistent transactions
• Investigated discrepancies between exchange-reported information and blockchain activity
• Flagged transactions requiring additional documentation or clarification
• Prepared a reconciled transaction dataset for the client's tax professional

How We Reconciled the 1099-DA

The core of the engagement was comparing what the exchanges reported with what actually occurred across the client's broader crypto portfolio.

For each relevant 1099-DA transaction, Bitcounts worked backward through the client's transaction history to establish the complete asset trail.

For example, an exchange may report the sale of an asset, while the corresponding acquisition may have occurred on another platform. The asset may then have been transferred through one or more self-custody wallets before reaching the exchange where it was ultimately sold.

Our reconciliation connected:

1099-DA Reported Sale → Exchange Transaction → Transfer History → Original Acquisition → Cost Basis

This allowed us to determine whether the reported transaction could be supported by the client's underlying records.

We reviewed:

• 1099-DA reported sales
• Exchange transaction histories
• Deposits and withdrawals
• Wallet-to-wallet transfers
• Exchange-to-wallet transfers
• Original acquisition transactions
• Crypto-to-crypto trades
• Cost-basis records
• Transaction fees
• Blockchain transaction records
• Missing and duplicate transactions

1099-DA vs. Complete Crypto Portfolio

A 1099-DA should not necessarily be treated as the client's complete crypto transaction history.

The client's actual tax position may depend on transactions that occurred outside the broker that issued the form. An asset reported as sold by an exchange, for example, may have been purchased on another exchange and subsequently transferred through one or more self-custody wallets.

The exchange's reporting may capture the final disposition, while the information needed to establish the complete cost basis may exist elsewhere.

Bitcounts reconciles these separate data sources to reconstruct the complete transaction trail.

Cost Basis Reconciliation

Cost basis was a key component of the 1099-DA reconciliation.

Where the exchange-reported information could not be matched directly to an acquisition record, Bitcounts reviewed the client's historical transaction data to identify the original acquisition and reconcile the relevant cost basis.

Our process included:

• Identifying the asset reported as sold
• Tracing the asset through transfers and wallet movements
• Locating the original acquisition
• Matching acquisition quantity with the subsequent disposal
• Reviewing historical transaction prices
• Accounting for relevant transaction fees
• Identifying missing acquisition information
• Flagging unsupported or unresolved cost-basis records
• Connecting the reconciled cost basis to the reported disposition

This created a transaction-level audit trail supporting the client's final tax reporting.

The Results

• 4,500 1099-DA transactions reconciled against the client's broader crypto activity
• Transactions across 5 exchanges and wallets reviewed
• Exchange-reported sales matched to underlying transaction histories
• Transfers between exchanges and self-custody wallets identified and matched
• Historical acquisition records connected to reported dispositions
• Cost basis reviewed against the client's underlying transaction records
• Differences between 1099-DA information and the client's records identified
• Missing and duplicate transactions flagged for resolution
• A reconciled transaction dataset provided to support the client's 2026 tax filing

Implementation Process

Our 1099-DA reconciliation process was structured into three key phases:

Phase 1: 1099-DA & Portfolio Data Collection

• Collected 1099-DA forms received from the client's crypto exchanges
• Collected detailed transaction reports from those exchanges
• Gathered transaction data from other exchanges and self-custody wallets
• Mapped the client's complete crypto portfolio
• Identified reporting gaps and potential discrepancies

Phase 2: Transaction & Cost-Basis Reconciliation

• Matched 1099-DA reported sales to exchange transactions
• Traced sold assets through wallet and exchange transfers
• Located original acquisition transactions
• Reviewed historical cost basis
• Matched deposits and withdrawals between the client's own accounts
• Investigated missing, duplicate, and inconsistent transactions
• Used blockchain explorers to validate unresolved activity

Phase 3: Final Review & Tax Reporting Support

• Compared reconciled transactions against 1099-DA information
• Identified discrepancies requiring client or exchange clarification
• Reviewed proceeds and cost-basis information
• Documented unresolved transactions
• Finalized the reconciled transaction dataset
• Provided supporting reports and workpapers for the client's tax professional

The Bitcounts Difference

Receiving a 1099-DA does not mean the client's crypto tax work is complete.

The form represents information reported by the issuing broker, while the client's complete tax history may involve multiple exchanges, self-custody wallets, historical acquisitions, and blockchain transactions outside that broker.

Bitcounts acts as the reconciliation layer between the exchange-reported 1099-DA and the client's complete crypto transaction history.

We trace reported dispositions back through transfers and historical acquisitions, review cost basis, identify discrepancies, and provide the client and their tax professional with a reconciled transaction dataset to support accurate tax reporting.

Received a 1099-DA from your crypto exchange?

Talk to Bitcounts about reconciling it with your complete crypto transaction history.

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