Step 2: records before moves

Wonder

1. Why does a swap between two tokens trigger a tax event even if no fiat currency changes hands?
2. How can an account closure erase the specific transaction history required to prove cost basis years later?
3. What is the difference between a broker reporting your data to the government and you holding the primary record?

Explore

1. Tax rules differ by country, and this is not tax advice. The US Internal Revenue Service issued Notice 2014-21, classifying virtual currency as property. This designation means that exchanging one form of virtual currency for another is a taxable event, identical in treatment to selling an asset. The basis of the new token becomes its fair market value at the moment of exchange. Without precise records of the date, amount, and price of every prior transaction, calculating the gain or loss on that swap becomes impossible once the original data is dispersed across defunct platforms.
2. Exchanges act as custodians but also as record keepers. When an account is closed or a service shuts down, the granular history of deposits, withdrawals, and trades often vanishes. In the United States, the IRS introduced Form 1099-DA for digital asset brokers starting with the 2025 tax year. While this shifts some reporting burden to institutions, it does not replace the need for individual verification. The broker reports what they track; if their records are incomplete or lost during a migration, the user bears the consequence of missing data.
3. The European Union’s Council Directive (EU) 2023/2226, known as DAC8, mandates the exchange of information on crypto-asset transactions among member states starting in 2026. It requires crypto-asset service providers to report their customers’ transactions to tax authorities. Similar to US regulations, this creates a layer of institutional reporting that assumes the underlying data is intact. Users who consolidate assets without first exporting their full transaction history risk merging disparate cost bases into an untraceable lump sum, making future compliance audits significantly more difficult.
4. Exporting data while accounts are open is a mechanical necessity. Most major exchanges provide CSV or JSON exports of trade histories, including timestamps, prices and fees. These files serve as the primary source for tax software that calculates capital gains. The trade-off between convenience and compliance favors export: keeping an account active provides liquidity but risks data loss through service discontinuation; exporting preserves the record permanently but requires manual storage management. The paper trail is easier to keep than to rebuild from memory or fragmented third-party logs.
5. Fees are a critical component of accurate records. In many jurisdictions, transaction fees paid during acquisition increase the cost basis, while fees paid during disposal reduce the proceeds. Ignoring these figures leads to overstatement of gains and understatement of losses. A complete record includes not just the principal amount but every associated fee, whether in fiat or crypto. This granularity is required for accurate reporting under property treatment rules, where every component of a transaction affects the final tax liability.
6. Before executing any consolidation strategy, such as moving assets from multiple wallets to a single hardware device, verify that all historical data has been archived. Check that exchange exports cover the entire period of account activity and that wallet files are backed up with their corresponding address histories. This step is purely administrative but foundational; it ensures that the transition to self-custody does not sever the link between past transactions and current holdings. The record remains independent of the storage method, providing a durable audit trail regardless of where the keys ultimately reside.

Key facts

Exercise nine, six, three, one

Fact check

Dates, figures and claims checked against the published sources listed below.

• IRS Notice 2014-21 (virtual currency guidance, 2014)
• IRS Form 1099-DA Instructions (Digital Asset Broker Reporting)
• Council Directive (EU) 2023/2226 (DAC8): Tax Administration Cooperation Directive