How a Crypto Investor Got Audit-Ready After Years of Ignored Wallets
Sam's List Editorial | 2026-07-14
How a Crypto Investor Got Audit-Ready After Years of Ignored Wallets Most crypto tax problems aren't caused by aggressive positions. They're caused by silence, years of trades nobody wrote down. What follows is an illustrative, representative scenario based on the kinds of situations active crypto investors face. It is not a specific client's account, and the details are a composite. It's here to show a common mess and a realistic path out of it, not to promise a particular result. The Setup: Four Wallets, Two Dead Exchanges, No Cost Basis An active investor had been in crypto for years. Somewhere in that time the record-keeping stopped. By the time taxes became a real worry, the situation looked like this: four self-custody wallets, activity on two exchanges that had since shut down, DeFi transactions across a couple of chains, and no organized record of what anything had cost. The investor knew roughly what the holdings were worth today. What was missing was cost basis, the original purchase price that determines the gain or loss on every sale, swap, and conversion. Without basis, there's no defensible way to calculate what's actually owed, and the default assumption in an audit can be unfavorable to the taxpayer. This is a common place to end up. Crypto makes it easy to transact and hard to remember, and the years pile up quietly until something forces the issue. Why the 1099-DA Era Raises the Stakes For a long time, crypto reporting relied heavily on the taxpayer's own records because exchanges reported little in a standardized way. That's changing. Starting with the 2025 tax year, brokers are required to report digital asset sales to the IRS on the new Form 1099-DA, and cost-basis reporting phases in after that. The effect is straightforward. The IRS is getting far more visibility into crypto activity, and gaps between what a broker reports and what a taxpayer files become easier to spot. For someone with years of unrecorded history, the era of assuming nobody's looking is ending. Getting organized is no longer something to put off indefinitely. The Reconstruction: Rebuilding Basis From the Chain Up The work of getting audit-ready was, in essence, forensic accounting for a blockchain. The goal was a complete, defensible transaction history with a basis for every asset. It came together from several sources. Public blockchain data provided an immutable record of on-chain transactions for the self-custody wallets, so even years-old activity could be traced by wallet address. Exchange exports, including from the platforms that had shut down, were...
