A clean file is not a file with no losses. It is a file where gains and losses are both complete, matched to lots, and ready to net under the actual rules. Traders with large numbers on both sides need that cleanliness more than anyone. A missed loss leaves tax on the table. A missed basis turns a modest gain into a fake windfall. Either error is material. Cleanliness comes from one ledger, reviewed exceptions, and reports that tie out. It does not come from rounding until the number ‘looks fair.’ Year-end is the wrong time to start if the year was active. The clean file is built by importing throughout the year or by handing a complete account list to a team with enough lead time. CoinLedger’s Done For You path is a way to buy that clean file when you cannot staff it internally. Large gain/loss years are exactly when that purchase makes sense. Learn more about CoinLedger’s done-for-you cryptocurrency tax tools: Try CoinLedger