Your cost basis determines how much tax you owe on every crypto transaction. If you have crypto cost basis missing records, your IRS liability could be dramatically inflated.
Why Cost Basis Matters
Capital gains tax is calculated as sale proceeds minus cost basis. If you bought Bitcoin for $30,000 and sold for $60,000, your gain is $30,000. If you cannot prove your $30,000 cost basis, the IRS may treat your entire $60,000 in proceeds as gain. The difference in tax owed is enormous.
Common Cost Basis Problems
Crypto traders face unique cost basis challenges. Exchanges close or lose records. Wallets are lost or inaccessible. Transfers between exchanges break the cost basis chain. Airdrops and hard forks create assets with unclear basis. Years of casual trading without record-keeping leave gaps that the IRS will fill with the worst possible assumption.
Reconstruction Methods
Even with missing records, cost basis can often be reconstructed. Blockchain transactions are permanent and public. Exchange APIs and data exports can recover historical records. Bank and credit card statements show fiat purchases. Email confirmations provide purchase dates and amounts. A crypto tax professional uses all available data to establish the most defensible cost basis position.
FIFO, LIFO, and Specific Identification
The cost basis method you choose affects your tax outcome. FIFO (first in, first out) sells your oldest coins first. LIFO (last in, first out) sells your newest coins first. Specific identification lets you choose which coins to sell. Each method produces different gains and losses depending on your purchase history and price movements.
Frequently Asked Questions
What is cost basis for crypto?
Cost basis is the amount you paid to acquire the crypto, including purchase price and fees. It determines your capital gain or loss when you sell. Without documented cost basis, the IRS may assume zero, treating all proceeds as taxable gain.
How do I find my crypto cost basis?
Check exchange transaction histories, bank and credit card statements for fiat purchases, email confirmations, and blockchain records. Crypto tax software can aggregate data from multiple sources to calculate basis.
What happens if I lost my cost basis records?
Cost basis can often be reconstructed from exchange records, blockchain data, and financial statements. A crypto tax professional can rebuild your transaction history using available data sources.
Talk to a Crypto Tax Attorney
If you are dealing with crypto cost basis missing records, you do not have to figure this out alone. Contact the Law Offices of Darrin T. Mish, P.A. at (813) 229-7100 for a free consultation. 32 years of IRS resolution experience. Over $100 million in tax debt resolved.