An example of this would look like you buying Bitcoin through Coinbase and then sending it to a Binance wallet address to acquire new coins and assets on Binance that Coinbase does not offer. Selling the tokens and then donating the dollar amount will not reduce your bitcoin tax burden. Form B Overview Form B: Proceeds From Broker and Barter Exchange Transactions is the tax form that individuals receive from their brokers listing their gains and losses from transactions made throughout the tax year.