Thanks for the answers! How about the transfer from Coinbase to my hardware wallet? Coinbase wouldn‘t know that I am transfering to myself. Do they only file 1099s when going from BTC to USD, or also for transfering BTC to a wallet?
as far as coinbase not knowing that you're transferring to yourself, that may change very soon:
https://bitcointalk.org/index.php?topic=5293390.0anyway, when they send a 1099-K to the IRS, it reports gross
trading volume---BTC/fiat or altcoins.
deposits, withdrawals (to your hardware wallet), internal transfers between coinbase and coinbase pro, etc do not count towards that number.
note: in a surprise twist, coinbase will stop issuing form 1099-K, and they won't be issuing form 1099-B like square does either.
https://help.coinbase.com/en/pro/taxes-reports-and-financial-services/taxes/coinbase-tax-resource-center