You don't need to check anything before making a purchase with bitcoin. You just need to use a wallet that lets you export a csv of transactions and import those into your tax software the next year and let it compute the capital gains that you owe. If you exchanged an amount of bitcoin with a gain of $1 for a cup of coffee you don't need to send the IRS any paperwork or its $0.15 until April 15 the next year.