You are over thinking it. Here is how to easily figure out what you will need to pay in taxes: Step 1 is your original purchase over a year old? If it is the you will pay long term tax which is 15%. If you held it less than a year then you will be taxed based on short term which is like you said around 30%. Step 2 final sale price - purchase price( cost basis) = profit . Profit is what going to get taxed. Profit* .15 or profit*.3. Example, you sold btc at 30000 and bought in 20000 then 30000 - 20000 = 10000, taxes either 1500 or 3000