Tax advice when selling crypto

Hey everyone, when getting taxed on your gains can gas fees be deducted from your gains? I know I transferred crypto from coinbase and back and kept a record of those costs for myself but was wondering how they factored in at tax time

Just using imaginary numbers but say I made 10K from selling btc but throughout my time holding btc I had 500 dollars worth of gas fees transferring it around. Would this then be reduced from my gains allowing only 9.5K to be taxed?

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Also in the USA how much tax will I be expected to pay. I know I held this for longer than a year and so I am expecting the normal long term capital gains of 20%. Is this assumption correct?