Hey, you can read @Ratimov's tutorial -
[Tutorial] Crypto taxes for beginnersTo answer your question, yes you can spend your crypto you've held for over a year and be subjected to long term capital gains tax.
If I am not mistaken, what you sell/move is what's subjected to tax. The balance you held isn't. The problem here is when your BTC will be sent to the recipient's address and to a change address which you also own.
To make things simple for you, it would be wise to have a separate wallet for BTC you plan to hold for long term and those you plan on spending short term.
Tax matters are in different form and varies from one country to the other, in my country all deposits into banks account are subject to tax of the federal government through the central bank.