Until the Securities and Exchange Commission (SEC) rules that utility tokens like SOL are securities, you should at least consider all crypto an asset. Capital gains rules therefore apply when trading crypto for profit and/or loss. Most tax payers will owe 15% or 20% (based on your income) in capital gains tax after holding assets for at least one year then selling. You’ll get taxed at your regular income tax rate on any crypto profits you make from assets you held under one year. Fortunately, buying small amounts of crypto on centralized exchanges like Gemini doesn't usually count towards capital gains—you have to sell it or exchange it for another crypto or fiat currency.