No matter how much your investment grows, you’ll never pay taxes on gains in a crypto IRA. You may even be able to avoid taxes altogether. Upon eligibility to take distributions:
Traditional and SEP IRA distributions are subject to income taxes only.
Roth crypto IRA qualified distributions are completely tax-free.
Additionally, unlike when you trade crypto outside a tax-advantaged account, doing so within an IRA allows you to avoid the often-tedious process of reporting trades on your taxes each year.