Basically, if you hold on to the investment for a year or less, your tax rate would be your marginal rate for ordinary income. This is based on what other income you have in the year of sale. Which is why it is important to do your accounting, so you can figure out accurately what you are making. Even if you are not paying taxes on crypto currency, it is still good to see your own personal finances.
Brackets :
Up to $9,325 10%
$9,326 - $37,950 15%
$37,951 - $91,900 25%
$91,901 - $191,650 28%
Etc. up to 39.6%
If you own the Coin for more than a year, then you will pay 0% on the gain until total income is above $37,950. If your total income is above $37,950, then you pay 15% on any gain.
EXAMPLE
If you make $9500 then you would be paying 10% on $9325 and 15% on the remainder $175 ( assuming you do not hold for a whole year etc )
*The decision to sell should be based primarily on your investment analysis and not by the tax consequences. However you can manipulate amount of taxes you will pay by holding or selling short.
TRADER VS INVESTOR
These above taxes are for INVESTORS not TRADERS. If you make a certain number of transactions per year it makes the taxes a lot more complicated. I can make a thread on this later
*Should be for most states if not every