Amount of the tax that you have to pay will depend on type of gain. Is it short term gain or long term gain? Will you have any other capital losses or carry over losses that you can use to reduce RSU gain?
Any short term capital gain will be taxed at your regular income tax rate ( 10% to 37%). Any long term capital gain tax rate can be either 0%, 15% or 20%. It is hard to say which long term capital gain tax rate you will fall under without knowing your total other income or deductions. But here is a IRS link about tax brackets.
https://www.irs.gov/taxtopics/tc409
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TurboTax Expert
