Welcome and thank you for giving me the opportunity to assist you with your tax question.
Generally, you are subject to income tax when your restricted stock grant vests. Thetaxable income is the difference between the purchase price (usually $0) andthe market value on the vest date. If you wish to pay your taxes early, you can file a Section 83(b) election to accelerate the calculation and payment of income tax to the grant date. You have stated that you filed a Section 83(b) within 30 days of the grant date; therefore, the payment of income tax would be due at that time and based on the value of the stock on that date.My point of reference for this answer is the following https://us.etrade.com/e/t/estation/help?id=1908050100,which contains additional information you may find useful.
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