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You will have to pay the withholding at the time the stock vests. Although the tax is not due until April 15, 2013 when you file your tax return you have to pay withholding as though you received cash wages. Some plans allow you to reduce the number of shares you receive to cover the withholding obligation.
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Technically yes because the day the stock vests is like them giving you a check for $4,000. You can start putting money aside now or your company can take the amount needed out of your check over a period of time. If the withholding is going to be $1,000 you could start having that taken out of your check now to deal with it.