Your W-2 wages had taxes withheld by your employer.
You can make estimated taxes for the 1099 work at any time during the year. Remember, the schedule set by the IRS is a series of deadlines. You can always make a payment before a set date, and you can cover your entire liability in one payment if you want to. You don't have to divide up what you might owe into a series of four quarterly payments. So you can make the payments monthly if you chose based on the amount paid to you.
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