I suggest you set up a new account in TurboTax and complete a pro-forma tax return in which you enter your anticipated income and deductions for next year, but don't enter any tax withheld. When you are done, you will see an estimate of the tax you owe and this will be your estimated tax for next year. You can use this number to adjust your tax withheld amounts so that you end up paying in the correct amount of tax.
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