Make your best guess; it is just an estimate. If you didn't pay enough tax throughout the year, either through withholding or by making estimated tax payments, you may have to pay a penalty for underpayment of estimated tax.
Generally, most taxpayers will avoid this penalty if they either they owe less than $1,000 in tax after subtracting their withholding and refundable credits, or
if they paid withholding and estimated tax of at least 90% of the tax for the current year or 100% of the tax shown on the return for the prior year, whichever is smaller.
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