The United States income tax system is a pay-as-you-go tax system, which means that you must pay income tax as you earn or receive your income during the year. You can do this either through withholding or by making estimated tax payments.
You can avoid this penalty if you either owe less than $1,000 in tax after subtracting your withholding and refundable credits, or if you 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.
Consider using the estimator at www.irs.gov/W4App to determine the most accurate withholding for the rest of the year.
Instruction for Form W-4
To make estimated tax payment check: How do I make estimated tax payments?
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