Most taxpayers can avoid the penalty by ensuring they have paid taxes equal to 100% of the prior year tax liability. This can be via withholding or estimates. If your AGI is over $150,000, you must pay 110% of the prior year tax liability in order to avoid a penalty.
If you have W-2 income, just be sure you withhold an amount equal to or more than your 2018 tax liability (or 110% of it if AGI is over $150,000).
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