The IRS lowered the penalty free withholding amount to 80% for 2018 taxes in a bulletin just issued 22 March:
According to the link, if you already filed and had to pay a penalty (but met the new criteria), you can file a Form 843, Claim for Refund and Request for Abatement and include the statement “80% Waiver of estimated tax penalty” on Line 7. This form cannot be filed electronically.
According to the link, if you already filed and had to pay a penalty (but met the new criteria), you can file a Form 843, Claim for Refund and Request for Abatement and include the statement “80% Waiver of estimated tax penalty” on Line 7. This form cannot be filed electronically.

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