Because of the number of changes in the rules for 2018 triggered by the Tax Cuts and Jobs Act, the IRS is waiving estimated tax penalties for certain individuals (IR-2019-03, 1/16/19). Usually, there’s no penalty if you pay at least 90% of what’s owed for the year through withholding and estimated taxes. For 2018, the IRS is lowering this threshold to 85%.
It is expected that tax preparation software will be adjusted to reflect this new percentage. Similarly, Form 2210 and the instructions will be revised accordingly.
Note: Even if you fall short of this 85% tax payment requirement, you may still escape estimated tax penalties in other ways:
The excess of the tax assessed by the IRS over the amount reported on your return.