what is the penalty for not paying quarterly estimated taxes
Generally, you donât have to pay an underpayment penalty if: 1  You owe less than $1,000 in tax after subtracting withholding. 2  You paid at least 90% of your total tax through withholding and/or estimated tax payments; OR what you paid in tax for 2014 is equal to 100% of your 2013 taxes.nswer: Any underpayment penalty is calculated based on your income, withholding, credits, etc. that you have entered. TaxACT calculates this amount on Form 2210 (or Form 2210-F for farmers and fishermen).