If at filing time, you have not prepaid enough income taxes through withholding or quarterly estimated payments, you may have to pay a penalty for underpayment. If you have to pay more than $1,000 in taxes, you owe the penalty. If you did not prepay at least 90 percent of the total tax due for this tax year, you owe the penalty.
See this about estimates https://turbotax.intuit.com/tax-tips/small-business-taxes/estimated-taxes-how-to-determine-what-to-pay-and-when/L3OPIbJNw