Deductions & credits

Thank you! So, I just checked with my credit union and the rate they gave me was 9% for a fixed HELOC. So, unless I can find something better than the IRS rate penalty, I should just pay the IRS as quickly as possible before October 15th. Would I still tagged with a penalty if I pay the entire amount due before then? 

Also, a friend of mine doesn't withhold anything extra - he just automatically places a set amount into a savings account for each paycheck and then uses that to pay the IRS with his filing every year. But, he would still be paying a penalty, correct? Since the IRS is going to penalize him for not paying them with each pay period?

 

Thanks, again!