I have read these articles before but none of them explain why I am receiving a penalty this year when I never have before. I understood I would owe money since I have had to pay for the past few years. I have never received a penalty for 'underpayment' and there have been no significant changes in my earnings on W-4 elections. I do not make payments quarterly, as mentioned in the link, so how am I able to make sure this does not happen again when I cannot determine why it is happening now?
