@dmertz
Thank you for your detailed reply. I can confirm that 2021 was my first year living in Maryland with no taxes due for 2020. My only question is - does the 110% rule apply even if this is my first year paying taxes in MD? I do use the desktop version, and Turbotax even asked me whether this is my first year filing taxes for MD for this specific question. It still generated the interest charges despite this entry. 502UP form generated by Turbotax desktop version has a checkbox for first time MD filer and simply uses 90% of my 2021 taxes due as the evaluation of underpayment of taxes, so I just wanted to be safe in making sure I’m rightfully using $0 as the main reference (110% of my taxes due in 2020).
