Thanks for this info, I'll look it over. However shortly after I made my initial post, I panicked, and made an extra payment rather than waiting until Q2. I suspect this is going to cause me problems come tax time but since I had no idea how much a penalty would be I erred on the side of caution and went for it. If anyone knows how best to deal with this come tax time with TurboTax, I would greatly appreciate the guidance. Essentially what I have is an insufficient (and slightly late) Q1 payment and then a supplementary payment that brings me up to the correct amount for Q1 made a few days later. All sorts of doing it wrong for me! Whee!
