That sounds a relief for my year-end stock sale. My actual case is a bit more complicated. I had a long term gain in May this year, to which I didn't pay the estimated tax yet. Again, it's my first year of mainly relying on investments. I always had enough w-4 withholding for the previous years. I didn't realize the situation until now. How can I reduce the penalty to the minimum if it is not avoidable?
