I recently had a stock sale with a sizable profit. In the past when this event occurred, I would adjust my w2 withholding to withhold more taxes so my end of year amount due was close to $0. Unfortunately earlier this year, I lost my job so that is not an option.
If I want to make an estimated payment, based on tax bracket and expected due from my stock sale, do I just use the IRS website (https://www.irs.gov/payments/online-account-for-individuals)? Or are there special forms needed prior to making estimated tax payments?