I am selling stock and will be paying capital gains tax by myself for the first time. I've done my research and know the % I need to pay for federal and state taxes. I also spoke with my CPA on the phone and he advised me. I would like my CPA who has been doing my taxes each year to review my tax calculations to make sure I pay the correct amount of tax. Will it take my CPA a long time to review my estimated payments? Also, should I offer to pay my CPA to just review the payments I want to make now? If I wait until next year, I can just have my CPA calculate the amount of tax I need to pay at no extra charge (I would just have to pay the standard flat rate for tax preparation). However, if I do this, I will pay a penalty for not paying taxes in the quarter I recognized the gain.

This is for USA