Let's say on your 2008 tax return you chose to pay estimated taxes on 100% of your estimated 2009 income. You pay the full amount for Q1. You pay the full amount for Q2. The due date for Q3 estimated taxes is coming up quickly. And it hits you that you have paid more in estimated taxes so far than you have made in total income this year. It has been a slow year. You also know that the rest of the year, you won't make enough money to pass the amount of estimated taxes that you have already paid this year so far.
Given this scenario, do you still have to pay estimated taxes for Q3 and Q4? Or must you continue paying the full amount for Q3 and Q4 that you estimated for your 2009 income back when you did your 2008 taxes?