Usually not necessary. TT does a good job in calculating the underpayment tax penalties whenever not enough tax was withheld to cover the tax liability. For example you may have reported all your income in one quarter, and thus you were required to withhold your taxes on that income all in that period. If you didn't do it that way, then you may wish to spread your income over the four quarters so that it shows that the taxes were only required to be withheld evenly throughout the year. This is called the annualization method. By doing so, you can reduce your penalty for underpaying the taxes.
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