Which of the following statement(s) concerning estimated tax payments and underpayment penalties for individuals is (are) true?
A. Whether taxpayers are subject to underpayment penalties is determined on a quarterly basis.
B. Due dates for estimated tax payments for a given year are April 15, June 15, September 15 of that year and January 15 of the next year unless these dates fall on a weekend or a holiday.
C. The amount of penalty depends on the amount of the underpayment among other factors.
D. All of these statements are true.
Answer: D. All of these statements are true.