Concerning a taxpayer's requirement to make quarterly estimated tax payments:

a. A C corporation must make estimated payments if its Federal income tax liability for the year will exceed $250.

b. The due dates of the payments for a calendar-year C corporation are March, June, September, and December 15.

c. A C corporation's estimates must total at least 90% of the current-year tax, to avoid the penalty.

d. An individual must make estimated payments if his or her balance due for the Federal income tax for the year will exceed $1,000.