General CIT Rate
Federal corporate income tax: 21%. State CIT generally ranges from 1% to 10% (although some states do not impose CIT) and is deductible for federal CIT purposes.
CIT Return Due Date
April 15 for calendar-year corporations (15th day of the 4th month after the tax year-end); a 6-month filing extension to October 15 is available. State income tax returns usually follow the federal due date, with a few exceptions.
CIT Payment Due Date
Tax must be fully paid by the original due date of the return (April 15 for calendar-year corporations); the final estimated instalment is due on the 15th day of the 12th month of the tax year.
CIT Estimated Payment Due Date
Four equal instalments of estimated tax, due by the 15th day of the 4th, 6th, 9th and 12th months of the tax year (April 15, June 15, September 15 and December 15 for calendar-year corporations).