Fiscal year, in this case whales meaning Corporations that report quarterly and pay dividends.

Tax Filing Date Businesses that end their year December 31 normally file their taxes on April 15. Since sole proprietors file schedule C with their personal taxes, they can file for a six-month extension if they aren't ready at tax time. C corporations and S corporations must file 3 1/2 months after the end of their fiscal year.

From Google A Company pays Corporation Tax on its profits before dividends are paid out. Consequently, shareholders are treated as having already paid tax on their dividends (called a 'tax credit'). A shareholder who is paying Higher Rate Tax will have the dividends added to their income and will have extra tax to pay