A file extension, or file name extension, is the letters immediately shown after the last period in a file name. For example, the file extension.txt has an extension of .txt. This extension allows the ...

For most taxpayers, the federal tax deadline is April 15. It's possible to push that due date to Oct. 15 by filing for an extension. But you still must pay your taxes by the original due date to avoid ...

The deadline by which S corporations must file their federal tax returns is March 15. If it's challenging to gather all the necessary information to complete your return, you may choose to file for an ...

A file extension is a suffix that is added to the end of a file name after a dot. It is usually two to four letters long. File extensions help Windows and other operating systems to know the standard ...

Every file that we have saved on our computers has a particular extension. The file extension is added at the end of the filename followed by a dot (.). It tells the operating systems about the ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Lea Uradu, J.D., is a Maryland state registered tax preparer, state-certified notary public, ...