When working on people's taxes and have them have a balance due after starting that new job, I have to have a conversation explaining how the new W-4 form works.  You know, that form you have to fill out to tell your employer how much money to withhold from your paycheck to cover your tax liability.

If you don't like owning taxes at the end of the year, then here are some things you should know:

1. When you have to fill out a W-4 form

You are not required to file a W-4 form with your employer each year, but a lot of people don't realize that you are allowed to fill out a new form any time your situation changes.  Like you get a second income coming into the household, get married or you have a new child.