As a small business person-slash-advice columnist I dread the first quarter of the new year. Not because in my mind my own business fortunes start at zero again every January or because I have already dismissed every New Year’s resolution I made when the clock rang out the New Year.

No, the reason I dread the first quarter of the new year is that my email box floods with questions about business taxes and the IRS, my two least favorite subjects on earth. It’s not that I am opposed to paying my fair share of business taxes. It’s that I consider the IRS to be a little like Beetlejuice, the movie demon who appeared only after his name was called three times in a row. My fear is if I write too many IRS columns their dark agents may appear on my doorstep, ready to drag me away to an uncertain fate.

Oh well, one must do his duty no matter the consequences, so here we go.

Q: I am starting a small retail business. While talking to a potential supplier last week he asked for my EIN number. I had no idea what he was talking about, so I told him I would have to get back with him because I didn’t have the number handy. What is an EIN number and why do I need one? — Robert P.

A: Robert, do you remember the old Johnny Rivers song “Secret Agent Man?” There was a line that said, “They’re giving you a number and taking away your name.” An EIN isn’t as cool as a secret agent number, but it works much the same way when it comes to your business’ relationship with the IRS. Instead of identifying your business by name, the IRS identifies your business by EIN.

EIN stands for Employer Identification Number and is also known as a federal tax ID number. The EIN is a nine-digit number that the IRS assigns to businesses and is used to identify taxpayers that are required to file various business tax returns.

Does your business need an EIN? According to the IRS the answer is yes if: