I'm not a CPA, nor do I play one on TV nor did I stay at a Holiday Inn last night.
To my understanding, your Schedule C for independent contractor income, shall show a profit 2 years (or 3?) out of the past 5 rolling years. If so, it's a "business".
If not, it's a "hobby".
A hobby cannot be used for tax purposes.
Well I am a CPA,
.
The 3 out of 5 rule is not in the IRS regs and as far as I know is not in any of the IRS guidelines.
There are actually 9 factors that are in the IRS guidelines (not regs) as to whether it is a business or hobby. And while none of them are determinate in and of themselves, it is what an IRS would look at to determine
Whether you carry on the activity in a businesslike manner and maintain complete and accurate books and records.
Whether you have personal motives in carrying on the activity.
Whether the time and effort you put into the activity indicate you intend to make it profitable.
Whether you depend on income from the activity for your livelihood.
Whether your losses are due to circumstances beyond your control (or are normal in the startup phase of your type of business).
Whether you or your advisors have the knowledge needed to carry on the activity as a successful business.
Whether you were successful in making a profit in similar activities in the past.
Whether the activity makes a profit in some years and how much profit it makes.
Whether you can expect to make a future profit from the appreciation of the assets used in the activity.
A number of these do not apply to officiating.
All that said, it has long been established that Officiating sports is generally a business. And it has also been quite historical that the IRS couldn't care less about going after officials because it isn't worth their time for what they might find.
So in other word I don't worry about the IRS when it comes to income taxes on officiating income, just do what I have always done.
That said, I claim every penny that I make and very detailed on my expenses. I have no desire to lose my license, even though the chances of the IRS "auditing" me on my officiating income is very, very slim.
The above does not constitute any tax advice for yours or any others tax situation. Please consult your own tax advisor for advice on your particular situations.