I work full-time as an attorney (I'm an employee, not a contractor) and earn (this year) roughly $100K per year, including bonuses.
As a creative side project, I wrote a book 2 years ago. I started earning royalties in Feb, 2016. Royalties for this year will likely be in the $12K-$15K range. I get a monthly check.
I upped my federal and state withholdings to compensate for next year's taxes that will be owned on the royalties. That should be a wash. In fact, we'll probably get a largish return.
But when do I need to start reporting my royalty income quarterly? Next year? For this first year, I thought I would be okay since I wasn't clear if I'd even earn any royalties (my book's small success was a surprise) and I had no track record of earning self-employment income.
When do I pay Social Security taxes, etc? If I hit the SS cap through my full-time job, does that exempt me from being SS taxes on my royalties? How does it all work together?
I am sitting down with an accountant in a few months but I just figured I'd go into the meeting as prepared as possible. I've had a hard time finding guidance online for situations where the self employed person earns most of his/her money from a regular job.