If you hire a CPA, I doubt they'll know anything about masters' prize money. A little history will help.
In the olden days, we weren't allowed to get prize money, because we'd be pros, and pros weren't allowed into the olympics. So they gave us a per-diem, or an expense allowance. This was in the days when you could cash in a plane ticket. For example, to run in Chicago, from Madison, Nike would give us money for a plane ticket and tell us (wink wink) to buy a ticket. Nobody would fly. We'd all pile into old cars, as many of us into one car as possible.
In the late 80s, the Bank of Boulder struck a deal with TAC and we all got "Trust Accounts." Our prize money would be made out to our trust account. Or, our prize money check would be made out to our agent, who would deduct fees and then give us a check to our trust account. We would tell the trustee that we had training expenses. We wouldn't have to itemize the expenses. We'd just get a check. We could never take more than 90% of the funds out of the trust account.
I wasn't making any money after the early 90s, so I don't know what happened in the evolution of prize money, but it was my understanding that it was still, by some obscure act of congress that synchronized with the IAAF, USOC, IOC, etc., that "prize money" was actually "training expense funds."
Then, they said that actual pros could, in fact, compete in the olympics. Depending on your CPA, you might be able to just call it "training expense money," or you might have to call it "prize money."
Either way, good job.
As for my own running, I managed three miles twice this week. I'm still trying to recover from a groin/glute pull, from falling off my horse in the beginning of September.