I may not be popular in saying this, but if this woman was under cutting the rates of everyone else and potentially affecting my business due to tax fraud....yup, I'd report her in a heartbeat. I wouldn't give it a second thought. That's just not cool, in my opinion. If you're going to run a business and put yourself up as competition to all the other providers out there doing the job and everything associated with it properly, then play fair. Just my opinion.