“One taxpayer decided to write off the entire cost of his $50,000, multi-year globetrotting extravaganza, which included trips to Italy, France and Greece. And it worked, all because he wrote a book about his travels.
His tax preparer Jerry Lewin, managing director of accounting firm CBIZ MHM, said that because the book was actually published — even if it was by an obscure, low-budget publishing house — and because he made a small profit from it — only 20 books were sold — it counted as a business expense.”
From Yahoo! Finance