Madali naman makita yan ng BIR pag di nala register as assets mo yan. I always transact with direct cash and full payment but I never forget to declare it sa BIR mahirap nang magsisi. If you earn by honest means then wala naman dapat ikatakot. Ngayon, if you're one of those guys who are "open minded" and buy kuxury cars pero ang tax na binabayaran mo lang ay 10% then alam mo na. ;)