Not really an AIBU... I have recently found out that BIL, who has been running two small businesses for a few years, has never registered these businesses, never had any books etc. It makes me so mad! We pay thousands in tax every year and to me it's stealing from society and making a mockery of those who do put in and contribute. If it wasn't someone so close, I'd have been on the phone to the tax people by now. I asked a close friend for their advice and it was to leave it, as what goes around comes around (e.g. he'll never be able to get a mortgage) and the tax office will catch up eventually. And I've nothing to gain from it, so I won't. WWYD? Honestly?