If you're a small business owner and you don't know what a profit and loss statement is, Dan Pilla says you need to fix that today. You can learn it in under 30 minutes. After 45 years of representing business owners in IRS audits, appeals, and Tax Court, Dan Pilla covers the 15 mistakes he's seen crush small businesses, from operating on net payroll to co-mingling personal and business funds to trusting the wrong person with your books.